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authorLibravatar John Keeping <john@keeping.me.uk>2014-07-16 20:23:49 +0100
committerLibravatar Junio C Hamano <gitster@pobox.com>2014-07-16 13:07:40 -0700
commit1e0dacdbdb751caa5936b6d1510f5e8db4d1ed5f (patch)
treeaaceab8c326f0e2b418d16a8e8c46230391db013
parentrebase--am: use --cherry-pick instead of --ignore-if-in-upstream (diff)
downloadtgif-1e0dacdbdb751caa5936b6d1510f5e8db4d1ed5f.tar.xz
rebase: omit patch-identical commits with --fork-point
When the `--fork-point` argument was added to `git rebase`, we changed the value of $upstream to be the fork point instead of the point from which we want to rebase. When $orig_head..$upstream is empty this does not change the behaviour, but when there are new changes in the upstream we are no longer checking if any of them are patch-identical with changes in $upstream..$orig_head. Fix this by introducing a new variable to hold the fork point and using this to restrict the range as an extra (negative) revision argument so that the set of desired revisions becomes (in fork-point mode): git rev-list --cherry-pick --right-only \ $upstream...$orig_head ^$fork_point This allows us to correctly handle the scenario where we have the following topology: C --- D --- E <- dev / B <- master@{1} / o --- B' --- C* --- D* <- master where: - B' is a fixed-up version of B that is not patch-identical with B; - C* and D* are patch-identical to C and D respectively and conflict textually if applied in the wrong order; - E depends textually on D. The correct result of `git rebase master dev` is that B is identified as the fork-point of dev and master, so that C, D, E are the commits that need to be replayed onto master; but C and D are patch-identical with C* and D* and so can be dropped, so that the end result is: o --- B' --- C* --- D* --- E <- dev If the fork-point is not identified, then picking B onto a branch containing B' results in a conflict and if the patch-identical commits are not correctly identified then picking C onto a branch containing D (or equivalently D*) results in a conflict. This change allows us to handle both of these cases, where previously we either identified the fork-point (with `--fork-point`) but not the patch-identical commits *or* (with `--no-fork-point`) identified the patch-identical commits but not the fact that master had been rewritten. Reported-by: Ted Felix <ted@tedfelix.com> Signed-off-by: John Keeping <john@keeping.me.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--git-rebase--am.sh6
-rw-r--r--git-rebase--interactive.sh2
-rwxr-xr-xgit-rebase.sh7
-rwxr-xr-xt/t3400-rebase.sh23
4 files changed, 32 insertions, 6 deletions
diff --git a/git-rebase--am.sh b/git-rebase--am.sh
index 902bf2d969..f923732333 100644
--- a/git-rebase--am.sh
+++ b/git-rebase--am.sh
@@ -45,14 +45,16 @@ then
# itself well to recording empty patches. fortunately, cherry-pick
# makes this easy
git cherry-pick ${gpg_sign_opt:+"$gpg_sign_opt"} --allow-empty \
- --right-only "$revisions"
+ --right-only "$revisions" \
+ ${restrict_revision+^$restrict_revision}
ret=$?
else
rm -f "$GIT_DIR/rebased-patches"
git format-patch -k --stdout --full-index --cherry-pick --right-only \
--src-prefix=a/ --dst-prefix=b/ --no-renames --no-cover-letter \
- "$revisions" >"$GIT_DIR/rebased-patches"
+ "$revisions" ${restrict_revision+^$restrict_revision} \
+ >"$GIT_DIR/rebased-patches"
ret=$?
if test 0 != $ret
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 7e1eda0088..b64dd28acf 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -963,7 +963,7 @@ else
fi
git rev-list $merges_option --pretty=oneline --abbrev-commit \
--abbrev=7 --reverse --left-right --topo-order \
- $revisions | \
+ $revisions ${restrict_revision+^$restrict_revision} | \
sed -n "s/^>//p" |
while read -r shortsha1 rest
do
diff --git a/git-rebase.sh b/git-rebase.sh
index 06c810b64f..55da9db818 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -59,6 +59,7 @@ If you prefer to skip this patch, run "git rebase --skip" instead.
To check out the original branch and stop rebasing, run "git rebase --abort".')
"
unset onto
+unset restrict_revision
cmd=
strategy=
strategy_opts=
@@ -546,7 +547,7 @@ then
"${switch_to:-HEAD}")
if test -n "$new_upstream"
then
- upstream=$new_upstream
+ restrict_revision=$new_upstream
fi
fi
@@ -572,7 +573,7 @@ require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
# and if this is not an interactive rebase.
mb=$(git merge-base "$onto" "$orig_head")
if test "$type" != interactive && test "$upstream" = "$onto" &&
- test "$mb" = "$onto" &&
+ test "$mb" = "$onto" && test -z "$restrict_revision" &&
# linear history?
! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
then
@@ -626,7 +627,7 @@ if test -n "$rebase_root"
then
revisions="$onto..$orig_head"
else
- revisions="$upstream..$orig_head"
+ revisions="${restrict_revision-$upstream}..$orig_head"
fi
run_specific_rebase
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 80e0a951ea..47b5682662 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -169,6 +169,29 @@ test_expect_success 'default to common base in @{upstream}s reflog if no upstrea
test_cmp expect actual
'
+test_expect_success 'cherry-picked commits and fork-point work together' '
+ git checkout default-base &&
+ echo Amended >A &&
+ git commit -a --no-edit --amend &&
+ test_commit B B &&
+ test_commit new_B B "New B" &&
+ test_commit C C &&
+ git checkout default &&
+ git reset --hard default-base@{4} &&
+ test_commit D D &&
+ git cherry-pick -2 default-base^ &&
+ test_commit final_B B "Final B" &&
+ git rebase &&
+ echo Amended >expect &&
+ test_cmp A expect &&
+ echo "Final B" >expect &&
+ test_cmp B expect &&
+ echo C >expect &&
+ test_cmp C expect &&
+ echo D >expect &&
+ test_cmp D expect
+'
+
test_expect_success 'rebase -q is quiet' '
git checkout -b quiet topic &&
git rebase -q master >output.out 2>&1 &&