[PATCH v2 7/9] update-ref: move transaction handling into `update_refs_stdin()`

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While the actual logic to update the transaction is handled in
`update_refs_stdin()`, the transaction itself is started and committed
in `cmd_update_ref()` itself. This makes it hard to handle transaction
abortion and commits as part of `update_refs_stdin()` itself, which is
required in order to introduce transaction handling features to `git
update-refs --stdin`.

Refactor the code to move all transaction handling into
`update_refs_stdin()` to prepare for transaction handling features.

Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
 builtin/update-ref.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 139c3b11fa..1a7906545d 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -346,15 +346,21 @@ static const struct parse_cmd {
 	{ "option", parse_cmd_option },
 };
 
-static void update_refs_stdin(struct ref_transaction *transaction)
+static void update_refs_stdin(void)
 {
-	struct strbuf input = STRBUF_INIT;
+	struct strbuf input = STRBUF_INIT, err = STRBUF_INIT;
+	struct ref_transaction *transaction;
 	const char *next;
 	int i;
 
 	if (strbuf_read(&input, 0, 1000) < 0)
 		die_errno("could not read from stdin");
 	next = input.buf;
+
+	transaction = ref_transaction_begin(&err);
+	if (!transaction)
+		die("%s", err.buf);
+
 	/* Read each line dispatch its command */
 	while (next < input.buf + input.len) {
 		const struct parse_cmd *cmd = NULL;
@@ -389,6 +395,11 @@ static void update_refs_stdin(struct ref_transaction *transaction)
 		next++;
 	}
 
+	if (ref_transaction_commit(transaction, &err))
+		die("%s", err.buf);
+
+	ref_transaction_free(transaction);
+	strbuf_release(&err);
 	strbuf_release(&input);
 }
 
@@ -423,21 +434,11 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
 	}
 
 	if (read_stdin) {
-		struct strbuf err = STRBUF_INIT;
-		struct ref_transaction *transaction;
-
-		transaction = ref_transaction_begin(&err);
-		if (!transaction)
-			die("%s", err.buf);
 		if (delete || argc > 0)
 			usage_with_options(git_update_ref_usage, options);
 		if (end_null)
 			line_termination = '\0';
-		update_refs_stdin(transaction);
-		if (ref_transaction_commit(transaction, &err))
-			die("%s", err.buf);
-		ref_transaction_free(transaction);
-		strbuf_release(&err);
+		update_refs_stdin();
 		return 0;
 	}
 
-- 
2.26.0

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