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Add setting to disable the git apply step in test patch (#22130)

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For a long time Gitea has tested PR patches using a git apply --check
method, and in fact prior to the introduction of a read-tree assisted
three-way merge in #18004, this was the only way of checking patches.

Since #18004, the git apply --check method has been a fallback method,
only used when the read-tree three-way merge method has detected a
conflict. The read-tree assisted three-way merge method is much faster
and less resource intensive method of detecting conflicts. #18004 kept
the git apply method around because it was thought possible that this
fallback might be able to rectify conflicts that the read-tree three-way
merge detected. I am not certain if this could ever be the case.

Given the uncertainty here and the now relative stability of the
read-tree method - this PR makes using this fallback optional and
disables it by default. The hope is that users will not notice any
significant difference in conflict detection and we will be able to
remove the git apply fallback in future, and/or improve the read-tree
three-way merge method to catch any conflicts that git apply method
might have been able to fix.

An additional benefit is that patch checking should be significantly
less resource intensive and much quicker.

(See
https://github.com/go-gitea/gitea/issues/22083\#issuecomment-1347961737)

Ref #22083

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
This commit is contained in:
zeripath 2022-12-19 11:37:15 +00:00 • committed by GitHub
parent a89b399faa
commit d6b96627c1
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4 changed files with 23 additions and 4 deletions
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2
modules/setting/repository.go
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@ -82,6 +82,7 @@ var (
DefaultMergeMessageOfficialApproversOnly bool
PopulateSquashCommentWithCommitMessages bool
AddCoCommitterTrailers bool
TestConflictingPatchesWithGitApply bool
} `ini:"repository.pull-request"`
// Issue Setting
@ -204,6 +205,7 @@ var (
DefaultMergeMessageOfficialApproversOnly bool
PopulateSquashCommentWithCommitMessages bool
AddCoCommitterTrailers bool
TestConflictingPatchesWithGitApply bool
}{
WorkInProgressPrefixes: []string{"WIP:", "[WIP]"},
// Same as GitHub. See