Avoid overwritting of hooks

Until now there was a possibility for two elements to install hooks
with the same name, so one of them was overwritten. Change logic to
copy the hooks and fail in case one with the same name exists.

Change-Id: Ic2c46835b27c9319f7a889ffd0ccf3f5ccc1f0cd
Closes-Bug: 1251952

lib/common-functions

@@ -58,12 +58,30 @@ function save_image () {
     finish_image $1
 }
 
+function copy_hooks_not_overwrite () {
+    _DIR=$(basename $1)
+    test -d $TMP_HOOKS_PATH/$_DIR || mkdir $TMP_HOOKS_PATH/$_DIR
+    for _HOOK in $(ls $1); do
+      if [ ! -f $TMP_HOOKS_PATH/$_DIR/$_HOOK ]; then
+        cp -t $TMP_HOOKS_PATH/$_DIR -a $1/$_HOOK
+      else
+        echo "There is a duplicated hook in your elements: $_ELEMENT/$_DIR/$_HOOK"
+        exit 1
+      fi
+    done
+}
+
 function generate_hooks () {
   mkdir -p $TMP_HOOKS_PATH
   for _ELEMENT in $IMAGE_ELEMENT ; do
     for dir in ${ELEMENTS_PATH//:/ } ; do
       [ -d $dir/$_ELEMENT ] || continue
-      cp -t $TMP_HOOKS_PATH -a $dir/$_ELEMENT/* ;
+      for _DIR in $(find $dir/$_ELEMENT -mindepth 1 -maxdepth 1 -type d -not -name tests); do
+        copy_hooks_not_overwrite $_DIR
+      done
+      for _FILE in $(find $dir/$_ELEMENT -maxdepth 1 -type f); do
+        cp -t $TMP_HOOKS_PATH -a $_FILE
+      done
       break
     done
   done