From 8f5ba05ec4e0f58da80137f24fcb4ab27a2998fe Mon Sep 17 00:00:00 2001
From: "Jason T. Greene" <jason.greene@redhat.com>
Date: Sat, 29 Jan 2022 03:10:28 -0600
Subject: Initial implementation of mac forwarding using a privileged docker
 sock claim helper

Signed-off-by: Jason T. Greene <jason.greene@redhat.com>
---
 cmd/podman-mac-helper/service.go | 85 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 cmd/podman-mac-helper/service.go

(limited to 'cmd/podman-mac-helper/service.go')

diff --git a/cmd/podman-mac-helper/service.go b/cmd/podman-mac-helper/service.go
new file mode 100644
index 000000000..65cd89f34
--- /dev/null
+++ b/cmd/podman-mac-helper/service.go
@@ -0,0 +1,85 @@
+//go:build darwin
+// +build darwin
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+const (
+	trigger = "GO\n"
+	fail    = "NO"
+	success = "OK"
+)
+
+var serviceCmd = &cobra.Command{
+	Use:    "service",
+	Short:  "services requests",
+	Long:   "services requests",
+	PreRun: silentUsage,
+	Run:    serviceRun,
+	Hidden: true,
+}
+
+func init() {
+	rootCmd.AddCommand(serviceCmd)
+}
+
+func serviceRun(cmd *cobra.Command, args []string) {
+	info, err := os.Stdin.Stat()
+	if err != nil || info.Mode()&fs.ModeSocket == 0 {
+		fmt.Fprintln(os.Stderr, "This is an internal command that is not intended for standard terminal usage")
+		os.Exit(1)
+	}
+
+	os.Exit(service())
+}
+
+func service() int {
+	defer os.Stdout.Close()
+	defer os.Stdin.Close()
+	defer os.Stderr.Close()
+	if len(os.Args) < 3 {
+		fmt.Print(fail)
+		return 1
+	}
+	target := os.Args[2]
+
+	request := make(chan bool)
+	go func() {
+		buf := make([]byte, 3)
+		_, err := io.ReadFull(os.Stdin, buf)
+		request <- err == nil && string(buf) == trigger
+	}()
+
+	valid := false
+	select {
+	case valid = <-request:
+	case <-time.After(5 * time.Second):
+	}
+
+	if !valid {
+		fmt.Println(fail)
+		return 2
+	}
+
+	err := os.Remove(dockerSock)
+	if err == nil || os.IsNotExist(err) {
+		err = os.Symlink(target, dockerSock)
+	}
+
+	if err != nil {
+		fmt.Print(fail)
+		return 3
+	}
+
+	fmt.Print(success)
+	return 0
+}
-- 
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