feat: parse unix-socket-path cli argument.

cmd/root.go

@@ -543,13 +543,23 @@ func parseConfig(cmd *Command, conf *proxy.Config, args []string) error {
 			a, aok := q["address"]
 			p, pok := q["port"]
 			u, uok := q["unix-socket"]
+			up, upok := q["unix-socket-path"]
 
 			if aok && uok {
 				return newBadCommandError("cannot specify both address and unix-socket query params")
 			}
 			if pok && uok {
 				return newBadCommandError("cannot specify both port and unix-socket query params")
 			}
+			if aok && upok {
+				return newBadCommandError("cannot specify both address and unix-socket-path query params")
+			}
+			if pok && upok {
+				return newBadCommandError("cannot specify both port and unix-socket-path query params")
+			}
+			if uok && upok {
+				return newBadCommandError("cannot specify both unix-socket-path and unix-socket query params")
+			}
 
 			if aok {
 				if len(a) != 1 {
@@ -585,6 +595,13 @@ func parseConfig(cmd *Command, conf *proxy.Config, args []string) error {
 				ic.UnixSocket = u[0]
 			}
 
+			if upok {
+				if len(up) != 1 {
+					return newBadCommandError(fmt.Sprintf("unix-socket-path query param should be only one value: %q", a))
+				}
+				ic.UnixSocketPath = up[0]
+			}
+
 			ic.IAMAuthN, err = parseBoolOpt(q, "auto-iam-authn")
 			if err != nil {
 				return err

cmd/root_test.go

@@ -286,6 +286,15 @@ func TestNewCommandArguments(t *testing.T) {
 				}},
 			}),
 		},
+		{
+			desc: "using the unix socket path query param",
+			args: []string{"proj:region:inst?unix-socket-path=/path/to/dir/"},
+			want: withDefaults(&proxy.Config{
+				Instances: []proxy.InstanceConnConfig{{
+					UnixSocketPath: "/path/to/dir/",
+				}},
+			}),
+		},
 		{
 			desc: "using the iam authn login flag",
 			args: []string{"--auto-iam-authn", "proj:region:inst"},