connect.c: ignore extra colon after hostname

Ignore an extra ':' at the end of the hostname in URL's like
"ssh://example.com:/path/to/repo"

The colon is meant to separate a port number from the hostname.
If the port is empty, the colon should be ignored, see RFC 3986.

It had been working for URLs with ssh:// scheme, but was unintentionally
broken in 86ceb3, "allow ssh://user@[2001:db8::1]/repo.git"

Reported-by: Reid Woodbury Jr. <reidw@rawsound.com>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

connect.c

@@ -311,6 +311,8 @@ static void get_host_and_port(char **host, const char **port)
 		if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
 			*colon = 0;
 			*port = colon + 1;
+		} else if (!colon[1]) {
+			*colon = 0;
 		}
 	}
 }

t/t5500-fetch-pack.sh

@@ -576,13 +576,16 @@ do
 	do
 		for h in host user@host user@[::1] user@::1
 		do
-			test_expect_success "fetch-pack --diag-url $p://$h/$r" '
-				check_prot_host_port_path $p://$h/$r $p "$h" NONE "/$r"
-			'
-			# "/~" -> "~" conversion
-			test_expect_success "fetch-pack --diag-url $p://$h/~$r" '
-				check_prot_host_port_path $p://$h/~$r $p "$h" NONE "~$r"
-			'
+			for c in "" :
+			do
+				test_expect_success "fetch-pack --diag-url $p://$h$c/$r" '
+					check_prot_host_port_path $p://$h/$r $p "$h" NONE "/$r"
+				'
+				# "/~" -> "~" conversion
+				test_expect_success "fetch-pack --diag-url $p://$h$c/~$r" '
+					check_prot_host_port_path $p://$h/~$r $p "$h" NONE "~$r"
+				'
+			done
 		done
 		for h in host User@host User@[::1]
 		do

t/t5601-clone.sh

@@ -387,14 +387,17 @@ do
 done
 
 #with ssh:// scheme
-test_expect_success 'clone ssh://host.xz/home/user/repo' '
-	test_clone_url "ssh://host.xz/home/user/repo" host.xz "/home/user/repo"
-'
-
-# from home directory
-test_expect_success 'clone ssh://host.xz/~repo' '
-	test_clone_url "ssh://host.xz/~repo" host.xz "~repo"
+#ignore trailing colon
+for tcol in "" :
+do
+	test_expect_success "clone ssh://host.xz$tcol/home/user/repo" '
+		test_clone_url "ssh://host.xz$tcol/home/user/repo" host.xz /home/user/repo
+	'
+	# from home directory
+	test_expect_success "clone ssh://host.xz$tcol/~repo" '
+	test_clone_url "ssh://host.xz$tcol/~repo" host.xz "~repo"
 '
+done
 
 # with port number
 test_expect_success 'clone ssh://host.xz:22/home/user/repo' '
@@ -407,9 +410,9 @@ test_expect_success 'clone ssh://host.xz:22/~repo' '
 '
 
 #IPv6
-for tuah in ::1 [::1] user@::1 user@[::1] [user@::1]
+for tuah in ::1 [::1] [::1]: user@::1 user@[::1] user@[::1]: [user@::1] [user@::1]:
 do
-	ehost=$(echo $tuah | tr -d "[]")
+	ehost=$(echo $tuah | sed -e "s/1]:/1]/ "| tr -d "[]")
 	test_expect_success "clone ssh://$tuah/home/user/repo" "
 	  test_clone_url ssh://$tuah/home/user/repo $ehost /home/user/repo
 	"