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// check to see if a bin is allowed to be overwritten
// either rejects or resolves to nothing. return value not relevant.
const isWindows = require('./is-windows.js')
const binTarget = require('./bin-target.js')
const {resolve, dirname} = require('path')
const readCmdShim = require('read-cmd-shim')
const fs = require('fs')
const {promisify} = require('util')
const readlink = promisify(fs.readlink)
const checkBin = async ({bin, path, top, global, force}) => {
// always ok to clobber when forced
// always ok to clobber local bins, or when forced
if (force || !global || !top)
return
// ok, need to make sure, then
const target = resolve(binTarget({path, top}), bin)
path = resolve(path)
return isWindows ? checkShim({target, path}) : checkLink({target, path})
}
// only enoent is allowed. anything else is a problem.
const handleReadLinkError = async ({er, target}) =>
er.code === 'ENOENT' ? null
: failEEXIST({target})
const checkLink = async ({target, path}) => {
const current = await readlink(target)
.catch(er => handleReadLinkError({er, target}))
if (!current)
return
const resolved = resolve(dirname(target), current)
if (resolved.toLowerCase().indexOf(path.toLowerCase()) !== 0)
return failEEXIST({target})
}
const handleReadCmdShimError = ({er, target}) =>
er.code === 'ENOENT' ? null
: failEEXIST({target})
const failEEXIST = ({target}) =>
Promise.reject(Object.assign(new Error('EEXIST: file already exists'), {
path: target,
code: 'EEXIST',
}))
const checkShim = async ({target, path}) => {
const shims = [
target,
target + '.cmd',
target + '.ps1',
]
await Promise.all(shims.map(async target => {
const current = await readCmdShim(target)
.catch(er => handleReadCmdShimError({er, target}))
if (!current)
return
const resolved = resolve(dirname(target), current.replace(/\\/g, '/'))
if (resolved.toLowerCase().indexOf(path.toLowerCase()) !== 0)
return failEEXIST({target})
}))
}
module.exports = checkBin
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