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refs: remove EINVAL errno output from specification of read_raw_ref_fn

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This commit does not change code; it documents the fact that an alternate ref
backend does not need to return EINVAL from read_raw_ref_fn to function
properly.

This is correct, because refs_read_raw_ref is only called from;

* resolve_ref_unsafe(), which does not care for the EINVAL errno result.

* refs_verify_refname_available(), which does not inspect errno.

* files-backend.c, where errno is overwritten on failure.

* packed-backend.c (is_packed_transaction_needed), which calls it for the
  packed ref backend, which never emits EINVAL.

A grep for EINVAL */*c reveals that no code checks errno against EINVAL after
reading references. In addition, the refs.h file does not mention errno at all.

A grep over resolve_ref_unsafe() turned up the following callers that inspect
errno:

* sequencer.c::print_commit_summary, which uses it for die_errno

* lock_ref_oid_basic(), which only treats EISDIR and ENOTDIR specially.

The files ref backend does use EINVAL. The files backend does not call into
the generic API (refs_read_raw), but into the files-specific function
(files_read_raw_ref), which we are not changing in this commit.

As the errno sideband is unintuitive and error-prone, remove EINVAL
value, as a step towards getting rid of the errno sideband altogether.

Spotted by Ævar Arnfjörð Bjarmason <avarab@gmail.com>.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys 2021-08-23 13:52:38 +02:00 committed by Junio C Hamano
parent 3fa2e91d17
commit 20d422cfd7
1 changed files with 3 additions and 3 deletions
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6
refs/refs-internal.h
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@ -622,9 +622,9 @@ typedef int reflog_expire_fn(struct ref_store *ref_store,
*
* Return 0 on success. If the ref doesn't exist, set errno to ENOENT
* and return -1. If the ref exists but is neither a symbolic ref nor
* an object ID, it is broken; set REF_ISBROKEN in type, set errno to
* EINVAL, and return -1. If there is another error reading the ref,
* set errno appropriately and return -1.
* an object ID, it is broken; set REF_ISBROKEN in type, and return -1
* (errno should not be ENOENT) If there is another error reading the
* ref, set errno appropriately and return -1.
*
* Backend-specific flags might be set in type as well, regardless of
* outcome.