/
dp.go
142 lines (125 loc) · 2.62 KB
/
dp.go
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package main
import (
"archive/tar"
"bufio"
"errors"
"fmt"
"io"
"log"
"os"
"camlistore.org/pkg/blob"
"camlistore.org/pkg/blobserver"
"camlistore.org/pkg/blobserver/dir"
"github.com/gonuts/commander"
"github.com/dichro/cameloff/fsck"
)
type Flag struct {
Path string
BS blobserver.Storage
}
func (f *Flag) Set(path string) error {
f.Path = path
s, err := dir.New(path)
_, ok := s.(blobserver.BlobStreamer)
switch {
case err != nil:
return err
case !ok:
return errors.New("not a diskpacked repository")
default:
f.BS = s
}
return nil
}
func (f *Flag) String() string {
return f.Path
}
func (f *Flag) Get() interface{} {
return f.Path
}
func main() {
bs := Flag{}
cat := &commander.Command{
UsageLine: "cat prints blob contents",
Run: func(cmd *commander.Command, args []string) error {
if bs.BS == nil {
return errors.New("require --blob_dir")
}
for _, ref := range args {
br, ok := blob.Parse(ref)
if !ok {
fmt.Fprintf(os.Stderr, "couldn't parse ref\n")
continue
}
blob, _, err := bs.BS.Fetch(br)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", ref, err)
continue
}
io.Copy(os.Stdout, blob)
blob.Close()
}
return nil
},
}
tar := &commander.Command{
UsageLine: "tar exports files from the blobstore",
Run: func(cmd *commander.Command, args []string) error {
if bs.BS == nil {
return errors.New("require --blob_dir")
}
files := fsck.NewFiles(bs.BS)
go files.LogErrors()
// read blobrefs from stdin
refsCh := make(chan string, 20)
go func() {
in := bufio.NewScanner(os.Stdin)
for in.Scan() {
// TODO(dichro): validate ref?
refsCh <- in.Text()
}
close(refsCh)
}()
go func() {
files.ReadRefs(refsCh)
files.Close()
}()
out := tar.NewWriter(os.Stdout)
defer out.Flush()
for r := range files.Readers {
size := r.PartsSize()
if err := out.WriteHeader(&tar.Header{
Name: r.FileName(),
Mode: int64(r.FileMode()),
Uid: r.MapUid(),
Gid: r.MapGid(),
Size: size,
ModTime: r.ModTime(),
Typeflag: tar.TypeReg,
}); err != nil {
log.Fatal(err)
}
switch n, err := io.Copy(out, r); {
case err != nil:
log.Fatal(err)
case n != size:
log.Fatalf("wrote %d of %d", n, size)
}
}
return nil
},
}
top := &commander.Command{
UsageLine: os.Args[0],
Subcommands: []*commander.Command{
cat,
tar,
},
}
for _, cmd := range top.Subcommands {
cmd.Flag.Var(&bs, "blob_dir", "Camlistore blob directory")
}
if err := top.Dispatch(os.Args[1:]); err != nil {
log.Fatal(err)
}
}