push tests: add more testing for forced tag pushing

Improve the tests added in dbfeddb ("push: require force for refs
under refs/tags/", 2012-11-29) to assert that the same behavior
applies various other combinations of command-line option and
refspecs.

Supplying either "+" in refspec or "--force" is sufficient to clobber
the reference. With --no-force we still pay attention to "+" in the
refspec, and vice-versa with clobbering kicking in if there's no "+"
in the refspec but "+" is given.

This is consistent with how refspecs work for branches, where either
"+" or "--force" will enable clobbering, with neither taking priority
over the other.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

t/t5516-fetch-push.sh

@@ -965,7 +965,7 @@ test_expect_success 'push into aliased refs (inconsistent)' '
 	)
 '
 
-test_expect_success 'push requires --force to update lightweight tag' '
+test_expect_success 'force pushing required to update lightweight tag' '
 	mk_test testrepo heads/master &&
 	mk_child testrepo child1 &&
 	mk_child testrepo child2 &&
@@ -981,7 +981,25 @@ test_expect_success 'push requires --force to update lightweight tag' '
 		git push --force ../child2 testTag &&
 		git tag -f testTag HEAD~ &&
 		test_must_fail git push ../child2 testTag &&
-		git push --force ../child2 testTag
+		git push --force ../child2 testTag &&
+
+		# Clobbering without + in refspec needs --force
+		git tag -f testTag &&
+		test_must_fail git push ../child2 "refs/tags/*:refs/tags/*" &&
+		git push --force ../child2 "refs/tags/*:refs/tags/*" &&
+
+		# Clobbering with + in refspec does not need --force
+		git tag -f testTag HEAD~ &&
+		git push ../child2 "+refs/tags/*:refs/tags/*" &&
+
+		# Clobbering with --no-force still obeys + in refspec
+		git tag -f testTag &&
+		git push --no-force ../child2 "+refs/tags/*:refs/tags/*" &&
+
+		# Clobbering with/without --force and "tag <name>" format
+		git tag -f testTag HEAD~ &&
+		test_must_fail git push ../child2 tag testTag &&
+		git push --force ../child2 tag testTag
 	)
 '