Git getter should check for SCP-style URLs and convert properly

If a fully qualified URL like ssh://user@host:path is given, then the
detectors don't run (since the URL is valid). Therefore we must also
correct this directly in the getter.

get_git.go

@@ -78,6 +78,26 @@ func (g *GitGetter) Get(dst string, u *url.URL) error {
 		}
 	}
 
+	// For SSH-style URLs, if they use the SCP syntax of host:path, then
+	// the URL will be mangled. We detect that here and correct the path.
+	// Example: host:path/bar will turn into host/path/bar
+	if u.Scheme == "ssh" {
+		if idx := strings.Index(u.Host, ":"); idx > -1 {
+			// Copy the URL so we don't modify the input
+			var newU url.URL = *u
+			u = &newU
+
+			// Path includes the part after the ':'.
+			u.Path = u.Host[idx+1:] + u.Path
+			if u.Path[0] != '/' {
+				u.Path = "/" + u.Path
+			}
+
+			// Host trims up to the :
+			u.Host = u.Host[:idx]
+		}
+	}
+
 	// Clone or update the repository
 	_, err := os.Stat(dst)
 	if err != nil && !os.IsNotExist(err) {