diff --git a/read_config b/read_config
index 7cdc2b0..1eacaf8 100755
--- a/read_config
+++ b/read_config
@@ -22,6 +22,9 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
     readonly UPDATEPSABEGIN=./.updatepsa/begin
     readonly UPDATEPSAEND=./.updatepsa/end
 
+    readonly OPKG_CMDS_TMP=/tmp/opkg_commands
+    readonly GIT_PULL_TMP=/tmp/git_pull
+
     readonly PROGRAM=`basename $0`
     readonly WORKSPACE_DIR=workspace
 
@@ -97,13 +100,15 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
     compute_hash () {
         if cd_customer_repository; then
             local hash=""
-            if [[ -z $1 ]]; then
+            if [[ -z "$1" ]]; then
                 hash=$(git log -n 1 --pretty=format:%H)
             else
-                hash=$(git log -n 1 --pretty=format:%H -- $1)
+                hash=$(git hash-object "$1")
             fi
-            echo ${hash:0:10}   # return the first 10 hex characters
+            cd_home ; echo ${hash:0:10}   # return the first 10 hex characters
+            return 0
         fi
+        return 1
     }
 
     compute_version () {