Add gsutil sync script and the usage to readme

Author: tilfin

README.md

@@ -32,18 +32,32 @@ $ sudo -i
 # cp backup.conf.sample backup.conf
 ```
 
-### Quick Settings
+### Quick Settings for Google Cloud Storage
 
-#### backup.conf
+#### Install gsutil
 
-* Buckets
+```
+# cd /backup
+# wget https://storage.googleapis.com/pub/gsutil.tar.gz
+# tar zxf gsutil.tar.gz
+```
+
+#### Setup gsutil authentication
 
-#### Sync
+```
+# /backup/gsutil/gsutil config -o /backup/serverbackup/boto.cfg
+```
+
+#### backup.conf
+
+Edit following entries.
 
-Edit sync script.
+* Buckets
+* Sync
 
 ```
-gsutil $1 gs://$2/$3
+Buckets=backup-bucket
+Sync=/backup/serverbackup/sync.gsutil
 ```
 
 #### Backup commands

sync.gsutil

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+BOTO_PATH=/backup/serverbackup/boto.cfg
+
+if [ "$DRY_RUN" ]; then
+  /backup/gsutil/gsutil rsync -r $1 gs://$2/$3
+else
+  /backup/gsutil/gsutil rsync -n -r $1 gs://$2/$3
+fi
+exit $?