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.

Signed-off-by: Rohit Ashiwal <rohit.ashiwal...@gmail.com>
---
 Documentation/git-rebase.txt            |  7 ++--
 builtin/rebase.c                        | 23 ++++++++++---
 sequencer.c                             | 46 ++++++++++++++++++++++++-
 sequencer.h                             |  1 +
 t/t3422-rebase-incompatible-options.sh  |  1 -
 t/t3431-rebase-options-compatibility.sh | 15 ++++++++
 6 files changed, 84 insertions(+), 9 deletions(-)

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index eda52ed82..ddd111de6 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -383,8 +383,12 @@ default is `--no-fork-point`, otherwise the default is 
`--fork-point`.
 See also INCOMPATIBLE OPTIONS below.
 
 --committer-date-is-author-date::
+       Instead of recording the time the rebased commits are
+       created as the committer date, reuse the author date
+       as the committer date. This implies --force-rebase.
+
 --ignore-date::
-       These flags are passed to 'git am' to easily change the dates
+       This flag is passed to 'git am' to change the author date
        of the rebased commits (see linkgit:git-am[1]).
 +
 See also INCOMPATIBLE OPTIONS below.
@@ -522,7 +526,6 @@ INCOMPATIBLE OPTIONS
 
 The following options:
 
- * --committer-date-is-author-date
  * --ignore-date
  * --whitespace
  * -C
diff --git a/builtin/rebase.c b/builtin/rebase.c
index c55957c31..82a3f7743 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -82,6 +82,7 @@ struct rebase_options {
        int ignore_whitespace;
        char *gpg_sign_opt;
        int autostash;
+       int committer_date_is_author_date;
        char *cmd;
        int allow_empty_message;
        int rebase_merges, rebase_cousins;
@@ -113,6 +114,8 @@ static struct replay_opts get_replay_opts(const struct 
rebase_options *opts)
        replay.allow_empty_message = opts->allow_empty_message;
        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;
        if (opts->strategy_opts)
@@ -467,6 +470,9 @@ int cmd_rebase__interactive(int argc, const char **argv, 
const char *prefix)
                OPT_BOOL(0, "autosquash", &opts.autosquash,
                         N_("move commits that begin with squash!/fixup!")),
                OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
+               OPT_BOOL(0, "committer-date-is-author-date",
+                        &opts.committer_date_is_author_date,
+                        N_("make committer date match author date")),
                OPT_BIT('v', "verbose", &opts.flags,
                        N_("display a diffstat of what changed upstream"),
                        REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
@@ -532,6 +538,9 @@ int cmd_rebase__interactive(int argc, const char **argv, 
const char *prefix)
                warning(_("--[no-]rebase-cousins has no effect without "
                          "--rebase-merges"));
 
+       if (opts.committer_date_is_author_date)
+               opts.flags |= REBASE_FORCE;
+
        return !!run_rebase_interactive(&opts, command);
 }
 
@@ -970,6 +979,8 @@ static int run_am(struct rebase_options *opts)
 
        if (opts->ignore_whitespace)
                argv_array_push(&am.args, "--ignore-whitespace");
+       if (opts->committer_date_is_author_date)
+               argv_array_push(&opts->git_am_opts, 
"--committer-date-is-author-date");
        if (opts->action && !strcmp("continue", opts->action)) {
                argv_array_push(&am.args, "--resolved");
                argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
@@ -1417,9 +1428,9 @@ 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"),
@@ -1686,10 +1697,12 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                    state_dir_base, cmd_live_rebase, buf.buf);
        }
 
+       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"))
                        options.flags |= REBASE_FORCE;
diff --git a/sequencer.c b/sequencer.c
index a2d7b0925..a65f01a42 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")
@@ -876,6 +877,18 @@ 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_die(void)
+{
+       char *date;
+
+       if (read_author_script(rebase_path_author_script(),
+                              NULL, NULL, &date, 0))
+               die(_("failed to read author date"));
+
+       return date;
+}
+
 /* Read author-script and return an ident line (author <email> timestamp) */
 static const char *read_author_ident(struct strbuf *buf)
 {
@@ -986,10 +999,17 @@ static int run_git_commit(struct repository *r,
 
                if (res <= 0)
                        res = error_errno(_("could not read '%s'"), defmsg);
-               else
+               else {
+                       if (opts->committer_date_is_author_date) {
+                               char *date = read_author_date_or_die();
+                               setenv("GIT_COMMITTER_DATE", date, 1);
+                               free(date);
+                       }
+
                        res = commit_tree(msg.buf, msg.len, cache_tree_oid,
                                          NULL, &root_commit, author,
                                          opts->gpg_sign);
+               }
 
                strbuf_release(&msg);
                strbuf_release(&script);
@@ -1019,6 +1039,11 @@ static int run_git_commit(struct repository *r,
                argv_array_push(&cmd.args, "--amend");
        if (opts->gpg_sign)
                argv_array_pushf(&cmd.args, "-S%s", opts->gpg_sign);
+       if (opts->committer_date_is_author_date) {
+               char *date = read_author_date_or_die();
+               argv_array_pushf(&cmd.env_array, "GIT_COMMITTER_DATE=%s", date);
+               free(date);
+       }
        if (defmsg)
                argv_array_pushl(&cmd.args, "-F", defmsg, NULL);
        else if (!(flags & EDIT_MSG))
@@ -1467,6 +1492,12 @@ static int try_to_commit(struct repository *r,
 
        reset_ident_date();
 
+       if (opts->committer_date_is_author_date) {
+               char *date = read_author_date_or_die();
+               setenv("GIT_COMMITTER_DATE", date, 1);
+               free(date);
+       }
+
        if (commit_tree_extended(msg->buf, msg->len, &tree, parents,
                                 oid, author, opts->gpg_sign, extra)) {
                res = error(_("failed to write commit object"));
@@ -2538,6 +2569,11 @@ 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;
 
@@ -2620,6 +2656,8 @@ 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", "");
 
@@ -3437,6 +3475,12 @@ static int do_merge(struct repository *r,
                argv_array_push(&cmd.args, git_path_merge_msg(r));
                if (opts->gpg_sign)
                        argv_array_push(&cmd.args, opts->gpg_sign);
+               if (opts->committer_date_is_author_date) {
+                       char *date = read_author_date_or_die();
+                       argv_array_pushf(&cmd.env_array,
+                                        "GIT_COMMITTER_DATE=%s", date);
+                       free(date);
+               }
 
                /* Add the tips to be merged */
                for (j = to_merge; j; j = j->next)
diff --git a/sequencer.h b/sequencer.h
index 303047a13..0cfe184fc 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -44,6 +44,7 @@ struct replay_opts {
        int quiet;
        int reschedule_failed_exec;
        int ignore_whitespace;
+       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 4342f79ee..7402f7e3d 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/t3431-rebase-options-compatibility.sh 
b/t/t3431-rebase-options-compatibility.sh
index f38ae6f5f..a06d55dfc 100755
--- a/t/t3431-rebase-options-compatibility.sh
+++ b/t/t3431-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 outputs. It was done intentionally because
 # --ignore-whitespace both the backends fall short of optimal
@@ -63,4 +66,16 @@ test_expect_success '--ignore-whitespace works with 
interactive backend' '
        test_cmp expect file
 '
 
+test_expect_success '--committer-date-is-author-date works with interactive 
backend' '
+       git rebase -f HEAD^ &&
+       git cat-file commit HEAD | sed -e "/^\$/q" >head &&
+       sed -ne "/^author /s/.*> //p" head >authortime &&
+       sed -ne "/^committer /s/.*> //p" head >committertime &&
+       ! test_cmp at ct &&
+       git rebase -i --committer-date-is-author-date HEAD^ &&
+       git cat-file commit HEAD | sed -e "/^\$/q" >head &&
+       sed -ne "/^committer /s/.*> //p" head >committertime &&
+       test_cmp authortime committertime
+'
+
 test_done
-- 
2.21.0

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