rebase -i -p: include non-first-parent commits in todo list

Consider this graph:

        D---E    (topic, HEAD)
       /   /
  A---B---C      (master)
   \
    F            (topic2)

and the following three commands:
  1. git rebase -i -p A
  2. git rebase -i -p --onto F A
  3. git rebase -i -p B

Currently, (1) and (2) will pick B, D, C, and E onto A and F,
respectively.  However, (3) will only pick D and E onto B, but not C,
which is inconsistent with (1) and (2).  As a result, we cannot modify C
during the interactive-rebase.

The current behavior also creates a bug if we do:
  4. git rebase -i -p C

In (4), E is never picked.  And since interactive-rebase resets "HEAD"
to "onto" before picking any commits, D and E are lost after the
interactive-rebase.

This patch fixes the inconsistency and bug by ensuring that all children
of upstream are always picked.  This essentially reverts the commit:
  d80d6bc146232d81f1bb4bc58e5d89263fd228d4

When compiling the todo list, commits reachable from "upstream" should
never be skipped under any conditions.  Otherwise, we lose the ability
to modify them like (3), and create a bug like (4).

Two of the tests contain a scenario like (3).  Since the new behavior
added more commits for picking, these tests need to be updated to
account for the additional pick lines.  A new test has also been added
for (4).

Signed-off-by: Andrew Wong <andrew.kw.w@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 65690af89307abd72749123caddce9e6c4692383..c6ba7c15510935353bd17b2b8d8188fe16052907 100644 (file)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -713,7 +713,6 @@ then
        # parents to rewrite and skipping dropped commits would
        # prematurely end our probe
        merges_option=
-       first_after_upstream="$(git rev-list --reverse --first-parent $upstream..$orig_head | head -n 1)"
 else
        merges_option="--no-merges --cherry-pick"
 fi
@@ -746,7 +745,7 @@ do
                        preserve=t
                        for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
                        do
-                               if test -f "$rewritten"/$p -a \( $p != $onto -o $sha1 = $first_after_upstream \)
+                               if test -f "$rewritten"/$p
                                then
                                        preserve=f
                                fi

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 47c8371c7edfe7945ded380bb6f96a00d26c04eb..8538813d1d0dfa72008da1d711cf2c042796a6ee 100755 (executable)
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -295,7 +295,7 @@ test_expect_success 'preserve merges with -p' '
 '
 
 test_expect_success 'edit ancestor with -p' '
-       FAKE_LINES="1 edit 2 3 4" git rebase -i -p HEAD~3 &&
+       FAKE_LINES="1 2 edit 3 4" git rebase -i -p HEAD~3 &&
        echo 2 > unrelated-file &&
        test_tick &&
        git commit -m L2-modified --amend unrelated-file &&

diff --git a/t/t3409-rebase-preserve-merges.sh b/t/t3409-rebase-preserve-merges.sh
index 08201e2331d36af769d832e3d9551c48331b7033..6de4e2263f9ec65d2de2e28af6a12d5c1065f686 100755 (executable)
--- a/t/t3409-rebase-preserve-merges.sh
+++ b/t/t3409-rebase-preserve-merges.sh
@@ -37,7 +37,15 @@ export GIT_AUTHOR_EMAIL
 #      \
 #       B2     <-- origin/topic
 #
-# In all cases, 'topic' is rebased onto 'origin/topic'.
+# Clone 4 (merge using second parent as base):
+#
+# A1--A2--B3   <-- origin/master
+#  \
+#   B1--A3--M  <-- topic
+#    \     /
+#     \--A4    <-- topic2
+#      \
+#       B2     <-- origin/topic
 
 test_expect_success 'setup for merge-preserving rebase' \
        'echo First > A &&
@@ -57,6 +65,13 @@ test_expect_success 'setup for merge-preserving rebase' \
        git merge origin/master
        ) &&
 
+       git clone ./. clone4 &&
+       (
+               cd clone4 &&
+               git checkout -b topic origin/topic &&
+               git merge origin/master
+       ) &&
+
        echo Fifth > B &&
        git add B &&
        git commit -m "Add different B" &&
@@ -123,4 +138,15 @@ test_expect_success 'rebase -p preserves no-ff merges' '
        )
 '
 
+test_expect_success 'rebase -p works when base inside second parent' '
+       (
+       cd clone4 &&
+       git fetch &&
+       git rebase -p HEAD^2 &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Modify B" | wc -l) &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Merge remote-tracking branch " | wc -l)
+       )
+'
+
 test_done

diff --git a/t/t3411-rebase-preserve-around-merges.sh b/t/t3411-rebase-preserve-around-merges.sh
index 14a23cd8726fbb33df480133ed0466177916b7fb..ace8e54e9b374688751cc470eeb9003ca7f5c48f 100755 (executable)
--- a/t/t3411-rebase-preserve-around-merges.sh
+++ b/t/t3411-rebase-preserve-around-merges.sh
@@ -37,7 +37,7 @@ test_expect_success 'setup' '
 #        -- C1 --
 #
 test_expect_success 'squash F1 into D1' '
-       FAKE_LINES="1 squash 3 2" git rebase -i -p B1 &&
+       FAKE_LINES="1 squash 4 2 3" git rebase -i -p B1 &&
        test "$(git rev-parse HEAD^2)" = "$(git rev-parse C1)" &&
        test "$(git rev-parse HEAD~2)" = "$(git rev-parse B1)" &&
        git tag E2