migrate fix command

git-svn-id: https://weed-fs.googlecode.com/svn/trunk@63 282b0af5-e82d-9cf1-ede4-77906d7719d0

weed-fs/src/cmd/weed/command.go

@@ -10,7 +10,7 @@ import (
 type Command struct {
   // Run runs the command.
   // The args are the arguments after the command name.
-  Run func(cmd *Command, args []string)
+  Run func(cmd *Command, args []string) bool
 
   // UsageLine is the one-line usage message.
   // The first word in the line is taken to be the command name.
@@ -25,9 +25,6 @@ type Command struct {
   // Flag is a set of flags specific to this command.
   Flag flag.FlagSet
 
-  // CustomFlags indicates that the command will do its own
-  // flag parsing.
-  CustomFlags bool
 }
 
 // Name returns the command's name: the first word in the usage line.
@@ -41,7 +38,7 @@ func (c *Command) Name() string {
 }
 
 func (c *Command) Usage() {
-  fmt.Fprintf(os.Stderr, "usage: %s\n\n", c.UsageLine)
+  fmt.Fprintf(os.Stderr, "Usage: %s\n", c.UsageLine)
   fmt.Fprintf(os.Stderr, "  %s\n", strings.TrimSpace(c.Long))
   os.Exit(2)
 }

weed-fs/src/cmd/weed/fix.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+  "pkg/storage"
+  "log"
+  "os"
+  "path"
+  "strconv"
+)
+
+func init() {
+  cmdFix.Run = runFix // break init cycle
+}
+
+var cmdFix = &Command{
+  UsageLine: "fix -dir=/tmp -volumeId=234 -debug=1",
+  Short:     "run weed tool fix on data file if corrupted",
+  Long: `Fix runs the WeedFS fix command on the .dat volume file.
+
+  `,
+}
+
+var (
+  dir      = cmdFix.Flag.String("dir", "/tmp", "data directory to store files")
+  volumeId = cmdFix.Flag.Int("volumeId", -1, "a non-negative volume id. The volume should already exist in the dir. The volume index file should not exist.")
+  IsDebug  = cmdFix.Flag.Bool("debug", false, "enable debug mode")
+
+  store *storage.Store
+)
+
+func runFix(cmd *Command, args []string) bool {
+
+  if *volumeId == -1 {
+    return false
+  }
+
+  fileName := strconv.Itoa(*volumeId)
+  dataFile, e := os.OpenFile(path.Join(*dir, fileName+".dat"), os.O_RDONLY, 0644)
+  if e != nil {
+    log.Fatalf("Read Volume [ERROR] %s\n", e)
+  }
+  defer dataFile.Close()
+  indexFile, ie := os.OpenFile(path.Join(*dir, fileName+".idx"), os.O_WRONLY|os.O_CREATE, 0644)
+  if ie != nil {
+    log.Fatalf("Create Volume Index [ERROR] %s\n", ie)
+  }
+  defer indexFile.Close()
+
+  //skip the volume super block
+  dataFile.Seek(storage.SuperBlockSize, 0)
+
+  n, length := storage.ReadNeedle(dataFile)
+  nm := storage.NewNeedleMap(indexFile)
+  offset := uint32(storage.SuperBlockSize)
+  for n != nil {
+    if *IsDebug {
+      log.Println("key", n.Key, "volume offset", offset, "data_size", n.Size, "length", length)
+    }
+    if n.Size > 0 {
+      count, pe := nm.Put(n.Key, offset/8, n.Size)
+      if *IsDebug {
+        log.Println("saved", count, "with error", pe)
+      }
+    }
+    offset += length
+    n, length = storage.ReadNeedle(dataFile)
+  }
+  return true
+}

weed-fs/src/cmd/weed/version.go

@@ -1,7 +1,3 @@
-// Copyright 2011 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
 package main
 
 import (
@@ -16,10 +12,11 @@ var cmdVersion = &Command{
 	Long:      `Version prints the Weed File System version`,
 }
 
-func runVersion(cmd *Command, args []string) {
+func runVersion(cmd *Command, args []string) bool{
 	if len(args) != 0 {
 		cmd.Usage()
 	}
 
 	fmt.Printf("version 0.15 %s %s\n",runtime.GOOS, runtime.GOARCH)
+	return true
 }

weed-fs/src/cmd/weed/weed.go

@@ -14,6 +14,7 @@ import (
 )
 
 var commands = []*Command{
+	cmdFix,
 	cmdVersion,
 }
 
@@ -46,13 +47,14 @@ func main() {
 	for _, cmd := range commands {
 		if cmd.Name() == args[0] && cmd.Run != nil {
 			cmd.Flag.Usage = func() { cmd.Usage() }
-			if cmd.CustomFlags {
-				args = args[1:]
-			} else {
 			cmd.Flag.Parse(args[1:])
 			args = cmd.Flag.Args()
+			if !cmd.Run(cmd, args) {
+				fmt.Fprintf(os.Stderr, "Default Parameters:\n")
+				cmd.Flag.PrintDefaults()
+        fmt.Fprintf(os.Stderr, "\n")
+				cmd.Flag.Usage()
 			}
-			cmd.Run(cmd, args)
 			exit()
 			return
 		}
@@ -63,7 +65,7 @@ func main() {
 	exit()
 }
 
-var usageTemplate = `Go is a tool for managing Go source code.
+var usageTemplate = `WeedFS is a software to store billions of files and serve them fast!
 
 Usage:
 
@@ -83,9 +85,9 @@ Use "weed help [topic]" for more information about that topic.
 
 `
 
-var helpTemplate = `{{if .Runnable}}usage: weed {{.UsageLine}}
-
-{{end}}{{.Long | trim}}
+var helpTemplate = `{{if .Runnable}}Usage: weed {{.UsageLine}}
+{{end}}
+  {{.Long}}
 `
 
 // tmpl executes the given template text on data, writing the result to w.
@@ -154,16 +156,6 @@ func exit() {
 	os.Exit(exitStatus)
 }
 
-func fatalf(format string, args ...interface{}) {
-	errorf(format, args...)
-	exit()
-}
-
-func errorf(format string, args ...interface{}) {
-	log.Printf(format, args...)
-	setExitStatus(1)
-}
-
 var logf = log.Printf
 
 func exitIfErrors() {
@@ -171,20 +163,3 @@ func exitIfErrors() {
 		exit()
 	}
 }
-
-// stringList's arguments should be a sequence of string or []string values.
-// stringList flattens them into a single []string.
-func stringList(args ...interface{}) []string {
-	var x []string
-	for _, arg := range args {
-		switch arg := arg.(type) {
-		case []string:
-			x = append(x, arg...)
-		case string:
-			x = append(x, arg)
-		default:
-			panic("stringList: invalid argument")
-		}
-	}
-	return x
-}