script to warm apts/pips on a base image, to speed up performace of build_ scripts

tools/warm_apts_and_pips.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+# Keep track of the current directory
+TOOLS_DIR=$(cd $(dirname "$0") && pwd)
+TOP_DIR=`cd $TOOLS_DIR/..; pwd`
+
+# cd to top of devstack
+cd $TOP_DIR
+
+# Echo usage
+usage() {
+    echo "Cache OpenStack dependencies on a uec image to speed up performance."
+    echo ""
+    echo "Usage: $0 [full path to raw uec base image]"
+}
+
+# Make sure this is a raw image
+if ! qemu-img info $1 | grep -q "file format: raw"; then
+    usage
+    exit 1
+fi
+
+# Mount the image
+STAGING_DIR=`mktemp -d uec.XXXXXXXXXX`
+mkdir -p $STAGING_DIR
+mount -t ext4 -o loop $1 $STAGING_DIR
+
+# Make sure that base requirements are installed
+cp /etc/resolv.conf $STAGING_DIR/etc/resolv.conf
+
+# Perform caching on the base image to speed up subsequent runs
+chroot $STAGING_DIR apt-get update
+chroot $STAGING_DIR apt-get install -y --download-only `cat files/apts/* | grep NOPRIME | cut -d\# -f1`
+chroot $STAGING_DIR apt-get install -y --force-yes `cat files/apts/* | grep -v NOPRIME | cut -d\# -f1`
+chroot $STAGING_DIR pip install `cat files/pips/*`
+umount $STAGING_DIR && rm -rf $STAGING_DIR