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author | Florian Dold <florian.dold@gmail.com> | 2017-05-28 00:38:50 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-28 00:40:43 +0200 |
commit | 7fff4499fd915bcea3fa93b1aa8b35f4fe7a6027 (patch) | |
tree | 6de9a1aebd150a23b7f8c273ec657a5d0a18fe3e /node_modules/write-file-atomic/index.js | |
parent | 963b7a41feb29cc4be090a2446bdfe0c1f1bcd81 (diff) | |
download | wallet-core-7fff4499fd915bcea3fa93b1aa8b35f4fe7a6027.tar.xz |
add linting (and some initial fixes)
Diffstat (limited to 'node_modules/write-file-atomic/index.js')
-rw-r--r-- | node_modules/write-file-atomic/index.js | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/node_modules/write-file-atomic/index.js b/node_modules/write-file-atomic/index.js new file mode 100644 index 000000000..c677ee962 --- /dev/null +++ b/node_modules/write-file-atomic/index.js @@ -0,0 +1,134 @@ +'use strict' +module.exports = writeFile +module.exports.sync = writeFileSync +module.exports._getTmpname = getTmpname // for testing + +var fs = require('graceful-fs') +var chain = require('slide').chain +var MurmurHash3 = require('imurmurhash') + +var invocations = 0 +function getTmpname (filename) { + return filename + '.' + + MurmurHash3(__filename) + .hash(String(process.pid)) + .hash(String(++invocations)) + .result() +} + +function writeFile (filename, data, options, callback) { + if (options instanceof Function) { + callback = options + options = null + } + if (!options) options = {} + fs.realpath(filename, function (_, realname) { + _writeFile(realname || filename, data, options, callback) + }) +} +function _writeFile (filename, data, options, callback) { + var tmpfile = getTmpname(filename) + + if (options.mode && options.chown) { + return thenWriteFile() + } else { + // Either mode or chown is not explicitly set + // Default behavior is to copy it from original file + return fs.stat(filename, function (err, stats) { + if (err || !stats) return thenWriteFile() + + options = Object.assign({}, options) + if (!options.mode) { + options.mode = stats.mode + } + if (!options.chown && process.getuid) { + options.chown = { uid: stats.uid, gid: stats.gid } + } + return thenWriteFile() + }) + } + + function thenWriteFile () { + chain([ + [writeFileAsync, tmpfile, data, options.mode, options.encoding || 'utf8'], + options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid], + options.mode && [fs, fs.chmod, tmpfile, options.mode], + [fs, fs.rename, tmpfile, filename] + ], function (err) { + err ? fs.unlink(tmpfile, function () { callback(err) }) + : callback() + }) + } + + // doing this instead of `fs.writeFile` in order to get the ability to + // call `fsync`. + function writeFileAsync (file, data, mode, encoding, cb) { + fs.open(file, 'w', options.mode, function (err, fd) { + if (err) return cb(err) + if (Buffer.isBuffer(data)) { + return fs.write(fd, data, 0, data.length, 0, syncAndClose) + } else if (data != null) { + return fs.write(fd, String(data), 0, String(encoding), syncAndClose) + } else { + return syncAndClose() + } + function syncAndClose (err) { + if (err) return cb(err) + if (options.fsync !== false) { + fs.fsync(fd, function (err) { + if (err) return cb(err) + fs.close(fd, cb) + }) + } else { + fs.close(fd, cb) + } + } + }) + } +} + +function writeFileSync (filename, data, options) { + if (!options) options = {} + try { + filename = fs.realpathSync(filename) + } catch (ex) { + // it's ok, it'll happen on a not yet existing file + } + var tmpfile = getTmpname(filename) + + try { + if (!options.mode || !options.chown) { + // Either mode or chown is not explicitly set + // Default behavior is to copy it from original file + try { + var stats = fs.statSync(filename) + options = Object.assign({}, options) + if (!options.mode) { + options.mode = stats.mode + } + if (!options.chown && process.getuid) { + options.chown = { uid: stats.uid, gid: stats.gid } + } + } catch (ex) { + // ignore stat errors + } + } + + var fd = fs.openSync(tmpfile, 'w', options.mode) + if (Buffer.isBuffer(data)) { + fs.writeSync(fd, data, 0, data.length, 0) + } else if (data != null) { + fs.writeSync(fd, String(data), 0, String(options.encoding || 'utf8')) + } + if (options.fsync !== false) { + fs.fsyncSync(fd) + } + fs.closeSync(fd) + if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid) + if (options.mode) fs.chmodSync(tmpfile, options.mode) + fs.renameSync(tmpfile, filename) + } catch (err) { + try { fs.unlinkSync(tmpfile) } catch (e) {} + throw err + } +} |