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chmod.go
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chmod.go
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// Copyright 2016-2017 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Change modifier bits of a file.
//
// Synopsis:
// chmod MODE FILE...
//
// Desription:
// MODE is a three character octal value.
package main
import (
"flag"
"fmt"
"log"
"os"
"path/filepath"
"strconv"
)
var (
recursive bool
reference string
)
func init() {
flag.BoolVar(&recursive,
"R",
false,
"do changes recursively")
flag.BoolVar(&recursive,
"recursive",
false,
"do changes recursively")
flag.StringVar(&reference,
"reference",
"",
"use mode from reference file")
}
func main() {
flag.Parse()
if len(flag.Args()) < 1 {
fmt.Fprintf(os.Stderr, "Usage of %s: [mode] filepath\n", os.Args[0])
flag.PrintDefaults()
os.Exit(1)
}
if len(flag.Args()) < 2 && reference == "" {
fmt.Fprintf(os.Stderr, "Usage of %s: [mode] filepath\n", os.Args[0])
flag.PrintDefaults()
os.Exit(1)
}
var mode os.FileMode
var fileList []string
if reference != "" {
fi, err := os.Stat(reference)
if err != nil {
log.Fatalf("bad reference file: %v", err)
}
mode = fi.Mode()
fileList = flag.Args()
} else {
modeString := flag.Args()[0]
octval, err := strconv.ParseUint(modeString, 8, 32)
if err != nil {
log.Fatalf("Unable to decode mode %q. Please use an octal value: %v", modeString, err)
} else if octval > 0777 {
log.Fatalf("Invalid octal value %0o. Value should be less than or equal to 0777.", octval)
}
mode = os.FileMode(octval)
fileList = flag.Args()[1:]
}
var exitError bool
for _, name := range fileList {
if recursive {
err := filepath.Walk(name, func(path string,
info os.FileInfo,
err error) error {
return os.Chmod(path, mode)
})
if err != nil {
log.Printf("%v", err)
exitError = true
}
} else {
if err := os.Chmod(name, mode); err != nil {
log.Printf("%v", err)
exitError = true
}
}
}
if exitError {
os.Exit(1)
}
}