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refs: read FETCH_HEAD and MERGE_HEAD generically 

The FETCH_HEAD and MERGE_HEAD refs must be stored in a file, regardless of the
type of ref backend. This is because they can hold more than just a single ref.

To accomodate them for alternate ref backends, read them from a file generically
in refs_read_raw_ref()

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys 2020-08-19 14:27:58 +00:00 committed by Junio C Hamano
parent 5085aef4c8
commit e811530278
1 changed files with 27 additions and 1 deletions
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28
refs.c
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@ -1634,11 +1634,37 @@ int for_each_rawref(each_ref_fn fn, void *cb_data)
return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data);
}
static int refs_read_special_head(struct ref_store *ref_store,
const char *refname, struct object_id *oid,
struct strbuf *referent, unsigned int *type)
{
struct strbuf full_path = STRBUF_INIT;
struct strbuf content = STRBUF_INIT;
int result = -1;
strbuf_addf(&full_path, "%s/%s", ref_store->gitdir, refname);
if (strbuf_read_file(&content, full_path.buf, 0) < 0)
goto done;
result = parse_loose_ref_contents(content.buf, oid, referent, type);
done:
strbuf_release(&full_path);
strbuf_release(&content);
return result;
}
int refs_read_raw_ref(struct ref_store *ref_store,
const char *refname, struct object_id *oid,
struct strbuf *referent, unsigned int *type)
{
return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type);
if (!strcmp(refname, "FETCH_HEAD") || !strcmp(refname, "MERGE_HEAD")) {
return refs_read_special_head(ref_store, refname, oid, referent,
type);
}
return ref_store->be->read_raw_ref(ref_store, refname, oid, referent,
type);
}
/* This function needs to return a meaningful errno on failure */