🐳 runtime dockerizer
This is a PoC of a go program that calls the Docker API, inject itself (the binary) and switch to Docker for the execution.
It's like syscall.Exec within Docker.
import (
"flag"
"fmt"
"moul.io/dockerself"
)
func main() {
dockerize := flag.Bool("dockerize", false, "dockerize")
flag.Parse()
if *dockerize {
dockerself.Dockerize("ubuntu")
return
}
if dockerize.WithinDocker() {
fmt.Println("I'm inside the matrix (docker)")
} else {
fmt.Println("I'm in the real world :(")
}
}$ ./example
I'm in the real world :(
$ ./example --dockerize
I'm inside the matrix (docker)See dockerself-example.
# go get moul.io/dockerself/dockerself-example# dockerself-example
within docker: false
env: [XDG_SESSION_ID=93 SHELL=/bin/bash TERM=screen SSH_CLIENT=82.254.90.14 50450 22 SSH_TTY=/dev/pts/0 LC_ALL=en_US.UTF-8 USER=moul ...]
starting interactive `/bin/sh` session...
$ ls -la
total 20
drwxrwxr-x 2 moul moul 4096 Feb 14 16:48 .
drwxrwxr-x 7 moul moul 4096 Feb 14 16:48 ..
-rw-rw-r-- 1 moul moul 95 Feb 14 16:48 go.mod
-rw-rw-r-- 1 moul moul 2578 Feb 14 16:48 go.sum
-rw-rw-r-- 1 moul moul 348 Feb 14 16:48 main.go
$# dockerself-example --dockerize
within docker: true
env: [PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=72a73eaf8cbb TERM=xterm HOME=/root]
starting interactive `/bin/sh` session...
$ ls -la
total 10492
drwxr-xr-x 33 root root 4096 Feb 14 15:50 .
drwxr-xr-x 33 root root 4096 Feb 14 15:50 ..
-rwxr-xr-x 1 root root 0 Feb 14 15:50 .dockerenv
drwxr-xr-x 2 root root 4096 Feb 4 21:05 bin
drwxr-xr-x 2 root root 4096 Apr 24 2018 boot
drwxr-xr-x 5 root root 360 Feb 14 15:50 dev
-rwxr-xr-x 1 root root 10667575 Jan 1 1970 dockerself
drwxr-xr-x 31 root root 4096 Feb 14 15:50 etc
drwxr-xr-x 2 root root 4096 Apr 24 2018 home
drwxr-xr-x 8 root root 4096 May 23 2017 lib
drwxr-xr-x 2 root root 4096 Feb 4 21:03 lib64
drwxr-xr-x 2 root root 4096 Feb 4 21:02 media
drwxr-xr-x 2 root root 4096 Feb 4 21:02 mnt
drwxr-xr-x 2 root root 4096 Feb 4 21:02 opt
dr-xr-xr-x 266 root root 0 Feb 14 15:50 proc
drwx------ 2 root root 4096 Feb 4 21:04 root
drwxr-xr-x 5 root root 4096 Feb 6 03:37 run
drwxr-xr-x 2 root root 4096 Feb 6 03:37 sbin
drwxr-xr-x 2 root root 4096 Feb 4 21:02 srv
dr-xr-xr-x 13 root root 0 Oct 13 20:12 sys
drwxrwxrwt 2 root root 4096 Feb 4 21:05 tmp
drwxr-xr-x 11 root root 4096 Feb 4 21:02 usr
drwxr-xr-x 13 root root 4096 Feb 4 21:04 var
$
container exited.
#
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