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refs: standardize output of refs_read_symbolic_ref 

When the symbolic reference we want to read with refs_read_symbolic_ref
is actually not a symbolic reference, the files and the reftable
backends return different values (1 and -1 respectively). Standardize
the returned values so that 0 is success, -1 is a generic error and -2
is that the reference was actually non-symbolic.

Signed-off-by: Bence Ferdinandy <bence@ferdinandy.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Bence Ferdinandy 2024-11-22 13:28:44 +01:00 committed by Junio C Hamano
parent 2fd5555895
commit 8102d10ff8
4 changed files with 23 additions and 6 deletions
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11
refs.h
View File

@ -83,6 +83,17 @@ int refs_read_ref_full(struct ref_store *refs, const char *refname,

int refs_read_ref(struct ref_store *refs, const char *refname, struct object_id *oid);

#define NOT_A_SYMREF -2

/*
* Read the symbolic ref named "refname" and write its immediate referent into
* the provided buffer. Referent is left empty if "refname" is not a symbolic
* ref. It does not resolve the symbolic reference recursively in case the
* target is also a symbolic ref.
*
* Returns 0 on success, -2 if the "refname" is not a symbolic ref,
* -1 otherwise.
*/
int refs_read_symbolic_ref(struct ref_store *ref_store, const char *refname,
struct strbuf *referent);


7
refs/files-backend.c
View File

@ -596,10 +596,9 @@ static int files_read_symbolic_ref(struct ref_store *ref_store, const char *refn
unsigned int type;

ret = read_ref_internal(ref_store, refname, &oid, referent, &type, &failure_errno, 1);
if (ret)
return ret;

return !(type & REF_ISSYMREF);
if (!ret && !(type & REF_ISSYMREF))
return NOT_A_SYMREF;
return ret;
}

int parse_loose_ref_contents(const struct git_hash_algo *algop,

5
refs/refs-internal.h
View File

@ -673,6 +673,11 @@ struct ref_storage_be {

ref_iterator_begin_fn *iterator_begin;
read_raw_ref_fn *read_raw_ref;

/*
* Please refer to `refs_read_symbolic_ref()` for the expected
* behaviour.
*/
read_symbolic_ref_fn *read_symbolic_ref;

reflog_iterator_begin_fn *reflog_iterator_begin;

6
refs/reftable-backend.c
View File

@ -830,10 +830,12 @@ static int reftable_be_read_symbolic_ref(struct ref_store *ref_store,
return ret;

ret = reftable_stack_read_ref(stack, refname, &ref);
if (ret == 0 && ref.value_type == REFTABLE_REF_SYMREF)
if (ret)
ret = -1;
else if (ref.value_type == REFTABLE_REF_SYMREF)
strbuf_addstr(referent, ref.value.symref);
else
ret = -1;
ret = NOT_A_SYMREF;

reftable_ref_record_release(&ref);
return ret;