Go library and command line tool for decomposing docker images.
NAME:
undocker - Decompose docker images.
USAGE:
undocker [global options] command [command options] [arguments...]
VERSION:
0.1.3
COMMANDS:
extract, e Extract to rootfs.
show, s Show image informations
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--registry-url value, -r value docker registry url [$REGISTRY_URL]
--registry-user value, -u value docker registry login username [$REGISTRY_USER]
--registry-pass value, -p value docker registry login password [$REGISTRY_PASS]
--help, -h show help
--version, -v print the version
homebrew tap:
$ brew install tokibi/tap/undockermanually:
Download binany from releases page
go get:
$ go get github.com/tokibi/undocker/cmd/undockerExtract from local images.
$ undocker extract busybox:latest ./image
$ ls ./image
bin/ dev/ etc/ home/ root/ tmp/ usr/ var/Extract directly from docker registry.
$ export REGISTRY_USER=xxx # optional
$ export REGISTRY_PASS=xxx # optional
$ undocker -r "https://registry-1.docker.io/" extract busybox:latest ./imageShow image config.
$ undocker show config busybox:latest | jq
{
"architecture": "amd64",
"config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"sh"
],
...Extract from local images.
func main() {
dst := "./image"
api, err := undocker.NewDockerAPI()
if err != nil {
log.Fatal(err)
}
api.Image("busybox", "latest").Extract(dst, false)
}Extract directly from docker registry.
func main() {
url := "https://registry-1.docker.io/"
username := ""
password := ""
dst := "./image"
registry, err := undocker.NewRegistry(url, username, password)
if err != nil {
log.Fatal(err)
}
registry.Image("busybox", "latest").Extract(dst, false)
}func main() {
api, _ := undocker.NewDockerAPI()
config, err := api.Image("busybox", "latest").Config()
if err != nil {
return err
}
fmt.Println(config.architecture)
}
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