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