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package main
import (
"bytes"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"sync"
"syscall"
"github.com/hanwen/go-fuse/fuse"
"github.com/rfjakob/gocryptfs/internal/exitcodes"
"github.com/rfjakob/gocryptfs/internal/fusefrontend"
"github.com/rfjakob/gocryptfs/internal/tlog"
)
type fsckObj struct {
fs *fusefrontend.FS
// List of corrupt files
corruptList []string
// Protects corruptList
corruptListLock sync.Mutex
// stop a running watchMitigatedCorruptions thread
watchDone chan struct{}
}
func (ck *fsckObj) markCorrupt(path string) {
ck.corruptListLock.Lock()
ck.corruptList = append(ck.corruptList, path)
ck.corruptListLock.Unlock()
}
// Watch for mitigated corruptions that occour during OpenDir()
func (ck *fsckObj) watchMitigatedCorruptionsOpenDir(path string) {
for {
select {
case item := <-ck.fs.MitigatedCorruptions:
fmt.Printf("fsck: corrupt entry in dir %q: %q\n", path, item)
ck.markCorrupt(filepath.Join(path, item))
case <-ck.watchDone:
return
}
}
}
// Recursively check dir for corruption
func (ck *fsckObj) dir(path string) {
//fmt.Printf("ck.dir %q\n", path)
ck.xattrs(path)
// Run OpenDir and catch transparently mitigated corruptions
go ck.watchMitigatedCorruptionsOpenDir(path)
entries, status := ck.fs.OpenDir(path, nil)
ck.watchDone <- struct{}{}
// Also catch non-mitigated corruptions
if !status.Ok() {
ck.markCorrupt(path)
fmt.Printf("fsck: error opening dir %q: %v\n", path, status)
return
}
// Sort alphabetically
sort.Sort(sortableDirEntries(entries))
for _, entry := range entries {
if entry.Name == "." || entry.Name == ".." {
continue
}
nextPath := filepath.Join(path, entry.Name)
filetype := entry.Mode & syscall.S_IFMT
//fmt.Printf(" %q %x\n", entry.Name, entry.Mode)
switch filetype {
case syscall.S_IFDIR:
ck.dir(nextPath)
case syscall.S_IFREG:
ck.file(nextPath)
case syscall.S_IFLNK:
ck.symlink(nextPath)
case syscall.S_IFIFO, syscall.S_IFSOCK, syscall.S_IFBLK, syscall.S_IFCHR:
// nothing to check
default:
fmt.Printf("fsck: unhandled file type %x\n", filetype)
}
}
}
func (ck *fsckObj) symlink(path string) {
_, status := ck.fs.Readlink(path, nil)
if !status.Ok() {
ck.markCorrupt(path)
fmt.Printf("fsck: error reading symlink %q: %v\n", path, status)
}
}
// Watch for mitigated corruptions that occour during Read()
func (ck *fsckObj) watchMitigatedCorruptionsRead(path string) {
for {
select {
case item := <-ck.fs.MitigatedCorruptions:
fmt.Printf("fsck: corrupt file %q (inode %s)\n", path, item)
ck.markCorrupt(path)
case <-ck.watchDone:
return
}
}
}
// Check file for corruption
func (ck *fsckObj) file(path string) {
//fmt.Printf("ck.file %q\n", path)
ck.xattrs(path)
f, status := ck.fs.Open(path, syscall.O_RDONLY, nil)
if !status.Ok() {
ck.markCorrupt(path)
fmt.Printf("fsck: error opening file %q: %v\n", path, status)
return
}
defer f.Release()
allZero := make([]byte, fuse.MAX_KERNEL_WRITE)
buf := make([]byte, fuse.MAX_KERNEL_WRITE)
var off int64
// Read() through the whole file and catch transparently mitigated corruptions
go ck.watchMitigatedCorruptionsRead(path)
defer func() { ck.watchDone <- struct{}{} }()
for {
result, status := f.Read(buf, off)
if !status.Ok() {
ck.markCorrupt(path)
fmt.Printf("fsck: error reading file %q at offset %d: %v\n", path, off, status)
return
}
// EOF
if result.Size() == 0 {
return
}
off += int64(result.Size())
// If we seem to be in the middle of a file hole, try to skip to the next
// data section.
if bytes.Equal(buf, allZero) {
f2 := f.(*fusefrontend.File)
nextOff, err := f2.SeekData(off)
if err == nil {
off = nextOff
}
}
}
}
// Watch for mitigated corruptions that occour during ListXAttr()
func (ck *fsckObj) watchMitigatedCorruptionsListXAttr(path string) {
for {
select {
case item := <-ck.fs.MitigatedCorruptions:
fmt.Printf("fsck: corrupt xattr name on file %q: %q\n", path, item)
ck.markCorrupt(path + " xattr:" + item)
case <-ck.watchDone:
return
}
}
}
// Check xattrs on file/dir at path
func (ck *fsckObj) xattrs(path string) {
// Run ListXAttr() and catch transparently mitigated corruptions
go ck.watchMitigatedCorruptionsListXAttr(path)
attrs, status := ck.fs.ListXAttr(path, nil)
ck.watchDone <- struct{}{}
// Also catch non-mitigated corruptions
if !status.Ok() {
fmt.Printf("fsck: error listing xattrs on %q: %v\n", path, status)
ck.markCorrupt(path)
return
}
for _, a := range attrs {
_, status := ck.fs.GetXAttr(path, a, nil)
if !status.Ok() {
fmt.Printf("fsck: error reading xattr %q from %q: %v\n", a, path, status)
ck.markCorrupt(path)
}
}
}
func fsck(args *argContainer) {
if args.reverse {
tlog.Fatal.Printf("Running -fsck with -reverse is not supported")
os.Exit(exitcodes.Usage)
}
args.allow_other = false
pfs, wipeKeys := initFuseFrontend(args)
fs := pfs.(*fusefrontend.FS)
fs.MitigatedCorruptions = make(chan string)
ck := fsckObj{
fs: fs,
watchDone: make(chan struct{}),
}
ck.dir("")
wipeKeys()
if len(ck.corruptList) == 0 {
tlog.Info.Printf("fsck summary: no problems found\n")
return
}
fmt.Printf("fsck summary: %d corrupt files\n", len(ck.corruptList))
os.Exit(exitcodes.FsckErrors)
}
type sortableDirEntries []fuse.DirEntry
func (s sortableDirEntries) Len() int {
return len(s)
}
func (s sortableDirEntries) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s sortableDirEntries) Less(i, j int) bool {
return strings.Compare(s[i].Name, s[j].Name) < 0
}
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