dude, wtf is this - we have a package that read this file:
```go
import "github.com/dotcloud/docker/pkg/user"
// ...
groups, err := user.ParseGroupFilter(func(g *user.Group) bool {
	return g.Name == "docker"
})
// and now, if there's a match (and no errors), you have groups[0].Gid and groups[0].Name
```