Subject: [PATCH v7 4/5] commit, tag: parse --trailer with OPT_STRVEC

From: Li Chen <[email-masked]>
Date: Tue, 24 Feb 2026 15:05:50 +0800

Now that amend_file_with_trailers() expects raw trailer lines, do not
store argv-style "--trailer=<trailer>" strings in git commit and git
tag.

Parse --trailer using OPT_STRVEC so trailer_args contains only the
trailer value, and drop the temporary prefix stripping in
amend_file_with_trailers().

Signed-off-by: Li Chen <[email-masked]>
---
v7:
New patch.

 builtin/commit.c |  3 ++-
 builtin/tag.c    |  4 ++--
 trailer.c        | 21 +--------------------
 trailer.h        |  4 ++--
 4 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 9e3a09d532..d9983230de 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1720,7 +1720,8 @@ int cmd_commit(int argc,
 		OPT_STRING(0, "fixup", &fixup_message, N_("[(amend|reword):]commit"), N_("use autosquash formatted message to fixup or amend/reword specified commit")),
 		OPT_STRING(0, "squash", &squash_message, N_("commit"), N_("use autosquash formatted message to squash specified commit")),
 		OPT_BOOL(0, "reset-author", &renew_authorship, N_("the commit is authored by me now (used with -C/-c/--amend)")),
-		OPT_PASSTHRU_ARGV(0, "trailer", &trailer_args, N_("trailer"), N_("add custom trailer(s)"), PARSE_OPT_NONEG),
+		OPT_STRVEC(0, "trailer", &trailer_args, N_("trailer"),
+			   N_("add custom trailer(s)")),
 		OPT_BOOL('s', "signoff", &signoff, N_("add a Signed-off-by trailer")),
 		OPT_FILENAME('t', "template", &template_file, N_("use specified template file")),
 		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of commit")),
diff --git a/builtin/tag.c b/builtin/tag.c
index aeb04c487f..15aee1b03a 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -499,8 +499,8 @@ int cmd_tag(int argc,
 		OPT_CALLBACK_F('m', "message", &msg, N_("message"),
 			       N_("tag message"), PARSE_OPT_NONEG, parse_msg_arg),
 		OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
-		OPT_PASSTHRU_ARGV(0, "trailer", &trailer_args, N_("trailer"),
-				  N_("add custom trailer(s)"), PARSE_OPT_NONEG),
+		OPT_STRVEC(0, "trailer", &trailer_args, N_("trailer"),
+			   N_("add custom trailer(s)")),
 		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
 		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 		OPT_CLEANUP(&cleanup_arg),
diff --git a/trailer.c b/trailer.c
index 8e87d185d9..e85c6c9fbe 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1342,40 +1342,21 @@ int amend_file_with_trailers(const char *path,
 			     const struct strvec *trailer_args)
 {
 	struct strbuf buf = STRBUF_INIT;
-	struct strvec stripped_trailer_args = STRVEC_INIT;
 	int ret = 0;
-	size_t i;
 
 	if (!trailer_args)
 		BUG("amend_file_with_trailers called with NULL trailer_args");
 	if (!trailer_args->nr)
 		return 0;
 
-	for (i = 0; i < trailer_args->nr; i++) {
-		const char *txt = trailer_args->v[i];
-
-		/*
-		 * Historically amend_file_with_trailers() passed its arguments
-		 * to "git interpret-trailers", which expected argv entries in
-		 * "--trailer=<trailer>" form. Continue to accept those for
-		 * existing callers, but pass only the value portion to the
-		 * in-process implementation.
-		 */
-		skip_prefix(txt, "--trailer=", &txt);
-		if (!*txt)
-			die(_("empty --trailer argument"));
-		strvec_push(&stripped_trailer_args, txt);
-	}
-
 	if (strbuf_read_file(&buf, path, 0) < 0)
 		ret = error_errno(_("could not read '%s'"), path);
 	else
-		amend_strbuf_with_trailers(&buf, &stripped_trailer_args);
+		amend_strbuf_with_trailers(&buf, trailer_args);
 
 	if (!ret)
 		ret = write_file_in_place(path, &buf);
 
-	strvec_clear(&stripped_trailer_args);
 	strbuf_release(&buf);
 	return ret;
 }
diff --git a/trailer.h b/trailer.h
index d05dab050b..e5bd355aad 100644
--- a/trailer.h
+++ b/trailer.h
@@ -209,8 +209,8 @@ void amend_strbuf_with_trailers(struct strbuf *buf,
 /*
  * Augment a file by appending trailers specified in trailer_args.
  *
- * Each element of trailer_args should be an argv-style --trailer=<trailer>
- * option (i.e., including the --trailer= prefix).
+ * Each element of trailer_args should be in the same format as the value
+ * accepted by --trailer=<trailer> (i.e., without the --trailer= prefix).
  *
  * Returns 0 on success or a non-zero error code on failure.
  */
-- 
2.52.0