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Add a `--revert <branch>` mode to git replay that undoes the changes introduced by the specified commits. Like --onto and --advance, --revert is a standalone mode: it takes a branch argument and updates that branch with the newly created revert commits. At GitLab, we need this in Gitaly for reverting commits directly on bare repositories without requiring a working tree checkout. The approach is the same as sequencer.c's do_pick_commit() -- cherry-pick and revert are just the same three-way merge with swapped arguments: - Cherry-pick: merge(ancestor=parent, ours=current, theirs=commit) - Revert: merge(ancestor=commit, ours=current, theirs=parent) We swap the base and pickme trees passed to merge_incore_nonrecursive() to reverse the diff direction. Revert commit messages follow the usual git revert conventions: prefixed with "Revert" (or "Reapply" when reverting a revert), and including "This reverts commit <hash>.". The author is set to the current user rather than preserving the original author, matching git revert behavior. Helped-by: Christian Couder <christian.couder@gmail.com> Helped-by: Patrick Steinhardt <ps@pks.im> Helped-by: Elijah Newren <newren@gmail.com> Helped-by: Phillip Wood <phillip.wood123@gmail.com> Helped-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Siddharth Asthana <siddharthasthana31@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
#ifndef REPLAY_H
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#define REPLAY_H
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#include "hash.h"
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struct repository;
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struct rev_info;
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/*
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* A set of options that can be passed to `replay_revisions()`.
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*/
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struct replay_revisions_options {
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/*
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* Starting point at which to create the new commits; must be a branch
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* name. The branch will be updated to point to the rewritten commits.
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* This option is mutually exclusive with `onto` and `revert`.
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*/
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const char *advance;
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/*
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* Starting point at which to create the new commits; must be a
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* committish. References pointing at decendants of `onto` will be
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* updated to point to the new commits.
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*/
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const char *onto;
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/*
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* Starting point at which to create revert commits; must be a branch
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* name. The branch will be updated to point to the revert commits.
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* This option is mutually exclusive with `onto` and `advance`.
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*/
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const char *revert;
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/*
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* Update branches that point at commits in the given revision range.
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* Requires `onto` to be set.
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*/
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int contained;
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};
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/* This struct is used as an out-parameter by `replay_revisions()`. */
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struct replay_result {
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/*
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* The set of reference updates that are caused by replaying the
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* commits.
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*/
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struct replay_ref_update {
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char *refname;
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struct object_id old_oid;
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struct object_id new_oid;
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} *updates;
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size_t updates_nr, updates_alloc;
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};
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void replay_result_release(struct replay_result *result);
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/*
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* Replay a set of commits onto a new location. Leaves both the working tree,
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* index and references untouched. Reference updates caused by the replay will
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* be recorded in the `updates` out pointer.
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*
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* Returns 0 on success, 1 on conflict and a negative error code otherwise.
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*/
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int replay_revisions(struct rev_info *revs,
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struct replay_revisions_options *opts,
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struct replay_result *out);
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#endif
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