Re: [PATCH v2 0/4] Handle FETCH_HEAD and MERGE_HEAD generically

"Han-Wen Nienhuys via GitGitGadget" [off-list ref] writes:

This moves the FETCH_HEAD handling into refs.c as discussed in 
https://public-inbox.org/git/xmqq5z9pav01.fsf@gitster.c.googlers.com/

Thanks.  The way the support for MERGE_HEAD is added to the series
looks very sensible, too.

Will replace.

     -+static int refs_read_fetch_head(struct ref_store *ref_store,
     -+				struct object_id *oid, struct strbuf *referent,
     -+				unsigned int *type)
     ++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, "FETCH_HEAD");
     ++	strbuf_addf(&full_path, "%s/%s", ref_store->gitdir, refname);
      +
      +	if (strbuf_read_file(&content, full_path.buf, 0) < 0)
      +		goto done;
     @@ refs.c: int for_each_rawref(each_ref_fn fn, void *cb_data)
       		      struct strbuf *referent, unsigned int *type)
       {
      -	return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type);
     -+	if (!strcmp(refname, "FETCH_HEAD")) {
     -+		return refs_read_fetch_head(ref_store, 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,