From: Ben Woosley <ben.woosley@xxxxxxxxx>
Absent this fix, attempts to rebase an orphan branch with --strategy recursive
will fail with:
$ git rebase ORPHAN_TARGET_BASE -s recursive
First, rewinding head to replay your work on top of it...
fatal: Could not parse object 'ORPHAN_ROOT_SHA^'
Unknown exit code (128) from command: git-merge-recursive ORPHAN_ROOT_SHA^ -- HEAD ORPHAN_ROOT_SHA
To fix, this will only include the rebase root's parent as a base if it exists,
so that in cases of rebasing an orphan branch, it is a simple two-way merge.
Note the default rebase behavior does not fail:
$ git rebase ORPHAN_TARGET_BASE
First, rewinding head to replay your work on top of it...
Applying: ORPHAN_ROOT_COMMIT_MSG
Using index info to reconstruct a base tree...
Signed-off-by: Ben Woosley <ben.woosley@xxxxxxxxx>
---
git-rebase--merge.sh | 4 +++-
t/t3402-rebase-merge.sh | 9 +++++++++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/git-rebase--merge.sh b/git-rebase--merge.sh
index 2cc2a6d..8d43db9 100644
--- a/git-rebase--merge.sh
+++ b/git-rebase--merge.sh
@@ -67,7 +67,9 @@ call_merge () {
GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
fi
test -z "$strategy" && strategy=recursive
- eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
+ # If cmt doesn't have a parent, don't include it as a base
+ base=$(git rev-parse --verify --quiet $cmt^)
+ eval 'git-merge-$strategy' $strategy_opts $base ' -- "$hd" "$cmt"'
rv=$?
case "$rv" in
0)
diff --git a/t/t3402-rebase-merge.sh b/t/t3402-rebase-merge.sh
index 8f64505..488945e 100755
--- a/t/t3402-rebase-merge.sh
+++ b/t/t3402-rebase-merge.sh
@@ -85,6 +85,15 @@ test_expect_success 'rebase -Xtheirs' '
! grep 11 original
'
+test_expect_success 'rebase -Xtheirs from orphan' '
+ git checkout --orphan orphan-conflicting master~2 &&
+ echo "AB $T" >> original &&
+ git commit -morphan-conflicting original &&
+ git rebase -Xtheirs master &&
+ grep AB original &&
+ ! grep 11 original
+'
+
test_expect_success 'merge and rebase should match' '
git diff-tree -r test-rebase test-merge >difference &&
if test -s difference
--
https://github.com/git/git/pull/228
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