Revision a8637a8e43f8023d742727c1463ac01992860940 authored by Alon Zakai on 04 January 2016, 22:57:24 UTC, committed by Alon Zakai on 04 January 2016, 22:57:24 UTC
1 parent 907b627
library_nodefs.js
mergeInto(LibraryManager.library, {
$NODEFS__deps: ['$FS', '$PATH'],
$NODEFS__postset: 'if (ENVIRONMENT_IS_NODE) { var fs = require("fs"); var NODEJS_PATH = require("path"); NODEFS.staticInit(); }',
$NODEFS: {
isWindows: false,
staticInit: function() {
NODEFS.isWindows = !!process.platform.match(/^win/);
},
mount: function (mount) {
assert(ENVIRONMENT_IS_NODE);
return NODEFS.createNode(null, '/', NODEFS.getMode(mount.opts.root), 0);
},
createNode: function (parent, name, mode, dev) {
if (!FS.isDir(mode) && !FS.isFile(mode) && !FS.isLink(mode)) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
var node = FS.createNode(parent, name, mode);
node.node_ops = NODEFS.node_ops;
node.stream_ops = NODEFS.stream_ops;
return node;
},
getMode: function (path) {
var stat;
try {
stat = fs.lstatSync(path);
if (NODEFS.isWindows) {
// On Windows, directories return permission bits 'rw-rw-rw-', even though they have 'rwxrwxrwx', so
// propagate write bits to execute bits.
stat.mode = stat.mode | ((stat.mode & 146) >> 1);
}
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
return stat.mode;
},
realPath: function (node) {
var parts = [];
while (node.parent !== node) {
parts.push(node.name);
node = node.parent;
}
parts.push(node.mount.opts.root);
parts.reverse();
return PATH.join.apply(null, parts);
},
// This maps the integer permission modes from http://linux.die.net/man/3/open
// to node.js-specific file open permission strings at http://nodejs.org/api/fs.html#fs_fs_open_path_flags_mode_callback
flagsToPermissionStringMap: {
0/*O_RDONLY*/: 'r',
1/*O_WRONLY*/: 'r+',
2/*O_RDWR*/: 'r+',
64/*O_CREAT*/: 'r',
65/*O_WRONLY|O_CREAT*/: 'r+',
66/*O_RDWR|O_CREAT*/: 'r+',
129/*O_WRONLY|O_EXCL*/: 'rx+',
193/*O_WRONLY|O_CREAT|O_EXCL*/: 'rx+',
514/*O_RDWR|O_TRUNC*/: 'w+',
577/*O_WRONLY|O_CREAT|O_TRUNC*/: 'w',
578/*O_CREAT|O_RDWR|O_TRUNC*/: 'w+',
705/*O_WRONLY|O_CREAT|O_EXCL|O_TRUNC*/: 'wx',
706/*O_RDWR|O_CREAT|O_EXCL|O_TRUNC*/: 'wx+',
1024/*O_APPEND*/: 'a',
1025/*O_WRONLY|O_APPEND*/: 'a',
1026/*O_RDWR|O_APPEND*/: 'a+',
1089/*O_WRONLY|O_CREAT|O_APPEND*/: 'a',
1090/*O_RDWR|O_CREAT|O_APPEND*/: 'a+',
1153/*O_WRONLY|O_EXCL|O_APPEND*/: 'ax',
1154/*O_RDWR|O_EXCL|O_APPEND*/: 'ax+',
1217/*O_WRONLY|O_CREAT|O_EXCL|O_APPEND*/: 'ax',
1218/*O_RDWR|O_CREAT|O_EXCL|O_APPEND*/: 'ax+',
4096/*O_RDONLY|O_DSYNC*/: 'rs',
4098/*O_RDWR|O_DSYNC*/: 'rs+'
},
flagsToPermissionString: function(flags) {
flags &= ~0100000 /*O_LARGEFILE*/; // Ignore this flag from musl, otherwise node.js fails to open the file.
flags &= ~02000000 /*O_CLOEXEC*/; // Some applications may pass it; it makes no sense for a single process.
if (flags in NODEFS.flagsToPermissionStringMap) {
return NODEFS.flagsToPermissionStringMap[flags];
} else {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
},
node_ops: {
getattr: function(node) {
var path = NODEFS.realPath(node);
var stat;
try {
stat = fs.lstatSync(path);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
// node.js v0.10.20 doesn't report blksize and blocks on Windows. Fake them with default blksize of 4096.
// See http://support.microsoft.com/kb/140365
if (NODEFS.isWindows && !stat.blksize) {
stat.blksize = 4096;
}
if (NODEFS.isWindows && !stat.blocks) {
stat.blocks = (stat.size+stat.blksize-1)/stat.blksize|0;
}
return {
dev: stat.dev,
ino: stat.ino,
mode: stat.mode,
nlink: stat.nlink,
uid: stat.uid,
gid: stat.gid,
rdev: stat.rdev,
size: stat.size,
atime: stat.atime,
mtime: stat.mtime,
ctime: stat.ctime,
blksize: stat.blksize,
blocks: stat.blocks
};
},
setattr: function(node, attr) {
var path = NODEFS.realPath(node);
try {
if (attr.mode !== undefined) {
fs.chmodSync(path, attr.mode);
// update the common node structure mode as well
node.mode = attr.mode;
}
if (attr.timestamp !== undefined) {
var date = new Date(attr.timestamp);
fs.utimesSync(path, date, date);
}
if (attr.size !== undefined) {
fs.truncateSync(path, attr.size);
}
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
lookup: function (parent, name) {
var path = PATH.join2(NODEFS.realPath(parent), name);
var mode = NODEFS.getMode(path);
return NODEFS.createNode(parent, name, mode);
},
mknod: function (parent, name, mode, dev) {
var node = NODEFS.createNode(parent, name, mode, dev);
// create the backing node for this in the fs root as well
var path = NODEFS.realPath(node);
try {
if (FS.isDir(node.mode)) {
fs.mkdirSync(path, node.mode);
} else {
fs.writeFileSync(path, '', { mode: node.mode });
}
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
return node;
},
rename: function (oldNode, newDir, newName) {
var oldPath = NODEFS.realPath(oldNode);
var newPath = PATH.join2(NODEFS.realPath(newDir), newName);
try {
fs.renameSync(oldPath, newPath);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
unlink: function(parent, name) {
var path = PATH.join2(NODEFS.realPath(parent), name);
try {
fs.unlinkSync(path);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
rmdir: function(parent, name) {
var path = PATH.join2(NODEFS.realPath(parent), name);
try {
fs.rmdirSync(path);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
readdir: function(node) {
var path = NODEFS.realPath(node);
try {
return fs.readdirSync(path);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
symlink: function(parent, newName, oldPath) {
var newPath = PATH.join2(NODEFS.realPath(parent), newName);
try {
fs.symlinkSync(oldPath, newPath);
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
readlink: function(node) {
var path = NODEFS.realPath(node);
try {
path = fs.readlinkSync(path);
path = NODEJS_PATH.relative(NODEJS_PATH.resolve(node.mount.opts.root), path);
return path;
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
},
stream_ops: {
open: function (stream) {
var path = NODEFS.realPath(stream.node);
try {
if (FS.isFile(stream.node.mode)) {
stream.nfd = fs.openSync(path, NODEFS.flagsToPermissionString(stream.flags));
}
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
close: function (stream) {
try {
if (FS.isFile(stream.node.mode) && stream.nfd) {
fs.closeSync(stream.nfd);
}
} catch (e) {
if (!e.code) throw e;
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
},
read: function (stream, buffer, offset, length, position) {
if (length === 0) return 0; // node errors on 0 length reads
// FIXME this is terrible.
var nbuffer = new Buffer(length);
var res;
try {
res = fs.readSync(stream.nfd, nbuffer, 0, length, position);
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
if (res > 0) {
for (var i = 0; i < res; i++) {
buffer[offset + i] = nbuffer[i];
}
}
return res;
},
write: function (stream, buffer, offset, length, position) {
// FIXME this is terrible.
var nbuffer = new Buffer(buffer.subarray(offset, offset + length));
var res;
try {
res = fs.writeSync(stream.nfd, nbuffer, 0, length, position);
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
return res;
},
llseek: function (stream, offset, whence) {
var position = offset;
if (whence === 1) { // SEEK_CUR.
position += stream.position;
} else if (whence === 2) { // SEEK_END.
if (FS.isFile(stream.node.mode)) {
try {
var stat = fs.fstatSync(stream.nfd);
position += stat.size;
} catch (e) {
throw new FS.ErrnoError(ERRNO_CODES[e.code]);
}
}
}
if (position < 0) {
throw new FS.ErrnoError(ERRNO_CODES.EINVAL);
}
return position;
}
}
}
});
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