forgejo/services/repository
Gusted 7c150be23d feat: improved performances when checking for conflicts on pull requests (#7727)
- `testPatch` is a function that is called to test a pull request and determine the state of the pull request. Checking for merge conflicts, check if the diff is empty and if the pull request modifies any protected files.
- The checking for merge conflict and if the diff is empty used git commands that relied on a working tree to correctly functions. Forgejo store repositories in a bare format which do not contain a working tree. This means that a temporary copy was created every time a pull request had to be re-checked and for large repositories involving quite some I/O interaction.
- This patch adjusts those codepaths to instead use newer Git plumbing commands that work without requiring a work tree and can thus be used directly on the bare repository. The merge conflict is now done via [`git-merge-tree(1)`](https://git-scm.com/docs/git-merge-tree/) and checking if the diff is empty is done via [`git-diff-tree(1)`](https://git-scm.com/docs/git-diff-tree).
- If the function is called to test a patch where the head and base repository are not the same, then [Git alternate](https://git-scm.com/docs/gitglossary#Documentation/gitglossary.txt-aiddefalternateobjectdatabaseaalternateobjectdatabase) is used to make the head commit available in the base repository, this done on a per git command basis via the `GIT_ALTERNATE_OBJECT_DIRECTORIES` environment.
- As far as I can understand the documentation and the existing code, there's no edge case that the new code cannot handle. It also results in a cleaner codepath, as the existing code did a lot of checking and merging in a more traditional approach that required a lot of (parsing) code, while the new code offloads this to git and has a trivial parser of the output.
- Resolves forgejo/forgejo#7701
- Added exhaustive integration testing.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7727
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>
2025-05-16 12:40:38 +00:00
..
archiver Update module github.com/golangci/golangci-lint/cmd/golangci-lint to v2 (forgejo) (#7367) 2025-03-28 22:22:21 +00:00
commitstatus chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
files feat: improved performances when checking for conflicts on pull requests (#7727) 2025-05-16 12:40:38 +00:00
gitgraph chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
adopt.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
adopt_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
avatar.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
avatar_test.go Update module github.com/golangci/golangci-lint/cmd/golangci-lint to v2 (forgejo) (#7367) 2025-03-28 22:22:21 +00:00
branch.go feat: move StopTask, CancelPreviousJobs and CleanRepoScheduleTasks to services/actions 2025-04-10 08:38:27 +02:00
cache.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
check.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
collaboration.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
collaboration_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
commit.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
contributors_graph.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
contributors_graph_test.go Update module github.com/golangci/golangci-lint/cmd/golangci-lint to v2 (forgejo) (#7367) 2025-03-28 22:22:21 +00:00
create.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
create_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
delete.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
fork.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
fork_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
generate.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
generate_test.go Move generate from module to service (#29465) 2024-03-06 12:10:44 +08:00
hooks.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
init.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
lfs.go Update module github.com/golangci/golangci-lint/cmd/golangci-lint to v2 (forgejo) (#7367) 2025-03-28 22:22:21 +00:00
lfs_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
main_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
migrate.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
push.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
repository.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
repository_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
review.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
review_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
setting.go feat: move StopTask, CancelPreviousJobs and CleanRepoScheduleTasks to services/actions 2025-04-10 08:38:27 +02:00
star.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
sync_fork.go feat: improved performances when checking for conflicts on pull requests (#7727) 2025-05-16 12:40:38 +00:00
template.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
transfer.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00
transfer_test.go chore: branding import path (#7337) 2025-03-27 19:40:14 +00:00