10947034918

Committed 19 Sep 2024 06:28PM UTC coverage: 92.72% (-0.02%) from 92.742%

Build # 10947034918

Build Type

push

github

Committed by

mxcl

Commit Message

Pass `--unstable-process`

Fixes #1038

Run Details

397 of 427 branches covered (92.97%)

1488 of 1606 relevant lines covered (92.65%)

162.65 hits per line

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96.51

/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 = (() => {
    let tries = 10;
    while (true) {
      const errno = _internals.execve(
        Deno.UnsafePointer.of(path),
        Deno.UnsafePointer.of(argv),
        Deno.UnsafePointer.of(envp)
      );
      if (!tries--) return errno;
      // 11 = EAGAIN = Try again
      if (errno == 11) continue;
      return errno;
    }
  })();

  switch (errno) {
    case 2:   //ENOENT:
    case 316: //FIXME ALERT! ALERT! BUG! SOMETHING IS WRONG WITH OUR USE OR ERRNO AND THIS SOMETIMES RESULTS, USUALLY ON MACOS :/
      // 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:
      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	2,166✔
10	}	2,166✔
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 = (() => {	24✔
19	let tries = 10;	42✔
20	while (true) {	42✔
21	const errno = _internals.execve(	42✔
22	Deno.UnsafePointer.of(path),	42✔
23	Deno.UnsafePointer.of(argv),	42✔
24	Deno.UnsafePointer.of(envp)	42✔
25	);
26	if (!tries--) return errno;	×
27	// 11 = EAGAIN = Try again	42✔
28	if (errno == 11) continue;	×
29	return errno;	42✔
30	}	42✔
31	})();	24✔
32
33	switch (errno) {	24✔
34	case 2: //ENOENT:	24✔
35	case 316: //FIXME ALERT! ALERT! BUG! SOMETHING IS WRONG WITH OUR USE OR ERRNO AND THIS SOMETIMES RESULTS, USUALLY ON MACOS :/	24✔
36	// yes: strange behavior from execve here indeed	32✔
37	if (parse_Path(args[0])?.exists()) {	32✔
38	throw new Deno.errors.PermissionDenied()	36✔
39	} else {	36✔
40	throw new Deno.errors.NotFound()	36✔
41	}	36✔
42	case 13:	24✔
43	throw new Deno.errors.PermissionDenied()	26✔
44	case 63: //ENAMETOOLONG:	12✔
45	case 7: //E2BIG:	12✔
46	case 14: //EFAULT:	12✔
47	case 5: //EIO:	12✔
48	case 62: //ELOOP:	12✔
49	case 8: //ENOEXEC:	12✔
50	case 12: //ENOMEM:	12✔
51	case 20: //ENOTDIR:	12✔
52	case 26: //ETXTBSY:	12✔
53	throw new PkgxError(`execve (${errno})`)	13✔
54	}	24✔
55
56	throw new ProgrammerError(`execve (${errno})`)	31✔
57	}	24✔
58
59	export function parse_Path(input: string) {	6✔
60	const p = Path.abs(input)	14✔
61	if (p) return p	14✔
62	try {	18✔
63	return _internals.getcwd().join(input)	18✔
64	} catch {	14✔
65	return	16✔
66	}	16✔
67	}	14✔
68
69	function find_in_PATH(cmd: string[], PATH: string \| undefined, HOME: Path \| undefined) {	24✔
70	if (cmd[0].startsWith("/")) {	24✔
71	return	30✔
72	}	30✔
73	if (cmd[0].includes("/")) {	24✔
74	cmd[0] = _internals.getcwd().join(cmd[0]).string	26✔
75	return	26✔
76	}	26✔
77
78	PATH ??= "/usr/bin:/bin" // see manpage for execvp(3)	34✔
79
80	for (const part of PATH.split(':')) {	24✔
81	const path = (() => {	192✔
82	if (part == '.') return _internals.getcwd()	360✔
83	if (part == '~') return HOME	360✔
84	if (part.startsWith('~/')) return HOME?.join(part.slice(2))	360✔
85	//FIXME: not handled: ~user/...	522✔
86	return new Path(part)	522✔
87	})()?.join(cmd[0])	192✔
88	if (path?.isExecutableFile()) {	192✔
89	cmd[0] = path.string	194✔
90	return	194✔
91	}	194✔
92	}	192✔
93	}	24✔
94
95
96	////// COPY PASTA	2✔
97	// actually minor mods to add trailing null	2✔
98	// https://github.com/aapoalas/libclang_deno/blob/main/lib/utils.ts	2✔
99
100	const ENCODER = new TextEncoder();	6✔
101
102	export class CStringArray extends Uint8Array {	6✔
103	constructor(strings: string[]) {	6✔
104	let stringsLength = 0;	42✔
105	for (const string of strings) {	42✔
106	// maximum bytes for a utf8 string is 4×length	2,281✔
107	stringsLength += string.length * 4 + 1;	2,281✔
108	}	2,281✔
109	super(8 * (strings.length + 1) + stringsLength);	42✔
110	const pointerBuffer = new BigUint64Array(this.buffer, 0, strings.length + 1);	42✔
111	const stringsBuffer = new Uint8Array(this.buffer).subarray(	42✔
112	(strings.length + 1) * 8,	42✔
113	);
114	const basePointer = BigInt(	42✔
115	Deno.UnsafePointer.value(Deno.UnsafePointer.of(stringsBuffer)),	42✔
116	);
117	let index = 0;	42✔
118	let offset = 0;	42✔
119	for (const string of strings) {	42✔
120	const start = offset;	2,281✔
121	const result = ENCODER.encodeInto(	2,281✔
122	string,	2,281✔
123	stringsBuffer.subarray(start),	2,281✔
124	);
125	offset = start + result.written + 1; // Leave null byte	2,281✔
126	pointerBuffer[index++] = basePointer + BigInt(start);	2,281✔
127	}	2,281✔
128	}	42✔
129	}	6✔
130
131	export const cstr = (string: string): Uint8Array =>	6✔
132	ENCODER.encode(`${string}\0`);	6✔
133
134	function execve(arg0: Deno.PointerValue, args: Deno.PointerValue, env: Deno.PointerValue) {	18✔
135	const filename = host().platform == 'darwin' ? '/usr/lib/libSystem.dylib' : 'libc.so.6'	×
136
137	const libc = Deno.dlopen(	18✔
138	filename, {	18✔
139	execve: {	18✔
140	parameters: ["pointer", "pointer", "pointer"],	90✔
141	result: "i32"	18✔
142	},	18✔
143	errno: {	18✔
144	type: "i32"	18✔
145	}	18✔
146	}	18✔
147	)
148
149	try {	18✔
150	libc.symbols.execve(arg0, args, env)	18✔
151	return libc.symbols.errno	18✔
152	} finally {	18✔
153	libc.close()	18✔
154	}	18✔
155	}	18✔
156
157	export const _internals = {	6✔
158	execve,	6✔
159	getcwd: Path.cwd	6✔
160	}	6✔

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