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45 lines
1.4 KiB
45 lines
1.4 KiB
'use strict'
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var fs = require('graceful-fs');
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var chain = require('slide').chain;
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var crypto = require('crypto');
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var md5hex = function () {
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var hash = crypto.createHash('md5');
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for (var ii=0; ii<arguments.length; ++ii) hash.update(''+arguments[ii])
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return hash.digest('hex')
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}
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var invocations = 0;
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var getTmpname = function (filename) {
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return filename + "." + md5hex(__filename, process.pid, ++invocations)
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}
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module.exports = 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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var tmpfile = getTmpname(filename);
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chain([
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[fs, fs.writeFile, tmpfile, data, options],
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options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid],
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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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module.exports.sync = function writeFileSync(filename, data, options) {
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if (!options) options = {};
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var tmpfile = getTmpname(filename);
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try {
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fs.writeFileSync(tmpfile, data, options);
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if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid);
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fs.renameSync(tmpfile, filename);
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}
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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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