From: Phillip Wood <phillip.wood123@gmail.com>
To: Alban Gruin <alban.gruin@gmail.com>, git@vger.kernel.org
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
Phillip Wood <phillip.wood@dunelm.org.uk>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v4 2/2] rebase-interactive: warn if commit is dropped with `rebase --edit-todo'
Date: Sun, 19 Jan 2020 16:28:49 +0000 [thread overview]
Message-ID: <fa4cecb1-4b42-d75b-e1e4-e0fa3bd13c6a@gmail.com> (raw)
In-Reply-To: <20200111173917.15690-3-alban.gruin@gmail.com>
Hi Alban
On 11/01/2020 17:39, Alban Gruin wrote:
> When set to "warn" or "error", `rebase.missingCommitsCheck' would make
> `rebase -i' warn if the user removed commits from the todo list to
> prevent mistakes. Unfortunately, `rebase --edit-todo' and `rebase
> --continue' don't take it into account.
>
> This adds the ability for `rebase --edit-todo' and `rebase --continue'
> to check if commits were dropped by the user. As both edit_todo_list()
> and complete_action() parse the todo list and check for dropped commits,
> the code doing so in the latter is removed to reduce duplication.
> `edit_todo_list_advice' is removed from sequencer.c as it is no longer
> used there.
>
> This changes when a backup of the todo list is made. Until now, it
> was saved only once, before the initial edit. Now, it is also made if
> after the user edited the list, if it has no errors or if no commits
> were dropped and `rebase.missingCommitsCheck' is set. Thus, the
> backup should be error-free. Without this, sequencer_continue()
> (`rebase --continue') could only compare the current todo list against
> the original, unedited list. Before this change, this file was only
> used by edit_todo_list() and `rebase -p' to create the backup before
> the initial edit, and check_todo_list_from_file(), only used by
> `rebase -p' to check for dropped commits after its own initial edit.
>
> If the edited list has an error, a file, `dropped', is created to
> report the issue. Otherwise, it is deleted. Usually, the edited list
> is compared against the list before editing, but if this file exists,
> it will be compared to the backup. Also, if the file exists,
> sequencer_continue() checks the list for dropped commits. If the
> check was performed every time, it would fail when resuming a rebase
> after resolving a conflict, as the backup will contain commits that
> were picked, but they will not be in the new list. It's safe to
> ignore this check if `dropped' does not exist, because that means that
> no errors were found at the last edition, so any missing commits here
> have already been picked.
>
> Four tests are added to t3404. The tests for
> `rebase.missingCommitsCheck = warn' and `rebase.missingCommitsCheck =
> error' have a similar structure. First, we start a rebase with an
> incorrect command on the first line. Then, we edit the todo list,
> removing the first and the last lines. This demonstrates that
> `--edit-todo' notices dropped commits, but not when the command is
> incorrect. Then, we restore the original todo list, and edit it to
> remove the last line. This demonstrates that if we add a commit after
> the initial edit, then remove it, `--edit-todo' will notice that it
> has been dropped. Then, the actual rebase takes place. In the third
> test, it is also checked that `--continue' will refuse to resume the
> rebase if commits were dropped. The fourth test checks that no errors
> are raised when resuming a rebase after resolving a conflict.
>
> Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
> ---
>
> Notes:
> I don't think the way I create `expect.3' files in "rebase --edit-todo
> respects rebase.missingCommitsCheck = warning" & "... = error" is the
> best practice. Perhaps I should create a new file from scratch instead
> of calling `head' and `tail' successively?
>
> rebase-interactive.c | 58 ++++++++++++++----
> rebase-interactive.h | 3 +
> sequencer.c | 22 +++----
> sequencer.h | 1 +
> t/t3404-rebase-interactive.sh | 109 ++++++++++++++++++++++++++++++++++
> 5 files changed, 171 insertions(+), 22 deletions(-)
>
> diff --git a/rebase-interactive.c b/rebase-interactive.c
> index ad5dd49c31..36b08a55ef 100644
> --- a/rebase-interactive.c
> +++ b/rebase-interactive.c
> @@ -5,6 +5,7 @@
> #include "strbuf.h"
> #include "commit-slab.h"
> #include "config.h"
> +#include "dir.h"
>
> static const char edit_todo_list_advice[] =
> N_("You can fix this with 'git rebase --edit-todo' "
> @@ -97,22 +98,25 @@ int edit_todo_list(struct repository *r, struct todo_list *todo_list,
> struct todo_list *new_todo, const char *shortrevisions,
> const char *shortonto, unsigned flags)
> {
> - const char *todo_file = rebase_path_todo();
> + const char *todo_file = rebase_path_todo(),
> + *todo_backup = rebase_path_todo_backup();
> unsigned initial = shortrevisions && shortonto;
> + int incorrect = 1;
>
> /* If the user is editing the todo list, we first try to parse
> * it. If there is an error, we do not return, because the user
> * might want to fix it in the first place. */
> if (!initial)
> - todo_list_parse_insn_buffer(r, todo_list->buf.buf, todo_list);
> + incorrect = todo_list_parse_insn_buffer(r, todo_list->buf.buf, todo_list);
> +
> + incorrect |= file_exists(rebase_path_dropped());
>
> if (todo_list_write_to_file(r, todo_list, todo_file, shortrevisions, shortonto,
> -1, flags | TODO_LIST_SHORTEN_IDS | TODO_LIST_APPEND_TODO_HELP))
> return error_errno(_("could not write '%s'"), todo_file);
>
> - if (initial && copy_file(rebase_path_todo_backup(), todo_file, 0666))
> - return error(_("could not copy '%s' to '%s'."), todo_file,
> - rebase_path_todo_backup());
> + if (initial && copy_file(todo_backup, todo_file, 0666))
> + return error(_("could not copy '%s' to '%s'."), todo_file, todo_backup);
>
> if (launch_sequence_editor(todo_file, &new_todo->buf, NULL))
> return -2;
> @@ -121,10 +125,26 @@ int edit_todo_list(struct repository *r, struct todo_list *todo_list,
> if (initial && new_todo->buf.len == 0)
> return -3;
>
> - /* For the initial edit, the todo list gets parsed in
> - * complete_action(). */
> - if (!initial)
> - return todo_list_parse_insn_buffer(r, new_todo->buf.buf, new_todo);
> + if (todo_list_parse_insn_buffer(r, new_todo->buf.buf, new_todo)) {
> + fprintf(stderr, _(edit_todo_list_advice));
> + return -4;
> + }
> +
> + if (incorrect) {
> + if (todo_list_check_against_backup(r, new_todo)) {
> + write_file(rebase_path_dropped(), "");
> + return -4;
> + }
> +
> + if (incorrect > 0)
> + unlink(rebase_path_dropped());
> + } else if (todo_list_check(todo_list, new_todo)) {
> + write_file(rebase_path_dropped(), "");
We also need to create a backup from todo_list otherwise we'll be using
a stale backup file for the in the clause above when the user edits the
todo list to fix it. This test fails
test_expect_success 'rebase.missingCommitsCheck = error when editing for a second time' '
test_config rebase.missingCommitsCheck error &&
(
set_fake_editor &&
FAKE_LINES="1 break 2 3" git rebase -i A D &&
cp .git/rebase-merge/git-rebase-todo todo &&
test_must_fail env FAKE_LINES=2 git rebase --edit-todo &&
GIT_SEQUENCE_EDITOR="cp todo" git rebase --edit-todo &&
git rebase --continue
)
'
The second edit complains that commit B is missing even though we have
already pick it. This is because we're using a stale backup file.
Sorry to be the bearer of bad tidings
Phillip
> + return -4;
> + } else {
> + todo_list_write_to_file(r, todo_list, todo_backup, shortrevisions, shortonto,
> + -1, flags | TODO_LIST_SHORTEN_IDS | TODO_LIST_APPEND_TODO_HELP);
> + }
>
> return 0;
> }
> @@ -189,11 +209,27 @@ int todo_list_check(struct todo_list *old_todo, struct todo_list *new_todo)
> "the level of warnings.\n"
> "The possible behaviours are: ignore, warn, error.\n\n"));
>
> + fprintf(stderr, _(edit_todo_list_advice));
> +
> leave_check:
> clear_commit_seen(&commit_seen);
> return res;
> }
>
> +int todo_list_check_against_backup(struct repository *r, struct todo_list *todo_list)
> +{
> + struct todo_list backup = TODO_LIST_INIT;
> + int res = 0;
> +
> + if (strbuf_read_file(&backup.buf, rebase_path_todo_backup(), 0) > 0) {
> + todo_list_parse_insn_buffer(r, backup.buf.buf, &backup);
> + res = todo_list_check(&backup, todo_list);
> + }
> +
> + todo_list_release(&backup);
> + return res;
> +}
> +
> int check_todo_list_from_file(struct repository *r)
> {
> struct todo_list old_todo = TODO_LIST_INIT, new_todo = TODO_LIST_INIT;
> @@ -212,10 +248,10 @@ int check_todo_list_from_file(struct repository *r)
> res = todo_list_parse_insn_buffer(r, old_todo.buf.buf, &old_todo);
> if (!res)
> res = todo_list_parse_insn_buffer(r, new_todo.buf.buf, &new_todo);
> - if (!res)
> - res = todo_list_check(&old_todo, &new_todo);
> if (res)
> fprintf(stderr, _(edit_todo_list_advice));
> + if (!res)
> + res = todo_list_check(&old_todo, &new_todo);
> out:
> todo_list_release(&old_todo);
> todo_list_release(&new_todo);
> diff --git a/rebase-interactive.h b/rebase-interactive.h
> index 5f41bf5a28..4af0c1fcc7 100644
> --- a/rebase-interactive.h
> +++ b/rebase-interactive.h
> @@ -11,7 +11,10 @@ void append_todo_help(unsigned keep_empty, int command_count,
> int edit_todo_list(struct repository *r, struct todo_list *todo_list,
> struct todo_list *new_todo, const char *shortrevisions,
> const char *shortonto, unsigned flags);
> +
> int todo_list_check(struct todo_list *old_todo, struct todo_list *new_todo);
> +int todo_list_check_against_backup(struct repository *r,
> + struct todo_list *todo_list);
>
> int check_todo_list_from_file(struct repository *r);
>
> diff --git a/sequencer.c b/sequencer.c
> index 181bb35f5f..2ff18943fb 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -57,6 +57,8 @@ static GIT_PATH_FUNC(rebase_path, "rebase-merge")
> GIT_PATH_FUNC(rebase_path_todo, "rebase-merge/git-rebase-todo")
> GIT_PATH_FUNC(rebase_path_todo_backup, "rebase-merge/git-rebase-todo.backup")
>
> +GIT_PATH_FUNC(rebase_path_dropped, "rebase-merge/dropped")
> +
> /*
> * The rebase command lines that have already been processed. A line
> * is moved here when it is first handled, before any associated user
> @@ -4273,6 +4275,14 @@ int sequencer_continue(struct repository *r, struct replay_opts *opts)
> if (is_rebase_i(opts)) {
> if ((res = read_populate_todo(r, &todo_list, opts)))
> goto release_todo_list;
> +
> + if (file_exists(rebase_path_dropped())) {
> + if ((res = todo_list_check_against_backup(r, &todo_list)))
> + goto release_todo_list;
> +
> + unlink(rebase_path_dropped());
> + }
> +
> if (commit_staged_changes(r, opts, &todo_list))
> return -1;
> } else if (!file_exists(get_todo_path(opts)))
> @@ -4986,12 +4996,6 @@ int todo_list_write_to_file(struct repository *r, struct todo_list *todo_list,
> return res;
> }
>
> -static const char edit_todo_list_advice[] =
> -N_("You can fix this with 'git rebase --edit-todo' "
> -"and then run 'git rebase --continue'.\n"
> -"Or you can abort the rebase with 'git rebase"
> -" --abort'.\n");
> -
> /* skip picking commits whose parents are unchanged */
> static int skip_unnecessary_picks(struct repository *r,
> struct todo_list *todo_list,
> @@ -5089,11 +5093,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
> todo_list_release(&new_todo);
>
> return error(_("nothing to do"));
> - }
> -
> - if (todo_list_parse_insn_buffer(r, new_todo.buf.buf, &new_todo) ||
> - todo_list_check(todo_list, &new_todo)) {
> - fprintf(stderr, _(edit_todo_list_advice));
> + } else if (res == -4) {
> checkout_onto(r, opts, onto_name, &onto->object.oid, orig_head);
> todo_list_release(&new_todo);
>
> diff --git a/sequencer.h b/sequencer.h
> index 75ddc5db3a..00debf5107 100644
> --- a/sequencer.h
> +++ b/sequencer.h
> @@ -11,6 +11,7 @@ const char *git_path_commit_editmsg(void);
> const char *git_path_seq_dir(void);
> const char *rebase_path_todo(void);
> const char *rebase_path_todo_backup(void);
> +const char *rebase_path_dropped(void);
>
> #define APPEND_SIGNOFF_DEDUP (1u << 0)
>
> diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
> index 29a35840ed..f5c3da33bf 100755
> --- a/t/t3404-rebase-interactive.sh
> +++ b/t/t3404-rebase-interactive.sh
> @@ -1343,6 +1343,115 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = error' '
> test B = $(git cat-file commit HEAD^ | sed -ne \$p)
> '
>
> +test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = ignore' '
> + test_config rebase.missingCommitsCheck ignore &&
> + rebase_setup_and_clean missing-commit &&
> + (
> + set_fake_editor &&
> + FAKE_LINES="break 1 2 3 4 5" git rebase -i --root &&
> + FAKE_LINES="1 2 3 4" git rebase --edit-todo &&
> + git rebase --continue 2>actual
> + ) &&
> + test D = $(git cat-file commit HEAD | sed -ne \$p) &&
> + test_i18ngrep \
> + "Successfully rebased and updated refs/heads/missing-commit" \
> + actual
> +'
> +
> +test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = warn' '
> + cat >expect <<-EOF &&
> + error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
> + Warning: some commits may have been dropped accidentally.
> + Dropped commits (newer to older):
> + - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
> + - $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
> + To avoid this message, use "drop" to explicitly remove a commit.
> + EOF
> + head -n4 expect >expect.2 &&
> + tail -n1 expect >>expect.2 &&
> + tail -n4 expect.2 >expect.3 &&
> + test_config rebase.missingCommitsCheck warn &&
> + rebase_setup_and_clean missing-commit &&
> + (
> + set_fake_editor &&
> + test_must_fail env FAKE_LINES="bad 1 2 3 4 5" \
> + git rebase -i --root &&
> + cp .git/rebase-merge/git-rebase-todo.backup orig &&
> + FAKE_LINES="2 3 4" git rebase --edit-todo 2>actual.2 &&
> + head -n6 actual.2 >actual &&
> + test_i18ncmp expect actual &&
> + cp orig .git/rebase-merge/git-rebase-todo &&
> + FAKE_LINES="1 2 3 4" git rebase --edit-todo 2>actual.2 &&
> + head -n4 actual.2 >actual &&
> + test_i18ncmp expect.3 actual &&
> + git rebase --continue 2>actual
> + ) &&
> + test D = $(git cat-file commit HEAD | sed -ne \$p) &&
> + test_i18ngrep \
> + "Successfully rebased and updated refs/heads/missing-commit" \
> + actual
> +'
> +
> +test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = error' '
> + cat >expect <<-EOF &&
> + error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
> + Warning: some commits may have been dropped accidentally.
> + Dropped commits (newer to older):
> + - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
> + - $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
> + To avoid this message, use "drop" to explicitly remove a commit.
> +
> + Use '\''git config rebase.missingCommitsCheck'\'' to change the level of warnings.
> + The possible behaviours are: ignore, warn, error.
> +
> + You can fix this with '\''git rebase --edit-todo'\'' and then run '\''git rebase --continue'\''.
> + Or you can abort the rebase with '\''git rebase --abort'\''.
> + EOF
> + tail -n11 expect >expect.2 &&
> + head -n3 expect.2 >expect.3 &&
> + tail -n7 expect.2 >>expect.3 &&
> + test_config rebase.missingCommitsCheck error &&
> + rebase_setup_and_clean missing-commit &&
> + (
> + set_fake_editor &&
> + test_must_fail env FAKE_LINES="bad 1 2 3 4 5" \
> + git rebase -i --root &&
> + cp .git/rebase-merge/git-rebase-todo.backup orig &&
> + test_must_fail env FAKE_LINES="2 3 4" \
> + git rebase --edit-todo 2>actual &&
> + test_i18ncmp expect actual &&
> + test_must_fail git rebase --continue 2>actual &&
> + test_i18ncmp expect.2 actual &&
> + test_must_fail git rebase --edit-todo &&
> + cp orig .git/rebase-merge/git-rebase-todo &&
> + test_must_fail env FAKE_LINES="1 2 3 4" \
> + git rebase --edit-todo 2>actual &&
> + test_i18ncmp expect.3 actual &&
> + test_must_fail git rebase --continue 2>actual &&
> + test_i18ncmp expect.3 actual &&
> + cp orig .git/rebase-merge/git-rebase-todo &&
> + FAKE_LINES="1 2 3 4 drop 5" git rebase --edit-todo &&
> + git rebase --continue 2>actual
> + ) &&
> + test D = $(git cat-file commit HEAD | sed -ne \$p) &&
> + test_i18ngrep \
> + "Successfully rebased and updated refs/heads/missing-commit" \
> + actual
> +'
> +
> +test_expect_success 'rebase.missingCommitsCheck = error after resolving conflicts' '
> + test_config rebase.missingCommitsCheck error &&
> + (
> + set_fake_editor &&
> + FAKE_LINES="drop 1 break 2 3 4" git rebase -i A E
> + ) &&
> + git rebase --edit-todo &&
> + test_must_fail git rebase --continue &&
> + echo x >file1 &&
> + git add file1 &&
> + git rebase --continue
> +'
> +
> test_expect_success 'respects rebase.abbreviateCommands with fixup, squash and exec' '
> rebase_setup_and_clean abbrevcmd &&
> test_commit "first" file1.txt "first line" first &&
>
next prev parent reply other threads:[~2020-01-19 16:28 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-17 14:39 [RFC PATCH 0/9] rebase -i: extend rebase.missingCommitsCheck to `--edit-todo' and co Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 1/9] t3404: demonstrate that --edit-todo does not check for dropped commits Alban Gruin
2019-07-18 18:31 ` Junio C Hamano
2019-07-19 18:12 ` Alban Gruin
2019-07-19 19:51 ` Junio C Hamano
2019-07-17 14:39 ` [RFC PATCH 2/9] t3429: demonstrate that rebase exec " Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 3/9] sequencer: update `total_nr' when adding an item to a todo list Alban Gruin
2019-07-18 19:52 ` Junio C Hamano
2019-07-19 18:12 ` Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 4/9] sequencer: update `done_nr' when skipping commands in " Alban Gruin
2019-07-18 19:55 ` Junio C Hamano
2019-07-19 18:13 ` Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 5/9] sequencer: move the code writing total_nr on the disk to a new function Alban Gruin
2019-07-18 20:04 ` Junio C Hamano
2019-07-19 18:14 ` Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 6/9] sequencer: add a parameter to sequencer_continue() to accept a todo list Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 7/9] rebase-interactive: todo_list_check() also uses the done list Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 8/9] rebase-interactive: warn if commit is dropped with --edit-todo Alban Gruin
2019-07-17 14:39 ` [RFC PATCH 9/9] sequencer: have read_populate_todo() check for dropped commits Alban Gruin
2019-07-24 13:29 ` [RFC PATCH 0/9] rebase -i: extend rebase.missingCommitsCheck to `--edit-todo' and co Phillip Wood
2019-07-25 9:01 ` Johannes Schindelin
2019-07-25 20:26 ` Alban Gruin
2019-07-29 9:38 ` Phillip Wood
2019-09-24 20:15 ` Alban Gruin
2019-11-04 9:54 ` [RFC PATCH v2 0/2] rebase -i: extend rebase.missingCommitsCheck to `--edit-todo' Alban Gruin
2019-11-04 9:54 ` [RFC PATCH v2 1/2] t3404: demonstrate that --edit-todo does not check for dropped commits Alban Gruin
2019-11-04 9:54 ` [RFC PATCH v2 2/2] rebase-interactive: warn if commit is dropped with --edit-todo Alban Gruin
2019-11-05 14:20 ` Phillip Wood
2019-12-02 23:47 ` [PATCH v3 0/2] rebase -i: extend rebase.missingCommitsCheck Alban Gruin
2019-12-02 23:47 ` [PATCH v3 1/2] sequencer: move check_todo_list_from_file() to rebase-interactive.c Alban Gruin
2019-12-06 14:38 ` Johannes Schindelin
2019-12-02 23:47 ` [PATCH v3 2/2] rebase-interactive: warn if commit is dropped with `rebase --edit-todo' Alban Gruin
2019-12-04 19:19 ` Junio C Hamano
2019-12-09 16:00 ` Phillip Wood
2020-01-09 21:13 ` Alban Gruin
2020-01-10 17:13 ` Phillip Wood
2020-01-10 21:31 ` Alban Gruin
2020-01-11 14:44 ` Phillip Wood
2019-12-09 16:08 ` Phillip Wood
2019-12-04 21:51 ` [PATCH v3 0/2] rebase -i: extend rebase.missingCommitsCheck Junio C Hamano
2019-12-05 23:15 ` Alban Gruin
2019-12-06 10:41 ` Phillip Wood
2019-12-06 14:30 ` Johannes Schindelin
2020-01-11 17:39 ` [PATCH v4 " Alban Gruin
2020-01-11 17:39 ` [PATCH v4 1/2] sequencer: move check_todo_list_from_file() to rebase-interactive.c Alban Gruin
2020-01-11 17:39 ` [PATCH v4 2/2] rebase-interactive: warn if commit is dropped with `rebase --edit-todo' Alban Gruin
2020-01-19 16:28 ` Phillip Wood [this message]
2020-01-25 15:17 ` Alban Gruin
2020-01-25 17:54 ` [PATCH v5 0/2] rebase -i: extend rebase.missingCommitsCheck Alban Gruin
2020-01-25 17:54 ` [PATCH v5 1/2] sequencer: move check_todo_list_from_file() to rebase-interactive.c Alban Gruin
2020-01-25 17:54 ` [PATCH v5 2/2] rebase-interactive: warn if commit is dropped with `rebase --edit-todo' Alban Gruin
2020-01-26 10:04 ` [PATCH v5 0/2] rebase -i: extend rebase.missingCommitsCheck Johannes Schindelin
2020-01-27 21:39 ` Alban Gruin
2020-01-28 22:46 ` Johannes Schindelin
2020-01-28 21:12 ` [PATCH v6 " Alban Gruin
2020-01-28 21:12 ` [PATCH v6 1/2] sequencer: move check_todo_list_from_file() to rebase-interactive.c Alban Gruin
2020-01-28 21:12 ` [PATCH v6 2/2] rebase-interactive: warn if commit is dropped with `rebase --edit-todo' Alban Gruin
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