[PATCH v3] builtin/reflog: respect user config in "write" subcommand

[Michael Lohmann <git@lohmann.sh>]

The reflog write recognizes only GIT_COMMITTER_NAME and
GIT_COMMITTER_EMAIL environment variables, but forgot to honor the
user.name and user.email configuration variables, due to lack of
repo_config() call to grab these values from the configuration files.

The test suite sets these variables, so this behavior was unnoticed.

Ensure that the reflog write also uses the values of user.name and
user.email if set in the Git configuration.

Co-authored-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Michael Lohmann <git@lohmann.sh>
---
- Improved commit message according to Junio Hamanos suggestion
- moved repo_config() call above parse_options() (I can't judge where
  the proper place would be)
- add test to check if env variables overwrite config
- use $GIT_COMMITTER_DATE instead of that timestamp in existing test
  case

 builtin/reflog.c        |  2 ++
 t/t1421-reflog-write.sh | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/builtin/reflog.c b/builtin/reflog.c
index c8f6b93d60..dcbfe89339 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -418,6 +418,8 @@ static int cmd_reflog_write(int argc, const char **argv, const char *prefix,
 	const char *ref, *message;
 	int ret;
 
+	repo_config(repo, git_ident_config, NULL);
+
 	argc = parse_options(argc, argv, prefix, options, reflog_write_usage, 0);
 	if (argc != 4)
 		usage_with_options(reflog_write_usage, options);
diff --git a/t/t1421-reflog-write.sh b/t/t1421-reflog-write.sh
index 46df64c176..603ec3f6ed 100755
--- a/t/t1421-reflog-write.sh
+++ b/t/t1421-reflog-write.sh
@@ -108,6 +108,42 @@ test_expect_success 'simple writes' '
 	)
 '
 
+test_expect_success 'uses user.name and user.email config' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit initial &&
+		COMMIT_OID=$(git rev-parse HEAD) &&
+
+		sane_unset GIT_COMMITTER_NAME &&
+		sane_unset GIT_COMMITTER_EMAIL &&
+		git config --local user.name "Author" &&
+		git config --local user.email "a@uth.or" &&
+		git reflog write refs/heads/something $ZERO_OID $COMMIT_OID first &&
+		test_reflog_matches . refs/heads/something <<-EOF
+		$ZERO_OID $COMMIT_OID Author <a@uth.or> $GIT_COMMITTER_DATE	first
+		EOF
+	)
+'
+
+test_expect_success 'environment variables take precedence over config' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit initial &&
+		COMMIT_OID=$(git rev-parse HEAD) &&
+
+		git config --local user.name "Author" &&
+		git config --local user.email "a@uth.or" &&
+		git reflog write refs/heads/something $ZERO_OID $COMMIT_OID first &&
+		test_reflog_matches . refs/heads/something <<-EOF
+		$ZERO_OID $COMMIT_OID $SIGNATURE	first
+		EOF
+	)
+'
+
 test_expect_success 'can write to root ref' '
 	test_when_finished "rm -rf repo" &&
 	git init repo &&

base-commit: 821f583da6d30a84249f75f33501504d597bc16b
-- 
2.51.0.373.g6d4c29e8d5.dirty