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/*
* ext4.go - Handles command line processing for fscrypt-ext4.
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
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 printAndExit(err error, printUsage bool) {
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)
}
if printUsage {
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 {
printAndExit(err, true)
}
if *helpFlag {
printAndExit(nil, true)
}
if *versionFlag {
fmt.Println(version)
return
}
if set.NArg() != 2 {
printAndExit(fmt.Errorf("expected 2 arguments (got %d)", set.NArg()), true)
}
_, err := NewExt4Filesystem(set.Arg(1))
if err != nil {
printAndExit(err, false)
}
switch command := set.Arg(0); command {
case "enable":
fmt.Println("Enabling encryption not implemented")
case "disable":
fmt.Println("Disabling encryption not implemented")
default:
printAndExit(fmt.Errorf("invalid command %q", command), true)
}
}
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