Re: [PATCH 3/3] status: do not report errors in sequencer/todo

> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>
> commit 4a72486de9 ("fix cherry-pick/revert status after commit",
> 2019-04-16) used parse_insn_line() to parse the first line of the todo
> list to check if it was a pick or revert. However if the todo list is
> left over from an old cherry-pick or revert and references a commit that
> no longer exists then parse_insn_line() prints an error message which is
> confusing for users [1]. Instead parse just the command name so that the
> user is alerted to the presence of stale sequencer state by status
> reporting that a cherry-pick or revert is in progress.
>
> Note that we should not be leaving stale sequencer state lying around
> (or at least not as often) after commit b07d9bfd17 ("commit/reset: try
> to clean up sequencer state", 2019-04-16). However the user may still
> have stale state that predates that commit.
>
> Also avoid printing an error message if for some reason the user has a
> file called `sequencer` in $GIT_DIR.
>
> [1] https://public-inbox.org/git/3bc58c33-4268-4e7c-bf1a-fe349b3cb037@www.fastmail.com/

>
> Reported-by: Espen Antonsen <espen@inspired.no>
> Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
> ---
>  sequencer.c            | 24 ++++++++----------------
>  t/t7512-status-help.sh | 16 ++++++++++++++++
>  2 files changed, 24 insertions(+), 16 deletions(-)
>
> diff --git a/sequencer.c b/sequencer.c
> index 793f86bf9a..f8eab1697e 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -2177,34 +2177,26 @@ static int parse_insn_line(struct repository *r, struct todo_item *item,
>
>  int sequencer_get_last_command(struct repository *r, enum replay_action *action)
>  {
> -	struct todo_item item;
> -	char *eol;
> -	const char *todo_file;
> +	const char *todo_file, *bol;
>  	struct strbuf buf = STRBUF_INIT;
> -	int ret = -1;
> +	int ret = 0;
>
>  	todo_file = git_path_todo_file();
>  	if (strbuf_read_file(&buf, todo_file, 0) < 0) {
> -		if (errno == ENOENT)
> +		if (errno == ENOENT || errno == ENOTDIR)
>  			return -1;
>  		else
>  			return error_errno("unable to open '%s'", todo_file);
>  	}
> -	eol = strchrnul(buf.buf, '\n');
> -	if (buf.buf != eol && eol[-1] == '\r')
> -		eol--; /* strip Carriage Return */
> -	if (parse_insn_line(r, &item, buf.buf, buf.buf, eol))
> -		goto fail;
> -	if (item.command == TODO_PICK)
> +	bol = buf.buf + strspn(buf.buf, " \t\r\n");
> +	if (is_command(TODO_PICK, &bol) && (*bol == ' ' || *bol == '\t'))
>  		*action = REPLAY_PICK;
> -	else if (item.command == TODO_REVERT)
> +	else if (is_command(TODO_REVERT, &bol) &&
> +		 (*bol == ' ' || *bol == '\t'))
>  		*action = REPLAY_REVERT;
>  	else
> -		goto fail;
> -
> -	ret = 0;
> +		ret = -1;
>
> - fail:
>  	strbuf_release(&buf);
>
>  	return ret;
> diff --git a/t/t7512-status-help.sh b/t/t7512-status-help.sh
> index c1eb72555d..3c9308709a 100755
> --- a/t/t7512-status-help.sh
> +++ b/t/t7512-status-help.sh
> @@ -798,6 +798,22 @@ EOF
>  	test_i18ncmp expected actual
>  '
>
> +test_expect_success 'status shows cherry-pick with invalid oid' '
> +	mkdir .git/sequencer &&
> +	test_write_lines "pick invalid-oid" >.git/sequencer/todo &&
> +	git status --untracked-files=no >actual 2>err &&
> +	git cherry-pick --quit &&
> +	test_must_be_empty err &&
> +	test_i18ncmp expected actual
> +'
> +
> +test_expect_success 'status does not show error if .git/sequencer is a file' '
> +	test_when_finished "rm .git/sequencer" &&
> +	test_write_lines hello >.git/sequencer &&
> +	git status --untracked-files=no 2>err &&
> +	test_must_be_empty err
> +'
> +
>  test_expect_success 'status showing detached at and from a tag' '
>  	test_commit atag tagging &&
>  	git checkout atag &&
> --
> gitgitgadget
>