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130 lines
3.8 KiB
JavaScript
130 lines
3.8 KiB
JavaScript
'use strict'
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module.exports = writeFile
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module.exports.sync = writeFileSync
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module.exports._getTmpname = getTmpname // for testing
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var fs = require('graceful-fs')
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var chain = require('slide').chain
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var MurmurHash3 = require('imurmurhash')
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var extend = Object.assign || require('util')._extend
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var invocations = 0
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function getTmpname (filename) {
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return filename + '.' +
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MurmurHash3(__filename)
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.hash(String(process.pid))
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.hash(String(++invocations))
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.result()
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}
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function writeFile (filename, data, options, callback) {
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if (options instanceof Function) {
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callback = options
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options = null
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}
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if (!options) options = {}
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fs.realpath(filename, function (_, realname) {
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_writeFile(realname || filename, data, options, callback)
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})
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}
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function _writeFile (filename, data, options, callback) {
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var tmpfile = getTmpname(filename)
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if (options.mode && options.chown) {
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return thenWriteFile()
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} else {
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// Either mode or chown is not explicitly set
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// Default behavior is to copy it from original file
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return fs.stat(filename, function (err, stats) {
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if (err || !stats) return thenWriteFile()
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options = extend({}, options)
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if (!options.mode) {
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options.mode = stats.mode
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}
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if (!options.chown && process.getuid) {
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options.chown = { uid: stats.uid, gid: stats.gid }
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}
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return thenWriteFile()
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})
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}
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function thenWriteFile () {
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chain([
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[writeFileAsync, tmpfile, data, options.mode, options.encoding || 'utf8'],
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options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid],
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options.mode && [fs, fs.chmod, tmpfile, options.mode],
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[fs, fs.rename, tmpfile, filename]
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], function (err) {
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err ? fs.unlink(tmpfile, function () { callback(err) })
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: callback()
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})
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}
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// doing this instead of `fs.writeFile` in order to get the ability to
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// call `fsync`.
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function writeFileAsync (file, data, mode, encoding, cb) {
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fs.open(file, 'w', options.mode, function (err, fd) {
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if (err) return cb(err)
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if (Buffer.isBuffer(data)) {
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return fs.write(fd, data, 0, data.length, 0, syncAndClose)
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} else if (data != null) {
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return fs.write(fd, String(data), 0, String(encoding), syncAndClose)
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} else {
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return syncAndClose()
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}
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function syncAndClose (err) {
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if (err) return cb(err)
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fs.fsync(fd, function (err) {
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if (err) return cb(err)
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fs.close(fd, cb)
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})
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}
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})
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}
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}
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function writeFileSync (filename, data, options) {
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if (!options) options = {}
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try {
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filename = fs.realpathSync(filename)
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} catch (ex) {
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// it's ok, it'll happen on a not yet existing file
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}
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var tmpfile = getTmpname(filename)
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try {
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if (!options.mode || !options.chown) {
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// Either mode or chown is not explicitly set
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// Default behavior is to copy it from original file
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try {
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var stats = fs.statSync(filename)
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options = extend({}, options)
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if (!options.mode) {
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options.mode = stats.mode
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}
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if (!options.chown && process.getuid) {
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options.chown = { uid: stats.uid, gid: stats.gid }
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}
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} catch (ex) {
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// ignore stat errors
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}
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}
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var fd = fs.openSync(tmpfile, 'w', options.mode)
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if (Buffer.isBuffer(data)) {
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fs.writeSync(fd, data, 0, data.length, 0)
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} else if (data != null) {
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fs.writeSync(fd, String(data), 0, String(options.encoding || 'utf8'))
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}
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fs.fsyncSync(fd)
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fs.closeSync(fd)
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if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid)
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if (options.mode) fs.chmodSync(tmpfile, options.mode)
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fs.renameSync(tmpfile, filename)
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} catch (err) {
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try { fs.unlinkSync(tmpfile) } catch (e) {}
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throw err
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}
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}
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