git-p4: support explicit sync of arbitrary existing git-p4 refs

With the --branch argument of the "sync" subcommand, git-p4 enables
you to import a perforce branch/path to an arbitrary git ref, using
a full ref path, or to refs/remotes/p4/* or refs/heads/p4/*,
depending on --import-local, using a short ref name.

However, when you later want to explicitly sync such a given ref to
pick up subsequent p4 changes, it only works if the ref was placed
in the p4 path *and* has only one path component (no "/").

This limitation results from a bad assumption in the
existing-branch sync logic, and also means you cannot individually
sync branches detected by --detect-branches, as these also get a
"/" in their names.

Fix "git p4 sync --branch", when called with an existing ref, so
that it works correctly regardless of whether the ref is in the p4
path or not, and (in the case of refs in the p4 path) regardless of
whether it has a "/" in its short name or not.

Also add tests to validate that these branch-specific syncs work
as expected.

Signed-off-by: Tao Klerks <tao@klerks.biz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/t/t9800-git-p4-basic.sh b/t/t9800-git-p4-basic.sh
index 8b30062c0c..dc88d0e064 100755
--- a/t/t9800-git-p4-basic.sh
+++ b/t/t9800-git-p4-basic.sh
@@ -74,6 +74,91 @@ test_expect_success 'git p4 sync new branch' '
 	)
 '
 
+#
+# Setup as before, and then explicitly sync imported branch, using a
+# different ref format.
+#
+test_expect_success 'git p4 sync existing branch without changes' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		git p4 sync --branch=refs/remotes/p4/depot >out &&
+		test_i18ngrep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, relative branch name.
+#
+test_expect_success 'git p4 sync existing branch with relative name' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=branch1 //depot@all &&
+		git p4 sync --branch=p4/branch1 >out &&
+		test_i18ngrep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, with a nested branch path, referenced different ways.
+#
+test_expect_success 'git p4 sync existing branch with nested path' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=p4/some/path //depot@all &&
+		git p4 sync --branch=some/path >out &&
+		test_i18ngrep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, with a full ref path outside the p4/* namespace.
+#
+test_expect_success 'git p4 sync branch explicit ref without p4 in path' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=refs/remotes/someremote/depot //depot@all &&
+		git p4 sync --branch=refs/remotes/someremote/depot >out &&
+		test_i18ngrep "No changes to import!" out
+	)
+'
+
+test_expect_success 'git p4 sync nonexistent ref' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		test_must_fail git p4 sync --branch=depot2 2>errs &&
+		test_i18ngrep "Perhaps you never did" errs
+	)
+'
+
+test_expect_success 'git p4 sync existing non-p4-imported ref' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		test_must_fail git p4 sync --branch=refs/heads/master 2>errs &&
+		test_i18ngrep "Perhaps you never did" errs
+	)
+'
+
 test_expect_success 'clone two dirs' '
 	(
 		cd "$cli" &&