Current File : //lib/node_modules/npm/node_modules/gentle-fs/lib/bin-link.js
'use strict'
// calls linkIfExists on unix, or cmdShimIfExists on Windows
// reads the cmd shim to ensure it's where we need it to be in the case of
// top level global packages
const readCmdShim = require('read-cmd-shim')
const cmdShim = require('cmd-shim')
const {linkIfExists} = require('./link.js')
const binLink = (from, to, opts, cb) => {
// just for testing
const platform = opts._FAKE_PLATFORM_ || process.platform
if (platform !== 'win32') {
return linkIfExists(from, to, opts, cb)
}
if (!opts.clobberLinkGently ||
opts.force === true ||
!opts.gently ||
typeof opts.gently !== 'string') {
// easy, just go ahead and delete anything in the way
return cmdShim.ifExists(from, to, cb)
}
// read all three shim targets
// if any exist, and are not a shim to our gently folder, then
// exit with a simulated EEXIST error.
const shimFiles = [
to,
to + '.cmd',
to + '.ps1'
]
// call this once we've checked all three, if we're good
const done = () => cmdShim.ifExists(from, to, cb)
const then = times(3, done, cb)
shimFiles.forEach(to => isClobberable(from, to, opts, then))
}
const times = (n, ok, cb) => {
let errState = null
return er => {
if (!errState) {
if (er) {
cb(errState = er)
} else if (--n === 0) {
ok()
}
}
}
}
const isClobberable = (from, to, opts, cb) => {
readCmdShim(to, (er, target) => {
// either going to get an error, or the target of where this
// cmd shim points.
// shim, not in opts.gently: simulate EEXIST
// not a shim: simulate EEXIST
// ENOENT: fine, move forward
// shim in opts.gently: fine
if (er) {
switch (er.code) {
case 'ENOENT':
// totally fine, nothing there to clobber
return cb()
case 'ENOTASHIM':
// something is there, and it's not one of ours
return cb(simulateEEXIST(from, to))
default:
// would probably fail this way later anyway
// can't read the file, likely can't write it either
return cb(er)
}
}
// no error, check the target
if (target.indexOf(opts.gently) !== 0) {
return cb(simulateEEXIST(from, to))
}
// ok! it's one of ours.
return cb()
})
}
const simulateEEXIST = (from, to) => {
// simulate the EEXIST we'd get from fs.symlink to the file
const err = new Error('EEXIST: file already exists, cmd shim \'' +
from + '\' -> \'' + to + '\'')
err.code = 'EEXIST'
err.path = from
err.dest = to
return err
}
module.exports = binLink
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