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