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refs: make sha1 output parameter of refs_resolve_ref_unsafe() optional

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Allow callers of refs_resolve_ref_unsafe() to pass NULL if they don't
need the resolved hash value.  We already allow the same for the flags
parameter.  This new leniency is inherited by the various wrappers like
resolve_ref_unsafe().

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2017-09-23 11:41:45 +02:00 committed by Junio C Hamano
parent 59c0ea183a
commit 54fad6614f
2 changed files with 8 additions and 4 deletions
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3
refs.c
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@ -1396,9 +1396,12 @@ const char *refs_resolve_ref_unsafe(struct ref_store *refs,
unsigned char *sha1, int *flags)
{
static struct strbuf sb_refname = STRBUF_INIT;
struct object_id unused_oid;
int unused_flags;
int symref_count;
if (!sha1)
sha1 = unused_oid.hash;
if (!flags)
flags = &unused_flags;

9
refs.h
View File

@ -10,10 +10,11 @@ struct worktree;
/*
* Resolve a reference, recursively following symbolic refererences.
*
* Store the referred-to object's name in sha1 and return the name of
* the non-symbolic reference that ultimately pointed at it. The
* return value, if not NULL, is a pointer into either a static buffer
* or the input ref.
* Return the name of the non-symbolic reference that ultimately pointed
* at the resolved object name. The return value, if not NULL, is a
* pointer into either a static buffer or the input ref.
*
* If sha1 is non-NULL, store the referred-to object's name in it.
*
* If the reference cannot be resolved to an object, the behavior
* depends on the RESOLVE_REF_READING flag: