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[wasm] Fallback to emulated realpath on wasi-libc realpath ENOTSUP #13124

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Merged
merged 1 commit into from
Apr 17, 2025
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[wasm] Fallback to emulated realpath on wasi-libc realpath ENOTSUP #13124

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8 changes: 6 additions & 2 deletions file.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);

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