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var crypto = require('crypto')
var resolve = require('path').resolve
var lockfile = require('lockfile')
var log = require('npmlog')
var npm = require('../npm.js')
var correctMkdir = require('../utils/correct-mkdir.js')
var installLocks = {}
function lockFileName (base, name) {
var c = name.replace(/[^a-zA-Z0-9]+/g, '-').replace(/^-+|-+$/g, '')
var p = resolve(base, name)
var h = crypto.createHash('sha1').update(p).digest('hex')
var l = resolve(npm.cache, '_locks')
return resolve(l, c.substr(0, 24) + '-' + h.substr(0, 16) + '.lock')
}
function lock (base, name, cb) {
var lockDir = resolve(npm.cache, '_locks')
correctMkdir(lockDir, function (er) {
if (er) return cb(er)
var opts = {
stale: npm.config.get('cache-lock-stale'),
retries: npm.config.get('cache-lock-retries'),
wait: npm.config.get('cache-lock-wait')
}
var lf = lockFileName(base, name)
lockfile.lock(lf, opts, function (er) {
if (er) log.warn('locking', lf, 'failed', er)
if (!er) {
log.verbose('lock', 'using', lf, 'for', resolve(base, name))
installLocks[lf] = true
}
cb(er)
})
})
}
function unlock (base, name, cb) {
var lf = lockFileName(base, name)
var locked = installLocks[lf]
if (locked === false) {
return process.nextTick(cb)
} else if (locked === true) {
lockfile.unlock(lf, function (er) {
if (er) {
log.warn('unlocking', lf, 'failed', er)
} else {
installLocks[lf] = false
log.verbose('unlock', 'done using', lf, 'for', resolve(base, name))
}
cb(er)
})
} else {
var notLocked = new Error(
'Attempt to unlock ' + resolve(base, name) + ", which hasn't been locked"
)
notLocked.code = 'ENOTLOCKED'
throw notLocked
}
}
module.exports = {
lock: lock,
unlock: unlock
}