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filesystem.go
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/
filesystem.go
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// Copyright 2017 Intel Corporation
//
// 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 swupd
import (
"fmt"
"os"
"path/filepath"
"strings"
)
const illegalChars = ";&|*`/<>\\\"'"
func filenameBlacklisted(fname string) bool {
return strings.ContainsAny(fname, illegalChars)
}
// createFileRecord creates a manifest File entry from a file
func (m *Manifest) createFileRecord(rootPath, path, removePrefix string, fi os.FileInfo) error {
file, err := recordFromFile(rootPath, path, removePrefix, fi)
if err != nil {
return err
}
// this is a file to skip
if file == nil {
return nil
}
m.Files = append(m.Files, file)
m.Header.ContentSize += uint64(fi.Size())
return nil
}
// recordFromFile creates a struct File record from an os.FileInfo object
// this function sets the Name, Info, Type, and Hash fields
func recordFromFile(rootPath, path, removePrefix string, fi os.FileInfo) (*File, error) {
var file *File
var fname string
if removePrefix != "" {
fname = strings.TrimPrefix(path, removePrefix)
rootPath = removePrefix
} else {
fname = strings.TrimPrefix(path, rootPath)
}
if fname == "" {
return nil, nil
}
if filenameBlacklisted(filepath.Base(fname)) {
return nil, fmt.Errorf("%s is a blacklisted file name", fname)
}
file = &File{
Name: fname,
Info: fi,
}
switch mode := fi.Mode(); {
case mode.IsRegular():
file.Type = TypeFile
case mode.IsDir():
file.Type = TypeDirectory
case mode&os.ModeSymlink != 0:
file.Type = TypeLink
default:
return nil, fmt.Errorf("%v is an unsupported file type", file.Name)
}
fh, err := Hashcalc(filepath.Join(rootPath, file.Name))
if err != nil {
return nil, fmt.Errorf("hash calculation error: %v", err)
}
file.Hash = fh
return file, nil
}
// createManifestRecord wraps createFileRecord to create a Manifest record for a MoM
func (m *Manifest) createManifestRecord(rootPath, path string, version uint32) error {
fi, err := os.Stat(path)
if err != nil {
return err
}
file, err := recordFromFile(rootPath, path, "", fi)
if err != nil {
if strings.Contains(err.Error(), "hash calculation error") {
return err
}
fmt.Fprintf(os.Stderr, "Warning: %s\n", err)
}
// this is a file to skip
if file == nil {
return nil
}
// Only the bundle name should be part of the name in the manifest
file.Name = strings.Replace(file.Name, "/Manifest.", "", -1)
file.Type = TypeManifest
file.Version = version
m.Files = append(m.Files, file)
return nil
}
func (m *Manifest) addFilesFromChroot(rootPath, removePrefix string) error {
if _, err := os.Stat(rootPath); os.IsNotExist(err) {
return err
}
err := filepath.Walk(rootPath, func(path string, fi os.FileInfo, err error) error {
err = m.createFileRecord(rootPath, path, removePrefix, fi)
if err != nil {
if strings.Contains(err.Error(), "hash calculation error") {
return err
}
fmt.Fprintf(os.Stderr, "Warning: %s\n", err)
}
return nil
})
return err
}
func exists(path string) bool {
if _, err := os.Stat(path); os.IsNotExist(err) {
return false
}
return true
}