Re: [PATCH v2 5/8] sequencer: run post-rewrite hook

[Junio C Hamano <gitster@pobox.com>]

Felipe Contreras <felipe.contreras@gmail.com> writes:

> As we should.
>
> Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
> ---
>  sequencer.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 44 insertions(+), 1 deletion(-)
>
> diff --git a/sequencer.c b/sequencer.c
> index c217716..3aa480e 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -127,6 +127,37 @@ static void add_rewritten(unsigned char *from, unsigned char *to)
>  	rewritten.nr++;
>  }
>  
> +static void run_rewrite_hook(void)
> +{
> +	struct strbuf buf = STRBUF_INIT;
> +	struct child_process proc;
> +	const char *argv[3];
> +	int code, i;
> +
> +	argv[0] = find_hook("post-rewrite");
> +	if (!argv[0])
> +		return;
> +
> +	argv[1] = "rebase";
> +	argv[2] = NULL;

When the end-user action is "git cherry-pick A..B", shouldn't
the rewrite hook be called with "cherry-pick" not "rebase" as its
first argument?

More importantly, doesn't "git revert A..B" also trigger the
codepath for [4/8] and hence this function?

I think [3/8] --skip-empty makes sense also for revert, but I do not
think this one does as-is.  As what [4/8] introduces is a record of
"rewrite", the patch does not make sense either.  These two steps
would want to limit themselves to cherry-pick only, no?

> +	memset(&proc, 0, sizeof(proc));
> +	proc.argv = argv;
> +	proc.in = -1;
> +	proc.stdout_to_stderr = 1;
> +
> +	code = start_command(&proc);
> +	if (code)
> +		return;
> +	for (i = 0; i < rewritten.nr; i++) {
> +		struct rewritten_list_item *item = &rewritten.items[i];
> +		strbuf_addf(&buf, "%s %s\n", sha1_to_hex(item->from), sha1_to_hex(item->to));
> +	}
> +	write_in_full(proc.in, buf.buf, buf.len);
> +	close(proc.in);
> +	finish_command(&proc);
> +}
> +
>  static void remove_sequencer_state(void)
>  {
>  	struct strbuf seq_dir = STRBUF_INIT;
> @@ -1099,6 +1130,8 @@ static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
>  		}
>  	}
>  
> +	run_rewrite_hook();
> +
>  	/*
>  	 * Sequence of picks finished successfully; cleanup by
>  	 * removing the .git/sequencer directory
> @@ -1136,14 +1169,24 @@ static int sequencer_continue(struct replay_opts *opts)
>  	}
>  	if (index_differs_from("HEAD", 0))
>  		return error_dirty_index(opts);
> +	{
> +		unsigned char to[20];
> +		if (!read_ref("HEAD", to))
> +			add_rewritten(todo_list->item->object.sha1, to);
> +	}
>  	todo_list = todo_list->next;
>  	return pick_commits(todo_list, opts);
>  }
>  
>  static int single_pick(struct commit *cmit, struct replay_opts *opts)
>  {
> +	int ret;
>  	setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
> -	return do_pick_commit(cmit, opts);
> +	ret = do_pick_commit(cmit, opts);
> +	if (ret)
> +		return ret;
> +	run_rewrite_hook();
> +	return 0;
>  }
>  
>  int sequencer_pick_revisions(struct replay_opts *opts)