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Re: [GSoC][PATCH v2 1/6] rebase -i: add --ignore-whitespace flag

From
PWPhillip Wood <phillip.wood123@gmail.com>
Date
Aug 13, 2019, 12:07 UTC
Message-ID
<a505fdf3-5926-9765-21ef-b82334a3fba4@gmail.com>
In-Reply-To
<20190812194301.5655-2-rohit.ashiwal265@gmail.com>
Hi Rohit
Thanks for the re-roll
On 12/08/2019 20:42, Rohit Ashiwal wrote:
Show 29 quoted lines
> 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            | 10 +++-
>   builtin/rebase.c                        | 29 +++++++++--
>   t/t3422-rebase-incompatible-options.sh  |  1 -
>   t/t3433-rebase-options-compatibility.sh | 65 +++++++++++++++++++++++++
>   4 files changed, 97 insertions(+), 8 deletions(-)
>   create mode 100755 t/t3433-rebase-options-compatibility.sh
> 
> diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
> index 6156609cf7..28e5e08a83 100644
> --- a/Documentation/git-rebase.txt
> +++ b/Documentation/git-rebase.txt
> @@ -371,8 +371,13 @@ 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::
> +	This flag is either passed to the 'git apply' program
> +	(see linkgit:git-apply[1]), or to 'git merge' program
> +	(see linkgit:git-merge[1]) as `-Xignore-space-change`,
> +	depending on which backend is selected by other options.

I still think this should document what it does rather than how it is implemented - see my previous comments.

Show 41 quoted lines
> +
>   --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 +525,6 @@ The following options:
>    * --committer-date-is-author-date
>    * --ignore-date
>    * --whitespace
> - * --ignore-whitespace
>    * -C
>   
>   are incompatible with the following options:
> @@ -543,6 +547,8 @@ 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..ab1bbb78ee 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)
>   {
> +	char *strategy_opts = opts->strategy_opts;

strategy_opts is a shallow copy of opts->strategy_opts - this will cause problems later

Show 15 quoted lines
>   	struct replay_opts replay = REPLAY_OPTS_INIT;
>   
>   	replay.action = REPLAY_INTERACTIVE_REBASE;
> @@ -114,8 +116,19 @@ 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);
> +
> +	if (opts->ignore_whitespace) {
> +		struct strbuf buf = STRBUF_INIT;
> +
> +		if (strategy_opts)
> +			strbuf_addstr(&buf, strategy_opts);
I'd rewrite this as
	if (opts->strategy_opts)
		strbuf_addstr(&buf, opts->strategy_opts);
without the outer if testing opts->ignore_whitespace
> +
then add
	if (opts->ignore_whitespace)
here
> +		strbuf_addstr(&buf, " --ignore-space-change");
> +		free(strategy_opts);

and then you don't need this free() or strategy_opts. At the moment this has freed opts->stragety_opts which is what we were trying to avoid, in fact it's slightly worse than the last version because we don't change opts->strategy_opts to reflect the fact it has been freed. Also the caller cannot know if it has been freed as it depends what other options are set.

> +		strategy_opts = strbuf_detach(&buf, NULL);
> +	}
> +	if (strategy_opts)
> +		parse_strategy_opts(&replay, strategy_opts);
replace this withe
	if (buf.len)
		parse_strategy_opts(&replay, buf.buf);
	strbuf_release(&buf);

This way we never change opts->strategy_opts and we always release the temporary copy.

Best Wishes
Phillip
Show 134 quoted lines
>   
>   	return replay;
>   }
> @@ -511,6 +524,8 @@ 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 +979,8 @@ 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 +1424,6 @@ 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 +1431,8 @@ 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 +1850,9 @@ 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
>
Previous: Rohit AshiwalNext: Rohit Ashiwal
Message 23 of 96 in “[GSoC][PATCHl 0/6] rebase -i: support more options”
  1. Rohit AshiwalAug 6, 2019
  2. [GSoC][PATCHl 1/6] rebase -i: add --ignore-whitespace flagRohit Ashiwal, Aug 6, 2019
  3. Junio C HamanoAug 7, 2019
  4. Rohit AshiwalAug 7, 2019
  5. Phillip WoodAug 8, 2019
  6. Rohit AshiwalAug 12, 2019
  7. [GSoC][PATCHl 3/6] rebase -i: support --committer-date-is-author-dateRohit Ashiwal, Aug 6, 2019
  8. Phillip WoodAug 8, 2019
  9. Junio C HamanoAug 8, 2019
  10. [GSoC][PATCHl 2/6] sequencer: add NULL checks under read_author_scriptRohit Ashiwal, Aug 6, 2019
  11. [GSoC][PATCHl 4/6] sequencer: rename amend_author to author_to_renameRohit Ashiwal, Aug 6, 2019
  12. Phillip WoodAug 8, 2019
  13. [GSoC][PATCHl 5/6] rebase -i: support --ignore-dateRohit Ashiwal, Aug 6, 2019
  14. Johannes SchindelinAug 7, 2019
  15. Junio C HamanoAug 7, 2019
  16. Rohit AshiwalAug 7, 2019
  17. Phillip WoodAug 8, 2019
  18. Phillip WoodAug 8, 2019
  19. [GSoC][PATCHl 6/6] rebase: add --author-date-is-committer-dateRohit Ashiwal, Aug 6, 2019
  20. Phillip WoodAug 8, 2019
  21. [GSoC][PATCH v2 0/6] rebase -i: support more optionsRohit Ashiwal, Aug 12, 2019
  22. [GSoC][PATCH v2 1/6] rebase -i: add --ignore-whitespace flagRohit Ashiwal, Aug 12, 2019
  23. Phillip WoodAug 13, 2019
  24. [GSoC][PATCH v2 2/6] sequencer: add NULL checks under read_author_scriptRohit Ashiwal, Aug 12, 2019
  25. [GSoC][PATCH v2 3/6] rebase -i: support --committer-date-is-author-dateRohit Ashiwal, Aug 12, 2019
  26. Phillip WoodAug 13, 2019
  27. Phillip WoodAug 13, 2019
  28. Junio C HamanoAug 13, 2019
  29. Phillip WoodAug 14, 2019
  30. Phillip WoodAug 13, 2019
  31. [GSoC][PATCH v2 4/6] sequencer: rename amend_author to author_to_renameRohit Ashiwal, Aug 12, 2019
  32. Phillip WoodAug 13, 2019
  33. [GSoC][PATCH v2 5/6] rebase -i: support --ignore-dateRohit Ashiwal, Aug 12, 2019
  34. Phillip WoodAug 13, 2019
  35. Junio C HamanoAug 13, 2019
  36. Phillip WoodAug 14, 2019
  37. Junio C HamanoAug 13, 2019
  38. Phillip WoodAug 14, 2019
  39. Junio C HamanoAug 14, 2019
  40. Phillip WoodAug 17, 2019
  41. [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-dateRohit Ashiwal, Aug 12, 2019
  42. Junio C HamanoAug 13, 2019
  43. 0/6 rebase -i: support more optionsRohit Ashiwal, Aug 20, 2019
  44. 1/6 rebase -i: add --ignore-whitespace flagRohit Ashiwal, Aug 20, 2019
  45. Phillip WoodAug 20, 2019
  46. Rohit AshiwalAug 20, 2019
  47. 2/6 sequencer: add NULL checks under read_author_scriptRohit Ashiwal, Aug 20, 2019
  48. Junio C HamanoAug 23, 2019
  49. 3/6 rebase -i: support --committer-date-is-author-dateRohit Ashiwal, Aug 20, 2019
  50. Phillip WoodAug 20, 2019
  51. 4/6 sequencer: rename amend_author to author_to_renameRohit Ashiwal, Aug 20, 2019
  52. 5/6 rebase -i: support --ignore-dateRohit Ashiwal, Aug 20, 2019
  53. Phillip WoodAug 20, 2019
  54. Junio C HamanoAug 20, 2019
  55. Phillip WoodAug 20, 2019
  56. [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-dateRohit Ashiwal, Aug 20, 2019
  57. Rohit AshiwalAug 20, 2019
  58. 6/6 rebase: add --reset-author-dateRohit Ashiwal, Aug 20, 2019
  59. Rohit AshiwalAug 20, 2019
  60. Phillip WoodAug 20, 2019
  61. Junio C HamanoAug 20, 2019
  62. Phillip WoodAug 20, 2019
  63. 0/6 rebase -i: support more optionsRohit Ashiwal, Sep 7, 2019
  64. 1/6 rebase -i: add --ignore-whitespace flagRohit Ashiwal, Sep 7, 2019
  65. Phillip WoodOct 4, 2019
  66. Elijah NewrenOct 5, 2019
  67. Rohit AshiwalOct 6, 2019
  68. 2/6 sequencer: allow callers of read_author_script() to ignore fieldsRohit Ashiwal, Sep 7, 2019
  69. 3/6 rebase -i: support --committer-date-is-author-dateRohit Ashiwal, Sep 7, 2019
  70. Phillip WoodOct 4, 2019
  71. Rohit AshiwalOct 6, 2019
  72. Phillip WoodOct 24, 2019
  73. 4/6 sequencer: rename amend_author to author_to_renameRohit Ashiwal, Sep 7, 2019
  74. 5/6 rebase -i: support --ignore-dateRohit Ashiwal, Sep 7, 2019
  75. Rohit AshiwalSep 7, 2019
  76. Phillip WoodSep 27, 2019
  77. Rohit AshiwalOct 6, 2019
  78. Phillip WoodOct 24, 2019
  79. 6/6 rebase: add --reset-author-dateRohit Ashiwal, Sep 7, 2019
  80. Junio C HamanoSep 9, 2019
  81. Phillip WoodSep 9, 2019
  82. Junio C HamanoSep 9, 2019
  83. 0/6 rebase -i: support more optionsRohit Ashiwal, Nov 1, 2019
  84. 1/6 rebase -i: add --ignore-whitespace flagRohit Ashiwal, Nov 1, 2019
  85. 2/6 sequencer: allow callers of read_author_script() to ignore fieldsRohit Ashiwal, Nov 1, 2019
  86. 3/6 rebase -i: support --committer-date-is-author-dateRohit Ashiwal, Nov 1, 2019
  87. 4/6 sequencer: rename amend_author to author_to_renameRohit Ashiwal, Nov 1, 2019
  88. 5/6 rebase -i: support --ignore-dateRohit Ashiwal, Nov 1, 2019
  89. Junio C HamanoNov 2, 2019
  90. Junio C HamanoNov 2, 2019
  91. 6/6 rebase: add --reset-author-dateRohit Ashiwal, Nov 1, 2019
  92. Junio C HamanoNov 2, 2019
  93. Junio C HamanoNov 21, 2019
  94. Alban GruinNov 21, 2019
  95. Junio C HamanoNov 22, 2019
  96. Phillip WoodNov 28, 2019

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