Set umask=0 when creating unix sockets (#743)

Signed-off-by: eternal-flame-AD <yume@yumechi.jp>

runner/runner.go

@@ -77,6 +77,9 @@ func startListening(connectionType, listenAddr string, port, keepAlive int) (net
 	network, addr := getNetworkAndAddr(listenAddr, port)
 	lc := net.ListenConfig{KeepAlive: time.Duration(keepAlive) * time.Second}
 
+	oldMask := umask(0)
+	defer umask(oldMask)
+
 	l, err := lc.Listen(context.Background(), network, addr)
 	if err == nil {
 		fmt.Println("Started listening for", connectionType, "on", l.Addr().Network(), l.Addr().String())

runner/umask.go

@@ -0,0 +1,7 @@
+//go:build unix
+
+package runner
+
+import "syscall"
+
+var umask = syscall.Umask

runner/umask_fallback.go

@@ -0,0 +1,7 @@
+//go:build !unix
+
+package runner
+
+func umask(_ int) int {
+	return 0
+}