Merge branch 'jc/maint-am-abort-safely'

* jc/maint-am-abort-safely:
am --abort: keep unrelated commits since the last failure and warn

diff --git a/git-am.sh b/git-am.sh
index df09b42840b7675e135605f9108894ce93e6d477..cf1f64b574b180332105d95295dfa35c8f6e10bb 100755 (executable)
--- a/git-am.sh
+++ b/git-am.sh
@@ -68,9 +68,31 @@ sq () {
 
 stop_here () {
     echo "$1" >"$dotest/next"
+    git rev-parse --verify -q HEAD >"$dotest/abort-safety"
     exit 1
 }
 
+safe_to_abort () {
+       if test -f "$dotest/dirtyindex"
+       then
+               return 1
+       fi
+
+       if ! test -s "$dotest/abort-safety"
+       then
+               return 0
+       fi
+
+       abort_safety=$(cat "$dotest/abort-safety")
+       if test "z$(git rev-parse --verify -q HEAD)" = "z$abort_safety"
+       then
+               return 0
+       fi
+       echo >&2 "You seem to have moved HEAD since the last 'am' failure."
+       echo >&2 "Not rewinding to ORIG_HEAD"
+       return 1
+}
+
 stop_here_user_resolve () {
     if [ -n "$resolvemsg" ]; then
            printf '%s\n' "$resolvemsg"
@@ -419,10 +441,11 @@ then
                        exec git rebase --abort
                fi
                git rerere clear
-               test -f "$dotest/dirtyindex" || {
+               if safe_to_abort
+               then
                        git read-tree --reset -u HEAD ORIG_HEAD
                        git reset ORIG_HEAD
-               }
+               fi
                rm -fr "$dotest"
                exit ;;
        esac

diff --git a/t/t4151-am-abort.sh b/t/t4151-am-abort.sh
index b55c4117884744db8eda17e42fe05e0e65216215..c95c4ccc393d0863ad53b6a2a684893282d7d9e6 100755 (executable)
--- a/t/t4151-am-abort.sh
+++ b/t/t4151-am-abort.sh
@@ -62,4 +62,13 @@ do
 
 done
 
+test_expect_success 'am --abort will keep the local commits intact' '
+       test_must_fail git am 0004-*.patch &&
+       test_commit unrelated &&
+       git rev-parse HEAD >expect &&
+       git am --abort &&
+       git rev-parse HEAD >actual &&
+       test_cmp expect actual
+'
+
 test_done