Add in-place execution mode for reproducer

Adds command line option and environment variable that allows user to
run reproducer without wiping tq[e] repositories on each run.

When specified it will just pull and rebase them when they already
exist.

This allows us to test effects of changes made to these repositories
and re-run reproducer multiple times.

Change-Id: I7b489d5fba0e1f5dd0d34fff48107440cbc93c00

roles/create-reproducer-script/templates/reproducer-quickstart.sh.j2

@@ -19,6 +19,7 @@
 : ${NODES_FILE:="{{ nodes_config }}"}
 : ${ZUUL_CHANGES:="{{ zuul_changes }}"}
 : ${EXTRA_PARAMS:=""}
+: ${IN_PLACE:=false}
 
 SSH_OPTS="-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null"
 
@@ -29,6 +30,9 @@ usage () {
     echo "  -w, --workspace <dir>"
     echo "                      directory where the virtualenv, inventory files, etc."
     echo "                      are created. Defaults to creating a directory in /tmp"
+    echo "  -i, --in-place"
+    echo "                      Avoid wiping tq[e] repositories if they already exist"
+    echo "                      and just pull --rebase them. [IN_PLACE=true]"
     echo "  -v, --create-virtualenv"
     echo "                      create a virtualenv to install Ansible and dependencies."
     echo "                      Options to pass true/false. Defaults to true for OVB. "
@@ -82,6 +86,11 @@ while [ "x$1" != "x" ]; do
             shift
             ;;
 
+        --in-place|-i)
+            IN_PLACE=true
+            shift
+            ;;
+
         --create-virtualenv|-v)
             CREATE_VIRTUALENV=$2
             shift
@@ -209,11 +218,20 @@ export ZUUL_CHANGES
 # Start from a clean workspace
 mkdir -p $WORKSPACE
 cd $WORKSPACE
-rm -rf tripleo-quickstart tripleo-quickstart-extras
+[ "$IN_PLACE" == "true" ] || \
+    rm -rf tripleo-quickstart tripleo-quickstart-extras
 
 # Clone quickstart and quickstart-extras
-git clone https://github.com/openstack/tripleo-quickstart
-git clone https://github.com/openstack/tripleo-quickstart-extras
+for REPO in tripleo-quickstart tripleo-quickstart-extras
+do
+    if [ -d "$REPO" ]; then
+        pushd $REPO
+        git pull --rebase
+        popd
+    else
+        git clone https://github.com/openstack/$REPO
+    fi
+done
 
 # Set up a virtual env if requested
 if [ "$CREATE_VIRTUALENV" = "true" ]; then