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idtools: avoid direct use of C.stderr to fix musl cgo build failures #559

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Merged
mtrmac merged 1 commit into from
Jan 6, 2026
Merged

idtools: avoid direct use of C.stderr to fix musl cgo build failures #559

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8 changes: 7 additions & 1 deletion storage/pkg/idtools/idtools_supported.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,12 @@ struct subid_range get_range(struct subid_range *ranges, int i)
return ranges[i];
}

// helper for stderr to avoid referencing C.stderr from Go code,
// which breaks cgo on musl due to stderr being declared as FILE *const
static FILE *subid_stderr(void) {
return stderr;
}

#if !defined(SUBID_ABI_MAJOR) || (SUBID_ABI_MAJOR < 4)
# define subid_init libsubid_init
# define subid_get_uid_ranges get_subuid_ranges
Expand All @@ -44,7 +50,7 @@ func readSubid(username string, isUser bool) (ranges, error) {
}

onceInit.Do(func() {
C.subid_init(C.CString("storage"), C.stderr)
C.subid_init(C.CString("storage"), C.subid_stderr())
})

cUsername := C.CString(username)
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