71 righe
2 KiB
JavaScript
71 righe
2 KiB
JavaScript
// 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 fs = require('fs')
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const {promisify} = require('util')
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const readlink = promisify(fs.readlink)
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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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// 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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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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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 target => {
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const current = await readCmdShim(target)
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.catch(er => handleReadCmdShimError({er, target}))
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if (!current)
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return
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const resolved = resolve(dirname(target), current.replace(/\\/g, '/'))
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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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module.exports = checkBin
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