git log --pretty=format:%s -1 "$1"
}
+# There are a few bugs in the rebase with regards to the subtree strategy, and
+# this test script tries to document them. First, the following commit history
+# is generated (the onelines are shown, time flows from left to right):
+#
+# master1 - master2 - master3
+# \
+# README ---------------------- Add subproject master - master4 - files_subtree/master5
+#
+# Where the merge moves the files master[123].t into the subdirectory
+# files_subtree/ and master4 as well as files_subtree/master5 add files to that
+# directory directly.
+#
+# Then, in subsequent test cases, `git filter-branch` is used to distill just
+# the commits that touch files_subtree/. To give it a final pre-rebase touch,
+# an empty commit is added on top. The pre-rebase commit history looks like
+# this:
+#
+# Add subproject master - master4 - files_subtree/master5 - Empty commit
+#
+# where the root commit adds three files: master1.t, master2.t and master3.t.
+#
+# This commit history is then rebased onto `master3` with the
+# `-Xsubtree=files_subtree` option in three different ways:
+#
+# 1. using `--preserve-merges`
+# 2. using `--preserve-merges` and --keep-empty
+# 3. without specifying a rebase backend
+
test_expect_success 'setup' '
test_commit README &&
- mkdir files &&
- (
- cd files &&
- git init &&
- test_commit master1 &&
- test_commit master2 &&
- test_commit master3
- ) &&
- git fetch files master &&
- git branch files-master FETCH_HEAD &&
- git read-tree --prefix=files_subtree files-master &&
- git checkout -- files_subtree &&
- tree=$(git write-tree) &&
- head=$(git rev-parse HEAD) &&
- rev=$(git rev-parse --verify files-master^0) &&
- commit=$(git commit-tree -p $head -p $rev -m "Add subproject master" $tree) &&
- git update-ref HEAD $commit &&
- (
- cd files_subtree &&
- test_commit master4
- ) &&
- test_commit files_subtree/master5
-'
-# FAILURE: Does not preserve master4.
-test_expect_failure 'Rebase -Xsubtree --preserve-merges --onto commit 4' '
- reset_rebase &&
- git checkout -b rebase-preserve-merges-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
- verbose test "$(commit_message HEAD~)" = "files_subtree/master4"
+ git init files &&
+ test_commit -C files master1 &&
+ test_commit -C files master2 &&
+ test_commit -C files master3 &&
+
+ : perform subtree merge into files_subtree/ &&
+ git fetch files refs/heads/master:refs/heads/files-master &&
+ git merge -s ours --no-commit --allow-unrelated-histories \
+ files-master &&
+ git read-tree --prefix=files_subtree -u files-master &&
+ git commit -m "Add subproject master" &&
+
+ : add two extra commits to rebase &&
+ test_commit -C files_subtree master4 &&
+ test_commit files_subtree/master5 &&
+
+ git checkout -b to-rebase &&
+ git fast-export --no-data HEAD -- files_subtree/ |
+ sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" |
+ git fast-import --force --quiet &&
+ git reset --hard &&
+ git commit -m "Empty commit" --allow-empty
'
-# FAILURE: Does not preserve master5.
-test_expect_failure 'Rebase -Xsubtree --preserve-merges --onto commit 5' '
+# FAILURE: Does not preserve master4.
+test_expect_failure REBASE_P 'Rebase -Xsubtree --preserve-merges --onto commit' '
reset_rebase &&
- git checkout -b rebase-preserve-merges-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
+ git checkout -b rebase-preserve-merges to-rebase &&
git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
+ verbose test "$(commit_message HEAD~)" = "master4" &&
verbose test "$(commit_message HEAD)" = "files_subtree/master5"
'
# FAILURE: Does not preserve master4.
-test_expect_failure 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 4' '
- reset_rebase &&
- git checkout -b rebase-keep-empty-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
- verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
-'
-
-# FAILURE: Does not preserve master5.
-test_expect_failure 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 5' '
- reset_rebase &&
- git checkout -b rebase-keep-empty-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
- verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
-'
-
-# FAILURE: Does not preserve Empty.
-test_expect_failure 'Rebase -Xsubtree --keep-empty --preserve-merges --onto empty commit' '
+test_expect_failure REBASE_P 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit' '
reset_rebase &&
- git checkout -b rebase-keep-empty-empty master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
+ git checkout -b rebase-keep-empty to-rebase &&
git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
+ verbose test "$(commit_message HEAD~2)" = "master4" &&
+ verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
verbose test "$(commit_message HEAD)" = "Empty commit"
'
-# FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto commit 4' '
+test_expect_success 'Rebase -Xsubtree --keep-empty --onto commit' '
reset_rebase &&
- git checkout -b rebase-onto-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --onto files-master master &&
- verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
+ git checkout -b rebase-onto to-rebase &&
+ test_must_fail git rebase -Xsubtree=files_subtree --keep-empty --onto files-master master &&
+ : first pick results in no changes &&
+ git rebase --continue &&
+ verbose test "$(commit_message HEAD~2)" = "master4" &&
+ verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
+ verbose test "$(commit_message HEAD)" = "Empty commit"
'
-# FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto commit 5' '
- reset_rebase &&
- git checkout -b rebase-onto-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --onto files-master master &&
- verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
-'
-# FAILURE: fatal: Could not parse object
-test_expect_failure 'Rebase -Xsubtree --onto empty commit' '
+test_expect_success 'Rebase -Xsubtree --keep-empty --rebase-merges --onto commit' '
reset_rebase &&
- git checkout -b rebase-onto-empty master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
- git commit -m "Empty commit" --allow-empty &&
- git rebase -Xsubtree=files_subtree --onto files-master master &&
+ git checkout -b rebase-merges-onto to-rebase &&
+ test_must_fail git rebase -Xsubtree=files_subtree --keep-empty --rebase-merges --onto files-master --root &&
+ : first pick results in no changes &&
+ git rebase --continue &&
+ verbose test "$(commit_message HEAD~2)" = "master4" &&
+ verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
verbose test "$(commit_message HEAD)" = "Empty commit"
'