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|
package main
import (
"flag"
"fmt"
"io"
"io/ioutil"
"os"
)
var (
// Setup command parsing
cmdName = os.Args[0]
set = flag.NewFlagSet(cmdName, flag.ContinueOnError)
// Flags for our command
forceFlag = set.Bool("force", false, "Suppress all warnings and do not prompt")
versionFlag = set.Bool("version", false, "Print the fscrypt version.")
helpFlag = set.Bool("help", false, "Print this help text.")
// fscrypt's version (set by Makefile)
version string
)
const (
manPage = "fscrypt-ext4(8)"
manBrief = "enable or disable encryption on an ext4 filesystem"
usageFmt = `
Usage:
%[1]s [enable | disable] <mountpoint> [--force]
%[1]s --help
%[1]s --version
Arguments:
<mountpoint> - path to an ext4 filesystem
`
)
func printUsageAndExit(err error) {
var w io.Writer
var rc int
if err == nil {
w = os.Stdout
rc = 0
fmt.Fprintf(w, "%s - %s\n", cmdName, manBrief)
} else {
w = os.Stderr
rc = 1
fmt.Fprintf(w, "%s: %v\n", cmdName, err)
}
fmt.Fprintf(w, usageFmt, cmdName)
fmt.Fprintln(w, "\nOptions:")
set.VisitAll(func(f *flag.Flag) {
fmt.Fprintf(w, "\t--%s\n\t\t%s\n", f.Name, f.Usage)
})
fmt.Fprintf(w, "\nSee the %s man page for more info.\n", manPage)
os.Exit(rc)
}
func main() {
set.SetOutput(ioutil.Discard)
if err := set.Parse(os.Args[1:]); err != nil {
printUsageAndExit(err)
}
if *helpFlag {
printUsageAndExit(nil)
}
if *versionFlag {
fmt.Println(version)
return
}
if set.NArg() != 2 {
printUsageAndExit(fmt.Errorf("expected 2 arguments, got %d", set.NArg()))
}
command, mountpoint := set.Arg(0), set.Arg(1)
switch command {
case "enable":
fmt.Println("Enabling encryption!!")
case "disable":
fmt.Println("Disabling encryption!!")
default:
printUsageAndExit(fmt.Errorf("invalid command %q", command))
}
if isExt4EncryptionEnabled(mountpoint) {
fmt.Printf("%q has encryption\n", mountpoint)
} else {
fmt.Printf("%q doesn't have encryption\n", mountpoint)
}
}
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