Merge branch 'fc/atmark-in-refspec'

"@" sometimes worked (e.g. "git push origin @:there") as a part of
a refspec element, but "git push origin @" did not work, which has
been corrected.

* fc/atmark-in-refspec:
  refspec: make @ a synonym of HEAD
  tests: push: trivial cleanup
  tests: push: improve cleanup of HEAD tests

refspec.c

@@ -71,6 +71,9 @@ static int parse_refspec(struct refspec_item *item, const char *refspec, int fet
 	}
 
 	item->pattern = is_glob;
+	if (llen == 1 && *lhs == '@')
+		item->src = xstrdup("HEAD");
+	else
 		item->src = xstrndup(lhs, llen);
 	flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 

t/t5511-refspec.sh

@@ -58,6 +58,8 @@ test_refspec fetch 'HEAD~4:refs/remotes/frotz/new'		invalid
 
 test_refspec push 'HEAD'
 test_refspec fetch 'HEAD'
+test_refspec push '@'
+test_refspec fetch '@'
 test_refspec push 'refs/heads/ nitfol'				invalid
 test_refspec fetch 'refs/heads/ nitfol'				invalid
 

t/t5516-fetch-push.sh

@@ -436,70 +436,76 @@ test_expect_success 'push ref expression with non-existent, incomplete dest' '
 
 '
 
-test_expect_success 'push with HEAD' '
+for head in HEAD @
+do
+
+	test_expect_success "push with $head" '
 
 		mk_test testrepo heads/master &&
 		git checkout master &&
-	git push testrepo HEAD &&
+		git push testrepo $head &&
 		check_push_result testrepo $the_commit heads/master
 
-'
+	'
 
-test_expect_success 'push with HEAD nonexisting at remote' '
+	test_expect_success "push with $head nonexisting at remote" '
 
 		mk_test testrepo heads/master &&
 		git checkout -b local master &&
-	git push testrepo HEAD &&
+		test_when_finished "git checkout master; git branch -D local" &&
+		git push testrepo $head &&
 		check_push_result testrepo $the_commit heads/local
-'
+	'
 
-test_expect_success 'push with +HEAD' '
+	test_expect_success "push with +$head" '
 
 		mk_test testrepo heads/master &&
-	git checkout master &&
-	git branch -D local &&
-	git checkout -b local &&
+		git checkout -b local master &&
+		test_when_finished "git checkout master; git branch -D local" &&
 		git push testrepo master local &&
 		check_push_result testrepo $the_commit heads/master &&
 		check_push_result testrepo $the_commit heads/local &&
 
 		# Without force rewinding should fail
-	git reset --hard HEAD^ &&
-	test_must_fail git push testrepo HEAD &&
+		git reset --hard $head^ &&
+		test_must_fail git push testrepo $head &&
 		check_push_result testrepo $the_commit heads/local &&
 
 		# With force rewinding should succeed
-	git push testrepo +HEAD &&
+		git push testrepo +$head &&
 		check_push_result testrepo $the_first_commit heads/local
 
-'
+	'
 
-test_expect_success 'push HEAD with non-existent, incomplete dest' '
+	test_expect_success "push $head with non-existent, incomplete dest" '
 
 		mk_test testrepo &&
 		git checkout master &&
-	git push testrepo HEAD:branch &&
+		git push testrepo $head:branch &&
 		check_push_result testrepo $the_commit heads/branch
 
-'
+	'
 
-test_expect_success 'push with config remote.*.push = HEAD' '
+	test_expect_success "push with config remote.*.push = $head" '
 
 		mk_test testrepo heads/local &&
 		git checkout master &&
 		git branch -f local $the_commit &&
+		test_when_finished "git branch -D local" &&
 		(
 			cd testrepo &&
 			git checkout local &&
 			git reset --hard $the_first_commit
 		) &&
 		test_config remote.there.url testrepo &&
-	test_config remote.there.push HEAD &&
+		test_config remote.there.push $head &&
 		test_config branch.master.remote there &&
 		git push &&
 		check_push_result testrepo $the_commit heads/master &&
 		check_push_result testrepo $the_first_commit heads/local
-'
+	'
+
+done
 
 test_expect_success 'push with remote.pushdefault' '
 	mk_test up_repo heads/master &&