-
-
Save solomonope/89d608160a1abffa82ae0373f34e5554 to your computer and use it in GitHub Desktop.
containersched minicontainer
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "fmt" | |
| "os" | |
| "os/exec" | |
| "syscall" | |
| ) | |
| func main() { | |
| switch os.Args[1] { | |
| case "run": | |
| parent() | |
| case "child": | |
| child() | |
| default: | |
| panic("wat should I do") | |
| } | |
| } | |
| func parent() { | |
| cmd := exec.Command("/proc/self/exe", append([]string{"child"}, os.Args[2:]...)...) | |
| cmd.SysProcAttr = &syscall.SysProcAttr{ | |
| Cloneflags: syscall.CLONE_NEWUTS | syscall.CLONE_NEWPID | syscall.CLONE_NEWNS, | |
| } | |
| cmd.Stdin = os.Stdin | |
| cmd.Stdout = os.Stdout | |
| cmd.Stderr = os.Stderr | |
| if err := cmd.Run(); err != nil { | |
| fmt.Println("ERROR", err) | |
| os.Exit(1) | |
| } | |
| } | |
| func child() { | |
| must(syscall.Mount("rootfs", "rootfs", "", syscall.MS_BIND, "")) | |
| must(os.MkdirAll("rootfs/oldrootfs", 0700)) | |
| must(syscall.PivotRoot("rootfs", "rootfs/oldrootfs")) | |
| must(os.Chdir("/")) | |
| cmd := exec.Command(os.Args[2], os.Args[3:]...) | |
| cmd.Stdin = os.Stdin | |
| cmd.Stdout = os.Stdout | |
| cmd.Stderr = os.Stderr | |
| if err := cmd.Run(); err != nil { | |
| fmt.Println("ERROR", err) | |
| os.Exit(1) | |
| } | |
| } | |
| func must(err error) { | |
| if err != nil { | |
| panic(err) | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment