git/sequencer.h, branch v2.18.2

Merge branch 'js/sequencer-and-root-commits'

2018-05-30T05:04:04Z

The implementation of "git rebase -i --root" has been updated to use the sequencer machinery more. * js/sequencer-and-root-commits: rebase --rebase-merges: root commits can be cousins, too rebase --rebase-merges: a "merge" into a new root is a fast-forward sequencer: allow introducing new root commits rebase -i --root: let the sequencer handle even the initial part sequencer: learn about the special "fake root commit" handling sequencer: extract helper to update active_cache_tree

Merge branch 'js/rebase-recreate-merge'

2018-05-23T05:38:20Z

"git rebase" learned "--rebase-merges" to transplant the whole topology of commit graph elsewhere. * js/rebase-recreate-merge: rebase -i --rebase-merges: add a section to the man page rebase -i: introduce --rebase-merges=[no-]rebase-cousins pull: accept --rebase=merges to recreate the branch topology rebase --rebase-merges: avoid "empty merges" sequencer: handle post-rewrite for merge commands sequencer: make refs generated by the `label` command worktree-local rebase --rebase-merges: add test for --keep-empty rebase: introduce the --rebase-merges option rebase-helper --make-script: introduce a flag to rebase merges sequencer: fast-forward `merge` commands, if possible sequencer: introduce the `merge` command sequencer: introduce new commands to reset the revision git-rebase--interactive: clarify arguments sequencer: offer helpful advice when a command was rescheduled sequencer: refactor how original todo list lines are accessed sequencer: make rearrange_squash() a bit more obvious sequencer: avoid using errno clobbered by rollback_lock_file()

sequencer: learn about the special "fake root commit" handling

2018-05-06T04:21:58Z

When an interactive rebase wants to recreate a root commit, it - first creates a new, empty root commit, - checks it out, - converts the next `pick` command so that it amends the empty root commit Introduce support in the sequencer to handle such an empty root commit, by looking for the file /rebase-merge/squash-onto; if it exists and contains a commit name, the sequencer will compare the HEAD to said root commit, and if identical, a new root commit will be created. While converting scripted code into proper, portable C, we also do away with the old "amend with an empty commit message, then cherry-pick without committing, then amend again" dance and replace it with code that uses the internal API properly to do exactly what we want: create a new root commit. To keep the implementation simple, we always spawn `git commit` to create new root commits. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano

rebase -i: Handle "combination of commits" with GETTEXT_POISON

2018-05-01T22:47:47Z

We previously relied on the localized versions of # This is a combination of commits (which we write into the commit messages during fixup/squash chains) to contain encoded in ASCII. This is not true in general, and certainly not true when compiled with GETTEXT_POISON=TryToKillMe, as demonstrated by the regression test we just introduced in t3418. So let's decouple keeping track of the count from the (localized) commit messages by introducing a new file called 'current-fixups' that keeps track of the current fixup/squash chain. This file contains a bit more than just the count (it contains a list of "fixup "/"squash " lines). This is done on purpose, as it will come in handy for a fix for the bug where `git rebase --skip` on a final fixup/squash will leave the commit message in limbo. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano

rebase -i: introduce --rebase-merges=[no-]rebase-cousins

2018-04-26T03:28:43Z

When running `git rebase --rebase-merges` non-interactively with an ancestor of HEAD as (or leaving the todo list unmodified), we would ideally recreate the exact same commits as before the rebase. However, if there are commits in the commit range .. that do not have as direct ancestor (i.e. if `git log ..` would show commits that are omitted by `git log --ancestry-path ..`), this is currently not the case: we would turn them into commits that have as direct ancestor. Let's illustrate that with a diagram: C / \ A - B - E - F \ / D Currently, after running `git rebase -i --rebase-merges B`, the new branch structure would be (pay particular attention to the commit `D`): --- C' -- / \ A - B ------ E' - F' \ / D' This is not really preserving the branch topology from before! The reason is that the commit `D` does not have `B` as ancestor, and therefore it gets rebased onto `B`. This is unintuitive behavior. Even worse, when recreating branch structure, most use cases would appear to want cousins *not* to be rebased onto the new base commit. For example, Git for Windows (the heaviest user of the Git garden shears, which served as the blueprint for --rebase-merges) frequently merges branches from `next` early, and these branches certainly do *not* want to be rebased. In the example above, the desired outcome would look like this: --- C' -- / \ A - B ------ E' - F' \ / -- D' -- Let's introduce the term "cousins" for such commits ("D" in the example), and let's not rebase them by default. For hypothetical use cases where cousins *do* need to be rebased, `git rebase --rebase=merges=rebase-cousins` needs to be used. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano

rebase-helper --make-script: introduce a flag to rebase merges

2018-04-26T03:28:42Z

The sequencer just learned new commands intended to recreate branch structure (similar in spirit to --preserve-merges, but with a substantially less-broken design). Let's allow the rebase--helper to generate todo lists making use of these commands, triggered by the new --rebase-merges option. For a commit topology like this (where the HEAD points to C): - A - B - C \ / D the generated todo list would look like this: # branch D pick 0123 A label branch-point pick 1234 D label D reset branch-point pick 2345 B merge -C 3456 D # C To keep things simple, we first only implement support for merge commits with exactly two parents, leaving support for octopus merges to a later patch series. All merge-rebasing todo lists start with a hard-coded `label onto` line. This makes it convenient to refer later on to the revision onto which everything is rebased, e.g. as starting point for branches other than the very first one. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano

Merge branch 'pw/sequencer-in-process-commit'

2018-02-13T21:39:15Z

The sequencer infrastructure is shared across "git cherry-pick", "git rebase -i", etc., and has always spawned "git commit" when it needs to create a commit. It has been taught to do so internally, when able, by reusing the codepath "git commit" itself uses, which gives performance boost for a few tens of percents in some sample scenarios. * pw/sequencer-in-process-commit: sequencer: run 'prepare-commit-msg' hook t7505: add tests for cherry-pick and rebase -i/-p t7505: style fixes sequencer: assign only free()able strings to gpg_sign sequencer: improve config handling t3512/t3513: remove KNOWN_FAILURE_CHERRY_PICK_SEES_EMPTY_COMMIT=1 sequencer: try to commit without forking 'git commit' sequencer: load commit related config sequencer: simplify adding Signed-off-by: trailer commit: move print_commit_summary() to libgit commit: move post-rewrite code to libgit Add a function to update HEAD after creating a commit commit: move empty message checks to libgit t3404: check intermediate squash messages

sequencer: run 'prepare-commit-msg' hook

2018-01-24T19:01:31Z

Commit 356ee4659b ("sequencer: try to commit without forking 'git commit'", 2017-11-24) forgot to run the 'prepare-commit-msg' hook when creating the commit. Fix this by writing the commit message to a different file and running the hook. Using a different file means that if the commit is cancelled the original message file is unchanged. Also move the checks for an empty commit so the order matches 'git commit'. Reported-by: Dmitry Torokhov Helped-by: Ramsay Jones Signed-off-by: Phillip Wood Signed-off-by: Junio C Hamano

sequencer: improve config handling

2017-12-13T19:15:14Z

The previous config handling relied on global variables, called git_default_config() even when the key had already been handled by git_sequencer_config() and did not initialize the diff configuration variables. Improve this by: i) loading the default values for message cleanup and gpg signing of commits into struct replay_opts; ii) restructuring the code to return immediately once a key is handled; and iii) calling git_diff_basic_config(). Note that unfortunately it is not possible to return early if the key is handled by git_gpg_config() as it does not indicate to the caller if the key has been handled or not. The sequencer should probably have been calling git_diff_basic_config() before as it creates a patch when there are conflicts. The shell version uses 'diff-tree' to create the patch so calling git_diff_basic_config() should match that. Although 'git commit' calls git_diff_ui_config() I don't think the output of print_commit_summary() is affected by anything that is loaded by that as print_commit_summary() always turns on rename detection so would ignore the value in the user's configuration anyway. The other values loaded by git_diff_ui_config() are about the formatting of patches so are not relevant to print_commit_summary(). Signed-off-by: Phillip Wood Signed-off-by: Junio C Hamano

rebase -i: learn to abbreviate command names

2017-12-05T18:20:51Z

`git rebase -i` already know how to interpret single-letter command names. Teach it to generate the todo list with these same abbreviated names. Based-on-patch-by: Johannes Schindelin Signed-off-by: Liam Beguin Signed-off-by: Junio C Hamano