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2020-05-14Merge branch 'js/rebase-autosquash-double-fixup-fix'Junio C Hamano
"rebase -i" segfaulted when rearranging a sequence that has a fix-up that applies another fix-up (which may or may not be a fix-up of yet another step). * js/rebase-autosquash-double-fixup-fix: rebase --autosquash: fix a potential segfault
2020-05-09rebase --autosquash: fix a potential segfaultJohannes Schindelin
When rearranging the todo list so that the fixups/squashes are reordered just after the commits they intend to fix up, we use two arrays to maintain that list: `next` and `tail`. The idea is that `next[i]`, if set to a non-negative value, contains the index of the item that should be rearranged just after the `i`th item. To avoid having to walk the entire `next` chain when appending another fixup/squash, we also store the end of the `next` chain in `tail[i]`. The logic we currently use to update these array items is based on the assumption that given a fixup/squash item at index `i`, we just found the index `i2` indicating the first item in that fixup chain. However, as reported by Paul Ganssle, that need not be true: the special form `fixup! <commit-hash>` is allowed to point to _another_ fixup commit in the middle of the fixup chain. Example: * 0192a To fixup * 02f12 fixup! To fixup * 03763 fixup! To fixup * 04ecb fixup! 02f12 Note how the fourth commit targets the second commit, which is already a fixup that targets the first commit. Previously, we would update `next` and `tail` under our assumption that every `fixup!` commit would find the start of the `fixup!`/`squash!` chain. This would lead to a segmentation fault because we would actually end up with a `next[i]` pointing to a `fixup!` but the corresponding `tail[i]` pointing nowhere, which would the lead to a segmentation fault. Let's fix this by _inserting_, rather than _appending_, the item. In other words, if we make a given line successor of another line, we do not simply forget any previously set successor of the latter, but make it a successor of the former. In the above example, at the point when we insert 04ecb just after 02f12, 03763 would already be recorded as a successor of 04ecb, and we now "squeeze in" 04ecb. To complete the idea, we now no longer assume that `next[i]` pointing to a line means that `last[i]` points to a line, too. Instead, we extend the concept of `last` to cover also partial `fixup!`/`squash!` chains, i.e. chains starting in the middle of a larger such chain. In the above example, after processing all lines, `last[0]` (corresponding to 0192a) would point to 03763, which indeed is the end of the overall `fixup!` chain, and `last[1]` (corresponding to 02f12) would point to 04ecb (which is the last `fixup!` targeting 02f12, but it has 03763 as successor, i.e. it is not the end of overall `fixup!` chain). Reported-by: Paul Ganssle <paul@ganssle.io> Helped-by: Jeff King <peff@peff.net> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-01-27t3415: increase granularity of test_auto_{fixup,squash}()Denton Liu
We are using `test_must_fail test_auto_{fixup,squash}` which would ensure that the function failed. However, this is a little ham-fisted as there is no way of ensuring that the expected part of the function actually fails. Increase the granularity by accepting an optional `!` first argument which will check that the rebase does not squash in any commits by ensuring that there are still 4 commits. If `!` is not provided, the old logic is run. This patch may be better reviewed with `--ignore-all-space`. Signed-off-by: Denton Liu <liu.denton@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-01-27t3415: stop losing return codes of git commandsDenton Liu
Fix invocations of git commands so their exit codes are not lost within non-assignment command substitutions. Signed-off-by: Denton Liu <liu.denton@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-02tests (rebase): spell out the `--force-rebase` optionJohannes Schindelin
In quite a few test cases, we were sloppy and used the abbreviation `--force`, but we really should be precise in what we want to test. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-04rebase -i: be careful to wrap up fixup/squash chainsJohannes Schindelin
When an interactive rebase was stopped at the end of a fixup/squash chain, the user might have edited the commit manually before continuing (with either `git rebase --skip` or `git rebase --continue`, it does not really matter which). We need to be very careful to wrap up the fixup/squash chain also in this scenario: otherwise the next fixup/squash chain would try to pick up where the previous one was left. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2018-09-04rebase -i --autosquash: demonstrate a problem skipping the last squashJohannes Schindelin
The `git commit --squash` command can be used not only to amend commit messages and changes, but also to record notes for an upcoming rebase. For example, when the author information of a given commit is incorrect, a user might call `git commit --allow-empty -m "Fix author" --squash <commit>`, to remind them to fix that during the rebase. When the editor would pop up, the user would simply delete the commit message to abort the rebase at this stage, fix the author information, and continue with `git rebase --skip`. (This is a real-world example from the rebase of Git for Windows onto v2.19.0-rc1.) However, there is a bug in `git rebase` that will cause the squash message *not* to be forgotten in this case. It will therefore be reused in the next fixup/squash chain (if any). This patch adds a test case to demonstrate this breakage. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2017-07-27rebase -i: rearrange fixup/squash lines using the rebase--helperJohannes Schindelin
This operation has quadratic complexity, which is especially painful on Windows, where shell scripts are *already* slow (mainly due to the overhead of the POSIX emulation layer). Let's reimplement this with linear complexity (using a hash map to match the commits' subject lines) for the common case; Sadly, the fixup/squash feature's design neglected performance considerations, allowing arbitrary prefixes (read: `fixup! hell` will match the commit subject `hello world`), which means that we are stuck with quadratic performance in the worst case. The reimplemented logic also happens to fix a bug where commented-out lines (representing empty patches) were dropped by the previous code. While at it, clarify how the fixup/squash feature works in `git rebase -i`'s man page. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-07-27t3415: test fixup with wrapped onelineJohannes Schindelin
The `git commit --fixup` command unwraps wrapped onelines when constructing the commit message, without wrapping the result. We need to make sure that `git rebase --autosquash` keeps handling such cases correctly, in particular since we are about to move the autosquash handling into the rebase--helper. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-07-27t3415: verify that an empty instructionFormat is handled as beforeJohannes Schindelin
An upcoming patch will move the todo list generation into the rebase--helper. An early version of that patch regressed on an empty rebase.instructionFormat value (the shell version could not discern between an empty one and a non-existing one, but the C version used the empty one as if that was intended to skip the oneline from the `pick <hash>` lines). Let's verify that this still works as before. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-11tests: fix tests broken under GETTEXT_POISON=YesPleaseÆvar Arnfjörð Bjarmason
The GETTEXT_POISON=YesPlease compile-time testing option added in my bb946bba76 ("i18n: add GETTEXT_POISON to simulate unfriendly translator", 2011-02-22) has been slowly bitrotting as strings have been marked for translation, and new tests have been added without running it. I brought this up on the list ("[BUG] test suite broken with GETTEXT_POISON=YesPlease", [1]) asking whether this mode was useful at all anymore. At least one person occasionally uses it, and Lars Schneider offered to change one of the the Travis builds to run in this mode, so fix up the failing ones. My test setup runs most of the tests, with the notable exception of skipping all the p4 tests, so it's possible that there's still some lurking regressions I haven't fixed. 1. <CACBZZX62+acvi1dpkknadTL827mtCm_QesGSZ=6+UnyeMpg8+Q@mail.gmail.com> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-07-07rebase -i: we allow extra spaces after fixup!/squash!Johannes Schindelin
This new test case ensures that we handle commit messages that start with fixup! or squash! followed by more than one space. While we do not generate such messages when committing with --fixup/--squash, it is perfectly legal for users to hand-craft their own fixup messages, and we heed Postel's law by being lenient. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-07-07rebase -i: demonstrate a bug with --autosquashJohannes Schindelin
When rearranging the edit script, we happily mistake the comment character for a command, and the command for a SHA-1. As a consequence, when we move fixup! and squash! commits, our logic to skip lines with already handled SHA-1s mistakenly skips anything but the first commented-out pick line, too. The upcoming rebase--helper patches will address this bug, therefore we do not need to make the current autosquash code even more complex than it already is, just to fix this bug. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-15git-rebase--interactive.sh: add config option for custom instruction formatMichael Rappazzo
A config option 'rebase.instructionFormat' can override the default 'oneline' format of the rebase instruction list. Since the list is parsed using the left, right or boundary mark plus the sha1, they are prepended to the instruction format. Signed-off-by: Michael Rappazzo <rappazzo@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-27rebase -i: handle fixup! fixup! in --autosquashAndrew Pimlott
In rebase -i --autosquash, ignore all "fixup! " or "squash! " after the first. This supports the case when a git commit --fixup/--squash referred to an earlier fixup/squash instead of the original commit (whether intentionally, as when the user expressly meant to note that the commit fixes an earlier fixup; or inadvertently, as when the user meant to refer to the original commit with :/msg; or out of laziness, as when the user could remember how to refer to the fixup but not the original). In the todo list, the full commit message is preserved, in case it provides useful cues to the user. A test helper set_cat_todo_editor is introduced to check this. Helped-by: Thomas Rast <trast@inf.ethz.ch> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Andrew Pimlott <andrew@pimlott.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-04-11tests: modernise style: more uses of test_line_countStefano Lattarini
Prefer: test_line_count <OP> COUNT FILE over: test $(wc -l <FILE) <OP> COUNT (or similar usages) in several tests. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-12-04Merge branch 'pn/commit-autosquash'Junio C Hamano
* pn/commit-autosquash: add tests of commit --squash commit: --squash option for use with rebase --autosquash add tests of commit --fixup commit: --fixup option for use with rebase --autosquash pretty.c: teach format_commit_message() to reencode the output commit: helper methods to reduce redundant blocks of code Conflicts: Documentation/git-commit.txt t/t3415-rebase-autosquash.sh
2010-11-09rebase: teach --autosquash to match on sha1 in addition to messageKevin Ballard
Support lines of the form "fixup! 7a235b" that specify an exact commit in addition to the normal "squash! Old commit message" form. Signed-off-by: Kevin Ballard <kevin@sb.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-09rebase: better rearranging of fixup!/squash! lines with --autosquashKevin Ballard
The current behvaior of --autosquash can duplicate fixup!/squash! lines if they match multiple commits, and it can also apply them to commits that come after them in the todo list. Even more oddly, a commit that looks like "fixup! fixup!" will match itself and be duplicated in the todo list. Change the todo list rearranging to mark all commits as used as soon as they are emitted, and to avoid emitting a fixup/squash commit if the commit has already been marked as used. Signed-off-by: Kevin Ballard <kevin@sb.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-04add tests of commit --squashPat Notz
t7500: test expected behavior of commit --squash t3415: test interaction of commit --squash with rebase --autosquash t3900: test commit --squash with i18n encodings Signed-off-by: Pat Notz <patnotz@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-04add tests of commit --fixupPat Notz
t7500: test expected behavior of commit --fixup t3415: test interaction of commit --fixup with rebase --autosquash t3900: test commit --fixup with i18n encodings Signed-off-by: Pat Notz <patnotz@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-10-06t/t3415: use && where applicable.Yann Dirson
Signed-off-by: Yann Dirson <ydirson@altern.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-07-14add configuration variable for --autosquash option of interactive rebaseHeiko Voigt
If you use this feature regularly you can now enable it by default. In case the user wants to override this config on the commandline --no-autosquash can be used to force disabling. Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-07rebase -i --autosquash: auto-squash commitsNanako Shiraishi
Teach a new option, --autosquash, to the interactive rebase. When the commit log message begins with "!fixup ...", and there is a commit whose title begins with the same ..., automatically modify the todo list of rebase -i so that the commit marked for squashing come right after the commit to be modified, and change the action of the moved commit from pick to squash. Signed-off-by: Nanako Shiraishi <nanako3@lavabit.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>