directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

1 files changed, 213 insertions, 0 deletions

diff --git a/weed/command/export.go b/weed/command/export.go
new file mode 100644
index 000000000..481aa111b
--- /dev/null
+++ b/weed/command/export.go
@@ -0,0 +1,213 @@
+package command
+
+import (
+	"archive/tar"
+	"bytes"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+)
+
+const (
+	defaultFnFormat = `{{.Mime}}/{{.Id}}:{{.Name}}`
+	timeFormat      = "2006-01-02T15:04:05"
+)
+
+var (
+	export ExportOptions
+)
+
+type ExportOptions struct {
+	dir        *string
+	collection *string
+	volumeId   *int
+}
+
+var cmdExport = &Command{
+	UsageLine: "export -dir=/tmp -volumeId=234 -o=/dir/name.tar -fileNameFormat={{.Name}} -newer='" + timeFormat + "'",
+	Short:     "list or export files from one volume data file",
+	Long: `List all files in a volume, or Export all files in a volume to a tar file if the output is specified.
+
+	The format of file name in the tar file can be customized. Default is {{.Mime}}/{{.Id}}:{{.Name}}. Also available is {{.Key}}.
+
+  `,
+}
+
+func init() {
+	cmdExport.Run = runExport // break init cycle
+	export.dir = cmdExport.Flag.String("dir", ".", "input data directory to store volume data files")
+	export.collection = cmdExport.Flag.String("collection", "", "the volume collection name")
+	export.volumeId = cmdExport.Flag.Int("volumeId", -1, "a volume id. The volume .dat and .idx files should already exist in the dir.")
+}
+
+var (
+	output = cmdExport.Flag.String("o", "", "output tar file name, must ends with .tar, or just a \"-\" for stdout")
+	format = cmdExport.Flag.String("fileNameFormat", defaultFnFormat, "filename formatted with {{.Mime}} {{.Id}} {{.Name}} {{.Ext}}")
+	newer  = cmdExport.Flag.String("newer", "", "export only files newer than this time, default is all files. Must be specified in RFC3339 without timezone")
+
+	tarOutputFile          *tar.Writer
+	tarHeader              tar.Header
+	fileNameTemplate       *template.Template
+	fileNameTemplateBuffer = bytes.NewBuffer(nil)
+	newerThan              time.Time
+	newerThanUnix          int64 = -1
+	localLocation, _             = time.LoadLocation("Local")
+)
+
+func runExport(cmd *Command, args []string) bool {
+
+	var err error
+
+	if *newer != "" {
+		if newerThan, err = time.ParseInLocation(timeFormat, *newer, localLocation); err != nil {
+			fmt.Println("cannot parse 'newer' argument: " + err.Error())
+			return false
+		}
+		newerThanUnix = newerThan.Unix()
+	}
+
+	if *export.volumeId == -1 {
+		return false
+	}
+
+	if *output != "" {
+		if *output != "-" && !strings.HasSuffix(*output, ".tar") {
+			fmt.Println("the output file", *output, "should be '-' or end with .tar")
+			return false
+		}
+
+		if fileNameTemplate, err = template.New("name").Parse(*format); err != nil {
+			fmt.Println("cannot parse format " + *format + ": " + err.Error())
+			return false
+		}
+
+		var outputFile *os.File
+		if *output == "-" {
+			outputFile = os.Stdout
+		} else {
+			if outputFile, err = os.Create(*output); err != nil {
+				glog.Fatalf("cannot open output tar %s: %s", *output, err)
+			}
+		}
+		defer outputFile.Close()
+		tarOutputFile = tar.NewWriter(outputFile)
+		defer tarOutputFile.Close()
+		t := time.Now()
+		tarHeader = tar.Header{Mode: 0644,
+			ModTime: t, Uid: os.Getuid(), Gid: os.Getgid(),
+			Typeflag:   tar.TypeReg,
+			AccessTime: t, ChangeTime: t}
+	}
+
+	fileName := strconv.Itoa(*export.volumeId)
+	if *export.collection != "" {
+		fileName = *export.collection + "_" + fileName
+	}
+	vid := storage.VolumeId(*export.volumeId)
+	indexFile, err := os.OpenFile(path.Join(*export.dir, fileName+".idx"), os.O_RDONLY, 0644)
+	if err != nil {
+		glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
+	}
+	defer indexFile.Close()
+
+	needleMap, err := storage.LoadNeedleMap(indexFile)
+	if err != nil {
+		glog.Fatalf("cannot load needle map from %s: %s", indexFile.Name(), err)
+	}
+
+	var version storage.Version
+
+	err = storage.ScanVolumeFile(*export.dir, *export.collection, vid,
+		storage.NeedleMapInMemory,
+		func(superBlock storage.SuperBlock) error {
+			version = superBlock.Version()
+			return nil
+		}, true, func(n *storage.Needle, offset int64) error {
+			nv, ok := needleMap.Get(n.Id)
+			glog.V(3).Infof("key %d offset %d size %d disk_size %d gzip %v ok %v nv %+v",
+				n.Id, offset, n.Size, n.DiskSize(), n.IsGzipped(), ok, nv)
+			if ok && nv.Size > 0 && int64(nv.Offset)*8 == offset {
+				if newerThanUnix >= 0 && n.HasLastModifiedDate() && n.LastModified < uint64(newerThanUnix) {
+					glog.V(3).Infof("Skipping this file, as it's old enough: LastModified %d vs %d",
+						n.LastModified, newerThanUnix)
+					return nil
+				}
+				return walker(vid, n, version)
+			}
+			if !ok {
+				glog.V(2).Infof("This seems deleted %d size %d", n.Id, n.Size)
+			} else {
+				glog.V(2).Infof("Skipping later-updated Id %d size %d", n.Id, n.Size)
+			}
+			return nil
+		})
+	if err != nil {
+		glog.Fatalf("Export Volume File [ERROR] %s\n", err)
+	}
+	return true
+}
+
+type nameParams struct {
+	Name string
+	Id   uint64
+	Mime string
+	Key  string
+	Ext  string
+}
+
+func walker(vid storage.VolumeId, n *storage.Needle, version storage.Version) (err error) {
+	key := storage.NewFileIdFromNeedle(vid, n).String()
+	if tarOutputFile != nil {
+		fileNameTemplateBuffer.Reset()
+		if err = fileNameTemplate.Execute(fileNameTemplateBuffer,
+			nameParams{
+				Name: string(n.Name),
+				Id:   n.Id,
+				Mime: string(n.Mime),
+				Key:  key,
+				Ext:  filepath.Ext(string(n.Name)),
+			},
+		); err != nil {
+			return err
+		}
+
+		fileName := fileNameTemplateBuffer.String()
+
+		if n.IsGzipped() && path.Ext(fileName) != ".gz" {
+			fileName = fileName + ".gz"
+		}
+
+		tarHeader.Name, tarHeader.Size = fileName, int64(len(n.Data))
+		if n.HasLastModifiedDate() {
+			tarHeader.ModTime = time.Unix(int64(n.LastModified), 0)
+		} else {
+			tarHeader.ModTime = time.Unix(0, 0)
+		}
+		tarHeader.ChangeTime = tarHeader.ModTime
+		if err = tarOutputFile.WriteHeader(&tarHeader); err != nil {
+			return err
+		}
+		_, err = tarOutputFile.Write(n.Data)
+	} else {
+		size := n.DataSize
+		if version == storage.Version1 {
+			size = n.Size
+		}
+		fmt.Printf("key=%s Name=%s Size=%d gzip=%t mime=%s\n",
+			key,
+			n.Name,
+			size,
+			n.IsGzipped(),
+			n.Mime,
+		)
+	}
+	return
+}