mirror of
https://github.com/octoleo/restic.git
synced 2024-12-23 19:38:57 +00:00
817 lines
19 KiB
Go
817 lines
19 KiB
Go
package restic
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"sort"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/restic/chunker"
|
|
"github.com/restic/restic/backend"
|
|
"github.com/restic/restic/debug"
|
|
"github.com/restic/restic/pack"
|
|
"github.com/restic/restic/pipe"
|
|
"github.com/restic/restic/repository"
|
|
|
|
"github.com/juju/errors"
|
|
)
|
|
|
|
const (
|
|
maxConcurrentBlobs = 32
|
|
maxConcurrency = 10
|
|
)
|
|
|
|
var archiverAbortOnAllErrors = func(str string, fi os.FileInfo, err error) error { return err }
|
|
var archiverAllowAllFiles = func(string, os.FileInfo) bool { return true }
|
|
|
|
// Archiver is used to backup a set of directories.
|
|
type Archiver struct {
|
|
repo *repository.Repository
|
|
knownBlobs struct {
|
|
backend.IDSet
|
|
sync.Mutex
|
|
}
|
|
|
|
blobToken chan struct{}
|
|
|
|
Error func(dir string, fi os.FileInfo, err error) error
|
|
SelectFilter pipe.SelectFunc
|
|
Excludes []string
|
|
}
|
|
|
|
// NewArchiver returns a new archiver.
|
|
func NewArchiver(repo *repository.Repository) *Archiver {
|
|
arch := &Archiver{
|
|
repo: repo,
|
|
blobToken: make(chan struct{}, maxConcurrentBlobs),
|
|
knownBlobs: struct {
|
|
backend.IDSet
|
|
sync.Mutex
|
|
}{
|
|
IDSet: backend.NewIDSet(),
|
|
},
|
|
}
|
|
|
|
for i := 0; i < maxConcurrentBlobs; i++ {
|
|
arch.blobToken <- struct{}{}
|
|
}
|
|
|
|
arch.Error = archiverAbortOnAllErrors
|
|
arch.SelectFilter = archiverAllowAllFiles
|
|
|
|
return arch
|
|
}
|
|
|
|
// isKnownBlob returns true iff the blob is not yet in the list of known blobs.
|
|
// When the blob is not known, false is returned and the blob is added to the
|
|
// list. This means that the caller false is returned to is responsible to save
|
|
// the blob to the backend.
|
|
func (arch *Archiver) isKnownBlob(id backend.ID) bool {
|
|
arch.knownBlobs.Lock()
|
|
defer arch.knownBlobs.Unlock()
|
|
|
|
if arch.knownBlobs.Has(id) {
|
|
return true
|
|
}
|
|
|
|
arch.knownBlobs.Insert(id)
|
|
|
|
_, err := arch.repo.Index().Lookup(id)
|
|
if err == nil {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Save stores a blob read from rd in the repository.
|
|
func (arch *Archiver) Save(t pack.BlobType, id backend.ID, length uint, rd io.Reader) error {
|
|
debug.Log("Archiver.Save", "Save(%v, %v)\n", t, id.Str())
|
|
|
|
if arch.isKnownBlob(id) {
|
|
debug.Log("Archiver.Save", "blob %v is known\n", id.Str())
|
|
return nil
|
|
}
|
|
|
|
err := arch.repo.SaveFrom(t, &id, length, rd)
|
|
if err != nil {
|
|
debug.Log("Archiver.Save", "Save(%v, %v): error %v\n", t, id.Str(), err)
|
|
return err
|
|
}
|
|
|
|
debug.Log("Archiver.Save", "Save(%v, %v): new blob\n", t, id.Str())
|
|
return nil
|
|
}
|
|
|
|
// SaveTreeJSON stores a tree in the repository.
|
|
func (arch *Archiver) SaveTreeJSON(item interface{}) (backend.ID, error) {
|
|
data, err := json.Marshal(item)
|
|
if err != nil {
|
|
return backend.ID{}, err
|
|
}
|
|
data = append(data, '\n')
|
|
|
|
// check if tree has been saved before
|
|
id := backend.Hash(data)
|
|
if arch.isKnownBlob(id) {
|
|
return id, nil
|
|
}
|
|
|
|
return arch.repo.SaveJSON(pack.Tree, item)
|
|
}
|
|
|
|
func (arch *Archiver) reloadFileIfChanged(node *Node, file *os.File) (*Node, error) {
|
|
fi, err := file.Stat()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if fi.ModTime() == node.ModTime {
|
|
return node, nil
|
|
}
|
|
|
|
err = arch.Error(node.path, fi, errors.New("file has changed"))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
node, err = NodeFromFileInfo(node.path, fi)
|
|
if err != nil {
|
|
debug.Log("Archiver.SaveFile", "NodeFromFileInfo returned error for %v: %v", node.path, err)
|
|
return nil, err
|
|
}
|
|
|
|
return node, nil
|
|
}
|
|
|
|
type saveResult struct {
|
|
id backend.ID
|
|
bytes uint64
|
|
}
|
|
|
|
func (arch *Archiver) saveChunk(chunk *chunker.Chunk, p *Progress, token struct{}, file *os.File, resultChannel chan<- saveResult) {
|
|
hash := chunk.Digest
|
|
id := backend.ID{}
|
|
copy(id[:], hash)
|
|
|
|
err := arch.Save(pack.Data, id, chunk.Length, chunk.Reader(file))
|
|
// TODO handle error
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
p.Report(Stat{Bytes: uint64(chunk.Length)})
|
|
arch.blobToken <- token
|
|
resultChannel <- saveResult{id: id, bytes: uint64(chunk.Length)}
|
|
}
|
|
|
|
func waitForResults(resultChannels [](<-chan saveResult)) ([]saveResult, error) {
|
|
results := []saveResult{}
|
|
|
|
for _, ch := range resultChannels {
|
|
results = append(results, <-ch)
|
|
}
|
|
|
|
if len(results) != len(resultChannels) {
|
|
return nil, fmt.Errorf("chunker returned %v chunks, but only %v blobs saved", len(resultChannels), len(results))
|
|
}
|
|
|
|
return results, nil
|
|
}
|
|
|
|
func updateNodeContent(node *Node, results []saveResult) error {
|
|
debug.Log("Archiver.Save", "checking size for file %s", node.path)
|
|
|
|
var bytes uint64
|
|
node.Content = make([]backend.ID, len(results))
|
|
|
|
for i, b := range results {
|
|
node.Content[i] = b.id
|
|
bytes += b.bytes
|
|
|
|
debug.Log("Archiver.Save", " adding blob %s, %d bytes", b.id.Str(), b.bytes)
|
|
}
|
|
|
|
if bytes != node.Size {
|
|
return fmt.Errorf("errors saving node %q: saved %d bytes, wanted %d bytes", node.path, bytes, node.Size)
|
|
}
|
|
|
|
debug.Log("Archiver.SaveFile", "SaveFile(%q): %v blobs\n", node.path, len(results))
|
|
|
|
return nil
|
|
}
|
|
|
|
// SaveFile stores the content of the file on the backend as a Blob by calling
|
|
// Save for each chunk.
|
|
func (arch *Archiver) SaveFile(p *Progress, node *Node) error {
|
|
file, err := node.OpenForReading()
|
|
defer file.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
node, err = arch.reloadFileIfChanged(node, file)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
chnker := chunker.New(file, arch.repo.Config.ChunkerPolynomial, sha256.New())
|
|
resultChannels := [](<-chan saveResult){}
|
|
|
|
for {
|
|
chunk, err := chnker.Next()
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
|
|
if err != nil {
|
|
return errors.Annotate(err, "SaveFile() chunker.Next()")
|
|
}
|
|
|
|
resCh := make(chan saveResult, 1)
|
|
go arch.saveChunk(chunk, p, <-arch.blobToken, file, resCh)
|
|
resultChannels = append(resultChannels, resCh)
|
|
}
|
|
|
|
results, err := waitForResults(resultChannels)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = updateNodeContent(node, results)
|
|
return err
|
|
}
|
|
|
|
func (arch *Archiver) fileWorker(wg *sync.WaitGroup, p *Progress, done <-chan struct{}, entCh <-chan pipe.Entry) {
|
|
defer func() {
|
|
debug.Log("Archiver.fileWorker", "done")
|
|
wg.Done()
|
|
}()
|
|
for {
|
|
select {
|
|
case e, ok := <-entCh:
|
|
if !ok {
|
|
// channel is closed
|
|
return
|
|
}
|
|
|
|
debug.Log("Archiver.fileWorker", "got job %v", e)
|
|
|
|
// check for errors
|
|
if e.Error() != nil {
|
|
debug.Log("Archiver.fileWorker", "job %v has errors: %v", e.Path(), e.Error())
|
|
// TODO: integrate error reporting
|
|
fmt.Fprintf(os.Stderr, "error for %v: %v\n", e.Path(), e.Error())
|
|
// ignore this file
|
|
e.Result() <- nil
|
|
p.Report(Stat{Errors: 1})
|
|
continue
|
|
}
|
|
|
|
node, err := NodeFromFileInfo(e.Fullpath(), e.Info())
|
|
if err != nil {
|
|
// TODO: integrate error reporting
|
|
debug.Log("Archiver.fileWorker", "NodeFromFileInfo returned error for %v: %v", node.path, err)
|
|
e.Result() <- nil
|
|
p.Report(Stat{Errors: 1})
|
|
continue
|
|
}
|
|
|
|
// try to use old node, if present
|
|
if e.Node != nil {
|
|
debug.Log("Archiver.fileWorker", " %v use old data", e.Path())
|
|
|
|
oldNode := e.Node.(*Node)
|
|
// check if all content is still available in the repository
|
|
contentMissing := false
|
|
for _, blob := range oldNode.blobs {
|
|
if ok, err := arch.repo.Backend().Test(backend.Data, blob.Storage.String()); !ok || err != nil {
|
|
debug.Log("Archiver.fileWorker", " %v not using old data, %v (%v) is missing", e.Path(), blob.ID.Str(), blob.Storage.Str())
|
|
contentMissing = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !contentMissing {
|
|
node.Content = oldNode.Content
|
|
node.blobs = oldNode.blobs
|
|
debug.Log("Archiver.fileWorker", " %v content is complete", e.Path())
|
|
}
|
|
} else {
|
|
debug.Log("Archiver.fileWorker", " %v no old data", e.Path())
|
|
}
|
|
|
|
// otherwise read file normally
|
|
if node.Type == "file" && len(node.Content) == 0 {
|
|
debug.Log("Archiver.fileWorker", " read and save %v, content: %v", e.Path(), node.Content)
|
|
err = arch.SaveFile(p, node)
|
|
if err != nil {
|
|
// TODO: integrate error reporting
|
|
fmt.Fprintf(os.Stderr, "error for %v: %v\n", node.path, err)
|
|
// ignore this file
|
|
e.Result() <- nil
|
|
p.Report(Stat{Errors: 1})
|
|
continue
|
|
}
|
|
} else {
|
|
// report old data size
|
|
p.Report(Stat{Bytes: node.Size})
|
|
}
|
|
|
|
debug.Log("Archiver.fileWorker", " processed %v, %d/%d blobs", e.Path(), len(node.Content), len(node.blobs))
|
|
e.Result() <- node
|
|
p.Report(Stat{Files: 1})
|
|
case <-done:
|
|
// pipeline was cancelled
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (arch *Archiver) dirWorker(wg *sync.WaitGroup, p *Progress, done <-chan struct{}, dirCh <-chan pipe.Dir) {
|
|
debug.Log("Archiver.dirWorker", "start")
|
|
defer func() {
|
|
debug.Log("Archiver.dirWorker", "done")
|
|
wg.Done()
|
|
}()
|
|
for {
|
|
select {
|
|
case dir, ok := <-dirCh:
|
|
if !ok {
|
|
// channel is closed
|
|
return
|
|
}
|
|
debug.Log("Archiver.dirWorker", "save dir %v (%d entries), error %v\n", dir.Path(), len(dir.Entries), dir.Error())
|
|
|
|
// ignore dir nodes with errors
|
|
if dir.Error() != nil {
|
|
fmt.Fprintf(os.Stderr, "error walking dir %v: %v\n", dir.Path(), dir.Error())
|
|
dir.Result() <- nil
|
|
p.Report(Stat{Errors: 1})
|
|
continue
|
|
}
|
|
|
|
tree := NewTree()
|
|
|
|
// wait for all content
|
|
for _, ch := range dir.Entries {
|
|
debug.Log("Archiver.dirWorker", "receiving result from %v", ch)
|
|
res := <-ch
|
|
|
|
// if we get a nil pointer here, an error has happened while
|
|
// processing this entry. Ignore it for now.
|
|
if res == nil {
|
|
debug.Log("Archiver.dirWorker", "got nil result?")
|
|
continue
|
|
}
|
|
|
|
// else insert node
|
|
node := res.(*Node)
|
|
tree.Insert(node)
|
|
|
|
if node.Type == "dir" {
|
|
debug.Log("Archiver.dirWorker", "got tree node for %s: %v", node.path, node.Subtree)
|
|
|
|
if node.Subtree.IsNull() {
|
|
panic("invalid null subtree ID")
|
|
}
|
|
}
|
|
}
|
|
|
|
node := &Node{}
|
|
|
|
if dir.Path() != "" && dir.Info() != nil {
|
|
n, err := NodeFromFileInfo(dir.Path(), dir.Info())
|
|
if err != nil {
|
|
n.Error = err.Error()
|
|
dir.Result() <- n
|
|
continue
|
|
}
|
|
node = n
|
|
}
|
|
|
|
if err := dir.Error(); err != nil {
|
|
node.Error = err.Error()
|
|
}
|
|
|
|
id, err := arch.SaveTreeJSON(tree)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
debug.Log("Archiver.dirWorker", "save tree for %s: %v", dir.Path(), id.Str())
|
|
if id.IsNull() {
|
|
panic("invalid null subtree ID return from SaveTreeJSON()")
|
|
}
|
|
|
|
node.Subtree = &id
|
|
|
|
debug.Log("Archiver.dirWorker", "sending result to %v", dir.Result())
|
|
|
|
dir.Result() <- node
|
|
if dir.Path() != "" {
|
|
p.Report(Stat{Dirs: 1})
|
|
}
|
|
case <-done:
|
|
// pipeline was cancelled
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
type archivePipe struct {
|
|
Old <-chan WalkTreeJob
|
|
New <-chan pipe.Job
|
|
}
|
|
|
|
func copyJobs(done <-chan struct{}, in <-chan pipe.Job, out chan<- pipe.Job) {
|
|
var (
|
|
// disable sending on the outCh until we received a job
|
|
outCh chan<- pipe.Job
|
|
// enable receiving from in
|
|
inCh = in
|
|
job pipe.Job
|
|
ok bool
|
|
)
|
|
|
|
for {
|
|
select {
|
|
case <-done:
|
|
return
|
|
case job, ok = <-inCh:
|
|
if !ok {
|
|
// input channel closed, we're done
|
|
debug.Log("copyJobs", "input channel closed, we're done")
|
|
return
|
|
}
|
|
inCh = nil
|
|
outCh = out
|
|
case outCh <- job:
|
|
outCh = nil
|
|
inCh = in
|
|
}
|
|
}
|
|
}
|
|
|
|
type archiveJob struct {
|
|
hasOld bool
|
|
old WalkTreeJob
|
|
new pipe.Job
|
|
}
|
|
|
|
func (a *archivePipe) compare(done <-chan struct{}, out chan<- pipe.Job) {
|
|
defer func() {
|
|
close(out)
|
|
debug.Log("ArchivePipe.compare", "done")
|
|
}()
|
|
|
|
debug.Log("ArchivePipe.compare", "start")
|
|
var (
|
|
loadOld, loadNew bool = true, true
|
|
ok bool
|
|
oldJob WalkTreeJob
|
|
newJob pipe.Job
|
|
)
|
|
|
|
for {
|
|
if loadOld {
|
|
oldJob, ok = <-a.Old
|
|
// if the old channel is closed, just pass through the new jobs
|
|
if !ok {
|
|
debug.Log("ArchivePipe.compare", "old channel is closed, copy from new channel")
|
|
|
|
// handle remaining newJob
|
|
if !loadNew {
|
|
out <- archiveJob{new: newJob}.Copy()
|
|
}
|
|
|
|
copyJobs(done, a.New, out)
|
|
return
|
|
}
|
|
|
|
loadOld = false
|
|
}
|
|
|
|
if loadNew {
|
|
newJob, ok = <-a.New
|
|
// if the new channel is closed, there are no more files in the current snapshot, return
|
|
if !ok {
|
|
debug.Log("ArchivePipe.compare", "new channel is closed, we're done")
|
|
return
|
|
}
|
|
|
|
loadNew = false
|
|
}
|
|
|
|
debug.Log("ArchivePipe.compare", "old job: %v", oldJob.Path)
|
|
debug.Log("ArchivePipe.compare", "new job: %v", newJob.Path())
|
|
|
|
// at this point we have received an old job as well as a new job, compare paths
|
|
file1 := oldJob.Path
|
|
file2 := newJob.Path()
|
|
|
|
dir1 := filepath.Dir(file1)
|
|
dir2 := filepath.Dir(file2)
|
|
|
|
if file1 == file2 {
|
|
debug.Log("ArchivePipe.compare", " same filename %q", file1)
|
|
|
|
// send job
|
|
out <- archiveJob{hasOld: true, old: oldJob, new: newJob}.Copy()
|
|
loadOld = true
|
|
loadNew = true
|
|
continue
|
|
} else if dir1 < dir2 {
|
|
debug.Log("ArchivePipe.compare", " %q < %q, file %q added", dir1, dir2, file2)
|
|
// file is new, send new job and load new
|
|
loadNew = true
|
|
out <- archiveJob{new: newJob}.Copy()
|
|
continue
|
|
} else if dir1 == dir2 {
|
|
if file1 < file2 {
|
|
debug.Log("ArchivePipe.compare", " %q < %q, file %q removed", file1, file2, file1)
|
|
// file has been removed, load new old
|
|
loadOld = true
|
|
continue
|
|
} else {
|
|
debug.Log("ArchivePipe.compare", " %q > %q, file %q added", file1, file2, file2)
|
|
// file is new, send new job and load new
|
|
loadNew = true
|
|
out <- archiveJob{new: newJob}.Copy()
|
|
continue
|
|
}
|
|
}
|
|
|
|
debug.Log("ArchivePipe.compare", " %q > %q, file %q removed", file1, file2, file1)
|
|
// file has been removed, throw away old job and load new
|
|
loadOld = true
|
|
}
|
|
}
|
|
|
|
func (j archiveJob) Copy() pipe.Job {
|
|
if !j.hasOld {
|
|
return j.new
|
|
}
|
|
|
|
// handle files
|
|
if isRegularFile(j.new.Info()) {
|
|
debug.Log("archiveJob.Copy", " job %v is file", j.new.Path())
|
|
|
|
// if type has changed, return new job directly
|
|
if j.old.Node == nil {
|
|
return j.new
|
|
}
|
|
|
|
// if file is newer, return the new job
|
|
if j.old.Node.isNewer(j.new.Fullpath(), j.new.Info()) {
|
|
debug.Log("archiveJob.Copy", " job %v is newer", j.new.Path())
|
|
return j.new
|
|
}
|
|
|
|
debug.Log("archiveJob.Copy", " job %v add old data", j.new.Path())
|
|
// otherwise annotate job with old data
|
|
e := j.new.(pipe.Entry)
|
|
e.Node = j.old.Node
|
|
return e
|
|
}
|
|
|
|
// dirs and other types are just returned
|
|
return j.new
|
|
}
|
|
|
|
const saveIndexTime = 30 * time.Second
|
|
|
|
// saveIndexes regularly queries the master index for full indexes and saves them.
|
|
func (arch *Archiver) saveIndexes(wg *sync.WaitGroup, done <-chan struct{}) {
|
|
defer wg.Done()
|
|
|
|
ticker := time.NewTicker(saveIndexTime)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-done:
|
|
return
|
|
case <-ticker.C:
|
|
debug.Log("Archiver.saveIndexes", "saving full indexes")
|
|
err := arch.repo.SaveFullIndex()
|
|
if err != nil {
|
|
debug.Log("Archiver.saveIndexes", "save indexes returned an error: %v", err)
|
|
fmt.Fprintf(os.Stderr, "error saving preliminary index: %v\n", err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// unique returns a slice that only contains unique strings.
|
|
func unique(items []string) []string {
|
|
seen := make(map[string]struct{})
|
|
for _, item := range items {
|
|
seen[item] = struct{}{}
|
|
}
|
|
|
|
items = items[:0]
|
|
for item := range seen {
|
|
items = append(items, item)
|
|
}
|
|
return items
|
|
}
|
|
|
|
// Snapshot creates a snapshot of the given paths. If parentID is set, this is
|
|
// used to compare the files to the ones archived at the time this snapshot was
|
|
// taken.
|
|
func (arch *Archiver) Snapshot(p *Progress, paths []string, parentID *backend.ID) (*Snapshot, backend.ID, error) {
|
|
paths = unique(paths)
|
|
sort.Strings(paths)
|
|
|
|
debug.Log("Archiver.Snapshot", "start for %v", paths)
|
|
|
|
debug.RunHook("Archiver.Snapshot", nil)
|
|
|
|
// signal the whole pipeline to stop
|
|
done := make(chan struct{})
|
|
var err error
|
|
|
|
p.Start()
|
|
defer p.Done()
|
|
|
|
// create new snapshot
|
|
sn, err := NewSnapshot(paths)
|
|
if err != nil {
|
|
return nil, backend.ID{}, err
|
|
}
|
|
sn.Excludes = arch.Excludes
|
|
|
|
jobs := archivePipe{}
|
|
|
|
// use parent snapshot (if some was given)
|
|
if parentID != nil {
|
|
sn.Parent = parentID
|
|
|
|
// load parent snapshot
|
|
parent, err := LoadSnapshot(arch.repo, *parentID)
|
|
if err != nil {
|
|
return nil, backend.ID{}, err
|
|
}
|
|
|
|
// start walker on old tree
|
|
ch := make(chan WalkTreeJob)
|
|
go WalkTree(arch.repo, *parent.Tree, done, ch)
|
|
jobs.Old = ch
|
|
} else {
|
|
// use closed channel
|
|
ch := make(chan WalkTreeJob)
|
|
close(ch)
|
|
jobs.Old = ch
|
|
}
|
|
|
|
// start walker
|
|
pipeCh := make(chan pipe.Job)
|
|
resCh := make(chan pipe.Result, 1)
|
|
go func() {
|
|
pipe.Walk(paths, arch.SelectFilter, done, pipeCh, resCh)
|
|
debug.Log("Archiver.Snapshot", "pipe.Walk done")
|
|
}()
|
|
jobs.New = pipeCh
|
|
|
|
ch := make(chan pipe.Job)
|
|
go jobs.compare(done, ch)
|
|
|
|
var wg sync.WaitGroup
|
|
entCh := make(chan pipe.Entry)
|
|
dirCh := make(chan pipe.Dir)
|
|
|
|
// split
|
|
wg.Add(1)
|
|
go func() {
|
|
pipe.Split(ch, dirCh, entCh)
|
|
debug.Log("Archiver.Snapshot", "split done")
|
|
close(dirCh)
|
|
close(entCh)
|
|
wg.Done()
|
|
}()
|
|
|
|
// run workers
|
|
for i := 0; i < maxConcurrency; i++ {
|
|
wg.Add(2)
|
|
go arch.fileWorker(&wg, p, done, entCh)
|
|
go arch.dirWorker(&wg, p, done, dirCh)
|
|
}
|
|
|
|
// run index saver
|
|
var wgIndexSaver sync.WaitGroup
|
|
stopIndexSaver := make(chan struct{})
|
|
wgIndexSaver.Add(1)
|
|
go arch.saveIndexes(&wgIndexSaver, stopIndexSaver)
|
|
|
|
// wait for all workers to terminate
|
|
debug.Log("Archiver.Snapshot", "wait for workers")
|
|
wg.Wait()
|
|
|
|
// stop index saver
|
|
close(stopIndexSaver)
|
|
wgIndexSaver.Wait()
|
|
|
|
debug.Log("Archiver.Snapshot", "workers terminated")
|
|
|
|
// receive the top-level tree
|
|
root := (<-resCh).(*Node)
|
|
debug.Log("Archiver.Snapshot", "root node received: %v", root.Subtree.Str())
|
|
sn.Tree = root.Subtree
|
|
|
|
// save snapshot
|
|
id, err := arch.repo.SaveJSONUnpacked(backend.Snapshot, sn)
|
|
if err != nil {
|
|
return nil, backend.ID{}, err
|
|
}
|
|
|
|
// store ID in snapshot struct
|
|
sn.id = &id
|
|
debug.Log("Archiver.Snapshot", "saved snapshot %v", id.Str())
|
|
|
|
// flush repository
|
|
err = arch.repo.Flush()
|
|
if err != nil {
|
|
return nil, backend.ID{}, err
|
|
}
|
|
|
|
// save index
|
|
err = arch.repo.SaveIndex()
|
|
if err != nil {
|
|
debug.Log("Archiver.Snapshot", "error saving index: %v", err)
|
|
return nil, backend.ID{}, err
|
|
}
|
|
|
|
debug.Log("Archiver.Snapshot", "saved indexes")
|
|
|
|
return sn, id, nil
|
|
}
|
|
|
|
func isRegularFile(fi os.FileInfo) bool {
|
|
if fi == nil {
|
|
return false
|
|
}
|
|
|
|
return fi.Mode()&(os.ModeType|os.ModeCharDevice) == 0
|
|
}
|
|
|
|
// Scan traverses the dirs to collect Stat information while emitting progress
|
|
// information with p.
|
|
func Scan(dirs []string, filter pipe.SelectFunc, p *Progress) (Stat, error) {
|
|
p.Start()
|
|
defer p.Done()
|
|
|
|
var stat Stat
|
|
|
|
for _, dir := range dirs {
|
|
debug.Log("Scan", "Start for %v", dir)
|
|
err := filepath.Walk(dir, func(str string, fi os.FileInfo, err error) error {
|
|
// TODO: integrate error reporting
|
|
if err != nil {
|
|
fmt.Fprintf(os.Stderr, "error for %v: %v\n", str, err)
|
|
return nil
|
|
}
|
|
if fi == nil {
|
|
fmt.Fprintf(os.Stderr, "error for %v: FileInfo is nil\n", str)
|
|
return nil
|
|
}
|
|
|
|
if !filter(str, fi) {
|
|
debug.Log("Scan.Walk", "path %v excluded", str)
|
|
if fi.IsDir() {
|
|
return filepath.SkipDir
|
|
}
|
|
return nil
|
|
}
|
|
|
|
s := Stat{}
|
|
if fi.IsDir() {
|
|
s.Dirs++
|
|
} else {
|
|
s.Files++
|
|
|
|
if isRegularFile(fi) {
|
|
s.Bytes += uint64(fi.Size())
|
|
}
|
|
}
|
|
|
|
p.Report(s)
|
|
stat.Add(s)
|
|
|
|
// TODO: handle error?
|
|
return nil
|
|
})
|
|
|
|
debug.Log("Scan", "Done for %v, err: %v", dir, err)
|
|
if err != nil {
|
|
return Stat{}, err
|
|
}
|
|
}
|
|
|
|
return stat, nil
|
|
}
|