rebase -i: Abort cleanly if new base cannot be checked out

Untracked content in the working tree may prevent rebase -i from checking out
the new base onto which it wants to replay commits, if the new base commit
includes files at those (now untracked) paths. Currently, rebase -i dies
uncleanly in this situation, updating ORIG_HEAD and leaving a useless
.git/rebase-merge directory, with which the user can do nothing useful except
rebase --abort. Make rebase -i abort the procedure itself instead, as
non-interactive rebase already does, and add a test for this behavior.

Signed-off-by: Ian Ward Comfort <icomfort@stanford.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 436b7f5977c05c347debc12130f822af482c03e3..6b86abc64bfe0034caf23cf9530955128766de32 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -974,8 +974,9 @@ EOF
 
                test -d "$REWRITTEN" || test -n "$NEVER_FF" || skip_unnecessary_picks
 
+               output git checkout $ONTO || die_abort "could not detach HEAD"
                git update-ref ORIG_HEAD $HEAD
-               output git checkout $ONTO && do_rest
+               do_rest
                ;;
        esac
        shift

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index f20ea38411d0ca67709dbde0bfd1108e28c0dd71..8d409156d24a11355c2fa124989527b69a683c53 100755 (executable)
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -146,6 +146,16 @@ test_expect_success 'abort' '
        ! test -d .git/rebase-merge
 '
 
+test_expect_success 'abort with error when new base cannot be checked out' '
+       git rm --cached file1 &&
+       git commit -m "remove file in base" &&
+       test_must_fail git rebase -i master > output 2>&1 &&
+       grep "Untracked working tree file .file1. would be overwritten" \
+               output &&
+       ! test -d .git/rebase-merge &&
+       git reset --hard HEAD^
+'
+
 test_expect_success 'retain authorship' '
        echo A > file7 &&
        git add file7 &&