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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/exec"
"strings"
"sync"
"github.com/docker/go-connections/sockets"
"github.com/docker/go-plugins-helpers/volume"
"github.com/trajano/docker-volume-plugins/mounted-volume"
)
type osMountedDriver struct {
mountType string
mountOptions string
mountedvolume.Driver
}
// Download package waitgroup
var downloadPackageWg sync.WaitGroup
func (p *osMountedDriver) Validate(req *volume.CreateRequest) error {
_, deviceDefinedInOpts := req.Options["device"]
if !deviceDefinedInOpts {
return fmt.Errorf("device is required in driver_opts")
}
return nil
}
func (p *osMountedDriver) MountOptions(req *volume.CreateRequest) []string {
return []string{"-t", p.mountType, "-o", p.mountOptions, req.Options["device"]}
}
func (p *osMountedDriver) PreMount(req *volume.MountRequest) error {
downloadPackageWg.Wait()
mountedvolume.UnhideRoot()
return nil
}
func (p *osMountedDriver) PostMount(req *volume.MountRequest) {
mountedvolume.HideRoot()
}
func downloadPackages() {
defer downloadPackageWg.Done()
args := []string{"install", "-y"}
args = append(args, strings.Split(os.Getenv("PACKAGES"), ",")...)
cmd := exec.Command("yum", args...)
if out, err := cmd.CombinedOutput(); err != nil {
log.Println(string(out))
log.Fatalf("There was an error %s when downloading the packages %s", err, args)
}
log.Println("completed yum", args)
postInstallCmd := exec.Command("/bin/bash", "-c", os.Getenv("POSTINSTALL"))
if out, err := postInstallCmd.CombinedOutput(); err != nil {
log.Println(string(out))
log.Fatalf("There was an error %s when executing post install command %s", err, postInstallCmd.Args)
}
}
func buildDriver() *osMountedDriver {
go downloadPackages()
d := &osMountedDriver{
Driver: *mountedvolume.NewDriver("mount", true, "osmounted", "local"),
mountType: os.Getenv("MOUNT_TYPE"),
mountOptions: os.Getenv("MOUNT_OPTIONS"),
}
d.Init(d)
mountedvolume.HideRoot()
return d
}
func main() {
log.SetFlags(0)
packages := os.Getenv("PACKAGES")
mountType := os.Getenv("MOUNT_TYPE")
mountOptions := os.Getenv("MOUNT_OPTIONS")
if packages == "" {
log.Fatal("PACKAGES needs to be set")
}
if mountType == "" {
log.Fatal("MOUNT_TYPE needs to be set")
}
helpPtr := flag.Bool("h", false, "Show help")
flag.Parse()
if *helpPtr {
flag.Usage()
return
}
downloadPackageWg.Add(1)
log.Println("PACKAGES=" + packages)
log.Println("POSTINSTALL=" + os.Getenv("POSTINSTALL"))
log.Println("MOUNT_TYPE=" + mountType)
log.Println("MOUNT_OPTIONS=" + mountOptions)
d := buildDriver()
log.Println("Serving UNIX socket")
h := volume.NewHandler(d)
l, err := sockets.NewUnixSocket("/dockerplugins/osmounted.sock", 0)
if err != nil {
log.Fatal(err)
}
h.Serve(l)
}