move setting variables and run-as-stack-user code

Change the over all flow so that the default settings are
filled in in the outside shell (not inside the '()' and 'tee').

This way, those variables pass through to the subshell, but they're
also available in the parent shell at the end for outputting status.

Also, exit failure rather than success if 'exec' to run as stack
user failed.

stack.sh

@@ -40,52 +40,6 @@ if [ ! -d $FILES ]; then
     exit 1
 fi
 
-# Settings
-# ========
-
-# This script is customizable through setting environment variables.  If you
-# want to override a setting you can either::
-#
-#     export MYSQL_PASS=anothersecret
-#     ./stack.sh
-#
-# You can also pass options on a single line ``MYSQL_PASS=simple ./stack.sh``
-#
-# Additionally, you can put any local variables into a ``localrc`` file, like::
-#
-#     MYSQL_PASS=anothersecret
-#     MYSQL_USER=hellaroot
-#
-# We try to have sensible defaults, so you should be able to run ``./stack.sh``
-# in most cases.
-#
-# We our settings from ``stackrc``.  This file is distributed with devstack and
-# contains locations for what repositories to use.  If you want to use other 
-# repositories and branches, you can add your own settings with another file 
-# called ``localrc``
-#
-# If ``localrc`` exists, then ``stackrc`` will load those settings.  This is 
-# useful for changing a branch or repostiory to test other versions.  Also you
-# can store your other settings like **MYSQL_PASS** or **ADMIN_PASSWORD** instead
-# of letting devstack generate random ones for you.
-source ./stackrc
-
-LOGFILE=${LOGFILE:-"$PWD/stack.sh.$$.log"}
-(
-# So that errors don't compound we exit on any errors so you see only the
-# first error that occured.
-trap failed ERR
-failed() {
-    local r=$?
-    set +o xtrace
-    [ -n "$LOGFILE" ] && echo "${0##*/} failed: full log in $LOGFILE"
-    exit $r
-}
-
-# Print the commands being run so that we can see the command that triggers
-# an error.  It is also useful for following along as the install occurs.
-set -o xtrace
-
 # OpenStack is designed to be run as a regular user (Dashboard will fail to run
 # as root, since apache refused to startup serve content from root user).  If
 # stack.sh is run as root, it automatically creates a stack user with
@@ -119,13 +73,42 @@ if [[ $EUID -eq 0 ]]; then
     else
         exec su -ec "cd $STACK_DIR; bash stack.sh" stack
     fi
-    exit 0
+    exit 1
 fi
 
+
+# Settings
+# ========
+
+# This script is customizable through setting environment variables.  If you
+# want to override a setting you can either::
+#
+#     export MYSQL_PASS=anothersecret
+#     ./stack.sh
+#
+# You can also pass options on a single line ``MYSQL_PASS=simple ./stack.sh``
+#
+# Additionally, you can put any local variables into a ``localrc`` file, like::
+#
+#     MYSQL_PASS=anothersecret
+#     MYSQL_USER=hellaroot
+#
+# We try to have sensible defaults, so you should be able to run ``./stack.sh``
+# in most cases.
+#
+# We our settings from ``stackrc``.  This file is distributed with devstack and
+# contains locations for what repositories to use.  If you want to use other 
+# repositories and branches, you can add your own settings with another file 
+# called ``localrc``
+#
+# If ``localrc`` exists, then ``stackrc`` will load those settings.  This is 
+# useful for changing a branch or repostiory to test other versions.  Also you
+# can store your other settings like **MYSQL_PASS** or **ADMIN_PASSWORD** instead
+# of letting devstack generate random ones for you.
+source ./stackrc
+
 # Destination path for installation ``DEST``
 DEST=${DEST:-/opt/stack}
-sudo mkdir -p $DEST
-sudo chown `whoami` $DEST
 
 # Set the destination directories for openstack projects
 NOVA_DIR=$DEST/nova
@@ -227,6 +210,24 @@ SERVICE_TOKEN=${SERVICE_TOKEN:-`openssl rand -hex 12`}
 # so use 10 bytes
 ADMIN_PASSWORD=${ADMIN_PASSWORD:-`openssl rand -hex 10`}
 
+LOGFILE=${LOGFILE:-"$PWD/stack.sh.$$.log"}
+(
+# So that errors don't compound we exit on any errors so you see only the
+# first error that occured.
+trap failed ERR
+failed() {
+    local r=$?
+    set +o xtrace
+    [ -n "$LOGFILE" ] && echo "${0##*/} failed: full log in $LOGFILE"
+    exit $r
+}
+
+# Print the commands being run so that we can see the command that triggers
+# an error.  It is also useful for following along as the install occurs.
+set -o xtrace
+
+sudo mkdir -p $DEST
+sudo chown `whoami` $DEST
 
 # Install Packages
 # ================