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// Copyright 2018 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.
// Package cmp compares trees of files.
//
// cmp is an internal package for pkg/cp's and cmds/core/cp's tests.
package cmp
import (
"fmt"
"os"
"path/filepath"
"reflect"
"github.com/u-root/uio/cp"
"github.com/u-root/uio/uio"
)
// isEqualFile compare two files by checksum.
func isEqualFile(fpath1, fpath2 string) error {
file1, err := os.Open(fpath1)
if err != nil {
return err
}
defer file1.Close()
file2, err := os.Open(fpath2)
if err != nil {
return err
}
defer file2.Close()
if !uio.ReaderAtEqual(file1, file2) {
return fmt.Errorf("%q and %q do not have equal content", fpath1, fpath2)
}
return nil
}
func readDirNames(path string) ([]string, error) {
entries, err := os.ReadDir(path)
if err != nil {
return nil, err
}
var basenames []string
for _, entry := range entries {
basenames = append(basenames, entry.Name())
}
return basenames, nil
}
func stat(o cp.Options, path string) (os.FileInfo, error) {
if o.NoFollowSymlinks {
return os.Lstat(path)
}
return os.Stat(path)
}
// IsEqualTree compare the content in the file trees in src and dst paths.
func IsEqualTree(o cp.Options, src, dst string) error {
srcInfo, err := stat(o, src)
if err != nil {
return err
}
dstInfo, err := stat(o, dst)
if err != nil {
return err
}
if sm, dm := srcInfo.Mode()&os.ModeType, dstInfo.Mode()&os.ModeType; sm != dm {
return fmt.Errorf("mismatched mode: %q has mode %s while %q has mode %s", src, sm, dst, dm)
}
switch {
case srcInfo.Mode().IsDir():
srcEntries, err := readDirNames(src)
if err != nil {
return err
}
dstEntries, err := readDirNames(dst)
if err != nil {
return err
}
// os.ReadDir guarantees these are sorted.
if !reflect.DeepEqual(srcEntries, dstEntries) {
return fmt.Errorf("directory contents did not match:\n%q had %v\n%q had %v", src, srcEntries, dst, dstEntries)
}
for _, basename := range srcEntries {
if err := IsEqualTree(o, filepath.Join(src, basename), filepath.Join(dst, basename)); err != nil {
return err
}
}
return nil
case srcInfo.Mode().IsRegular():
return isEqualFile(src, dst)
case srcInfo.Mode()&os.ModeSymlink == os.ModeSymlink:
srcTarget, err := os.Readlink(src)
if err != nil {
return err
}
dstTarget, err := os.Readlink(dst)
if err != nil {
return err
}
if srcTarget != dstTarget {
return fmt.Errorf("target mismatch: symlink %q had target %q, while %q had target %q", src, srcTarget, dst, dstTarget)
}
return nil
default:
return fmt.Errorf("unsupported mode: %s", srcInfo.Mode())
}
}
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