t/t3427-rebase-subtree.sh

   1 #!/bin/sh
   2
   3 test_description='git rebase tests for -Xsubtree
   4
   5 This test runs git rebase and tests the subtree strategy.
   6 '
   7 . ./test-lib.sh
   8 . "$TEST_DIRECTORY"/lib-rebase.sh
   9
  10 commit_message() {
  11         git log --pretty=format:%s -1 "$1"
  12 }
  13
  14 # There are a few bugs in the rebase with regards to the subtree strategy, and
  15 # this test script tries to document them.  First, the following commit history
  16 # is generated (the onelines are shown, time flows from left to right):
  17 #
  18 # master1 - master2 - master3
  19 #                             \
  20 # README ---------------------- Add subproject master - master4 - files_subtree/master5
  21 #
  22 # Where the merge moves the files master[123].t into the subdirectory
  23 # files_subtree/ and master4 as well as files_subtree/master5 add files to that
  24 # directory directly.
  25 #
  26 # Then, in subsequent test cases, `git filter-branch` is used to distill just
  27 # the commits that touch files_subtree/. To give it a final pre-rebase touch,
  28 # an empty commit is added on top. The pre-rebase commit history looks like
  29 # this:
  30 #
  31 # Add subproject master - master4 - files_subtree/master5 - Empty commit
  32 #
  33 # where the root commit adds three files: master1.t, master2.t and master3.t.
  34 #
  35 # This commit history is then rebased onto `master3` with the
  36 # `-Xsubtree=files_subtree` option in three different ways:
  37 #
  38 # 1. using `--preserve-merges`
  39 # 2. using `--preserve-merges` and --keep-empty
  40 # 3. without specifying a rebase backend
  41
  42 test_expect_success 'setup' '
  43         test_commit README &&
  44
  45         git init files &&
  46         test_commit -C files master1 &&
  47         test_commit -C files master2 &&
  48         test_commit -C files master3 &&
  49
  50         : perform subtree merge into files_subtree/ &&
  51         git fetch files refs/heads/master:refs/heads/files-master &&
  52         git merge -s ours --no-commit --allow-unrelated-histories \
  53                 files-master &&
  54         git read-tree --prefix=files_subtree -u files-master &&
  55         git commit -m "Add subproject master" &&
  56
  57         : add two extra commits to rebase &&
  58         test_commit -C files_subtree master4 &&
  59         test_commit files_subtree/master5 &&
  60
  61         git checkout -b to-rebase &&
  62         git fast-export --no-data HEAD -- files_subtree/ |
  63                 sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" |
  64                 git fast-import --force --quiet &&
  65         git reset --hard &&
  66         git commit -m "Empty commit" --allow-empty
  67 '
  68
  69 # FAILURE: Does not preserve master4.
  70 test_expect_failure REBASE_P 'Rebase -Xsubtree --preserve-merges --onto commit' '
  71         reset_rebase &&
  72         git checkout -b rebase-preserve-merges to-rebase &&
  73         git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
  74         verbose test "$(commit_message HEAD~)" = "master4" &&
  75         verbose test "$(commit_message HEAD)" = "files_subtree/master5"
  76 '
  77
  78 # FAILURE: Does not preserve master4.
  79 test_expect_failure REBASE_P 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit' '
  80         reset_rebase &&
  81         git checkout -b rebase-keep-empty to-rebase &&
  82         git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
  83         verbose test "$(commit_message HEAD~2)" = "master4" &&
  84         verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
  85         verbose test "$(commit_message HEAD)" = "Empty commit"
  86 '
  87
  88 test_expect_success 'Rebase -Xsubtree --keep-empty --onto commit' '
  89         reset_rebase &&
  90         git checkout -b rebase-onto to-rebase &&
  91         test_must_fail git rebase -Xsubtree=files_subtree --keep-empty --onto files-master master &&
  92         : first pick results in no changes &&
  93         git rebase --continue &&
  94         verbose test "$(commit_message HEAD~2)" = "master4" &&
  95         verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
  96         verbose test "$(commit_message HEAD)" = "Empty commit"
  97 '
  98
  99 test_expect_success 'Rebase -Xsubtree --keep-empty --rebase-merges --onto commit' '
 100         reset_rebase &&
 101         git checkout -b rebase-merges-onto to-rebase &&
 102         test_must_fail git rebase -Xsubtree=files_subtree --keep-empty --rebase-merges --onto files-master --root &&
 103         : first pick results in no changes &&
 104         git rebase --continue &&
 105         verbose test "$(commit_message HEAD~2)" = "master4" &&
 106         verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
 107         verbose test "$(commit_message HEAD)" = "Empty commit"
 108 '
 109
 110 test_done