[v5,2/5] rebase -i: support --committer-date-is-author-date
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Message ID 20200626095528.117524-3-phillip.wood123@gmail.com
State New
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Series
  • cleanup ra/rebase-i-more-options
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Commit Message

Phillip Wood June 26, 2020, 9:55 a.m. UTC
From: Phillip Wood <phillip.wood@dunelm.org.uk>

Rebase is implemented with two different backends - 'apply' and
'merge' each of which support a different set of options. In
particular the apply backend supports a number of options implemented
by 'git am' that are not implemented in the merge backend. This means
that the available options are different depending on which backend is
used which is confusing. This patch adds support for the
--committer-date-is-author-date option to the merge backend. This
option uses the author date of the commit that is being rewritten as
the committer date when the new commit is created.

Original-patch-by: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 Documentation/git-rebase.txt           | 10 +++--
 builtin/rebase.c                       | 17 +++++---
 sequencer.c                            | 60 +++++++++++++++++++++++++-
 sequencer.h                            |  1 +
 t/t3422-rebase-incompatible-options.sh |  1 -
 t/t3436-rebase-more-options.sh         | 58 ++++++++++++++++++++++++-
 6 files changed, 136 insertions(+), 11 deletions(-)

Patch
diff mbox series

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index b003784f01..dfa70263e6 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -445,9 +445,13 @@  if the other side had no changes that conflicted.
 See also INCOMPATIBLE OPTIONS below.
 
 --committer-date-is-author-date::
+	Instead of using the current time as the committer date, use
+	the author date of the commit being rebased as the committer
+	date. This option implies --force-rebase.
+
 --ignore-date::
-	These flags are passed to 'git am' to easily change the dates
-	of the rebased commits (see linkgit:git-am[1]).
+	This flag is passed to 'git am' to change the author date
+	of each rebased commit (see linkgit:git-am[1]).
 +
 See also INCOMPATIBLE OPTIONS below.
 
@@ -585,7 +589,6 @@  INCOMPATIBLE OPTIONS
 The following options:
 
  * --apply
- * --committer-date-is-author-date
  * --ignore-date
  * --whitespace
  * -C
@@ -613,6 +616,7 @@  In addition, the following pairs of options are incompatible:
  * --preserve-merges and --rebase-merges
  * --preserve-merges and --empty=
  * --preserve-merges and --ignore-whitespace
+ * --preserve-merges and --committer-date-is-author-date
  * --keep-base and --onto
  * --keep-base and --root
 
diff --git a/builtin/rebase.c b/builtin/rebase.c
index 810c9b7779..a7c3d5c92b 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -88,6 +88,7 @@  struct rebase_options {
 	int autosquash;
 	char *gpg_sign_opt;
 	int autostash;
+	int committer_date_is_author_date;
 	char *cmd;
 	int allow_empty_message;
 	int rebase_merges, rebase_cousins;
@@ -124,6 +125,8 @@  static struct replay_opts get_replay_opts(const struct rebase_options *opts)
 	replay.quiet = !(opts->flags & REBASE_NO_QUIET);
 	replay.verbose = opts->flags & REBASE_VERBOSE;
 	replay.reschedule_failed_exec = opts->reschedule_failed_exec;
+	replay.committer_date_is_author_date =
+					opts->committer_date_is_author_date;
 	replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
 	replay.strategy = opts->strategy;
 
@@ -1497,9 +1500,9 @@  int cmd_rebase(int argc, const char **argv, const char *prefix)
 			PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
 		OPT_BOOL(0, "signoff", &options.signoff,
 			 N_("add a Signed-off-by: line to each commit")),
-		OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
-				  &options.git_am_opts, NULL,
-				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
+		OPT_BOOL(0, "committer-date-is-author-date",
+			 &options.committer_date_is_author_date,
+			 N_("make committer date match author date")),
 		OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
 				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
 		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
@@ -1794,11 +1797,12 @@  int cmd_rebase(int argc, const char **argv, const char *prefix)
 	    options.autosquash) {
 		allow_preemptive_ff = 0;
 	}
+	if (options.committer_date_is_author_date)
+		options.flags |= REBASE_FORCE;
 
 	for (i = 0; i < options.git_am_opts.argc; i++) {
 		const char *option = options.git_am_opts.argv[i], *p;
-		if (!strcmp(option, "--committer-date-is-author-date") ||
-		    !strcmp(option, "--ignore-date") ||
+		if (!strcmp(option, "--ignore-date") ||
 		    !strcmp(option, "--whitespace=fix") ||
 		    !strcmp(option, "--whitespace=strip"))
 			allow_preemptive_ff = 0;
@@ -1855,6 +1859,9 @@  int cmd_rebase(int argc, const char **argv, const char *prefix)
 		if (ignore_whitespace)
 			argv_array_push (&options.git_am_opts,
 					 "--ignore-whitespace");
+		if (options.committer_date_is_author_date)
+			argv_array_push(&options.git_am_opts,
+					"--committer-date-is-author-date");
 	} else if (ignore_whitespace) {
 			string_list_append (&strategy_options,
 					    "ignore-space-change");
diff --git a/sequencer.c b/sequencer.c
index 6fd2674632..368d397970 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -149,6 +149,7 @@  static GIT_PATH_FUNC(rebase_path_refs_to_delete, "rebase-merge/refs-to-delete")
  * command-line.
  */
 static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
+static GIT_PATH_FUNC(rebase_path_cdate_is_adate, "rebase-merge/cdate_is_adate")
 static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
 static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
 static GIT_PATH_FUNC(rebase_path_quiet, "rebase-merge/quiet")
@@ -872,6 +873,22 @@  static char *get_author(const char *message)
 	return NULL;
 }
 
+static const char *author_date_from_env_array(const struct argv_array *env)
+{
+	int i;
+	const char *date;
+
+	for (i = 0; i < env->argc; i++)
+		if (skip_prefix(env->argv[i],
+				"GIT_AUTHOR_DATE=", &date))
+			return date;
+	/*
+	 * If GIT_AUTHOR_DATE is missing we should have already errored out when
+	 * reading the script
+	 */
+	BUG("GIT_AUTHOR_DATE missing from author script");
+}
+
 static const char staged_changes_advice[] =
 N_("you have staged changes in your working tree\n"
 "If these changes are meant to be squashed into the previous commit, run:\n"
@@ -938,6 +955,10 @@  static int run_git_commit(struct repository *r,
 			     gpg_opt, gpg_opt);
 	}
 
+	if (opts->committer_date_is_author_date)
+		argv_array_pushf(&cmd.env_array, "GIT_COMMITTER_DATE=%s",
+				 author_date_from_env_array(&cmd.env_array));
+
 	argv_array_push(&cmd.args, "commit");
 
 	if (!(flags & VERIFY_MSG))
@@ -1349,6 +1370,31 @@  static int try_to_commit(struct repository *r,
 		commit_list_insert(current_head, &parents);
 	}
 
+	if (opts->committer_date_is_author_date) {
+		struct ident_split ident;
+		struct strbuf date = STRBUF_INIT;
+
+		if (split_ident_line(&ident, author, (int)strlen(author)) < 0) {
+			res = error(_("malformed ident line '%s'"), author);
+			goto out;
+		}
+		if (!ident.date_begin) {
+			res = error(_("corrupted author without date information"));
+			goto out;
+		}
+
+		strbuf_addf(&date, "@%.*s %.*s",
+			    (int)(ident.date_end - ident.date_begin),
+			    ident.date_begin,
+			    (int)(ident.tz_end - ident.tz_begin),
+			    ident.tz_begin);
+		res = setenv("GIT_COMMITTER_DATE", date.buf, 1);
+		strbuf_release(&date);
+
+		if (res)
+			goto out;
+	}
+
 	if (write_index_as_tree(&tree, r->index, r->index_file, 0, NULL)) {
 		res = error(_("git write-tree failed to write a tree"));
 		goto out;
@@ -2532,6 +2578,11 @@  static int read_populate_opts(struct replay_opts *opts)
 			opts->signoff = 1;
 		}
 
+		if (file_exists(rebase_path_cdate_is_adate())) {
+			opts->allow_ff = 0;
+			opts->committer_date_is_author_date = 1;
+		}
+
 		if (file_exists(rebase_path_reschedule_failed_exec()))
 			opts->reschedule_failed_exec = 1;
 
@@ -2622,6 +2673,8 @@  int write_basic_state(struct replay_opts *opts, const char *head_name,
 		write_file(rebase_path_drop_redundant_commits(), "%s", "");
 	if (opts->keep_redundant_commits)
 		write_file(rebase_path_keep_redundant_commits(), "%s", "");
+	if (opts->committer_date_is_author_date)
+		write_file(rebase_path_cdate_is_adate(), "%s", "");
 	if (opts->reschedule_failed_exec)
 		write_file(rebase_path_reschedule_failed_exec(), "%s", "");
 
@@ -3542,6 +3595,10 @@  static int do_merge(struct repository *r,
 			goto leave_merge;
 		}
 
+		if (opts->committer_date_is_author_date)
+			argv_array_pushf(&cmd.env_array, "GIT_COMMITTER_DATE=%s",
+					 author_date_from_env_array(&cmd.env_array));
+
 		cmd.git_cmd = 1;
 		argv_array_push(&cmd.args, "merge");
 		argv_array_push(&cmd.args, "-s");
@@ -3819,7 +3876,8 @@  static int pick_commits(struct repository *r,
 	setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
 	if (opts->allow_ff)
 		assert(!(opts->signoff || opts->no_commit ||
-				opts->record_origin || opts->edit));
+				opts->record_origin || opts->edit ||
+				opts->committer_date_is_author_date));
 	if (read_and_refresh_cache(r, opts))
 		return -1;
 
diff --git a/sequencer.h b/sequencer.h
index 0bee85093e..4ab94119ae 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -45,6 +45,7 @@  struct replay_opts {
 	int verbose;
 	int quiet;
 	int reschedule_failed_exec;
+	int committer_date_is_author_date;
 
 	int mainline;
 
diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
index 55ca46786d..c8234062c6 100755
--- a/t/t3422-rebase-incompatible-options.sh
+++ b/t/t3422-rebase-incompatible-options.sh
@@ -61,7 +61,6 @@  test_rebase_am_only () {
 }
 
 test_rebase_am_only --whitespace=fix
-test_rebase_am_only --committer-date-is-author-date
 test_rebase_am_only -C4
 
 test_expect_success REBASE_P '--preserve-merges incompatible with --signoff' '
diff --git a/t/t3436-rebase-more-options.sh b/t/t3436-rebase-more-options.sh
index 4f8a6e51c9..50a63d8ebe 100755
--- a/t/t3436-rebase-more-options.sh
+++ b/t/t3436-rebase-more-options.sh
@@ -9,6 +9,9 @@  test_description='tests to ensure compatibility between am and interactive backe
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
+GIT_AUTHOR_DATE="1999-04-02T08:03:20+05:30"
+export GIT_AUTHOR_DATE
+
 # This is a special case in which both am and interactive backends
 # provide the same output. It was done intentionally because
 # both the backends fall short of optimal behaviour.
@@ -21,11 +24,20 @@  test_expect_success 'setup' '
 	test_write_lines "line 1" "new line 2" "line 3" >file &&
 	git commit -am "update file" &&
 	git tag side &&
+	test_commit commit1 foo foo1 &&
+	test_commit commit2 foo foo2 &&
+	test_commit commit3 foo foo3 &&
 
 	git checkout --orphan master &&
+	rm foo &&
 	test_write_lines "line 1" "        line 2" "line 3" >file &&
 	git commit -am "add file" &&
-	git tag main
+	git tag main &&
+
+	mkdir test-bin &&
+	write_script test-bin/git-merge-test <<-\EOF
+	exec git-merge-recursive "$@"
+	EOF
 '
 
 test_expect_success '--ignore-whitespace works with apply backend' '
@@ -52,6 +64,50 @@  test_expect_success '--ignore-whitespace is remembered when continuing' '
 	git diff --exit-code side
 '
 
+test_ctime_is_atime () {
+	git log $1 --format=%ai >authortime &&
+	git log $1 --format=%ci >committertime &&
+	test_cmp authortime committertime
+}
+
+test_expect_success '--committer-date-is-author-date works with apply backend' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	git rebase --apply --committer-date-is-author-date HEAD^ &&
+	test_ctime_is_atime -1
+'
+
+test_expect_success '--committer-date-is-author-date works with merge backend' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	git rebase -m --committer-date-is-author-date HEAD^ &&
+	test_ctime_is_atime -1
+'
+
+test_expect_success '--committer-date-is-author-date works with rebase -r' '
+	git checkout side &&
+	GIT_AUTHOR_DATE="@1234 +0300" git merge --no-ff commit3 &&
+	git rebase -r --root --committer-date-is-author-date &&
+	test_ctime_is_atime
+'
+
+test_expect_success '--committer-date-is-author-date works when forking merge' '
+	git checkout side &&
+	GIT_AUTHOR_DATE="@1234 +0300" git merge --no-ff commit3 &&
+	PATH="./test-bin:$PATH" git rebase -r --root --strategy=test \
+					--committer-date-is-author-date &&
+	test_ctime_is_atime
+'
+
+test_expect_success '--committer-date-is-author-date works when committing conflict resolution' '
+	git checkout commit2 &&
+	GIT_AUTHOR_DATE="@1980 +0000" git commit --amend --only --reset-author &&
+	test_must_fail git rebase -m --committer-date-is-author-date \
+		--onto HEAD^^ HEAD^ &&
+	echo resolved > foo &&
+	git add foo &&
+	git rebase --continue &&
+	test_ctime_is_atime -1
+'
+
 # This must be the last test in this file
 test_expect_success '$EDITOR and friends are unchanged' '
 	test_editor_unchanged