ssh: 'simple' variant does not support --port

When trying to connect to an ssh:// URL with port explicitly specified
and the ssh command configured with GIT_SSH does not support such a
setting, it is less confusing to error out than to silently suppress
the port setting and continue.

This requires updating the GIT_SSH setting in t5603-clone-dirname.sh.
That test is about the directory name produced when cloning various
URLs.  It uses an ssh wrapper that ignores all its arguments but does
not declare that it supports a port argument; update it to set
GIT_SSH_VARIANT=ssh to do so.  (Real-life ssh wrappers that pass a
port argument to OpenSSH would also support -G and would not require
such an update.)

Reported-by: William Yan <wyan@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

connect.c

diff --git a/connect.c b/connect.c
index c3d1cd3..d603386 100644
--- a/connect.c
+++ b/connect.c
@@ -967,11 +967,20 @@ static void push_ssh_options(struct argv_array *args, struct argv_array *env,
 	if (variant == VARIANT_TORTOISEPLINK)
 		argv_array_push(args, "-batch");
 
-	if (port && variant != VARIANT_SIMPLE) {
-		if (variant == VARIANT_SSH)
+	if (port) {
+		switch (variant) {
+		case VARIANT_AUTO:
+			BUG("VARIANT_AUTO passed to push_ssh_options");
+		case VARIANT_SIMPLE:
+			die("ssh variant 'simple' does not support setting port");
+		case VARIANT_SSH:
 			argv_array_push(args, "-p");
-		else
+			break;
+		case VARIANT_PLINK:
+		case VARIANT_PUTTY:
+		case VARIANT_TORTOISEPLINK:
 			argv_array_push(args, "-P");
+		}
 
 		argv_array_push(args, port);
 	}

t/t5601-clone.sh

diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 9ae1606..66784fc 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -378,12 +378,18 @@
 
 test_expect_success 'simple does not support -4/-6' '
 	copy_ssh_wrapper_as "$TRASH_DIRECTORY/simple" &&
-	test_must_fail git clone -4 "[myhost:123]:src" ssh-bracket-clone-simple
+	test_must_fail git clone -4 "myhost:src" ssh-4-clone-simple
+'
+
+test_expect_success 'simple does not support port' '
+	copy_ssh_wrapper_as "$TRASH_DIRECTORY/simple" &&
+	test_must_fail git clone "[myhost:123]:src" ssh-bracket-clone-simple
 '
 
 test_expect_success 'uplink is treated as simple' '
 	copy_ssh_wrapper_as "$TRASH_DIRECTORY/uplink" &&
-	git clone "[myhost:123]:src" ssh-bracket-clone-uplink &&
+	test_must_fail git clone "[myhost:123]:src" ssh-bracket-clone-uplink &&
+	git clone "myhost:src" ssh-clone-uplink &&
 	expect_ssh myhost src
 '
 

t/t5603-clone-dirname.sh

diff --git a/t/t5603-clone-dirname.sh b/t/t5603-clone-dirname.sh
index d5af758..13b5e5e 100755
--- a/t/t5603-clone-dirname.sh
+++ b/t/t5603-clone-dirname.sh
@@ -11,7 +11,9 @@
 	git upload-pack "$TRASH_DIRECTORY"
 	EOF
 	GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper" &&
+	GIT_SSH_VARIANT=ssh &&
 	export GIT_SSH &&
+	export GIT_SSH_VARIANT &&
 	export TRASH_DIRECTORY
 '