From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx> This introduces refs_resolve_ref_unsafe_with_errno(), which makes the API contract for the errno output explicit. The implementation still relies on the global errno variable to ensure no side effects of this refactoring. lock_ref_oid_basic() in files-backend.c is the only caller of refs_resolve_ref() that needs error information to make logic decisions, so update that caller Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx> Reviewed-By: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx> --- refs/files-backend.c | 15 ++++++++------- refs/refs-internal.h | 8 ++++++++ 2 files changed, 16 insertions(+), 7 deletions(-) diff --git a/refs/files-backend.c b/refs/files-backend.c index b43ec4c66cb..d86893c6e0a 100644 --- a/refs/files-backend.c +++ b/refs/files-backend.c @@ -928,6 +928,7 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, int mustexist = (old_oid && !is_null_oid(old_oid)); int resolve_flags = RESOLVE_REF_NO_RECURSE; int resolved; + int resolve_errno = 0; files_assert_main_repository(refs, "lock_ref_oid_basic"); assert(err); @@ -940,10 +941,11 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; files_ref_path(refs, &ref_file, refname); - resolved = !!refs_resolve_ref_unsafe(&refs->base, - refname, resolve_flags, - &lock->old_oid, type); - if (!resolved && errno == EISDIR) { + resolved = !!refs_resolve_ref_unsafe_with_errno(&refs->base, refname, + resolve_flags, + &lock->old_oid, type, + &resolve_errno); + if (!resolved && resolve_errno == EISDIR) { /* * we are trying to lock foo but we used to * have foo/bar which now does not exist; @@ -963,15 +965,14 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, &lock->old_oid, type); } if (!resolved) { - int last_errno = errno; - if (last_errno != ENOTDIR || + if (resolve_errno != ENOTDIR || /* in case of D/F conflict, try to generate a better error * message. If that fails, fall back to strerror(ENOTDIR). */ !refs_verify_refname_available(&refs->base, refname, extras, skip, err)) strbuf_addf(err, "unable to resolve reference '%s': %s", - refname, strerror(last_errno)); + refname, strerror(resolve_errno)); goto error_return; } diff --git a/refs/refs-internal.h b/refs/refs-internal.h index bf581e70cf6..df01d5dc8df 100644 --- a/refs/refs-internal.h +++ b/refs/refs-internal.h @@ -153,6 +153,14 @@ int refs_read_raw_ref(struct ref_store *ref_store, const char *refname, struct object_id *oid, struct strbuf *referent, unsigned int *type, int *failure_errno); +/* Like refs_resolve_ref_unsafe, but provide access to errno code that lead to a + * failure. */ +const char *refs_resolve_ref_unsafe_with_errno(struct ref_store *refs, + const char *refname, + int resolve_flags, + struct object_id *oid, + int *flags, int *failure_errno); + /* * Write an error to `err` and return a nonzero value iff the same * refname appears multiple times in `refnames`. `refnames` must be -- gitgitgadget