Adding support for checkout of particular tag/branch

Signed-off-by: Radek Dostal <rd@radekdostal.com>

oebb.sh

@@ -354,6 +354,16 @@ function layer_info()
 	echo
 }
 
+###############################################################################
+# checkout - Checkout all layers with a given tag
+###############################################################################
+function checkout()
+{
+set_environment
+env gawk -v command=checkout -v commandarg=$TAG -f ${OE_BASE}/scripts/layers.awk ${OE_SOURCE_DIR}/layers.txt 
+}
+
+
 ###############################################################################
 # Build the specified OE packages or images.
 ###############################################################################
@@ -397,6 +407,17 @@ then
         exit 0
     fi
 
+    if [ $1 = "checkout" ]
+    then
+        if [ -z $2 ] ; then
+            echo "Checkout needs an argument"
+            exit 1
+        else
+            TAG="$2"
+        fi
+        checkout
+        exit 0
+    fi
     if [ $1 = "bitbake" ]
     then
         shift
@@ -426,6 +447,7 @@ echo "Usage: $0 config <machine>"
 echo "       $0 update"
 echo "       $0 tag [tagname]"
 echo "       $0 changelog <tagname>"
+echo "       $0 checkout <tagname>"
 echo "       $0 clean"
 echo ""
 echo "       Not recommended, but also possible:"

scripts/layerman

@@ -90,13 +90,21 @@ function diff_tags() {
     echo ""
 }
 
+function checkout_tag() {
+    check_layer
+    cd ${LAYERDIR} && echo "Checking out $COMMANDARG" && git checkout $COMMANDARG
+    echo ""
+}
+
 case $COMMAND in
 tag)
     tag_layers;;
 changelog)
     diff_tags;;
 info)
 	get_info;;
+checkout)
+    checkout_tag;;	
 *)
     update_layers;;
 esac