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main.go
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main.go
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package main
import (
"fmt"
"os"
"github.com/lxc/lxd/shared"
)
func help(me string, status int) {
fmt.Printf("Usage: %s directory [-t] [-r] <range1> [<range2> ...]\n", me)
fmt.Printf(" -t implies test mode. No file ownerships will be changed.\n")
fmt.Printf(" -r means reverse, that is shift the uids out of the container.\n")
fmt.Printf("\n")
fmt.Printf(" A range is [u|b|g]:<first_container_id:first_host_id:range>.\n")
fmt.Printf(" where u means shift uids, g means shift gids, b means shift both.\n")
fmt.Printf(" For example: %s directory b:0:100000:65536 u:10000:1000:1\n", me)
os.Exit(status)
}
func main() {
if err := run(); err != nil {
fmt.Printf("Error: %q\n", err)
help(os.Args[0], 1)
}
}
func run() error {
if len(os.Args) < 3 {
if len(os.Args) > 1 && (os.Args[1] == "-h" || os.Args[1] == "--help" || os.Args[1] == "help") {
help(os.Args[0], 0)
} else {
help(os.Args[0], 1)
}
}
directory := os.Args[1]
idmap := shared.IdmapSet{}
testmode := false
reverse := false
for pos := 2; pos < len(os.Args); pos++ {
switch os.Args[pos] {
case "-r", "--reverse":
reverse = true
case "t", "-t", "--test", "test":
testmode = true
default:
var err error
idmap, err = idmap.Append(os.Args[pos])
if err != nil {
return err
}
}
}
if idmap.Len() == 0 {
fmt.Printf("No idmaps given\n")
help(os.Args[0], 1)
}
if !testmode && os.Geteuid() != 0 {
fmt.Printf("This must be run as root\n")
os.Exit(1)
}
if reverse {
return idmap.UidshiftFromContainer(directory, testmode)
}
return idmap.UidshiftIntoContainer(directory, testmode)
}