[v4,1/6] rebase -i: add --ignore-whitespace flag
diff mbox series

Message ID 20190907115034.14933-2-rohit.ashiwal265@gmail.com
State New
Headers show
Series
  • rebase -i: support more options
Related show

Commit Message

Rohit Ashiwal Sept. 7, 2019, 11:50 a.m. UTC
There are two backends available for rebasing, viz, the am and the
interactive. Naturally, there shall be some features that are
implemented in one but not in the other. One such flag is
--ignore-whitespace which indicates merge mechanism to treat lines
with only whitespace changes as unchanged. Wire the interactive
rebase to also understand the --ignore-whitespace flag by
translating it to -Xignore-space-change.

Signed-off-by: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
---
 Documentation/git-rebase.txt            | 13 ++++-
 builtin/rebase.c                        | 22 +++++++--
 t/t3422-rebase-incompatible-options.sh  |  1 -
 t/t3433-rebase-options-compatibility.sh | 65 +++++++++++++++++++++++++
 4 files changed, 94 insertions(+), 7 deletions(-)
 create mode 100755 t/t3433-rebase-options-compatibility.sh

Comments

Phillip Wood Oct. 4, 2019, 9:29 a.m. UTC | #1
Hi Rohit

On 07/09/2019 12:50, Rohit Ashiwal wrote:
> There are two backends available for rebasing, viz, the am and the
> interactive. Naturally, there shall be some features that are
> implemented in one but not in the other. One such flag is
> --ignore-whitespace which indicates merge mechanism to treat lines
> with only whitespace changes as unchanged. Wire the interactive
> rebase to also understand the --ignore-whitespace flag by
> translating it to -Xignore-space-change.
> 
> Signed-off-by: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
> ---
>   Documentation/git-rebase.txt            | 13 ++++-
>   builtin/rebase.c                        | 22 +++++++--
>   t/t3422-rebase-incompatible-options.sh  |  1 -
>   t/t3433-rebase-options-compatibility.sh | 65 +++++++++++++++++++++++++
>   4 files changed, 94 insertions(+), 7 deletions(-)
>   create mode 100755 t/t3433-rebase-options-compatibility.sh
> 
> diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
> index 6156609cf7..873eb5768c 100644
> --- a/Documentation/git-rebase.txt
> +++ b/Documentation/git-rebase.txt
> @@ -371,8 +371,16 @@ If either <upstream> or --root is given on the command line, then the
>   default is `--no-fork-point`, otherwise the default is `--fork-point`.
>   
>   --ignore-whitespace::
> +	Behaves differently depending on which backend is selected.
> ++
> +'am' backend: When applying a patch, ignore changes in whitespace in
> +context lines if necessary.
> ++
> +'interactive' backend: Treat lines with only whitespace changes as
> +unchanged for the sake of a three-way merge.
> +
>   --whitespace=<option>::
> -	These flag are passed to the 'git apply' program
> +	This flag is passed to the 'git apply' program
>   	(see linkgit:git-apply[1]) that applies the patch.
>   +
>   See also INCOMPATIBLE OPTIONS below.
> @@ -520,7 +528,6 @@ The following options:
>    * --committer-date-is-author-date
>    * --ignore-date
>    * --whitespace
> - * --ignore-whitespace
>    * -C
>   
>   are incompatible with the following options:
> @@ -543,6 +550,8 @@ In addition, the following pairs of options are incompatible:
>    * --preserve-merges and --interactive
>    * --preserve-merges and --signoff
>    * --preserve-merges and --rebase-merges
> + * --preserve-merges and --ignore-whitespace
> + * --rebase-merges and --ignore-whitespace
>    * --rebase-merges and --strategy
>    * --rebase-merges and --strategy-option
>   
> diff --git a/builtin/rebase.c b/builtin/rebase.c
> index 670096c065..f8a618d54c 100644
> --- a/builtin/rebase.c
> +++ b/builtin/rebase.c
> @@ -79,6 +79,7 @@ struct rebase_options {
>   	int allow_rerere_autoupdate;
>   	int keep_empty;
>   	int autosquash;
> +	int ignore_whitespace;
>   	char *gpg_sign_opt;
>   	int autostash;
>   	char *cmd;
> @@ -99,6 +100,7 @@ struct rebase_options {
>   
>   static struct replay_opts get_replay_opts(const struct rebase_options *opts)
>   {
> +	struct strbuf strategy_buf = STRBUF_INIT;
>   	struct replay_opts replay = REPLAY_OPTS_INIT;
>   
>   	replay.action = REPLAY_INTERACTIVE_REBASE;
> @@ -114,9 +116,15 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
>   	replay.reschedule_failed_exec = opts->reschedule_failed_exec;
>   	replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
>   	replay.strategy = opts->strategy;
> +
>   	if (opts->strategy_opts)
> -		parse_strategy_opts(&replay, opts->strategy_opts);
> +		strbuf_addstr(&strategy_buf, opts->strategy_opts);
> +	if (opts->ignore_whitespace)
> +		strbuf_addstr(&strategy_buf, " --ignore-space-change");
> +	if (strategy_buf.len)
> +		parse_strategy_opts(&replay, strategy_buf.buf);
>   
> +	strbuf_release(&strategy_buf);
>   	return replay;
>   }
>   
> @@ -511,6 +519,8 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
>   	argc = parse_options(argc, argv, prefix, options,
>   			builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
>   
> +	opts.strategy_opts = xstrdup_or_null(opts.strategy_opts);
> +
>   	if (!is_null_oid(&squash_onto))
>   		opts.squash_onto = &squash_onto;
>   
> @@ -964,6 +974,8 @@ static int run_am(struct rebase_options *opts)
>   	am.git_cmd = 1;
>   	argv_array_push(&am.args, "am");
>   
> +	if (opts->ignore_whitespace)
> +		argv_array_push(&am.args, "--ignore-whitespace");
>   	if (opts->action && !strcmp("continue", opts->action)) {
>   		argv_array_push(&am.args, "--resolved");
>   		argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
> @@ -1407,9 +1419,6 @@ 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, "ignore-whitespace", &options.git_am_opts,
> -				  NULL, N_("passed to 'git am'"),
> -				  PARSE_OPT_NOARG),
>   		OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
>   				  &options.git_am_opts, NULL,
>   				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
> @@ -1417,6 +1426,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>   				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
>   		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
>   				  N_("passed to 'git apply'"), 0),
> +		OPT_BOOL(0, "ignore-whitespace", &options.ignore_whitespace,
> +			 N_("ignore changes in whitespace")),
>   		OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
>   				  N_("action"), N_("passed to 'git apply'"), 0),
>   		OPT_BIT('f', "force-rebase", &options.flags,
> @@ -1834,6 +1845,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>   	}
>   
>   	if (options.rebase_merges) {
> +		if (options.ignore_whitespace)
> +			die(_("cannot combine '--rebase-merges' with "
> +			      "'--ignore-whitespace'"));

--rebase-merges now supports --strategy_option so we should fix this.

>   		if (strategy_options.nr)
>   			die(_("cannot combine '--rebase-merges' with "
>   			      "'--strategy-option'"));
> diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
> index a5868ea152..4342f79eea 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 --ignore-whitespace
>   test_rebase_am_only --committer-date-is-author-date
>   test_rebase_am_only -C4
>   
> diff --git a/t/t3433-rebase-options-compatibility.sh b/t/t3433-rebase-options-compatibility.sh
> new file mode 100755
> index 0000000000..2e16e00a9d
> --- /dev/null
> +++ b/t/t3433-rebase-options-compatibility.sh
> @@ -0,0 +1,65 @@
> +#!/bin/sh
> +#
> +# Copyright (c) 2019 Rohit Ashiwal
> +#
> +
> +test_description='tests to ensure compatibility between am and interactive backends'
> +
> +. ./test-lib.sh
> +
> +# This is a special case in which both am and interactive backends
> +# provide the same output. 

I'm still concerned that we have to construct a special test case to get 
both backends to generate the same output. If this series is about 
supporting the behavior of the am backend in the sequencer then I'm 
worried that having the same option name have two different behaviors 
will create more problems than it solves. Do you have a feeling for how 
often the two backends give different results?

Best Wishes

Phillip

It was done intentionally because
> +# both the backends fall short of optimal behaviour.
> +test_expect_success 'setup' '
> +	git checkout -b topic &&
> +	q_to_tab >file <<-\EOF &&
> +	line 1
> +	Qline 2
> +	line 3
> +	EOF
> +	git add file &&
> +	git commit -m "add file" &&
> +	cat >file <<-\EOF &&
> +	line 1
> +	new line 2
> +	line 3
> +	EOF
> +	git commit -am "update file" &&
> +	git tag side &&
> +
> +	git checkout --orphan master &&
> +	sed -e "s/^|//" >file <<-\EOF &&
> +	|line 1
> +	|        line 2
> +	|line 3
> +	EOF
> +	git add file &&
> +	git commit -m "add file" &&
> +	git tag main
> +'
> +
> +test_expect_success '--ignore-whitespace works with am backend' '
> +	cat >expect <<-\EOF &&
> +	line 1
> +	new line 2
> +	line 3
> +	EOF
> +	test_must_fail git rebase main side &&
> +	git rebase --abort &&
> +	git rebase --ignore-whitespace main side &&
> +	test_cmp expect file
> +'
> +
> +test_expect_success '--ignore-whitespace works with interactive backend' '
> +	cat >expect <<-\EOF &&
> +	line 1
> +	new line 2
> +	line 3
> +	EOF
> +	test_must_fail git rebase --merge main side &&
> +	git rebase --abort &&
> +	git rebase --merge --ignore-whitespace main side &&
> +	test_cmp expect file
> +'
> +
> +test_done
>
Elijah Newren Oct. 5, 2019, 6:12 p.m. UTC | #2
On Fri, Oct 4, 2019 at 2:29 AM Phillip Wood <phillip.wood123@gmail.com> wrote:
>
> Hi Rohit
>
> On 07/09/2019 12:50, Rohit Ashiwal wrote:
> > There are two backends available for rebasing, viz, the am and the
> > interactive. Naturally, there shall be some features that are
> > implemented in one but not in the other. One such flag is
> > --ignore-whitespace which indicates merge mechanism to treat lines
> > with only whitespace changes as unchanged. Wire the interactive
> > rebase to also understand the --ignore-whitespace flag by
> > translating it to -Xignore-space-change.
> >
> > Signed-off-by: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
> > ---
> >   Documentation/git-rebase.txt            | 13 ++++-
> >   builtin/rebase.c                        | 22 +++++++--
> >   t/t3422-rebase-incompatible-options.sh  |  1 -
> >   t/t3433-rebase-options-compatibility.sh | 65 +++++++++++++++++++++++++
> >   4 files changed, 94 insertions(+), 7 deletions(-)
> >   create mode 100755 t/t3433-rebase-options-compatibility.sh
> >
> > diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
> > index 6156609cf7..873eb5768c 100644
> > --- a/Documentation/git-rebase.txt
> > +++ b/Documentation/git-rebase.txt
> > @@ -371,8 +371,16 @@ If either <upstream> or --root is given on the command line, then the
> >   default is `--no-fork-point`, otherwise the default is `--fork-point`.
> >
> >   --ignore-whitespace::
> > +     Behaves differently depending on which backend is selected.
> > ++
> > +'am' backend: When applying a patch, ignore changes in whitespace in
> > +context lines if necessary.
> > ++
> > +'interactive' backend: Treat lines with only whitespace changes as
> > +unchanged for the sake of a three-way merge.
> > +
> >   --whitespace=<option>::
> > -     These flag are passed to the 'git apply' program
> > +     This flag is passed to the 'git apply' program
> >       (see linkgit:git-apply[1]) that applies the patch.
> >   +
> >   See also INCOMPATIBLE OPTIONS below.
> > @@ -520,7 +528,6 @@ The following options:
> >    * --committer-date-is-author-date
> >    * --ignore-date
> >    * --whitespace
> > - * --ignore-whitespace
> >    * -C
> >
> >   are incompatible with the following options:
> > @@ -543,6 +550,8 @@ In addition, the following pairs of options are incompatible:
> >    * --preserve-merges and --interactive
> >    * --preserve-merges and --signoff
> >    * --preserve-merges and --rebase-merges
> > + * --preserve-merges and --ignore-whitespace
> > + * --rebase-merges and --ignore-whitespace
> >    * --rebase-merges and --strategy
> >    * --rebase-merges and --strategy-option
> >
> > diff --git a/builtin/rebase.c b/builtin/rebase.c
> > index 670096c065..f8a618d54c 100644
> > --- a/builtin/rebase.c
> > +++ b/builtin/rebase.c
> > @@ -79,6 +79,7 @@ struct rebase_options {
> >       int allow_rerere_autoupdate;
> >       int keep_empty;
> >       int autosquash;
> > +     int ignore_whitespace;
> >       char *gpg_sign_opt;
> >       int autostash;
> >       char *cmd;
> > @@ -99,6 +100,7 @@ struct rebase_options {
> >
> >   static struct replay_opts get_replay_opts(const struct rebase_options *opts)
> >   {
> > +     struct strbuf strategy_buf = STRBUF_INIT;
> >       struct replay_opts replay = REPLAY_OPTS_INIT;
> >
> >       replay.action = REPLAY_INTERACTIVE_REBASE;
> > @@ -114,9 +116,15 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
> >       replay.reschedule_failed_exec = opts->reschedule_failed_exec;
> >       replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
> >       replay.strategy = opts->strategy;
> > +
> >       if (opts->strategy_opts)
> > -             parse_strategy_opts(&replay, opts->strategy_opts);
> > +             strbuf_addstr(&strategy_buf, opts->strategy_opts);
> > +     if (opts->ignore_whitespace)
> > +             strbuf_addstr(&strategy_buf, " --ignore-space-change");
> > +     if (strategy_buf.len)
> > +             parse_strategy_opts(&replay, strategy_buf.buf);
> >
> > +     strbuf_release(&strategy_buf);
> >       return replay;
> >   }
> >
> > @@ -511,6 +519,8 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
> >       argc = parse_options(argc, argv, prefix, options,
> >                       builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
> >
> > +     opts.strategy_opts = xstrdup_or_null(opts.strategy_opts);
> > +
> >       if (!is_null_oid(&squash_onto))
> >               opts.squash_onto = &squash_onto;
> >
> > @@ -964,6 +974,8 @@ static int run_am(struct rebase_options *opts)
> >       am.git_cmd = 1;
> >       argv_array_push(&am.args, "am");
> >
> > +     if (opts->ignore_whitespace)
> > +             argv_array_push(&am.args, "--ignore-whitespace");
> >       if (opts->action && !strcmp("continue", opts->action)) {
> >               argv_array_push(&am.args, "--resolved");
> >               argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
> > @@ -1407,9 +1419,6 @@ 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, "ignore-whitespace", &options.git_am_opts,
> > -                               NULL, N_("passed to 'git am'"),
> > -                               PARSE_OPT_NOARG),
> >               OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
> >                                 &options.git_am_opts, NULL,
> >                                 N_("passed to 'git am'"), PARSE_OPT_NOARG),
> > @@ -1417,6 +1426,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
> >                                 N_("passed to 'git am'"), PARSE_OPT_NOARG),
> >               OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
> >                                 N_("passed to 'git apply'"), 0),
> > +             OPT_BOOL(0, "ignore-whitespace", &options.ignore_whitespace,
> > +                      N_("ignore changes in whitespace")),
> >               OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
> >                                 N_("action"), N_("passed to 'git apply'"), 0),
> >               OPT_BIT('f', "force-rebase", &options.flags,
> > @@ -1834,6 +1845,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
> >       }
> >
> >       if (options.rebase_merges) {
> > +             if (options.ignore_whitespace)
> > +                     die(_("cannot combine '--rebase-merges' with "
> > +                           "'--ignore-whitespace'"));
>
> --rebase-merges now supports --strategy_option so we should fix this.
>
> >               if (strategy_options.nr)
> >                       die(_("cannot combine '--rebase-merges' with "
> >                             "'--strategy-option'"));
> > diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
> > index a5868ea152..4342f79eea 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 --ignore-whitespace
> >   test_rebase_am_only --committer-date-is-author-date
> >   test_rebase_am_only -C4
> >
> > diff --git a/t/t3433-rebase-options-compatibility.sh b/t/t3433-rebase-options-compatibility.sh
> > new file mode 100755
> > index 0000000000..2e16e00a9d
> > --- /dev/null
> > +++ b/t/t3433-rebase-options-compatibility.sh
> > @@ -0,0 +1,65 @@
> > +#!/bin/sh
> > +#
> > +# Copyright (c) 2019 Rohit Ashiwal
> > +#
> > +
> > +test_description='tests to ensure compatibility between am and interactive backends'
> > +
> > +. ./test-lib.sh
> > +
> > +# This is a special case in which both am and interactive backends
> > +# provide the same output.
>
> I'm still concerned that we have to construct a special test case to get
> both backends to generate the same output. If this series is about
> supporting the behavior of the am backend in the sequencer then I'm
> worried that having the same option name have two different behaviors
> will create more problems than it solves. Do you have a feeling for how
> often the two backends give different results?

I think the wording choice of "special case" was unfortunate; it's
actually a common case.  Most the time the two backends will give the
same results, it's only in special cases that they don't.  See
https://public-inbox.org/git/CABPp-BE+D-GFJaucgCCsBA8E7nQAxc0vNE92HaCpOTQrUp=mPA@mail.gmail.com/
Rohit Ashiwal Oct. 6, 2019, 5:57 p.m. UTC | #3
Hi Phillip

On Fri, 4 Oct 2019 10:29:36 +0100 Phillip Wood <phillip.wood123@gmail.com> wrote:
>
> [...]
> --rebase-merges now supports --strategy_option so we should fix this.

Yes, now that it supports --strategy_options I'll remove it from
here.

> [...]


Thanks
Rohit

Patch
diff mbox series

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index 6156609cf7..873eb5768c 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -371,8 +371,16 @@  If either <upstream> or --root is given on the command line, then the
 default is `--no-fork-point`, otherwise the default is `--fork-point`.
 
 --ignore-whitespace::
+	Behaves differently depending on which backend is selected.
++
+'am' backend: When applying a patch, ignore changes in whitespace in
+context lines if necessary.
++
+'interactive' backend: Treat lines with only whitespace changes as
+unchanged for the sake of a three-way merge.
+
 --whitespace=<option>::
-	These flag are passed to the 'git apply' program
+	This flag is passed to the 'git apply' program
 	(see linkgit:git-apply[1]) that applies the patch.
 +
 See also INCOMPATIBLE OPTIONS below.
@@ -520,7 +528,6 @@  The following options:
  * --committer-date-is-author-date
  * --ignore-date
  * --whitespace
- * --ignore-whitespace
  * -C
 
 are incompatible with the following options:
@@ -543,6 +550,8 @@  In addition, the following pairs of options are incompatible:
  * --preserve-merges and --interactive
  * --preserve-merges and --signoff
  * --preserve-merges and --rebase-merges
+ * --preserve-merges and --ignore-whitespace
+ * --rebase-merges and --ignore-whitespace
  * --rebase-merges and --strategy
  * --rebase-merges and --strategy-option
 
diff --git a/builtin/rebase.c b/builtin/rebase.c
index 670096c065..f8a618d54c 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -79,6 +79,7 @@  struct rebase_options {
 	int allow_rerere_autoupdate;
 	int keep_empty;
 	int autosquash;
+	int ignore_whitespace;
 	char *gpg_sign_opt;
 	int autostash;
 	char *cmd;
@@ -99,6 +100,7 @@  struct rebase_options {
 
 static struct replay_opts get_replay_opts(const struct rebase_options *opts)
 {
+	struct strbuf strategy_buf = STRBUF_INIT;
 	struct replay_opts replay = REPLAY_OPTS_INIT;
 
 	replay.action = REPLAY_INTERACTIVE_REBASE;
@@ -114,9 +116,15 @@  static struct replay_opts get_replay_opts(const struct rebase_options *opts)
 	replay.reschedule_failed_exec = opts->reschedule_failed_exec;
 	replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
 	replay.strategy = opts->strategy;
+
 	if (opts->strategy_opts)
-		parse_strategy_opts(&replay, opts->strategy_opts);
+		strbuf_addstr(&strategy_buf, opts->strategy_opts);
+	if (opts->ignore_whitespace)
+		strbuf_addstr(&strategy_buf, " --ignore-space-change");
+	if (strategy_buf.len)
+		parse_strategy_opts(&replay, strategy_buf.buf);
 
+	strbuf_release(&strategy_buf);
 	return replay;
 }
 
@@ -511,6 +519,8 @@  int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, options,
 			builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
 
+	opts.strategy_opts = xstrdup_or_null(opts.strategy_opts);
+
 	if (!is_null_oid(&squash_onto))
 		opts.squash_onto = &squash_onto;
 
@@ -964,6 +974,8 @@  static int run_am(struct rebase_options *opts)
 	am.git_cmd = 1;
 	argv_array_push(&am.args, "am");
 
+	if (opts->ignore_whitespace)
+		argv_array_push(&am.args, "--ignore-whitespace");
 	if (opts->action && !strcmp("continue", opts->action)) {
 		argv_array_push(&am.args, "--resolved");
 		argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
@@ -1407,9 +1419,6 @@  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, "ignore-whitespace", &options.git_am_opts,
-				  NULL, N_("passed to 'git am'"),
-				  PARSE_OPT_NOARG),
 		OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
 				  &options.git_am_opts, NULL,
 				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
@@ -1417,6 +1426,8 @@  int cmd_rebase(int argc, const char **argv, const char *prefix)
 				  N_("passed to 'git am'"), PARSE_OPT_NOARG),
 		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
 				  N_("passed to 'git apply'"), 0),
+		OPT_BOOL(0, "ignore-whitespace", &options.ignore_whitespace,
+			 N_("ignore changes in whitespace")),
 		OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
 				  N_("action"), N_("passed to 'git apply'"), 0),
 		OPT_BIT('f', "force-rebase", &options.flags,
@@ -1834,6 +1845,9 @@  int cmd_rebase(int argc, const char **argv, const char *prefix)
 	}
 
 	if (options.rebase_merges) {
+		if (options.ignore_whitespace)
+			die(_("cannot combine '--rebase-merges' with "
+			      "'--ignore-whitespace'"));
 		if (strategy_options.nr)
 			die(_("cannot combine '--rebase-merges' with "
 			      "'--strategy-option'"));
diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
index a5868ea152..4342f79eea 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 --ignore-whitespace
 test_rebase_am_only --committer-date-is-author-date
 test_rebase_am_only -C4
 
diff --git a/t/t3433-rebase-options-compatibility.sh b/t/t3433-rebase-options-compatibility.sh
new file mode 100755
index 0000000000..2e16e00a9d
--- /dev/null
+++ b/t/t3433-rebase-options-compatibility.sh
@@ -0,0 +1,65 @@ 
+#!/bin/sh
+#
+# Copyright (c) 2019 Rohit Ashiwal
+#
+
+test_description='tests to ensure compatibility between am and interactive backends'
+
+. ./test-lib.sh
+
+# 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.
+test_expect_success 'setup' '
+	git checkout -b topic &&
+	q_to_tab >file <<-\EOF &&
+	line 1
+	Qline 2
+	line 3
+	EOF
+	git add file &&
+	git commit -m "add file" &&
+	cat >file <<-\EOF &&
+	line 1
+	new line 2
+	line 3
+	EOF
+	git commit -am "update file" &&
+	git tag side &&
+
+	git checkout --orphan master &&
+	sed -e "s/^|//" >file <<-\EOF &&
+	|line 1
+	|        line 2
+	|line 3
+	EOF
+	git add file &&
+	git commit -m "add file" &&
+	git tag main
+'
+
+test_expect_success '--ignore-whitespace works with am backend' '
+	cat >expect <<-\EOF &&
+	line 1
+	new line 2
+	line 3
+	EOF
+	test_must_fail git rebase main side &&
+	git rebase --abort &&
+	git rebase --ignore-whitespace main side &&
+	test_cmp expect file
+'
+
+test_expect_success '--ignore-whitespace works with interactive backend' '
+	cat >expect <<-\EOF &&
+	line 1
+	new line 2
+	line 3
+	EOF
+	test_must_fail git rebase --merge main side &&
+	git rebase --abort &&
+	git rebase --merge --ignore-whitespace main side &&
+	test_cmp expect file
+'
+
+test_done