CyberShadow / aconfmgr / 470

Committed 26 Mar 2024 06:13PM UTC coverage: 80.669% (-13.0%) from 93.672%

Build # 470

Build Type

push

github

Committed by

CyberShadow-Renovate

Commit Message

Update dependency paru to v20240326042315

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60.16

/src/common.bash

# common.bash

# This file contains aconfmgr's common code, used by all commands.

####################################################################################################

# Globals

PACMAN=${PACMAN:-pacman}

output_dir="$tmp_dir"/output
system_dir="$tmp_dir"/system # Current system configuration, to be compared against the output directory

# The directory used for building AUR packages.
# When running as root, our "$tmp_dir" will be inaccessible to
# the user under which the building is performed ("nobody"),
# so we need a separate directory under this circumstance.
if [[ $EUID == 0 ]]
then
        aur_dir="$tmp_dir"-aur
else
        aur_dir="$tmp_dir"/aur
fi

default_file_mode=644

ANSI_clear_line=" [0K"
ANSI_color_R=" [1;31m"
ANSI_color_G=" [1;32m"
ANSI_color_Y=" [1;33m"
ANSI_color_B=" [1;34m"
ANSI_color_M=" [1;35m"
ANSI_color_C=" [1;36m"
ANSI_color_W=" [1;39m"
ANSI_reset=" [0m"

verbose=0
lint_config=false
umask $((666 - default_file_mode))

aconfmgr_action=
aconfmgr_action_args=()

####################################################################################################

# Defaults

# Initial ignore path list.
# Can be appended to using the IgnorePath helper.
ignore_paths=(
    '/dev'
    '/home'
    '/media'
    '/mnt'
    '/proc'
    '/root'
    '/run'
    '/sys'
    '/tmp'
    # '/var/.updated'
    '/var/cache'
    # '/var/lib'
    # '/var/lock'
    # '/var/log'
    # '/var/spool'
)

# These files must be installed before anything else,
# because they affect or are required for what follows.
# shellcheck disable=SC2034
priority_files=(
        /etc/passwd
        /etc/group
        /etc/pacman.conf
        /etc/pacman.d/mirrorlist
        /etc/makepkg.conf
)

# File content filters
# These are useful for files which contain some unpredictable element,
# such as a timestamp, which can't be considered as part of the system
# configuration, and can be safely omitted from the file.
# This is an associative array of patterns mapping to function
# names. The function is called with the file name as the only
# parameter, the file contents on its stdin, and is expected to
# provide the filtered contents on its stdout.
declare -A file_content_filters

# Some limits for common-sense warnings.
# Feel free to override these in your configuration.
warn_size_threshold=$((10*1024*1024)) # Warn on copying files bigger than this
warn_file_count_threshold=1000        # Warn on finding this many stray files
warn_tmp_df_threshold=$((1024*1024))  # Warn on error if free space in $tmp_dir is below this

makepkg_user=nobody # when running as root

####################################################################################################

function LogLeaveDirStats() {
        local dir="$1"
        Log 'Finalizing...\r'
        LogLeave 'Done (%s native packages, %s foreign packages, %s files).\n'        \
                         "$(Color G "$(wc -l < "$dir"/packages.txt)")"                                        \
                         "$(Color G "$(wc -l < "$dir"/foreign-packages.txt)")"                        \
                         "$(Color G "$(find "$dir"/files -not -type d | wc -l)")"
}

skip_config=n

# Run user configuration scripts, to collect desired state into #output_dir
function AconfCompileOutput() {
        LogEnter 'Compiling user configuration...\n'

        if [[ $skip_config == y ]]
        then
                LogLeave 'Skipped.\n'
                return
        fi

        # shellcheck disable=SC2174
        mkdir --mode=700 --parents "$tmp_dir"

        rm -rf "$output_dir"
        mkdir --parents "$output_dir"
        mkdir "$output_dir"/files
        touch "$output_dir"/packages.txt
        touch "$output_dir"/foreign-packages.txt
        touch "$output_dir"/file-props.txt
        touch "$output_dir"/warnings
        # shellcheck disable=SC2174
        mkdir --mode=700 --parents "$config_dir"

        # Configuration

        Log 'Using configuration in %s\n' "$(Color C "%q" "$config_dir")"

        typeset -ag ignore_packages=()
        typeset -ag ignore_foreign_packages=()
        typeset -Ag used_files

        local found=n
        local file
        for file in "$config_dir"/*.sh
        do
                if [[ -e "$file" ]]
                then
                        LogEnter 'Sourcing %s...\n' "$(Color C "%q" "$file")"
                        # shellcheck source=/dev/null
                        source "$file"
                        found=y
                        LogLeave ''
                fi
        done

        if $lint_config
        then
                # Check for unused files (files not referenced by the CopyFile
                # helper).
                # Only do this in the "check" action, as unused files do not
                # necessarily indicate a bug in the configuration - they may
                # simply be used under certain conditions.
                if [[ -d "$config_dir"/files ]]
                then
                        local line
                        find "$config_dir"/files -type f -print0 | \
                                while read -r -d $'\0' line
                                do
                                        local key=${line#"$config_dir"/files}
                                        if [[ -z "${used_files[$key]+x}" ]]
                                        then
                                                ConfigWarning 'Unused file: %s\n' \
                                                                          "$(Color C "%q" "$line")"
                                        fi
                                done
                fi
        fi

        if [[ $found == y ]]
        then
                LogLeaveDirStats "$output_dir"
        else
                LogLeave 'Done (configuration not found).\n'
        fi
}

skip_inspection=n
skip_checksums=n

# Given a list of paths to ignore (which can contain shell patterns),
# creates the list of arguments to give to 'find' to ignore them.
# The result is stored in the variable given by name as the first argument.
function AconfCreateFindIgnoreArgs() {
        # A correct and simple implementation of this function would just give
        # each argument as a parameter to find's -wholename, e.g. result in
        # (-wholename path1 -o -wholename path2 -o ... -o -wholename pathn)
        # However, this is painfully slow if the number of ignore patterns is large
        # Instead, this function (ab)uses the fact that if the number of patterns
        # given to GNU find is big, then as an implementation detail, using regular
        # expressions (-regex option and similar) scales much better than using
        # shell patterns (-wholename option and similar)
        local ignore_args_varname=$1
        local -n ignore_args_var=$ignore_args_varname
        shift
        local ignore_paths=("$@")

        # Divide the ignore paths as simple (contain obviously literal ASCII
        # characters or an asterisk wildcard) or complex (such as those using
        # character ranges, question mark wildcards, international characters, etc.)
        # Simple ignore paths are later going to be converted to regex,
        # complex ignore paths are passed literally to find's -wholename
        local simple_ignore_paths=()

        local ignore_path
        for ignore_path in "${ignore_paths[@]}"
        do
                # In this regular expression, we don't use ranges like "a-z", since this
                # can match non-ASCII characters. Also, the hyphen is at the end of the
                # regular expression to avoid it being interpreted as a range
                if [[ "$ignore_path" =~ [^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_/\ .*-] ]]
                then
                        ignore_args_var+=(-wholename "$ignore_path" -o)
                else
                        simple_ignore_paths+=("${ignore_path}")
                fi
        done

        if [ ${#simple_ignore_paths[@]} -ne 0 ]
        then
                # Converting the simple ignore paths to regular expressions just needs to
                # handle the asterisk wildcard, and escape a few characters
                local ignore_regexps
                echo -n "${simple_ignore_paths[*]}" | \
                        sed 's|[^*abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_/ ]|[&]|g; s|\*|.*|g' | \
                        mapfile -t ignore_regexps

                ignore_args_var+=(-regex "$( IFS='|' ; echo "${ignore_regexps[*]}" )" -o)
        fi

        ignore_args_var+=(-false)
}

# Collect system state into $system_dir
function AconfCompileSystem() {
        LogEnter 'Inspecting system state...\n'

        if [[ $skip_inspection == y ]]
        then
                LogLeave 'Skipped.\n'
                return
        fi

        # shellcheck disable=SC2174
        mkdir --mode=700 --parents "$tmp_dir"

        rm -rf "$system_dir"
        mkdir --parents "$system_dir"
        mkdir "$system_dir"/files
        touch "$system_dir"/file-props.txt
        touch "$system_dir"/orig-file-props.txt

        ### Packages

        LogEnter 'Querying package list...\n'
        ( "$PACMAN" --query --quiet --explicit --native  || true ) | sort | ( grep -vFxf <(PrintArray ignore_packages        ) || true ) > "$system_dir"/packages.txt
        ( "$PACMAN" --query --quiet --explicit --foreign || true ) | sort | ( grep -vFxf <(PrintArray ignore_foreign_packages) || true ) > "$system_dir"/foreign-packages.txt
        LogLeave

        ### Files

        local -a found_files
        found_files=()

        # whether the contents is different from the original
        local -A found_file_edited
        found_file_edited=()

        # Stray files

        local -a ignore_args
        AconfCreateFindIgnoreArgs ignore_args "${ignore_paths[@]}"

        LogEnter 'Enumerating owned files...\n'
        mkdir --parents "$tmp_dir"
        ( "$PACMAN" --query --list --quiet || true ) | sed 's#\/$##' | sort --unique > "$tmp_dir"/owned-files
        LogLeave

        LogEnter 'Searching for stray files...\n'

        local line
        local -Ag ignored_dirs

        AconfNeedProgram gawk gawk n

        # Progress display - only show file names once per second
        local progress_fd
        exec {progress_fd}> \
                 >( gawk '
BEGIN {
    RS = "\0";
    t = systime();
};
{
    u = systime();
    if (t != u) {
        t = u;
        printf "%s\0", $0;
        system(""); # https://unix.stackexchange.com/a/83853/4830
        }
}' | \
                                while read -r -d $'\0' line
                                do
                                        local path=${line:1}
                                        path=${path%/*} # Never show files, only directories
                                        while [[ ${#path} -gt 40 ]]
                                        do
                                                path=${path%/*}
                                        done
                                        Log 'Scanning %s...\r' "$(Color M "%q" "$path")"
                                done
                  )

        local stray_file_count=0
        (
                # NB: Regular expressions can be generated by AconfCreateFindIgnoreArgs
                #     The posix-extended regex type is used since it's easier to work
                #     with (e.g. no need to escape '|' alternations, parenthesis, etc.)
                sudo find /                                                                        \
                         -regextype posix-extended                                \
                         -not                                                                        \
                         \(                                                                                \
                                 \(                                                                        \
                                        "${ignore_args[@]}"                                \
                                \)                                                                        \
                                -printf 'I' -print0 -prune                        \
                        \)                                                                                \
                        -printf 'O' -print0                                                \
                        | tee /dev/fd/$progress_fd                                \
                        | ( grep                                                                \
                                        --null --null-data                                \
                                        --invert-match                                        \
                                        --fixed-strings                                        \
                                        --line-regexp                                        \
                                        --file                                                        \
                                        <( < "$tmp_dir"/owned-files                \
                                                 sed -e 's#^#O#'                        \
                                         )                                                                \
                                        || true )                                                \
        ) |                                                                                                \
                while read -r -d $'\0' line
                do
                        local file action
                        file=${line:1}
                        action=${line:0:1}

                        case "$action" in
                                O) # Stray file
                                        #echo "ignore_paths+='$file' # "
                                        if ((verbose))
                                        then
                                                Log '%s\r' "$(Color C "%q" "$file")"
                                        fi

                                        found_files+=("$file")
                                        found_file_edited[$file]=y
                                        stray_file_count=$((stray_file_count+1))

                                        if [[ $stray_file_count -eq $warn_file_count_threshold ]]
                                        then
                                                LogEnter '%s: reached %s stray files while in directory %s.\n' \
                                                        "$(Color Y "Warning")" \
                                                        "$(Color G "$stray_file_count")" \
                                                        "$(Color C "%q" "$(dirname "$file")")"
                                                LogLeave 'Perhaps add %s (or a parent directory) to configuration to ignore it.\n' \
                                                                 "$(Color Y "IgnorePath %q" "$(dirname "$file")"/'*')"
                                                warn_file_count_threshold=$((warn_file_count_threshold * 10))
                                        fi
                                        ;;
                                I) # Ignored

                                        # For convenience, we want to also ignore
                                        # directories which contain only ignored files.
                                        #
                                        # This is so that a rule such as:
                                        #
                                        # IgnorePath '/foo/bar/baz/*.log'
                                        #
                                        # does not cause `aconfmgr save` to still emit lines like
                                        #
                                        # CreateDir /foo/bar
                                        # CreateDir /foo/bar/baz
                                        #
                                        # However, we can't simply exclude parent dirs of
                                        # excluded files from the file list, as then they
                                        # will show up as missing in the diff against the
                                        # compiled configuration. So, later we remove
                                        # parent directories of any found un-ignored
                                        # files.

                                        local path="$file"
                                        while [[ -n "$path" ]]
                                        do
                                                ignored_dirs[$path]=y
                                                path=${path%/*}
                                        done
                                        ;;
                        esac
                done

        LogLeave 'Done (%s stray files).\n' "$(Color G %s $stray_file_count)"

        exec {progress_fd}<&-

        LogEnter 'Cleaning up ignored files'\'' directories...\n'

        local file
        for file in "${found_files[@]}"
        do
                if [[ -z "${ignored_dirs[$file]+x}" ]]
                then
                        local path="$file"
                        while [[ -n "$path" ]]
                        do
                                unset "ignored_dirs[\$path]"
                                path=${path%/*}
                        done
                fi
        done

        LogLeave

        # Modified files

        LogEnter 'Searching for modified files...\n'

        AconfNeedProgram paccheck pacutils n
        AconfNeedProgram unbuffer expect n
        local modified_file_count=0
        local -A saw_file

        # Tentative tracking of original file properties.
        # The canonical version is read from orig-file-props.txt in AconfAnalyzeFiles
        unset orig_file_props ; typeset -Ag orig_file_props

        : > "$tmp_dir"/file-owners

        local paccheck_opts=(unbuffer paccheck --files --file-properties --backup --noupgrade)
        if [[ $skip_checksums == n ]]
        then
                paccheck_opts+=(--md5sum)
        fi

        sudo sh -c "LC_ALL=C stdbuf -o0 $(printf ' %q' "${paccheck_opts[@]}") 2>&1 || true" | \
                while read -r line
                do
                        if [[ $line =~ ^(.*):\ \'(.*)\'\ (type|size|modification\ time|md5sum|UID|GID|permission|symlink\ target)\ mismatch\ \(expected\ (.*)\)$ ]]
                        then
                                local package="${BASH_REMATCH[1]}"
                                local file="${BASH_REMATCH[2]}"
                                local kind="${BASH_REMATCH[3]}"
                                local value="${BASH_REMATCH[4]}"

                                local ignored=n
                                local ignore_path
                                for ignore_path in "${ignore_paths[@]}"
                                do
                                        # shellcheck disable=SC2053
                                        if [[ "$file" == $ignore_path ]]
                                        then
                                                ignored=y
                                                break
                                        fi
                                done

                                if [[ $ignored == n ]]
                                then
                                        if [[ -z "${saw_file[$file]+x}" ]]
                                        then
                                                saw_file[$file]=y
                                                Log '%s: %s\n' "$(Color M "%q" "$package")" "$(Color C "%q" "$file")"
                                                found_files+=("$file")
                                                modified_file_count=$((modified_file_count+1))
                                        fi

                                        local prop
                                        case "$kind" in
                                                UID)
                                                        prop=owner
                                                        value=${value#*/}
                                                        ;;
                                                GID)
                                                        prop=group
                                                        value=${value#*/}
                                                        ;;
                                                permission)
                                                        prop=mode
                                                        ;;
                                                type|size|modification\ time|md5sum|symlink\ target)
                                                        prop=
                                                        found_file_edited[$file]=y
                                                        ;;
                                                *)
                                                        prop=
                                                        ;;
                                        esac

                                        if [[ -n "$prop" ]]
                                        then
                                                local key="$file:$prop"
                                                orig_file_props[$key]=$value

                                                printf '%s\t%s\t%q\n' "$prop" "$value" "$file" >> "$system_dir"/orig-file-props.txt
                                        fi
                                fi
                                printf '%s\0%s\0' "$file" "$package" >> "$tmp_dir"/file-owners
                        elif [[ $line =~ ^(.*):\ \'(.*)\'\ missing\ file$ ]]
                        then
                                local package="${BASH_REMATCH[1]}"
                                local file="${BASH_REMATCH[2]}"

                                local ignored=n
                                local ignore_path
                                for ignore_path in "${ignore_paths[@]}"
                                do
                                        # shellcheck disable=SC2053
                                        if [[ "$file" == $ignore_path ]]
                                        then
                                                ignored=y
                                                break
                                        fi
                                done

                                if [[ $ignored == y ]]
                                then
                                        continue
                                fi

                                Log '%s (missing)...\r' "$(Color M "%q" "$package")"
                                printf '%s\t%s\t%q\n' "deleted" "y" "$file" >> "$system_dir"/file-props.txt
                                printf '%s\0%s\0' "$file" "$package" >> "$tmp_dir"/file-owners
                        elif [[ $line =~ ^warning:\ (.*):\ \'(.*)\'\ read\ error\ \(No\ such\ file\ or\ directory\)$ ]]
                        then
                                local package="${BASH_REMATCH[1]}"
                                local file="${BASH_REMATCH[2]}"
                                # Ignore
                        elif [[ $line =~ ^(.*):\ all\ files\ match\ (database|mtree|mtree\ md5sums)$ ]]
                        then
                                local package="${BASH_REMATCH[1]}"
                                Log '%s...\r' "$(Color M "%q" "$package")"
                                #echo "Now at ${BASH_REMATCH[1]}"
                        else
                                Log 'Unknown paccheck output line: %s\n' "$(Color Y "%q" "$line")"
                        fi
                done
        LogLeave 'Done (%s modified files).\n' "$(Color G %s $modified_file_count)"

        LogEnter 'Reading file attributes...\n'

        typeset -a found_file_types found_file_sizes found_file_modes found_file_owners found_file_groups
        if [[ ${#found_files[*]} == 0 ]]
        then
                Log 'No files found, skipping.\n'
        else
                Log 'Reading file types...\n'  ; Print0Array found_files | sudo env LC_ALL=C xargs -0 stat --format=%F | mapfile -t  found_file_types
                Log 'Reading file sizes...\n'  ; Print0Array found_files | sudo env LC_ALL=C xargs -0 stat --format=%s | mapfile -t  found_file_sizes
                Log 'Reading file modes...\n'  ; Print0Array found_files | sudo env LC_ALL=C xargs -0 stat --format=%a | mapfile -t  found_file_modes
                Log 'Reading file owners...\n' ; Print0Array found_files | sudo env LC_ALL=C xargs -0 stat --format=%U | mapfile -t found_file_owners
                Log 'Reading file groups...\n' ; Print0Array found_files | sudo env LC_ALL=C xargs -0 stat --format=%G | mapfile -t found_file_groups
        fi

        LogLeave # Reading file attributes

        LogEnter 'Checking disk space...\n'
        local -i i
        local -i total_blocks=0
        local -i tmp_block_size tmp_blocks_free
        tmp_block_size=$(stat -f -c %S "$system_dir")
        tmp_blocks_free=$(stat -f -c %f "$system_dir")
        local tmp_fs_type
        tmp_fs_type=$(stat -f -c %T "$system_dir")
        if [[ "$tmp_fs_type" != "ramfs" ]]
        then
                for ((i=0; i<${#found_files[*]}; i++))
                do
                        local -i size="${found_file_sizes[$i]}"
                        local -i blocks=$(((size+tmp_block_size-1)/tmp_block_size)) # Count blocks
                        total_blocks+=$blocks
                        if (( total_blocks >= tmp_blocks_free ))
                        then
                                local file="${found_files[$i]}"
                                Log 'Copying file %s (%s bytes / %s blocks) to temporary storage would exhaust free space on %s (%s bytes / %s blocks).\n' \
                                        "$(Color C "%q" "$file")" "$(Color G "$size")" "$(Color G "$blocks")" \
                                        "$(Color C "%q" "$system_dir")" "$(Color G "$((tmp_blocks_free * tmp_block_size))")" "$(Color G "$tmp_blocks_free")"
                                Log 'Perhaps add %s (or a parent directory) to configuration to ignore it, or run with %s pointing at another location.\n' \
                                        "$(Color Y "IgnorePath %q" "$(dirname "$file")"/'*')" "$(Color Y "TMPDIR")"
                                FatalError 'Refusing to proceed.\n'
                        fi
                done
        fi
        LogLeave

        LogEnter 'Processing found files...\n'

        for ((i=0; i<${#found_files[*]}; i++))
        do
                Log '%s/%s...\r' "$(Color G "$i")" "$(Color G "${#found_files[*]}")"

                local  file="${found_files[$i]}"
                local  type="${found_file_types[$i]}"
                local  size="${found_file_sizes[$i]}"
                local  mode="${found_file_modes[$i]}"
                local owner="${found_file_owners[$i]}"
                local group="${found_file_groups[$i]}"

                if [[ "${ignored_dirs[$file]-n}" == y ]]
                then
                        continue
                fi

                if [[ -n "${found_file_edited[$file]+x}" ]]
                then
                        mkdir --parents "$(dirname "$system_dir"/files/"$file")"
                        if [[ "$type" == "symbolic link" ]]
                        then
                                ln -s -- "$(sudo readlink "$file")" "$system_dir"/files/"$file"
                        elif [[ "$type" == "regular file" || "$type" == "regular empty file" ]]
                        then
                                if [[ $size -gt $warn_size_threshold ]]
                                then
                                        Log '%s: copying large file %s (%s bytes). Add %s to configuration to ignore.\n' "$(Color Y "Warning")" "$(Color C "%q" "$file")" "$(Color G "$size")" "$(Color Y "IgnorePath %q" "$file")"
                                fi

                                local filter_pattern filter_func
                                unset filter_func
                                for filter_pattern in "${!file_content_filters[@]}"
                                do
                                        # shellcheck disable=SC2053
                                        if [[ "$file" == $filter_pattern ]]
                                        then
                                                filter_func=${file_content_filters[$filter_pattern]}
                                        fi
                                done

                                if [[ -v filter_func ]]
                                then
                                        sudo cat "$file" | "$filter_func" "$file" > "$system_dir"/files/"$file"
                                else
                                        # shellcheck disable=SC2024
                                        sudo cat "$file" > "$system_dir"/files/"$file"
                                fi
                        elif [[ "$type" == "directory" ]]
                        then
                                mkdir --parents "$system_dir"/files/"$file"
                        else
                                Log '%s: Skipping file %s with unknown type %s. Add %s to configuration to ignore.\n' "$(Color Y "Warning")" "$(Color C "%q" "$file")" "$(Color G "$type")" "$(Color Y "IgnorePath %q" "$file")"
                                continue
                        fi
                fi

                {
                        local prop
                        for prop in mode owner group
                        do
                                # Ignore mode "changes" in symbolic links
                                # If a file's type changes, a change in mode can be reported too.
                                # But, symbolic links cannot have a mode, so ignore this change.
                                if [[ "$type" == "symbolic link" && "$prop" == mode ]]
                                then
                                        continue
                                fi

                                local value
                                eval "value=\$$prop"

                                local default_value

                                if [[ $i -lt $stray_file_count ]]
                                then
                                        # For stray files, the default owner/group is root/root,
                                        # and the default mode depends on the type.
                                        # Let AconfDefaultFileProp get the correct default value for us.

                                        default_value=
                                else
                                        # For owned files, we assume that the defaults are the
                                        # files' current properties, unless paccheck said
                                        # otherwise.

                                        default_value=$value
                                fi

                                local orig_value
                                orig_value=$(AconfDefaultFileProp "$file" "$prop" "$type" "$default_value")

                                [[ "$value" == "$orig_value" ]] || printf '%s\t%s\t%q\n' "$prop" "$value" "$file"
                        done
                } >> "$system_dir"/file-props.txt
        done

        LogLeave # Processing found files

        LogLeaveDirStats "$system_dir" # Inspecting system state
}

####################################################################################################

typeset -A file_property_kind_exists

# Print to stdout the original/default value of the given file property.
# Uses orig_file_props entry if present.
function AconfDefaultFileProp() {
        local file=$1 # Absolute path to the file
        local prop=$2 # Name of the property (owner, group, or mode)
        local type="${3:-}" # Type of the file, as identified by `stat --format=%F`
        local default="${4:-}" # Default value, returned if we don't know the original file property.

        local key="$file:$prop"

        if [[ -n "${orig_file_props[$key]+x}" ]]
        then
                printf '%s' "${orig_file_props[$key]}"
                return
        fi

        if [[ -n "$default" ]]
        then
                printf '%s' "$default"
                return
        fi

        case "$prop" in
                mode)
                        if [[ -z "$type" ]]
                        then
                                type=$(sudo env LC_ALL=C stat --format=%F "$file")
                        fi

                        if [[ "$type" == "symbolic link" ]]
                        then
                                FatalError 'Symbolic links do not have a mode\n' # Bug
                        elif [[ "$type" == "directory" ]]
                        then
                                printf 755
                        else
                                printf '%s' "$default_file_mode"
                        fi
                        ;;
                owner|group)
                        printf 'root'
                        ;;
        esac
}

# Read a file-props.txt file into an associative array.
function AconfReadFileProps() {
        local filename="$1" # Path to file-props.txt to be read
        local varname="$2"  # Name of global associative array variable to read into

        local line
        while read -r line
        do
                if [[ $line =~ ^(.*)\        (.*)\        (.*)$ ]]
                then
                        local kind="${BASH_REMATCH[1]}"
                        local value="${BASH_REMATCH[2]}"
                        local file="${BASH_REMATCH[3]}"
                        file="$(eval "printf %s $file")" # Unescape

                        if [[ -z "$value" ]]
                        then
                                unset "${varname}[\$file:\$kind]"
                        else
                                eval "${varname}[\$file:\$kind]=\"\$value\""
                        fi

                        file_property_kind_exists[$kind]=y
                fi
        done < "$filename"
}

# Compare file properties.
function AconfCompareFileProps() {
        LogEnter 'Comparing file properties...\n'

        typeset -ag system_only_file_props=()
        typeset -ag changed_file_props=()
        typeset -ag config_only_file_props=()

        local key
        for key in "${!system_file_props[@]}"
        do
                if [[ -z "${output_file_props[$key]+x}" ]]
                then
                        system_only_file_props+=("$key")
                fi
        done

        for key in "${!system_file_props[@]}"
        do
                if [[ -n "${output_file_props[$key]+x}" && "${system_file_props[$key]}" != "${output_file_props[$key]}" ]]
                then
                        changed_file_props+=("$key")
                fi
        done

        for key in "${!output_file_props[@]}"
        do
                if [[ -z "${system_file_props[$key]+x}" ]]
                then
                        config_only_file_props+=("$key")
                fi
        done

        LogLeave
}

# Compare file information in $output_dir and $system_dir.
function AconfAnalyzeFiles() {

        #
        # Stray/modified files - diff
        #

        LogEnter 'Examining files...\n'

        LogEnter 'Loading data...\n'
        mkdir --parents "$tmp_dir"
        ( cd "$output_dir"/files && find . -mindepth 1 -print0 ) | cut --zero-terminated -c 2- | sort --zero-terminated > "$tmp_dir"/output-files
        ( cd "$system_dir"/files && find . -mindepth 1 -print0 ) | cut --zero-terminated -c 2- | sort --zero-terminated > "$tmp_dir"/system-files
        LogLeave

        Log 'Comparing file data...\n'

        typeset -ag system_only_files=()
        local file

        ( comm -13 --zero-terminated "$tmp_dir"/output-files "$tmp_dir"/system-files ) | \
                while read -r -d $'\0' file
                do
                        Log 'Only in system: %s\n' "$(Color C "%q" "$file")"
                        system_only_files+=("$file")
                done

        typeset -ag changed_files=()

        AconfNeedProgram diff diffutils n

        ( comm -12 --zero-terminated "$tmp_dir"/output-files "$tmp_dir"/system-files ) | \
                while read -r -d $'\0' file
                do
                        local output_type system_type
                        output_type=$(LC_ALL=C stat --format=%F "$output_dir"/files/"$file")
                        system_type=$(LC_ALL=C stat --format=%F "$system_dir"/files/"$file")

                        if [[ "$output_type" != "$system_type" ]]
                        then
                                Log 'Changed type (%s / %s): %s\n' \
                                        "$(Color Y "%q" "$output_type")" \
                                        "$(Color Y "%q" "$system_type")" \
                                        "$(Color C "%q" "$file")"
                                changed_files+=("$file")
                                continue
                        fi

                        if [[ "$output_type" == "directory" || "$system_type" == "directory" ]]
                        then
                                continue
                        fi

                        if ! diff --no-dereference --brief "$output_dir"/files/"$file" "$system_dir"/files/"$file" > /dev/null
                        then
                                Log 'Changed: %s\n' "$(Color C "%q" "$file")"
                                changed_files+=("$file")
                        fi
                done

        typeset -ag config_only_files=()

        ( comm -23 --zero-terminated "$tmp_dir"/output-files "$tmp_dir"/system-files ) | \
                while read -r -d $'\0' file
                do
                        Log 'Only in config: %s\n' "$(Color C "%q" "$file")"
                        config_only_files+=("$file")
                done

        LogLeave 'Done (%s only in system, %s changed, %s only in config).\n'        \
                         "$(Color G "${#system_only_files[@]}")"                                                \
                         "$(Color G "${#changed_files[@]}")"                                                        \
                         "$(Color G "${#config_only_files[@]}")"

        #
        # Modified file properties
        #

        LogEnter 'Examining file properties...\n'

        LogEnter 'Loading data...\n'
        unset orig_file_props # Also populated by AconfCompileSystem, so that it can be used by AconfDefaultFileProp
        typeset -Ag output_file_props ; AconfReadFileProps "$output_dir"/file-props.txt output_file_props
        typeset -Ag system_file_props ; AconfReadFileProps "$system_dir"/file-props.txt system_file_props
        typeset -Ag   orig_file_props ; AconfReadFileProps "$system_dir"/orig-file-props.txt orig_file_props
        LogLeave

        typeset -ag all_file_property_kinds
        all_file_property_kinds=("${!file_property_kind_exists[@]}")
        Print0Array all_file_property_kinds | sort --zero-terminated | mapfile -t -d $'\0' all_file_property_kinds

        AconfCompareFileProps

        LogLeave 'Done (%s only in system, %s changed, %s only in config).\n'        \
                         "$(Color G "${#system_only_file_props[@]}")"                                        \
                         "$(Color G "${#changed_file_props[@]}")"                                                \
                         "$(Color G "${#config_only_file_props[@]}")"
}

# The *_packages arrays are passed by name,
# so ShellCheck thinks the variables are unused:
# shellcheck disable=2034

# Prepare configuration and system state
function AconfCompile() {
        LogEnter 'Collecting data...\n'

        # Configuration

        AconfCompileOutput

        # System

        AconfCompileSystem

        # Vars

        < "$output_dir"/packages.txt         sort --unique | mapfile -t                   packages
        < "$system_dir"/packages.txt         sort --unique | mapfile -t         installed_packages

        < "$output_dir"/foreign-packages.txt sort --unique | mapfile -t           foreign_packages
        < "$system_dir"/foreign-packages.txt sort --unique | mapfile -t installed_foreign_packages

        AconfAnalyzeFiles

        LogLeave # Collecting data
}

####################################################################################################

pacman_opts=("$PACMAN")
aurman_opts=(aurman)
pacaur_opts=(pacaur)
yaourt_opts=(yaourt)
yay_opts=(yay)
paru_opts=(paru)
makepkg_opts=(makepkg)
diff_opts=(diff '--color=auto')

aur_helper=
aur_helpers=(aurman pacaur yaourt yay paru makepkg)

# Only aconfmgr can use makepkg under root
if [[ $EUID == 0 ]]
then
        aur_helper=makepkg
fi

function DetectAurHelper() {
        if [[ -n "$aur_helper" ]]
        then
                return
        fi

        LogEnter 'Detecting AUR helper...\n'

        local helper
        for helper in "${aur_helpers[@]}"
        do
                if hash "$helper" 2> /dev/null
                then
                        aur_helper=$helper
                        LogLeave '%s... Yes\n' "$(Color C %s "$helper")"
                        return
                fi
                Log '%s... No\n' "$(Color C %s "$helper")"
        done

        Log 'Can'\''t find even makepkg!?\n'
        Exit 1
}

base_devel_installed=n

function AconfMakePkg() {
        local install=true
        if [[ "$1" == --noinstall ]]
        then
                install=false
                shift
        fi

        local package="$1"
        local asdeps="${2:-false}"

        LogEnter 'Building foreign package %s from source.\n' "$(Color M %q "$package")"

        # shellcheck disable=SC2174
        mkdir --parents --mode=700 "$aur_dir"
        if [[ $EUID == 0 ]]
        then
                chown -R "$makepkg_user": "$aur_dir"
        fi

        local pkg_dir="$aur_dir"/"$package"
        Log 'Using directory %s.\n' "$(Color C %q "$pkg_dir")"

        rm -rf "$pkg_dir"
        mkdir --parents "$pkg_dir"

        # Needed to clone the AUR repo. Should be replaced with curl/tar.
        AconfNeedProgram git git n

        if [[ $base_devel_installed == n ]]
        then
                LogEnter 'Making sure the %s package is installed...\n' "$(Color M base-devel)"
                ParanoidConfirm ''
                if ! "$PACMAN" --query --quiet base-devel > /dev/null 2>&1
                then
                        AconfInstallNative base-devel
                fi

                LogLeave
                base_devel_installed=y
        fi

        LogEnter 'Cloning...\n'
        git clone "https://aur.archlinux.org/$package.git" "$pkg_dir"
        LogLeave

        if [[ ! -f "$pkg_dir"/PKGBUILD ]]
        then
                Log 'No package description file found!\n'

                if [[ "$package" == auracle-git ]]
                then
                        FatalError 'Failed to download aconfmgr dependency!\n'
                fi

                LogEnter 'Assuming this package is part of a package base:\n'

                LogEnter 'Retrieving package info...\n'
                AconfNeedProgram auracle auracle-git y
                local pkg_base
                pkg_base=$(auracle info --format '{pkgbase}' "$package")
                LogLeave 'Done, package base is %s.\n' "$(Color M %q "$pkg_base")"

                AconfMakePkg "$pkg_base" "$asdeps" # recurse
                LogLeave # Package base
                LogLeave # Package
                return
        fi

        AconfMakePkgDir "$package" "$asdeps" "$install" "$pkg_dir"
}

function AconfMakePkgDir() {
        local package=$1
        local asdeps=$2
        local install=$3
        local pkg_dir=$4

        local gnupg_home
        gnupg_home="$(realpath -m "$tmp_dir/gnupg")"

        local infofile infofilename
        for infofilename in .SRCINFO .AURINFO
        do
                infofile="$pkg_dir"/"$infofilename"
                if test -f "$infofile"
                then
                        LogEnter 'Checking dependencies...\n'

                        local depends missing_depends dependency arch
                        arch="$(uname -m)"
                        # Filter out packages from the same base
                        ( grep -E $'^\t(make|check)?depends(_'"$arch"')? = ' "$infofile" || true ) \
                                | sed 's/^.* = \([^<>=]*\)\([<>=].*\)\?$/\1/g' \
                                | ( grep -vFf <(( grep '^pkgname = ' "$infofile" || true) \
                                                                        | sed 's/^.* = \(.*\)$/\1/g' ) \
                                                || true ) \
                                | mapfile -t depends

                        if [[ ${#depends[@]} != 0 ]]
                        then
                                ( "$PACMAN" --deptest "${depends[@]}" || true ) | mapfile -t missing_depends
                                if [[ ${#missing_depends[@]} != 0 ]]
                                then
                                        for dependency in "${missing_depends[@]}"
                                        do
                                                LogEnter '%s:\n' "$(Color M %q "$dependency")"
                                                if "$PACMAN" --query --info "$dependency" > /dev/null 2>&1
                                                then
                                                        Log 'Already installed.\n' # Shouldn't happen, actually
                                                elif "$PACMAN" --sync --info "$dependency" > /dev/null 2>&1
                                                then
                                                        Log 'Installing from repositories...\n'
                                                        AconfInstallNative --asdeps "$dependency"
                                                        Log 'Installed.\n'
                                                else
                                                        local installed=false

                                                        # Check if this package is provided by something in pacman repos.
                                                        # `pacman -Si` will not give us that information,
                                                        # however, `pacman -S` still works.
                                                        AconfNeedProgram pacsift pacutils n
                                                        AconfNeedProgram unbuffer expect n
                                                        local providers
                                                        providers=$(unbuffer pacsift --sync --exact --satisfies="$dependency")
                                                        if [[ -n "$providers" ]]
                                                        then
                                                                Log 'Installing provider package from repositories...\n'
                                                                AconfInstallNative --asdeps "$dependency"
                                                                Log 'Installed.\n'
                                                                installed=true
                                                        fi

                                                        if ! $installed
                                                        then
                                                                Log 'Installing from AUR...\n'
                                                                AconfMakePkg "$dependency" true
                                                                Log 'Installed.\n'
                                                        fi
                                                fi

                                                LogLeave ''
                                        done
                                fi
                        fi

                        LogLeave

                        local keys
                        ( grep -E $'^\tvalidpgpkeys = ' "$infofile" || true ) | sed 's/^.* = \(.*\)$/\1/' | mapfile -t keys
                        if [[ ${#keys[@]} != 0 ]]
                        then
                                LogEnter 'Checking PGP keys...\n'

                                local key
                                for key in "${keys[@]}"
                                do
                                        export GNUPGHOME="$gnupg_home"

                                        if [[ ! -d "$GNUPGHOME" ]]
                                        then
                                                LogEnter 'Creating %s...\n' "$(Color C %s "$GNUPGHOME")"
                                                mkdir --parents "$GNUPGHOME"
                                                gpg --gen-key --batch <<EOF
Key-Type: DSA
Key-Length: 1024
Name-Real: aconfmgr
%no-protection
EOF
                                                LogLeave
                                        fi

                                        LogEnter 'Adding key %s...\n' "$(Color Y %q "$key")"
                                        #ParanoidConfirm ''

                                        local ok=false
                                        local keyserver
                                        for keyserver in keys.gnupg.net pgp.mit.edu pool.sks-keyservers.net keyserver.ubuntu.com # subkeys.pgp.net
                                        do
                                                LogEnter 'Trying keyserver %s...\n' "$(Color C %s "$keyserver")"
                                                if gpg --keyserver "$keyserver" --recv-key "$key"
                                                then
                                                        ok=true
                                                        LogLeave 'OK!\n'
                                                        break
                                                else
                                                        LogLeave 'Error...\n'
                                                fi
                                        done

                                        if ! $ok
                                        then
                                                FatalError 'No keyservers succeeded.\n'
                                        fi

                                        if [[ $EUID == 0 ]]
                                        then
                                                chmod 700 "$gnupg_home"
                                                chown -R "$makepkg_user": "$gnupg_home"
                                        fi

                                        LogLeave
                                done

                                LogLeave
                        fi
                fi
        done

        LogEnter 'Evaluating environment...\n'
        local path
        # shellcheck disable=SC2016
        path=$(env -i sh -c 'source /etc/profile 1>&2 ; printf -- %s "$PATH"')
        LogLeave

        LogEnter 'Building...\n'
        (
                cd "$pkg_dir"
                mkdir --parents home
                local args=(env -i "PATH=$path" "HOME=$PWD/home" "GNUPGHOME=$gnupg_home" "${makepkg_opts[@]}")

                if [[ $EUID == 0 ]]
                then
                        chown -R "$makepkg_user": .
                        su -s /bin/bash "$makepkg_user" -c "GNUPGHOME=$(realpath ../../gnupg) $(printf ' %q' "${args[@]}")" 1>&2

                        if $install
                        then
                                local pkglist
                                su -s /bin/bash "$makepkg_user" -c "GNUPGHOME=$(realpath ../../gnupg) $(printf ' %q' "${args[@]}" --packagelist)" | mapfile -t pkglist

                                if $asdeps
                                then
                                        "${pacman_opts[@]}" --upgrade --asdeps "${pkglist[@]}"
                                else
                                        "${pacman_opts[@]}" --upgrade "${pkglist[@]}"
                                fi
                        fi
                else
                        if $asdeps
                        then
                                args+=(--asdeps)
                        fi

                        if $install
                        then
                                args+=(--install)
                        fi

                        "${args[@]}" 1>&2
                fi
        )
        LogLeave

        LogLeave
}

function AconfInstallNative() {
        local asdeps=false asdeps_arr=()
        if [[ "$1" == --asdeps ]]
        then
                asdeps=true
                asdeps_arr=(--asdeps)
                shift
        fi

        local target_packages=("$@")
        if [[ $prompt_mode == never ]]
        then
                # Some prompts default to 'no'
                ( yes || true ) | sudo "${pacman_opts[@]}" --confirm --sync "${asdeps_arr[@]}" "${target_packages[@]}"
        else
                sudo "${pacman_opts[@]}" --sync "${asdeps_arr[@]}" "${target_packages[@]}"
        fi
}

function AconfInstallForeign() {
        local asdeps=false asdeps_arr=()
        if [[ "$1" == --asdeps ]]
        then
                asdeps=true
                asdeps_arr=(--asdeps)
                shift
        fi

        local target_packages=("$@")

        DetectAurHelper

        case "$aur_helper" in
                aurman)
                        RunExternal "${aurman_opts[@]}" --sync --aur "${asdeps_arr[@]}" "${target_packages[@]}"
                        ;;
                pacaur)
                        RunExternal "${pacaur_opts[@]}" --sync --aur "${asdeps_arr[@]}" "${target_packages[@]}"
                        ;;
                yaourt)
                        RunExternal "${yaourt_opts[@]}" --sync --aur "${asdeps_arr[@]}" "${target_packages[@]}"
                        ;;
                yay)
                        RunExternal "${yay_opts[@]}" --sync --aur "${asdeps_arr[@]}" "${target_packages[@]}"
                        ;;
                paru)
                        RunExternal "${paru_opts[@]}" --sync --aur "${asdeps_arr[@]}" "${target_packages[@]}"
                        ;;
                makepkg)
                        local package
                        for package in "${target_packages[@]}"
                        do
                                AconfMakePkg "$package" "$asdeps"
                        done
                        ;;
                *)
                        Log 'Error: unknown AUR helper %q\n' "$aur_helper"
                        false
                        ;;
        esac
}

function AconfNeedProgram() {
        local program="$1" # program that needs to be in PATH
        local package="$2" # package the program is available in
        local foreign="$3" # whether this is a foreign package

        if ! hash "$program" 2> /dev/null
        then
                if [[ $foreign == y ]]
                then
                        LogEnter 'Installing foreign dependency %s:\n' "$(Color M %q "$package")"
                        ParanoidConfirm ''
                        AconfInstallForeign --asdeps "$package"
                else
                        LogEnter 'Installing native dependency %s:\n' "$(Color M %q "$package")"
                        ParanoidConfirm ''
                        AconfInstallNative --asdeps "$package"
                fi
                LogLeave 'Installed.\n'
        fi
}

# Get the path to the package file (.pkg.tar.*) for the specified package.
# Download or build the package if necessary.
function AconfNeedPackageFile() {
        set -e
        local package="$1"

        local info foreign
        if info="$(LC_ALL=C "$PACMAN" --query --info "$package")"
        then
                if "$PACMAN" --query --quiet --foreign "$package" > /dev/null
                then
                        foreign=true
                else
                        foreign=false
                fi
        else
                if info="$(LC_ALL=C "$PACMAN" --sync --info "$package")"
                then
                        foreign=false
                else
                        foreign=true
                fi
        fi

        local version='' architecture='' filemask_precise filemask_any
        if [[ -n "$info" ]]
        then
                version="$(grep '^Version' <<< "$info" | sed 's/^.* : //g')"
                architecture="$(grep '^Architecture' <<< "$info" | sed 's/^.* : //g')"
                filemask_precise=$(printf "%q-%q-%q.pkg.*" "$package" "$version" "$architecture")
        fi
        filemask_any=$(printf "%q-*-*.pkg.*" "$package")

        # try without downloading first
        local downloaded
        for downloaded in false true
        do
                local precise
                for precise in true false
                do
                        # if we don't have the exact version, we can only do non-precise
                        if $precise && [[ -z "$version" ]]
                        then
                                continue
                        fi

                        local filemask
                        if $precise
                        then
                                filemask=$filemask_precise
                        else
                                filemask=$filemask_any
                        fi

                        local dirs=()
                        if $foreign
                        then
                                DetectAurHelper
                                local -A tried_helper=()

                                local helper
                                for helper in "$aur_helper" "${aur_helpers[@]}"
                                do
                                        if [[ ${tried_helper[$helper]+x} ]]
                                        then
                                                continue
                                        fi
                                        tried_helper[$helper]=y

                                        case "$helper" in
                                                aurman)
                                                        dirs+=("${XDG_CACHE_HOME:-$HOME/.cache}/aurman/$package")
                                                        ;;
                                                pacaur)
                                                        dirs+=("${XDG_CACHE_HOME:-$HOME/.cache}/pacaur/$package")
                                                        ;;
                                                yaourt)
                                                        # yaourt does not save .pkg.xz files
                                                        ;;
                                                yay)
                                                        dirs+=("${XDG_CACHE_HOME:-$HOME/.cache}/yay/$package")
                                                        ;;
                                                paru)
                                                        dirs+=("${XDG_CACHE_HOME:-$HOME/.cache}/paru/clone/$package")
                                                        ;;
                                                makepkg)
                                                        dirs+=("$aur_dir"/"$package")
                                                        ;;
                                                *)
                                                        Log 'Error: unknown AUR helper %q\n' "$aur_helper"
                                                        false
                                                        ;;
                                        esac
                                done
                        else
                                local dir
                                ( LC_ALL=C pacman --verbose 2>/dev/null || true ) \
                                        | sed -n 's/^Cache Dirs: \(.*\)$/\1/p' \
                                        | sed 's/  /\n/g' \
                                        | while read -r dir
                                do
                                        if [[ -n "$dir" ]]
                                        then
                                                dirs+=("$dir")
                                        fi
                                done
                        fi

                        local files=()
                        local dir
                        for dir in "${dirs[@]}"
                        do
                                if sudo test -d "$dir"
                                then
                                        sudo find "$dir" -type f -name "$filemask" -not -name '*.sig' -print0 | \
                                                while read -r -d $'\0' file
                                                do
                                                        files+=("$file")
                                                done
                                fi
                        done

                        local file
                        for file in "${files[@]}"
                        do
                                local correct
                                if $precise
                                then
                                        correct=true
                                else
                                        local pkgname
                                        pkgname=$(bsdtar -x --to-stdout --file "$file" .PKGINFO | \
                                                                  sed -n 's/^pkgname = \(.*\)$/\1/p')
                                        if [[ "$pkgname" == "$package" ]]
                                        then
                                                correct=true
                                        else
                                                correct=false
                                        fi
                                fi

                                if $correct
                                then
                                        printf '%s' "$file"
                                        return
                                fi
                        done
                done

                if $downloaded
                then
                        Log 'Unable to find package file for package %s!\n' "$(Color M %q "$package")"
                        Exit 1
                else
                        if $foreign
                        then
                                LogEnter 'Building foreign package %s\n' "$(Color M %q "$package")"
                                ParanoidConfirm ''

                                local helper
                                for helper in "$aur_helper" "${aur_helpers[@]}"
                                do
                                        case "$helper" in
                                                aurman)
                                                        # aurman does not have a --makepkg option
                                                        ;;
                                                pacaur)
                                                        if command -v "${pacaur_opts[0]}" > /dev/null
                                                        then
                                                                RunExternal "${pacaur_opts[@]}" --makepkg --aur --makepkg "$package" 1>&2
                                                                break
                                                        fi
                                                        ;;
                                                yaourt)
                                                        # yaourt does not save .pkg.xz files
                                                        continue
                                                        ;;
                                                yay)
                                                        # yay does not have a --makepkg option
                                                        continue
                                                        ;;
                                                paru)
                                                        # paru does not have a --makepkg option
                                                        continue
                                                        ;;
                                                makepkg)
                                                        AconfMakePkg --noinstall "$package"
                                                        break
                                                        ;;
                                                *)
                                                        Log 'Error: unknown AUR helper %q\n' "$aur_helper"
                                                        false
                                                        ;;
                                        esac
                                done

                                LogLeave
                        else
                                LogEnter "Downloading package %s (%s) to pacman's cache\\n" "$(Color M %q "$package")" "$(Color C %s "$filemask_precise")"
                                ParanoidConfirm ''
                                sudo "$PACMAN" --sync --download --nodeps --nodeps --noconfirm "$package" 1>&2
                                LogLeave
                        fi
                fi
        done
}

# Extract the original file from a package to stdout
function AconfGetPackageOriginalFile() {
        local package="$1" # Package to extract the file from
        local file="$2" # Absolute path to file in package

        local package_file
        package_file="$(AconfNeedPackageFile "$package")"

        local args=(bsdtar -x --to-stdout --file "$package_file" "${file/\//}")
        if [[ -r "$package_file" ]]
        then
                "${args[@]}"
        else
                sudo "${args[@]}"
        fi
}

function AconfRestoreFile() {
        local package=$1
        local file=$2

        local package_file
        package_file="$(AconfNeedPackageFile "$package")"

        # If we are restoring a directory, it may be non-empty.
        # Extract the object to a temporary location first.
        local tmp_base=${tmp_dir:?}/dir-props
        sudo rm -rf "$tmp_base"

        mkdir -p "$tmp_base"
        local tmp_file="$tmp_base""$file"
        sudo tar x --directory "$tmp_base" --file "$package_file" --no-recursion "${file/\//}"

        AconfReplace "$tmp_file" "$file"
        sudo rm -rf "$tmp_base"
}

# Move filesystem object at $1 to $2, replacing any existing one.
# Attempt to do so atomically, when possible.
# Do the right thing when filesystem objects differ, but never
# recursively remove directories (copy their attributes instead).
function AconfReplace() {
        local src=$1
        local dst=$2

        # Try direct mv first
        if ! sudo mv --no-target-directory "$src" "$dst" 2>/dev/null
        then
                # Direct mv failed - directory or object type mismatch
                if sudo rm --force --dir "$dst" 2>/dev/null
                then
                        # Deleted target successfully, now overwrite it
                        sudo mv --no-target-directory "$src" "$dst"
                else
                        # rm failed - likely a non-empty directory; copy
                        # attributes only
                        sudo chmod --reference="$src" "$dst"
                        sudo chown --reference="$src" "$dst"
                        sudo touch --reference="$src" "$dst"
                fi
        fi
}

####################################################################################################

prompt_mode=normal # never / normal / paranoid

function Confirm() {
        local detail_func="$1"

        if [[ $prompt_mode == never ]]
        then
                return
        fi

        while true
        do
                if [[ -n "$detail_func" ]]
                then
                        Log 'Proceed? [Y/n/d] '
                else
                        Log 'Proceed? [Y/n] '
                fi
                read -r -n 1 answer < /dev/tty
                echo 1>&2
                case "$answer" in
                        Y|y|'')
                                return
                                ;;
                        N|n)
                                Log '%s\n' "$(Color R "User abort")"
                                Exit 1
                                ;;
                        D|d)
                                $detail_func
                                continue
                                ;;
                        *)
                                continue
                                ;;
                esac
        done
}

function ParanoidConfirm() {
        if [[ $prompt_mode == paranoid ]]
        then
                Confirm "$@"
        fi
}

####################################################################################################

log_indent=:

function Log() {
        if [[ "$#" != 0 && -n "$1" ]]
        then
                local fmt="$1"
                shift

                if [[ -z $ANSI_clear_line ]]
                then
                        # Replace carriage returns in format string with newline
                        # when colors are disabled. This avoids systemd's journal
                        # from showing such lines as [# blob data].

                        fmt=${fmt//\\r/\\n} # Replace the '\r' sequence
                                            # (backslash-r) , not actual carriage
                                            # returns.
                fi

                printf "${ANSI_clear_line}${ANSI_color_B}%s ${ANSI_color_W}${fmt}${ANSI_reset}" "$log_indent" "$@" 1>&2
        fi
}

function LogEnter() {
        Log "$@"
        log_indent=$log_indent:
}

function LogLeave() {
        if [[ $# == 0 ]]
        then
                Log 'Done.\n'
        else
                Log "$@"
        fi

        log_indent=${log_indent::-1}
}

function ConfigWarning() {
        Log '%s: '"$1" "$(Color Y "Warning")" "${@:2}"
        printf W >> "$output_dir"/warnings
}

function FatalError() {
        Log "$@"
        false
        # if we're here, errexit is not set
        Log 'Continuing after error. This is a bug, please report it.\n'
        Exit 1
}

function Color() {
        local var="ANSI_color_$1"
        printf -- "%s" "${!var}"
        shift
        # shellcheck disable=2059
        printf -- "$@"
        printf -- "%s" "${ANSI_color_W}"
}

# The ANSI_color_* variables are looked up by name:
# shellcheck disable=2034
function DisableColor() {
        ANSI_color_R=
        ANSI_color_G=
        ANSI_color_Y=
        ANSI_color_B=
        ANSI_color_M=
        ANSI_color_C=
        ANSI_color_W=
        ANSI_reset=
        ANSI_clear_line=
}

####################################################################################################

function OnError() {
        trap '' EXIT ERR

        LogEnter '%s! Stack trace:\n' "$(Color R "Fatal error")"

        local frame=0 str
        while str=$(caller $frame)
        do
                if [[ $str =~ ^([^\ ]*)\ ([^\ ]*)\ (.*)$ ]]
                then
                        Log '%s:%s [%s]\n' "$(Color C "%q" "${BASH_REMATCH[3]}")" "$(Color G "%q" "${BASH_REMATCH[1]}")" "$(Color Y "%q" "${BASH_REMATCH[2]}")"
                else
                        Log '%s\n' "$str"
                fi

                frame=$((frame+1))
        done

        LogLeave ''

        if [[ -d "$tmp_dir" ]]
        then
                local df dir
                df=$(($(stat -f --format="%a*%S" "$tmp_dir")))
                if ! dir="$(realpath "$(dirname "$tmp_dir")" 2> /dev/null)"
                then
                        dir="$(dirname "$tmp_dir")"
                fi
                if [[ $df -lt $warn_tmp_df_threshold ]]
                then
                        LogEnter 'Probable cause: low disk space (%s bytes) in %s. Suggestions:\n' "$(Color G %s "$df")" "$(Color C %q "$dir")"
                        Log '- Ignore more files and directories using %s directives;\n' "$(Color Y IgnorePath)"
                        Log '- Free up more space in %s;\n' "$(Color C %q "$dir")"
                        Log '- Set %s to another location before invoking %s.\n' "$(Color Y \$TMPDIR)" "$(Color Y aconfmgr)"
                        LogLeave ''
                fi
        fi

        # Ensure complete abort when inside a string expansion
        exit 1
}
trap OnError EXIT ERR

function Exit() {
        trap '' EXIT ERR
        exit "${1:-0}"
}

####################################################################################################

# Print an array, one element per line (assuming IFS starts with \n).
function PrintArray() {
        local name="$1" # Name of the global variable containing the array
        local size

        size="$(eval "echo \${#${name}""[*]}")"
        if [[ $size != 0 ]]
        then
                eval "echo \"\${${name}[*]}\""
        fi
}

# Ditto, but terminate elements with a NUL.
function Print0Array() {
        local name="$1" # Name of the global variable containing the array

        eval "$(cat <<EOF
        if [[ \${#${name}[*]} != 0 ]]
        then
                local item
                for item in "\${${name}[@]}"
                do
                        printf '%s\\0' "\$item"
                done
        fi
EOF
)"
}

# Ditto, but shell-escape array elements.
function PrintQArray() {
        local name="$1" # Name of the global variable containing the array
        local size

        size="$(eval "echo \${#${name}""[*]}")"
        if [[ $size != 0 ]]
        then
                eval "printf -- %q \"\${${name}[0]}\""
                if [[ $size -gt 1 ]]
                then
                        eval "printf -- ' %q' \"\${${name}[@]:1}\""
                fi
        fi
}

if [[ $EUID == 0 ]]
then
        function sudo() { "$@" ; }
fi

# Run external bash script.
# No-op, except when running under the test suite with bashcov,
# in which case it does not propagate bashcov to the invoked script.
# Unlike `env -i`, does not nuke the environment.
function RunExternal() {
        env -u SHELLOPTS -u PS4 -u SHLVL -u BASH_XTRACEFD "$@"
}

# cat a file; if it's not readable, cat via sudo.
function SuperCat() {
        local file="$1"

        if [[ -r "$1" ]]
        then
                cat "$1"
        else
                sudo cat "$1"
        fi
}

if ! ( empty_array=() ; : "${empty_array[@]}" )
then
        # Old bash versions treat substitution of an empty array
        # synonymous with substituting an unset variable, signaling an
        # error in -u mode and stopping the script in -e mode. We
        # generally want both of these enabled to catch bugs early and
        # fail fast, but making every array substitution conditional on
        # whether it is empty or not is unreasonably onerous, so just
        # disable those checks in old bash versions - it is then up to the
        # test suite ran against newer bash versions to ensure code
        # correctness.

        Log '%s: Old bash detected, disabling unset variable checking.\n' "$(Color Y "Warning")"
        set +u
fi

: # include in coverage

CyberShadow / aconfmgr / 470

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