test $HEAD = $(git rev-parse --verify HEAD))
'
+test_expect_success 'push --atomic also prevents branch creation, reports collateral' '
+ # Setup upstream repo - empty for now
+ d=$HTTPD_DOCUMENT_ROOT_PATH/atomic-branches.git &&
+ git init --bare "$d" &&
+ test_config -C "$d" http.receivepack true &&
+ up="$HTTPD_URL"/smart/atomic-branches.git &&
+
+ # Tell "$up" about two branches for now
+ test_commit atomic1 &&
+ test_commit atomic2 &&
+ git branch collateral &&
+ git push "$up" master collateral &&
+
+ # collateral is a valid push, but should be failed by atomic push
+ git checkout collateral &&
+ test_commit collateral1 &&
+
+ # Make master incompatible with upstream to provoke atomic
+ git checkout master &&
+ git reset --hard HEAD^ &&
+
+ # Add a new branch which should be failed by atomic push. This is a
+ # regression case.
+ git branch atomic &&
+
+ # --atomic should cause entire push to be rejected
+ test_must_fail git push --atomic "$up" master atomic collateral 2>output &&
+
+ # the new branch should not have been created upstream
+ test_must_fail git -C "$d" show-ref --verify refs/heads/atomic &&
+
+ # upstream should still reflect atomic2, the last thing we pushed
+ # successfully
+ git rev-parse atomic2 >expected &&
+ # on master...
+ git -C "$d" rev-parse refs/heads/master >actual &&
+ test_cmp expected actual &&
+ # ...and collateral.
+ git -C "$d" rev-parse refs/heads/collateral >actual &&
+ test_cmp expected actual &&
+
+ # the failed refs should be indicated to the user
+ grep "^ ! .*rejected.* master -> master" output &&
+
+ # the collateral failure refs should be indicated to the user
+ grep "^ ! .*rejected.* atomic -> atomic .*atomic push failed" output &&
+ grep "^ ! .*rejected.* collateral -> collateral .*atomic push failed" output
+'
+
test_expect_success 'push --all can push to empty repo' '
d=$HTTPD_DOCUMENT_ROOT_PATH/empty-all.git &&
git init --bare "$d" &&