6916159303

Committed 18 Nov 2023 08:36PM UTC coverage: 97.388% (-0.003%) from 97.391%

Build # 6916159303

Build Type

push

github

Committed by

mxcl

Commit Message

warn if ~/.local/bin is not in PATH after install

Run Details

401 of 420 branches covered (0.0%)

1426 of 1456 relevant lines covered (97.94%)

138.69 hits per line

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98.76

/src/utils/execve.ts

import { ProgrammerError } from "./error.ts"
import { utils, Path, PkgxError } from "pkgx"
const { host } = utils

export default function({cmd: args, env}: {cmd: string[], env: Record<string, string>}): never {
  /// we need to forward any other env, some vars like HOME are super important
  /// but otherwise the user has set stuff so we should use it
  for (const [key, value] of Object.entries(Deno.env.toObject())) {
    env[key] ??= value
  }

  find_in_PATH(args, env.PATH, Path.abs(env.HOME))

  const path = cstr(args[0])
  const argv = new CStringArray(args)
  const envp = new CStringArray(Object.entries(env).map(([key, value]) => `${key}=${value}`))

  const errno = _internals.execve(
    Deno.UnsafePointer.of(path),
    Deno.UnsafePointer.of(argv),
    Deno.UnsafePointer.of(envp))

  switch (errno) {
    case 2:  //ENOENT:
      // yes: strange behavior from execve here indeed
      if (parse_Path(args[0])?.exists()) {
        throw new Deno.errors.PermissionDenied()
      } else {
        throw new Deno.errors.NotFound()
      }
    case 13:
    case 316:  //FIXME ALERT! ALERT! BUG! SOMETHING IS WRONG WITH OUR USE OR ERRNO AND THIS SOMETIMES RESULTS :/
      throw new Deno.errors.PermissionDenied()
    case 63: //ENAMETOOLONG:
    case 7:  //E2BIG:
    case 14: //EFAULT:
    case 5:  //EIO:
    case 62: //ELOOP:
    case 8:  //ENOEXEC:
    case 12: //ENOMEM:
    case 20: //ENOTDIR:
    case 26: //ETXTBSY:
      throw new PkgxError(`execve (${errno})`)
  }

  throw new ProgrammerError(`execve (${errno})`)
}

export function parse_Path(input: string) {
  const p = Path.abs(input)
  if (p) return p
  try {
    return _internals.getcwd().join(input)
  } catch {
    return
  }
}

function find_in_PATH(cmd: string[], PATH: string | undefined, HOME: Path | undefined) {
  if (cmd[0].startsWith("/")) {
    return
  }
  if (cmd[0].includes("/")) {
    cmd[0] = _internals.getcwd().join(cmd[0]).string
    return
  }

  PATH ??= "/usr/bin:/bin"  // see manpage for execvp(3)

  for (const part of PATH.split(':')) {
    const path = (() => {
      if (part == '.') return _internals.getcwd()
      if (part == '~') return HOME
      if (part.startsWith('~/')) return HOME?.join(part.slice(2))
      //FIXME: not handled: ~user/...
      return new Path(part)
    })()?.join(cmd[0])
    if (path?.isExecutableFile()) {
      cmd[0] = path.string
      return
    }
  }
}


////// COPY PASTA
// actually minor mods to add trailing null
// https://github.com/aapoalas/libclang_deno/blob/main/lib/utils.ts

const ENCODER = new TextEncoder();

export class CStringArray extends Uint8Array {
  constructor(strings: string[]) {
    let stringsLength = 0;
    for (const string of strings) {
      // maximum bytes for a utf8 string is 4×length
      stringsLength += string.length * 4 + 1;
    }
    super(8 * (strings.length + 1) + stringsLength);
    const pointerBuffer = new BigUint64Array(this.buffer, 0, strings.length + 1);
    const stringsBuffer = new Uint8Array(this.buffer).subarray(
      (strings.length + 1) * 8,
    );
    const basePointer = BigInt(
      Deno.UnsafePointer.value(Deno.UnsafePointer.of(stringsBuffer)),
    );
    let index = 0;
    let offset = 0;
    for (const string of strings) {
      const start = offset;
      const result = ENCODER.encodeInto(
        string,
        stringsBuffer.subarray(start),
      );
      offset = start + result.written + 1; // Leave null byte
      pointerBuffer[index++] = basePointer + BigInt(start);
    }
  }
}

export const cstr = (string: string): Uint8Array =>
  ENCODER.encode(`${string}\0`);

function execve(arg0: Deno.PointerValue, args: Deno.PointerValue, env: Deno.PointerValue) {
  const filename = host().platform == 'darwin' ? '/usr/lib/libSystem.dylib' : 'libc.so.6'

  const libc = Deno.dlopen(
    filename, {
      execve: {
        parameters: ["pointer", "pointer", "pointer"],
        result: "i32"
      },
      errno: {
        type: "i32"
      }
    }
  )

  try {
    libc.symbols.execve(arg0, args, env)
    return libc.symbols.errno
  } finally {
    libc.close()
  }
}

export const _internals = {
  execve,
  getcwd: Path.cwd
}

1	import { ProgrammerError } from "./error.ts"	6✔
2	import { utils, Path, PkgxError } from "pkgx"	6✔
3	const { host } = utils	6✔
4
5	export default function({cmd: args, env}: {cmd: string[], env: Record<string, string>}): never {	6✔
6	/// we need to forward any other env, some vars like HOME are super important	24✔
7	/// but otherwise the user has set stuff so we should use it	24✔
8	for (const [key, value] of Object.entries(Deno.env.toObject())) {	24✔
9	env[key] ??= value	2,121✔
10	}	2,121✔
11
12	find_in_PATH(args, env.PATH, Path.abs(env.HOME))	24✔
13
14	const path = cstr(args[0])	24✔
15	const argv = new CStringArray(args)	24✔
16	const envp = new CStringArray(Object.entries(env).map(([key, value]) => `${key}=${value}`))	24✔
17
18	const errno = _internals.execve(	24✔
19	Deno.UnsafePointer.of(path),	24✔
20	Deno.UnsafePointer.of(argv),	24✔
21	Deno.UnsafePointer.of(envp))	24✔
22
23	switch (errno) {	24✔
24	case 2: //ENOENT:	24✔
25	// yes: strange behavior from execve here indeed	32✔
26	if (parse_Path(args[0])?.exists()) {	32✔
27	throw new Deno.errors.PermissionDenied()	36✔
28	} else {	36✔
29	throw new Deno.errors.NotFound()	36✔
30	}	36✔
31	case 13:	12✔
32	case 316: //FIXME ALERT! ALERT! BUG! SOMETHING IS WRONG WITH OUR USE OR ERRNO AND THIS SOMETIMES RESULTS :/	24✔
33	throw new Deno.errors.PermissionDenied()	26✔
34	case 63: //ENAMETOOLONG:	12✔
35	case 7: //E2BIG:	12✔
36	case 14: //EFAULT:	12✔
37	case 5: //EIO:	12✔
38	case 62: //ELOOP:	12✔
39	case 8: //ENOEXEC:	12✔
40	case 12: //ENOMEM:	12✔
41	case 20: //ENOTDIR:	12✔
42	case 26: //ETXTBSY:	12✔
43	throw new PkgxError(`execve (${errno})`)	13✔
44	}	24✔
45
46	throw new ProgrammerError(`execve (${errno})`)	31✔
47	}	24✔
48
49	export function parse_Path(input: string) {	6✔
50	const p = Path.abs(input)	14✔
51	if (p) return p	14✔
52	try {	18✔
53	return _internals.getcwd().join(input)	18✔
54	} catch {	14✔
55	return	16✔
56	}	16✔
57	}	14✔
58
59	function find_in_PATH(cmd: string[], PATH: string \| undefined, HOME: Path \| undefined) {	24✔
60	if (cmd[0].startsWith("/")) {	24✔
61	return	30✔
62	}	30✔
63	if (cmd[0].includes("/")) {	24✔
64	cmd[0] = _internals.getcwd().join(cmd[0]).string	26✔
65	return	26✔
66	}	26✔
67
68	PATH ??= "/usr/bin:/bin" // see manpage for execvp(3)	34✔
69
70	for (const part of PATH.split(':')) {	24✔
71	const path = (() => {	192✔
72	if (part == '.') return _internals.getcwd()	360✔
73	if (part == '~') return HOME	360✔
74	if (part.startsWith('~/')) return HOME?.join(part.slice(2))	360✔
75	//FIXME: not handled: ~user/...	522✔
76	return new Path(part)	522✔
77	})()?.join(cmd[0])	192✔
78	if (path?.isExecutableFile()) {	192✔
79	cmd[0] = path.string	194✔
80	return	194✔
81	}	194✔
82	}	192✔
83	}	24✔
84
85
86	////// COPY PASTA	2✔
87	// actually minor mods to add trailing null	2✔
88	// https://github.com/aapoalas/libclang_deno/blob/main/lib/utils.ts	2✔
89
90	const ENCODER = new TextEncoder();	6✔
91
92	export class CStringArray extends Uint8Array {	6✔
93	constructor(strings: string[]) {	6✔
94	let stringsLength = 0;	42✔
95	for (const string of strings) {	42✔
96	// maximum bytes for a utf8 string is 4×length	2,243✔
97	stringsLength += string.length * 4 + 1;	2,243✔
98	}	2,243✔
99	super(8 * (strings.length + 1) + stringsLength);	42✔
100	const pointerBuffer = new BigUint64Array(this.buffer, 0, strings.length + 1);	42✔
101	const stringsBuffer = new Uint8Array(this.buffer).subarray(	42✔
102	(strings.length + 1) * 8,	42✔
103	);
104	const basePointer = BigInt(	42✔
105	Deno.UnsafePointer.value(Deno.UnsafePointer.of(stringsBuffer)),	42✔
106	);
107	let index = 0;	42✔
108	let offset = 0;	42✔
109	for (const string of strings) {	42✔
110	const start = offset;	2,243✔
111	const result = ENCODER.encodeInto(	2,243✔
112	string,	2,243✔
113	stringsBuffer.subarray(start),	2,243✔
114	);
115	offset = start + result.written + 1; // Leave null byte	2,243✔
116	pointerBuffer[index++] = basePointer + BigInt(start);	2,243✔
117	}	2,243✔
118	}	42✔
119	}	6✔
120
121	export const cstr = (string: string): Uint8Array =>	6✔
122	ENCODER.encode(`${string}\0`);	6✔
123
124	function execve(arg0: Deno.PointerValue, args: Deno.PointerValue, env: Deno.PointerValue) {	18✔
125	const filename = host().platform == 'darwin' ? '/usr/lib/libSystem.dylib' : 'libc.so.6'	×
126
127	const libc = Deno.dlopen(	18✔
128	filename, {	18✔
129	execve: {	18✔
130	parameters: ["pointer", "pointer", "pointer"],	90✔
131	result: "i32"	18✔
132	},	18✔
133	errno: {	18✔
134	type: "i32"	18✔
135	}	18✔
136	}	18✔
137	)
138
139	try {	18✔
140	libc.symbols.execve(arg0, args, env)	18✔
141	return libc.symbols.errno	18✔
142	} finally {	18✔
143	libc.close()	18✔
144	}	18✔
145	}	18✔
146
147	export const _internals = {	6✔
148	execve,	6✔
149	getcwd: Path.cwd	6✔
150	}	6✔

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