Add commands 'cat','list' and 'ls'

cmd/khepri/cmd_cat.go

@@ -0,0 +1,133 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/fd0/khepri"
+	"github.com/fd0/khepri/backend"
+)
+
+func commandCat(be backend.Server, key *khepri.Key, args []string) error {
+	if len(args) != 2 {
+		return errors.New("usage: cat [blob|tree|snapshot|key|lock] ID")
+	}
+
+	tpe := args[0]
+
+	id, err := backend.ParseID(args[1])
+	if err != nil {
+		return err
+	}
+
+	ch, err := khepri.NewContentHandler(be, key)
+	if err != nil {
+		return err
+	}
+
+	err = ch.LoadAllSnapshots()
+	if err != nil {
+		return err
+	}
+
+	switch tpe {
+	case "blob":
+		// try id
+		data, err := ch.Load(backend.Blob, id)
+		if err == nil {
+			_, err = os.Stdout.Write(data)
+			return err
+		}
+
+		// try storage id
+		buf, err := be.Get(backend.Blob, id)
+		if err != nil {
+			return err
+		}
+
+		// decrypt
+		buf, err = key.Decrypt(buf)
+		if err != nil {
+			return err
+		}
+
+		_, err = os.Stdout.Write(data)
+		return err
+
+	case "tree":
+		var tree khepri.Tree
+		// try id
+		err := ch.LoadJSON(backend.Tree, id, &tree)
+		if err != nil {
+			// try storage id
+			buf, err := be.Get(backend.Tree, id)
+			if err != nil {
+				return err
+			}
+
+			// decrypt
+			buf, err = key.Decrypt(buf)
+			if err != nil {
+				return err
+			}
+
+			// unmarshal
+			err = json.Unmarshal(backend.Uncompress(buf), &tree)
+			if err != nil {
+				return err
+			}
+		}
+
+		buf, err := json.MarshalIndent(&tree, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "snapshot":
+		var sn khepri.Snapshot
+		err := ch.LoadJSONRaw(backend.Snapshot, id, &sn)
+		if err != nil {
+			return err
+		}
+
+		buf, err := json.MarshalIndent(&sn, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "key":
+		data, err := be.Get(backend.Key, id)
+		if err != nil {
+			return err
+		}
+
+		var key khepri.Key
+		err = json.Unmarshal(data, &key)
+		if err != nil {
+			return err
+		}
+
+		buf, err := json.MarshalIndent(&key, "", "  ")
+		if err != nil {
+			return err
+		}
+
+		fmt.Println(string(buf))
+
+		return nil
+	case "lock":
+		return errors.New("not yet implemented")
+	default:
+		return errors.New("invalid type")
+	}
+
+	return nil
+}

cmd/khepri/cmd_list.go

@@ -1,21 +1,44 @@
 package main
 
 import (
+	"errors"
+	"fmt"
+
 	"github.com/fd0/khepri"
 	"github.com/fd0/khepri/backend"
 )
 
 func commandList(be backend.Server, key *khepri.Key, args []string) error {
+	if len(args) != 1 {
+		return errors.New("usage: list [blobs|trees|snapshots|keys|locks]")
+	}
 
-	// ids, err := be.ListRefs()
-	// if err != nil {
-	// 	fmt.Fprintf(os.Stderr, "error: %v\n", err)
-	// 	return nil
-	// }
+	var (
+		t    backend.Type
+		each func(backend.Server, backend.Type, func(backend.ID, []byte, error)) error = backend.Each
+	)
+	switch args[0] {
+	case "blobs":
+		t = backend.Blob
+		each = key.Each
+	case "trees":
+		t = backend.Tree
+		each = key.Each
+	case "snapshots":
+		t = backend.Snapshot
+	case "keys":
+		t = backend.Key
+	case "locks":
+		t = backend.Lock
+	default:
+		return errors.New("invalid type")
+	}
 
-	// for _, id := range ids {
-	// 	fmt.Printf("%v\n", id)
-	// }
-
-	return nil
+	return each(be, t, func(id backend.ID, data []byte, err error) {
+		if t == backend.Blob || t == backend.Tree {
+			fmt.Printf("%s %s\n", id, backend.Hash(data))
+		} else {
+			fmt.Printf("%s\n", id)
+		}
+	})
 }

cmd/khepri/cmd_ls.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/fd0/khepri"
+	"github.com/fd0/khepri/backend"
+)
+
+func print_node(prefix string, n *khepri.Node) string {
+	switch n.Type {
+	case "file":
+		return fmt.Sprintf("%s %5d %5d %6d %s %s",
+			n.Mode, n.UID, n.GID, n.Size, n.ModTime, filepath.Join(prefix, n.Name))
+	case "dir":
+		return fmt.Sprintf("%s %5d %5d %6d %s %s",
+			n.Mode|os.ModeDir, n.UID, n.GID, n.Size, n.ModTime, filepath.Join(prefix, n.Name))
+	case "symlink":
+		return fmt.Sprintf("%s %5d %5d %6d %s %s -> %s",
+			n.Mode|os.ModeSymlink, n.UID, n.GID, n.Size, n.ModTime, filepath.Join(prefix, n.Name), n.LinkTarget)
+	default:
+		return fmt.Sprintf("<Node(%s) %s>", n.Type, n.Name)
+	}
+}
+
+func print_tree(prefix string, ch *khepri.ContentHandler, id backend.ID) error {
+	tree := &khepri.Tree{}
+
+	err := ch.LoadJSON(backend.Tree, id, tree)
+	if err != nil {
+		return err
+	}
+
+	for _, entry := range *tree {
+		fmt.Println(print_node(prefix, entry))
+
+		if entry.Type == "dir" && entry.Subtree != nil {
+			err = print_tree(filepath.Join(prefix, entry.Name), ch, entry.Subtree)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func commandLs(be backend.Server, key *khepri.Key, args []string) error {
+	if len(args) < 1 || len(args) > 2 {
+		return errors.New("usage: ls SNAPSHOT_ID [dir]")
+	}
+
+	id, err := backend.ParseID(args[0])
+	if err != nil {
+		return err
+	}
+
+	ch, err := khepri.NewContentHandler(be, key)
+	if err != nil {
+		return err
+	}
+
+	sn, err := ch.LoadSnapshot(id)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("snapshot of %s at %s:\n", sn.Dir, sn.Time)
+
+	return print_tree("", ch, sn.Content)
+}

cmd/khepri/main.go

@@ -124,6 +124,8 @@ func init() {
 	commands["restore"] = commandRestore
 	commands["list"] = commandList
 	commands["snapshots"] = commandSnapshots
+	commands["cat"] = commandCat
+	commands["ls"] = commandLs
 }
 
 func main() {

contenthandler.go

@@ -29,7 +29,7 @@ func NewContentHandler(be backend.Server, key *Key) (*ContentHandler, error) {
 	return ch, nil
 }
 
-// LoadSnapshotadds all blobs from a snapshot into the content handler and returns the snapshot.
+// LoadSnapshot adds all blobs from a snapshot into the content handler and returns the snapshot.
 func (ch *ContentHandler) LoadSnapshot(id backend.ID) (*Snapshot, error) {
 	sn, err := LoadSnapshot(ch, id)
 	if err != nil {