44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
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'use strict';
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const fs = require("fs")
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const path = require("path")
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const {isNode} = require("../exe-type")
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const whichOrUndefined = require("../which-or-undefined")
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/**
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* Intercepts processes spawned through a script with a shebang line.
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*
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* @param workingDir {string} Absolute system-dependent path to the directory containing the shim files.
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* @param options {import("../munge").InternalSpawnOptions} Original internal spawn options.
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* @return {import("../munge").InternalSpawnOptions} Updated internal spawn options.
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*/
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function mungeShebang(workingDir, options) {
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const resolved = whichOrUndefined(options.file)
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if (resolved === undefined) {
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return {...options}
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}
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const shebang = fs.readFileSync(resolved, 'utf8')
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const match = shebang.match(/^#!([^\r\n]+)/)
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if (!match) {
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return {...options} // not a shebang script, probably a binary
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}
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const shebangbin = match[1].split(' ')[0]
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const maybeNode = path.basename(shebangbin)
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if (!isNode(maybeNode)) {
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return {...options} // not a node shebang, leave untouched
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}
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const originalNode = shebangbin
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const file = shebangbin
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const args = [shebangbin, path.join(workingDir, maybeNode)]
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.concat(resolved)
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.concat(match[1].split(' ').slice(1))
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.concat(options.args.slice(1))
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return {...options, file, args, originalNode};
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}
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module.exports = mungeShebang
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