Re: [PATCH v4 3/6] rebase -i: support --committer-date-is-author-date

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Hi Rohit

On 07/09/2019 12:50, Rohit Ashiwal wrote:
rebase am already has this flag to "lie" about the committer date
by changing it to the author date. Let's add the same for
interactive machinery.
[...]> diff --git a/sequencer.c b/sequencer.c
index adeff2561e..fd925f2d72 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -147,6 +147,7 @@ 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")
@@ -879,6 +880,17 @@ static char *get_author(const char *message)
  	return NULL;
  }
+/* Returns a "date" string that needs to be free()'d by the caller */
+static char *read_author_date_or_null(void)
+{
+	char *date;
+
+	if (read_author_script(rebase_path_author_script(),
+			       NULL, NULL, &date, 0))
+		return NULL;
+	return date;
+}

This function and the hunk below are untested according to Stolee's latest test email [1]. We need a test that gets the sequencer to fork 'git commit' rewording a commit should do that.

Best Wishes

Phillip

[1] https://public-inbox.org/git/ed8e65a2-72e8-210c-d4a4-eacdb5c7b0e8@xxxxxxxxx/

  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 +950,24 @@ static int run_git_commit(struct repository *r,
cmd.git_cmd = 1; + if (opts->committer_date_is_author_date) {
+	        int res = -1;
+	        struct strbuf datebuf = STRBUF_INIT;
+	        char *date = read_author_date_or_null();
+
+	        if (!date)
+	                return -1;
+
+	        strbuf_addf(&datebuf, "@%s", date);
+	        res = setenv("GIT_COMMITTER_DATE", datebuf.buf, 1);
+
+		strbuf_release(&datebuf);
+	        free(date);
+
+	        if (res)
+	                return -1;
+        }
+
  	if (is_rebase_i(opts) && read_env_script(&cmd.env_array)) {
  		const char *gpg_opt = gpg_sign_opt_quoted(opts);
@@ -1331,7 +1361,6 @@ static int try_to_commit(struct repository *r, if (parse_head(r, &current_head))
  		return -1;
-
  	if (flags & AMEND_MSG) {
  		const char *exclude_gpgsig[] = { "gpgsig", NULL };
  		const char *out_enc = get_commit_output_encoding();
@@ -1359,6 +1388,26 @@ static int try_to_commit(struct repository *r,
  		commit_list_insert(current_head, &parents);
  	}
+ if (opts->committer_date_is_author_date) {
+		int len = strlen(author);
+		struct ident_split ident;
+		struct strbuf date = STRBUF_INIT;
+
+		if (split_ident_line(&ident, author, len) < 0)
+			return error(_("malformed ident line"));
+		if (!ident.date_begin)
+			return error(_("corrupted author without date information"));
+
+		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;
@@ -2473,6 +2522,11 @@ 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;
@@ -2555,6 +2609,8 @@ int write_basic_state(struct replay_opts *opts, const char *head_name,
  		write_file(rebase_path_gpg_sign_opt(), "-S%s\n", opts->gpg_sign);
  	if (opts->signoff)
  		write_file(rebase_path_signoff(), "--signoff\n");
+	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", "");
@@ -3752,7 +3808,8 @@ 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 6704acbb9c..e3881e9275 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -43,6 +43,7 @@ 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 4342f79eea..7402f7e3da 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/t3433-rebase-options-compatibility.sh b/t/t3433-rebase-options-compatibility.sh
index 2e16e00a9d..6c1fbab4d8 100755
--- a/t/t3433-rebase-options-compatibility.sh
+++ b/t/t3433-rebase-options-compatibility.sh
@@ -7,6 +7,9 @@ test_description='tests to ensure compatibility between am and interactive backe
. ./test-lib.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.
@@ -26,8 +29,13 @@ test_expect_success 'setup' '
  	EOF
  	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 &&
+	git rm --cached foo &&
+	rm foo &&
  	sed -e "s/^|//" >file <<-\EOF &&
  	|line 1
  	|        line 2
@@ -62,4 +70,33 @@ test_expect_success '--ignore-whitespace works with interactive backend' '
  	test_cmp expect file
  '
+test_expect_success '--committer-date-is-author-date works with am backend' '
+	git commit --amend &&
+	git rebase --committer-date-is-author-date HEAD^ &&
+	git show HEAD --pretty="format:%ai" >authortime &&
+	git show HEAD --pretty="format:%ci" >committertime &&
+	test_cmp authortime committertime
+'
+
+test_expect_success '--committer-date-is-author-date works with interactive backend' '
+	git commit --amend &&
+	git rebase -i --committer-date-is-author-date HEAD^ &&
+	git show HEAD --pretty="format:%ai" >authortime &&
+	git show HEAD --pretty="format:%ci" >committertime &&
+	test_cmp authortime committertime
+'
+
+test_expect_success '--committer-date-is-author-date works with rebase -r' '
+	git checkout side &&
+	git merge commit3 &&
+	git rebase -r --root --committer-date-is-author-date &&
+	git rev-list HEAD >rev_list &&
+	while read HASH
+	do
+		git show $HASH --pretty="format:%ai" >authortime
+		git show $HASH --pretty="format:%ci" >committertime
+		test_cmp authortime committertime
+	done <rev_list
+'
+
  test_done




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