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'use strict';
var fs = require('graceful-fs');
var assign = require('object-assign');
var isEqual = require('lodash.isequal');
var isValidDate = require('vali-date');
// TODO shared module
// TODO include sticky/setuid/setgid, i.e. 7777?
var MASK_MODE = parseInt('0777', 8);
var DEFAULT_FILE_MODE = parseInt('0666', 8);
var APPEND_MODE_REGEXP = /a/;
function closeFd(propagatedErr, fd, callback) {
if (typeof fd !== 'number') {
return callback(propagatedErr);
}
fs.close(fd, onClosed);
function onClosed(closeErr) {
if (propagatedErr || closeErr) {
return callback(propagatedErr || closeErr);
}
callback();
}
}
function getModeDiff(fsMode, vinylMode) {
var modeDiff = 0;
if (typeof vinylMode === 'number') {
modeDiff = (vinylMode ^ fsMode) & MASK_MODE;
}
return modeDiff;
}
function getTimesDiff(fsStat, vinylStat) {
if (!isValidDate(vinylStat.mtime)) {
return;
}
if (isEqual(vinylStat.mtime, fsStat.mtime) &&
isEqual(vinylStat.atime, fsStat.atime)) {
return;
}
var atime;
if (isValidDate(vinylStat.atime)) {
atime = vinylStat.atime;
} else {
atime = fsStat.atime;
}
if (!isValidDate(atime)) {
atime = undefined;
}
var timesDiff = {
mtime: vinylStat.mtime,
atime: atime,
};
return timesDiff;
}
function isOwner(fsStat) {
var hasGetuid = (typeof process.getuid === 'function');
var hasGeteuid = (typeof process.geteuid === 'function');
// If we don't have either, assume we don't have permissions.
// This should only happen on Windows.
// Windows basically noops fchmod and errors on futimes called on directories.
if (!hasGeteuid && !hasGetuid) {
return false;
}
var uid;
if (hasGeteuid) {
uid = process.geteuid();
} else {
uid = process.getuid();
}
if (fsStat.uid !== uid && uid !== 0) {
return false;
}
return true;
}
function updateMetadata(fd, file, callback) {
fs.fstat(fd, onStat);
function onStat(err, stat) {
if (err) {
return callback(err, fd);
}
// Check if mode needs to be updated
var modeDiff = getModeDiff(stat.mode, file.stat.mode);
// Check if atime/mtime need to be updated
var timesDiff = getTimesDiff(stat, file.stat);
// Set file.stat to the reflect current state on disk
assign(file.stat, stat);
// Nothing to do
if (!modeDiff && !timesDiff) {
return callback(null, fd);
}
// Check access, `futimes` and `fchmod` only work if we own the file,
// or if we are effectively root.
if (!isOwner(stat)) {
return callback(null, fd);
}
if (modeDiff) {
return mode();
}
times();
function mode() {
var mode = stat.mode ^ modeDiff;
fs.fchmod(fd, mode, onFchmod);
function onFchmod(fchmodErr) {
if (!fchmodErr) {
file.stat.mode = mode;
}
if (timesDiff) {
return times(fchmodErr);
}
callback(fchmodErr, fd);
}
}
function times(fchmodErr) {
fs.futimes(fd, timesDiff.atime, timesDiff.mtime, onFutimes);
function onFutimes(futimesErr) {
if (!futimesErr) {
file.stat.atime = timesDiff.atime;
file.stat.mtime = timesDiff.mtime;
}
callback(fchmodErr || futimesErr, fd);
}
}
}
}
/*
Custom writeFile implementation because we need access to the
file descriptor after the write is complete.
Most of the implementation taken from node core.
*/
function writeFile(path, data, options, callback) {
if (typeof options === 'function') {
callback = options;
options = {};
}
if (!Buffer.isBuffer(data)) {
callback(new TypeError('Data must be a Buffer'));
return;
}
if (!options) {
options = {};
}
// Default the same as node
var mode = options.mode || DEFAULT_FILE_MODE;
var flag = options.flag || 'w';
var position = APPEND_MODE_REGEXP.test(flag) ? null : 0;
fs.open(path, flag, mode, onOpen);
function onOpen(err, fd) {
if (err) {
return onComplete(err);
}
fs.write(fd, data, 0, data.length, position, onComplete);
function onComplete(err) {
callback(err, fd);
}
}
}
module.exports = {
closeFd: closeFd,
getModeDiff: getModeDiff,
getTimesDiff: getTimesDiff,
isOwner: isOwner,
updateMetadata: updateMetadata,
writeFile: writeFile,
};
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