[PATCH v5 0/4] pre-merge-commit hook

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This series adds a new pre-merge-commit hook, similar in usage to
pre-commit. It also improves hook testing in t7503, by verifying that
the correct hooks are run or bypassed as expected.

The original series was done by Michael J Gruber <git@xxxxxxxxx>. I have
addressed the outstanding review comments, and noted my changes in the
commit messages in "[js: ...]" blocks.

Changes since V4:
* Used "cp" instead of "ln -s" in test hook setup to make tests more
  portable.

Changes since V3:
* Applied several test style fixes suggested by Martin (thanks!).
* Clarified the documentation for pre-merge-commit hook.
* Fixed a few cases where testing that the merge hook did not run might
  erroneously succeed if we don't have any merge to actually perform.
* Simplified test cleanup by adding a new non-executable sample hook
  script.
* Added test cases for non-executable pre-merge-commit hooks.

Changes since V2:
* Renamed the hook from "pre-merge" to "pre-merge-commit".
* Added a new patch (1/4) to improve t7503 by verifying that the
  expected hooks are (or are not) run.
* Squashed test changes (from V2's patch 4/4) into patch 3/4.
  Modified the tests to follow the example set in patch 1/4.
* Reworded commit messages to match with the current state of certain
  flags, which changed in between V1 and V2 of this series.

Josh Steadmon (1):
  t7503: verify proper hook execution

Michael J Gruber (3):
  merge: do no-verify like commit
  git-merge: honor pre-merge-commit hook
  merge: --no-verify to bypass pre-merge-commit hook

 Documentation/git-merge.txt                   |   2 +-
 Documentation/githooks.txt                    |  22 ++
 Documentation/merge-options.txt               |   4 +
 builtin/merge.c                               |  18 +-
 ...3-pre-commit-and-pre-merge-commit-hooks.sh | 281 ++++++++++++++++++
 t/t7503-pre-commit-hook.sh                    | 139 ---------
 templates/hooks--pre-merge-commit.sample      |  13 +
 7 files changed, 336 insertions(+), 143 deletions(-)
 create mode 100755 t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
 delete mode 100755 t/t7503-pre-commit-hook.sh
 create mode 100755 templates/hooks--pre-merge-commit.sample

Range-diff against v4:
1:  5085729095 ! 1:  60bbbbf9e0 t7503: verify proper hook execution
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "more" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
    -+	ln -s "success.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
     +	echo "$PRECOMMIT" >expected_hooks &&
     +	echo "more" >>file &&
      	git add file &&
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "even more" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    -+	ln -s "success.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
     +	echo "even more" >>file &&
      	git add file &&
     -	git commit --no-verify -m "even more"
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "another" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
    -+	ln -s "fail.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
     +	echo "$PRECOMMIT" >expected_hooks &&
     +	echo "another" >>file &&
      	git add file &&
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "stuff" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    -+	ln -s "fail.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
     +	echo "stuff" >>file &&
      	git add file &&
     -	git commit --no-verify -m "stuff"
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "content" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    -+	ln -s "non-exec.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
     +	echo "content" >>file &&
      	git add file &&
     -	git commit -m "content"
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "more content" >> file &&
     +	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    -+	ln -s "non-exec.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
     +	echo "more content" >>file &&
      	git add file &&
     -	git commit --no-verify -m "more content"
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "more content" >> file &&
     +	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks success" &&
    -+	ln -s "require-prefix.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
     +	echo "$PRECOMMIT" >expected_hooks &&
     +	echo "more content" >>file &&
      	git add file &&
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -
     -	echo "more content" >> file &&
     +	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks fail" &&
    -+	ln -s "require-prefix.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
     +	echo "$PRECOMMIT" >expected_hooks &&
     +	echo "more content" >>file &&
      	git add file &&
    @@ t/t7503-pre-commit-hook.sh: test_description='pre-commit hook'
     -	test "$GIT_AUTHOR_NAME" = "New Author" &&
     -	test "$GIT_AUTHOR_EMAIL" = "newauthor@xxxxxxxxxxx"
     +	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
    -+	ln -s "check-author.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/check-author.sample" "$PRECOMMIT" &&
     +	cat >expected_hooks <<-EOF &&
     +	$PRECOMMIT
     +	$PRECOMMIT
2:  3b701a5c41 = 2:  02a97eb369 merge: do no-verify like commit
3:  9210421fbb ! 3:  2d41e0ff79 git-merge: honor pre-merge-commit hook
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success 'with succ
      
     +test_expect_success 'with succeeding hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
    -+	ln -s "success.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
     +	echo "$PREMERGE" >expected_hooks &&
     +	git checkout side &&
     +	git merge -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success 'with succ
     +	test_when_finished "rm -f \"$PREMERGE\" \"$PRECOMMIT\"" &&
     +	test_when_finished "rm -f expected_hooks actual_hooks" &&
     +	test_when_finished "git checkout master" &&
    -+	ln -s "success.sample" "$PREMERGE" &&
    -+	ln -s "success.sample" "$PRECOMMIT" &&
    ++	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
     +
     +	git checkout conflicting-a &&
     +	test_must_fail git merge -m "merge conflicting-b" conflicting-b &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success 'with succ
     +
      test_expect_success '--no-verify with succeeding hook' '
      	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    - 	ln -s "success.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
     @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success '--no-verify with failing hook' '
      	test_path_is_missing actual_hooks
      '
      
     +test_expect_success 'with failing hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
    -+	ln -s "fail.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/fail.sample" "$PREMERGE" &&
     +	echo "$PREMERGE" >expected_hooks &&
     +	git checkout side &&
     +	test_must_fail git merge -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success '--no-veri
     +
      test_expect_success POSIXPERM 'with non-executable hook' '
      	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    - 	ln -s "non-exec.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
     @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success POSIXPERM '--no-verify with non-executable hook' '
      	test_path_is_missing actual_hooks
      '
      
     +test_expect_success POSIXPERM 'with non-executable hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
    -+	ln -s "non-exec.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/non-exec.sample" "$PREMERGE" &&
     +	git branch -f side side-orig &&
     +	git checkout side &&
     +	git merge -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success POSIXPERM
     +
      test_expect_success 'with hook requiring GIT_PREFIX' '
      	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks success" &&
    - 	ln -s "require-prefix.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
     
      ## templates/hooks--pre-merge-commit.sample (new) ##
     @@
4:  96c54883d3 ! 4:  7b81e2717f merge: --no-verify to bypass pre-merge-commit hook
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success '--no-veri
     +
      test_expect_success 'with succeeding hook' '
      	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
    - 	ln -s "success.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
     @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success '--no-verify with succeeding hook' '
      	test_path_is_missing actual_hooks
      '
      
     +test_expect_success '--no-verify with succeeding hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
    -+	ln -s "success.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
     +	git branch -f side side-orig &&
     +	git checkout side &&
     +	git merge --no-verify -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success '--no-veri
     +
      test_expect_success 'with failing hook' '
      	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
    - 	ln -s "fail.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
     @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success 'with failing hook (merge)' '
      	test_cmp expected_hooks actual_hooks
      '
      
     +test_expect_success '--no-verify with failing hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
    -+	ln -s "fail.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/fail.sample" "$PREMERGE" &&
     +	git branch -f side side-orig &&
     +	git checkout side &&
     +	git merge --no-verify -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success 'with fail
     +
      test_expect_success POSIXPERM 'with non-executable hook' '
      	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
    - 	ln -s "non-exec.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
     @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success POSIXPERM 'with non-executable hook (merge)' '
      	test_path_is_missing actual_hooks
      '
      
     +test_expect_success POSIXPERM '--no-verify with non-executable hook (merge)' '
     +	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
    -+	ln -s "non-exec.sample" "$PREMERGE" &&
    ++	cp "$HOOKDIR/non-exec.sample" "$PREMERGE" &&
     +	git branch -f side side-orig &&
     +	git checkout side &&
     +	git merge --no-verify -m "merge master" master &&
    @@ t/t7503-pre-commit-and-pre-merge-commit-hooks.sh: test_expect_success POSIXPERM
     +
      test_expect_success 'with hook requiring GIT_PREFIX' '
      	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks success" &&
    - 	ln -s "require-prefix.sample" "$PRECOMMIT" &&
    + 	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
-- 
2.22.0.770.g0f2c4a37fd-goog




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