am --abort: support aborting to unborn branch

When git-am is first run on an unborn branch, no ORIG_HEAD is created.
As such, any applied commits will remain even after a git am --abort.

To be consistent with the behavior of git am --abort when it is not run
from an unborn branch, we empty the index, and then destroy the branch
pointed to by HEAD if there is no ORIG_HEAD.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-am.sh b/git-am.sh
index f71d7bb99716a096b8cc95dce8a05a0de1d2d8e7..1e4770ad717098211492a40190dbe5952ad94465 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -514,7 +514,14 @@ then
                        index_tree=$(git write-tree) &&
                        orig_head=$(git rev-parse --verify -q ORIG_HEAD || echo $empty_tree) &&
                        git read-tree -m -u $index_tree $orig_head
-                       git reset ORIG_HEAD
+                       if git rev-parse --verify -q ORIG_HEAD >/dev/null 2>&1
+                       then
+                               git reset ORIG_HEAD
+                       else
+                               git read-tree $empty_tree
+                               curr_branch=$(git symbolic-ref HEAD 2>/dev/null) &&
+                               git update-ref -d $curr_branch
+                       fi
                fi
                rm -fr "$dotest"
                exit ;;

diff --git a/t/t4151-am-abort.sh b/t/t4151-am-abort.sh
index e61be631143ca0039c50e0f2d7656cb17d4a49c9..dc6b3b0c7c417e773b34a10206649ffe589e6a95 100755 (executable)
--- a/t/t4151-am-abort.sh
+++ b/t/t4151-am-abort.sh
@@ -14,6 +14,7 @@ test_expect_success setup '
        git add file-1 file-2 &&
        git commit -m initial &&
        git tag initial &&
+       git format-patch --stdout --root initial >initial.patch &&
        for i in 2 3 4 5 6
        do
                echo $i >>file-1 &&
@@ -125,4 +126,20 @@ test_expect_success 'am -3 --abort removes otherfile-4 on unborn branch' '
        test_path_is_missing otherfile-4
 '
 
+test_expect_success 'am -3 --abort on unborn branch removes applied commits' '
+       git checkout -f --orphan orphan &&
+       git reset &&
+       rm -f otherfile-4 otherfile-2 file-1 file-2 &&
+       test_must_fail git am -3 initial.patch 0003-*.patch &&
+       test 3 -eq $(git ls-files -u | wc -l) &&
+       test 4 = "$(cat otherfile-4)" &&
+       git am --abort &&
+       test -z "$(git ls-files -u)" &&
+       test_path_is_missing otherfile-4 &&
+       test_path_is_missing file-1 &&
+       test_path_is_missing file-2 &&
+       test 0 -eq $(git log --oneline 2>/dev/null | wc -l) &&
+       test refs/heads/orphan = "$(git symbolic-ref HEAD)"
+'
+
 test_done