// make sure that bins are executable, and that they don't have
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// windows line-endings on the hashbang line.
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const {
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chmod,
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open,
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readFile,
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} = require('fs/promises')
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const execMode = 0o777 & (~process.umask())
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const writeFileAtomic = require('write-file-atomic')
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const isWindowsHashBang = buf =>
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buf[0] === '#'.charCodeAt(0) &&
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buf[1] === '!'.charCodeAt(0) &&
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/^#![^\n]+\r\n/.test(buf.toString())
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const isWindowsHashbangFile = file => {
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const FALSE = () => false
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return open(file, 'r').then(fh => {
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const buf = Buffer.alloc(2048)
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return fh.read(buf, 0, 2048, 0)
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.then(
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() => {
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const isWHB = isWindowsHashBang(buf)
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return fh.close().then(() => isWHB, () => isWHB)
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},
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// don't leak FD if read() fails
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() => fh.close().then(FALSE, FALSE)
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)
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}, FALSE)
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}
|
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const dos2Unix = file =>
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readFile(file, 'utf8').then(content =>
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writeFileAtomic(file, content.replace(/^(#![^\n]+)\r\n/, '$1\n')))
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const fixBin = (file, mode = execMode) => chmod(file, mode)
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.then(() => isWindowsHashbangFile(file))
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.then(isWHB => isWHB ? dos2Unix(file) : null)
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module.exports = fixBin
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