There are two different locations where we're appending to FETCH_HEAD:
first when storing updated references, and second when backfilling tags.
Both times we open the file, append to it and then commit it into place,
which is essentially duplicate work.

Improve the lifecycle of updating FETCH_HEAD by opening and committing
it once in `do_fetch()`, where we pass the structure down to the code
which wants to append to it.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 builtin/fetch.c | 35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 904ca9f1ca..f8adb40b45 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1084,9 +1084,8 @@ N_("it took %.2f seconds to check forced updates; you can use\n"
 
 static int store_updated_refs(const char *raw_url, const char *remote_name,
 			      int connectivity_checked, struct ref *ref_map,
-			      struct worktree **worktrees)
+			      struct fetch_head *fetch_head, struct worktree **worktrees)
 {
-	struct fetch_head fetch_head;
 	int url_len, i, rc = 0;
 	struct strbuf note = STRBUF_INIT, err = STRBUF_INIT;
 	struct ref_transaction *transaction = NULL;
@@ -1096,10 +1095,6 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 	int want_status;
 	int summary_width = transport_summary_width(ref_map);
 
-	rc = open_fetch_head(&fetch_head);
-	if (rc)
-		return -1;
-
 	if (raw_url)
 		url = transport_anonymize_url(raw_url);
 	else
@@ -1206,7 +1201,7 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 				strbuf_addf(&note, "'%s' of ", what);
 			}
 
-			append_fetch_head(&fetch_head, &rm->old_oid,
+			append_fetch_head(fetch_head, &rm->old_oid,
 					  rm->fetch_head_status,
 					  note.buf, url, url_len);
 
@@ -1246,9 +1241,6 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 		}
 	}
 
-	if (!rc)
-		commit_fetch_head(&fetch_head);
-
 	if (rc & STORE_REF_ERROR_DF_CONFLICT)
 		error(_("some local refs could not be updated; try running\n"
 		      " 'git remote prune %s' to remove any old, conflicting "
@@ -1268,7 +1260,6 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 	strbuf_release(&err);
 	ref_transaction_free(transaction);
 	free(url);
-	close_fetch_head(&fetch_head);
 	return rc;
 }
 
@@ -1309,6 +1300,7 @@ static int check_exist_and_connected(struct ref *ref_map)
 
 static int fetch_and_consume_refs(struct transport *transport,
 				  struct ref *ref_map,
+				  struct fetch_head *fetch_head,
 				  struct worktree **worktrees)
 {
 	int connectivity_checked = 1;
@@ -1331,7 +1323,7 @@ static int fetch_and_consume_refs(struct transport *transport,
 
 	trace2_region_enter("fetch", "consume_refs", the_repository);
 	ret = store_updated_refs(transport->url, transport->remote->name,
-				 connectivity_checked, ref_map, worktrees);
+				 connectivity_checked, ref_map, fetch_head, worktrees);
 	trace2_region_leave("fetch", "consume_refs", the_repository);
 
 out:
@@ -1503,7 +1495,9 @@ static struct transport *prepare_transport(struct remote *remote, int deepen)
 	return transport;
 }
 
-static void backfill_tags(struct transport *transport, struct ref *ref_map,
+static void backfill_tags(struct transport *transport,
+			  struct ref *ref_map,
+			  struct fetch_head *fetch_head,
 			  struct worktree **worktrees)
 {
 	int cannot_reuse;
@@ -1525,7 +1519,7 @@ static void backfill_tags(struct transport *transport, struct ref *ref_map,
 	transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 	transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 	transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
-	fetch_and_consume_refs(transport, ref_map, worktrees);
+	fetch_and_consume_refs(transport, ref_map, fetch_head, worktrees);
 
 	if (gsecondary) {
 		transport_disconnect(gsecondary);
@@ -1544,6 +1538,7 @@ static int do_fetch(struct transport *transport,
 		TRANSPORT_LS_REFS_OPTIONS_INIT;
 	int must_list_refs = 1;
 	struct worktree **worktrees = get_worktrees();
+	struct fetch_head fetch_head = { 0 };
 
 	if (tags == TAGS_DEFAULT) {
 		if (transport->remote->fetch_tags == 2)
@@ -1601,6 +1596,10 @@ static int do_fetch(struct transport *transport,
 	if (!update_head_ok)
 		check_not_current_branch(ref_map, worktrees);
 
+	retcode = open_fetch_head(&fetch_head);
+	if (retcode)
+		goto cleanup;
+
 	if (tags == TAGS_DEFAULT && autotags)
 		transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 	if (prune) {
@@ -1619,7 +1618,8 @@ static int do_fetch(struct transport *transport,
 		if (retcode != 0)
 			retcode = 1;
 	}
-	if (fetch_and_consume_refs(transport, ref_map, worktrees)) {
+
+	if (fetch_and_consume_refs(transport, ref_map, &fetch_head, worktrees)) {
 		retcode = 1;
 		goto cleanup;
 	}
@@ -1633,11 +1633,13 @@ static int do_fetch(struct transport *transport,
 
 		find_non_local_tags(remote_refs, &tags_ref_map, &tail);
 		if (tags_ref_map)
-			backfill_tags(transport, tags_ref_map, worktrees);
+			backfill_tags(transport, tags_ref_map, &fetch_head, worktrees);
 
 		free_refs(tags_ref_map);
 	}
 
+	commit_fetch_head(&fetch_head);
+
 	if (set_upstream) {
 		struct branch *branch = branch_get("HEAD");
 		struct ref *rm;
@@ -1693,6 +1695,7 @@ static int do_fetch(struct transport *transport,
 	}
 
 cleanup:
+	close_fetch_head(&fetch_head);
 	free_refs(ref_map);
 	free_worktrees(worktrees);
 	return retcode;
-- 
2.35.1