drive: Fix multiple files of same name being created

ModifiedDate seems to be set on Insert if set, so do that

drive/drive.go

@@ -663,45 +663,47 @@ func (f *FsDrive) Put(in io.Reader, remote string, modTime time.Time, size int64
 		return nil, fmt.Errorf("Couldn't find or make directory: %s", err)
 	}
 
+	// See if the file already exists
+	var info *drive.File
+	found, err := f.listAll(directoryId, leaf, false, true, func(item *drive.File) bool {
+		info = item
+		return true
+	})
+	if err != nil {
+		return nil, fmt.Errorf("Error finding file: %s", leaf, err)
+	}
+
 	// Guess the mime type
 	mimeType := mime.TypeByExtension(path.Ext(remote))
 	if mimeType == "" {
 		mimeType = "application/octet-stream"
 	}
+	modifiedDate := modTime.Format(time.RFC3339Nano)
 
+	if found {
+		// Modify metadata
+		info.ModifiedDate = modifiedDate
+		info.MimeType = mimeType
+
+		// Make the API request to upload metadata and file data.
+		info, err = f.svc.Files.Update(info.Id, info).SetModifiedDate(true).Media(in).Do()
+	} else {
 		// Define the metadata for the file we are going to create.
-	info := &drive.File{
+		info = &drive.File{
 			Title:        leaf,
 			Description:  leaf,
 			Parents:      []*drive.ParentReference{{Id: directoryId}},
 			MimeType:     mimeType,
+			ModifiedDate: modifiedDate,
 		}
 
-	// FIXME can't set modified date on initial upload as no
+		// Make the API request to upload metadata and file data.
-	// .SetModifiedDate().  This agrees with the API docs, but not
-	// with the comment on
-	// https://developers.google.com/drive/v2/reference/files/insert
-	//
-	// modifiedDate datetime Last time this file was modified by
-	// anyone (formatted RFC 3339 timestamp). This is only mutable
-	// on update when the setModifiedDate parameter is set.
-	// writable
-	//
-	// There is no setModifiedDate parameter though
-
-	// Make the API request to upload infodata and file data.
 		info, err = f.svc.Files.Insert(info).Media(in).Do()
+	}
 	if err != nil {
 		return nil, fmt.Errorf("Upload failed: %s", err)
 	}
 	fs.setMetaData(info)
-
-	// Set modified date
-	info.ModifiedDate = modTime.Format(time.RFC3339Nano)
-	_, err = f.svc.Files.Update(info.Id, info).SetModifiedDate(true).Do()
-	if err != nil {
-		return fs, fmt.Errorf("Failed to set mtime: %s", err)
-	}
 	return fs, nil
 }
 

notes.txt

@@ -31,6 +31,7 @@ Ideas
       * Google cloud storage: https://developers.google.com/storage/
       * rsync over ssh
       * dropbox: https://github.com/nickoneill/go-dropbox (no MD5s)
+  * control times sync (which is slow) with -a --archive flag?
 
 Need to make directory objects otherwise can't upload an empty directory
   * Or could upload empty directories only?
@@ -42,6 +43,10 @@ s3
     * Otherwise can set metadata
   * Returns etag and last modified in bucket list
 
-Bugs
+Drive
+  * Should keep a note of files we list then call a new method
+    Object.Update() which would be more efficient than haveing to look
+    the id up for each file
  
-Non verbose - not sure number transferred got counted up? CHECK
+Bugs
+  * Non verbose - not sure number transferred got counted up? CHECK