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Playground: fix ls -al timestamps and parent dir access

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Patch browser_wasi_shim File/Directory stat() to return current
timestamps instead of epoch 0 (which showed Jan 1 1970).

Patch path_filestat_get and path_open to resolve ".." at the
preopened root to "." instead of failing with NOTCAPABLE, matching
real filesystem behavior.
This commit is contained in:
Sylvestre Ledru
2026-04-04 11:43:42 +02:00
parent d2d1f52a10
commit a800abdb28
1 changed files with 22 additions and 1 deletions
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static/js/wasm-terminal.js
+22 -1
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@@ -148,10 +148,31 @@ async function initWasm() {
function getPersistentDir() {
if (persistentDir) return persistentDir;
const encoder = new TextEncoder();
// WASI nanosecond timestamp for "now"
const nowNs = BigInt(Date.now()) * 1_000_000n;
const fileEntries = Object.entries(SAMPLE_FILES).map(
([name, content]) => [name, new wasiShim.File(encoder.encode(content))]
([name, content]) => {
const file = new wasiShim.File(encoder.encode(content));
// browser_wasi_shim leaves timestamps at 0 (epoch 1970);
// patch them so ls shows a realistic date.
const origStat = file.stat.bind(file);
file.stat = () => { const s = origStat(); s.atim = nowNs; s.mtim = nowNs; s.ctim = nowNs; return s; };
return [name, file];
}
);
persistentDir = new wasiShim.PreopenDirectory(".", fileEntries);
// Also patch the root directory stat
const origDirStat = persistentDir.dir.stat.bind(persistentDir.dir);
persistentDir.dir.stat = () => { const s = origDirStat(); s.atim = nowNs; s.mtim = nowNs; s.ctim = nowNs; return s; };
// browser_wasi_shim rejects ".." at the root with ERRNO_NOTCAPABLE;
// real filesystems resolve it to the root itself. Patch path_filestat_get
// and path_open on the OpenDirectory prototype so ".." at root works.
const origPfsg = persistentDir.path_filestat_get.bind(persistentDir);
persistentDir.path_filestat_get = (flags, path) =>
origPfsg(flags, path === ".." ? "." : path);
const origPopen = persistentDir.path_open.bind(persistentDir);
persistentDir.path_open = (dirflags, path, oflags, base, inheriting, fdflags) =>
origPopen(dirflags, path === ".." ? "." : path, oflags, base, inheriting, fdflags);
return persistentDir;
}