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[wasm] Fallback to emulated realpath on wasi-libc realpath ENOTSUP

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wasi-libc 22 and later support realpath(3)
(https://github.com/WebAssembly/wasi-libc/pull/463) but the underlying
host syscall may return ENOTSUP. This is typically the case when using
incomplete WASI polyfills on web browsers. For such cases, we should
fallback to the emulated realpath.
This commit is contained in:
Yuta Saito 2025-04-17 15:26:47 +00:00
parent d06ec25be4
commit b4f74e24d9
Notes: git 2025-04-17 22:48:07 +00:00 
Merged: https://github.com/ruby/ruby/pull/13124
1 changed files with 6 additions and 2 deletions
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8
file.c
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@ -4574,12 +4574,16 @@ rb_check_realpath_internal(VALUE basedir, VALUE path, rb_encoding *origenc, enum
if (origenc) unresolved_path = TO_OSPATH(unresolved_path);
if ((resolved_ptr = realpath(RSTRING_PTR(unresolved_path), resolved_buffer)) == NULL) {
/* glibc realpath(3) does not allow /path/to/file.rb/../other_file.rb,
/*
wasi-libc 22 and later support realpath(3) but return ENOTSUP
when the underlying host syscall returns it.
glibc realpath(3) does not allow /path/to/file.rb/../other_file.rb,
returning ENOTDIR in that case.
glibc realpath(3) can also return ENOENT for paths that exist,
such as /dev/fd/5.
Fallback to the emulated approach in either of those cases. */
if (errno == ENOTDIR ||
if (errno == ENOTSUP ||
errno == ENOTDIR ||
(errno == ENOENT && rb_file_exist_p(0, unresolved_path))) {
return rb_check_realpath_emulate(basedir, path, origenc, mode);