Add buildpxe.sh framework

Adds a script to set up a PXE image directory for the PVC installer.
Provides an alternative to the ISO for automating deploys in a
controlled, PXE-based environment.

buildpxe.sh

@@ -0,0 +1,135 @@
+#!/usr/bin/env bash
+
+# Generate a PVC autoinstaller PXE configuration
+
+fail() {
+    echo "$@"
+    exit 1
+}
+
+test -f /usr/lib/PXELINUX/pxelinux.0 &>/dev/null || fail "This script requires pxelinux and syslinux-common"
+test -f /usr/lib/syslinux/modules/bios/ldlinux.c32 &>/dev/null || fail "This script requires pxelinux and syslinux-common"
+sudo -n true &>/dev/null || fail "The user running this script must have sudo privileges."
+
+outputdir="pvc-installer-pxe_$(date +%Y-%m-%d)/"
+deployusername="deploy"
+
+show_help() {
+    echo -e "PVC install PXE generator"
+    echo
+    echo -e " Generates a mostly-automated installer PXE image for a PVC node base system."
+    echo -e " This setup is designed to be used with the pvcbootstrapd system; for a normal"
+    echo -e " installation, use buildiso.sh instead."
+    echo
+    echo -e "Usage: $0 [-h] [-o <outputdirectory>] [-u username]"
+    echo
+    echo -e "   -h: Display this help message."
+    echo -e "   -o: Create the PXE images under <outputdirectory> instead of the default."
+    echo -e "   -u: Change 'deploy' user to a new username."
+    echo -e "   -a: Preserve live-build artifacts (passed through to buildiso.sh)."
+    echo -e "   -k: Preserve live-build config (passed through to buildiso.sh)."
+    echo -e "   -i: Preserve live-build ISO image."
+}
+
+while getopts "h?o:u:aki" opt; do
+    case "$opt" in
+        h|\?)
+            show_help
+            exit 0
+        ;;
+        o)
+            outputdir="$OPTARG"
+        ;;
+        u)
+            deployusername=$OPTARG
+        ;;
+        a)
+            preserve_artifacts='-a'
+        ;;
+        k)
+            preserve_livebuild='-l'
+        ;;
+        i)
+            preserve_liveiso='y'
+        ;;
+    esac
+done
+
+cleanup() {
+    echo -n "Cleaning up... "
+    echo "done."
+    echo
+}
+
+fail() {
+    echo $@
+    cleanup
+    exit 1
+}
+
+build_iso() {
+	if [[ ! -f pvc-installer_pxe-tmp.iso ]]; then
+	    ./buildiso.sh \
+            -o pvc-installer_pxe-tmp.iso \
+            -u ${deployusername} \
+            ${preserve_artifacts} \
+            ${preserve_livebuild}
+	fi
+}
+
+build_pxe() {
+    mkdir -p ${outputdir} ${outputdir}/boot
+
+    echo -n "Mounting temporary ISO file... "
+    tmpdir=$( mktemp -d )
+    sudo mount pvc-installer_pxe-tmp.iso ${tmpdir} &>/dev/null
+    echo "done."
+
+    echo -n "Copying live boot files... "
+    cp ${tmpdir}/live/filesystem.squashfs ${outputdir}/
+    cp ${tmpdir}/live/vmlinuz ${outputdir}/
+    cp ${tmpdir}/live/initrd.img ${outputdir}/
+    echo "done."
+
+    echo -n "Unmounting and removing temporary ISO file... "
+    sudo umount ${tmpdir}
+    rmdir ${tmpdir}
+    echo "done."
+
+    echo -n "Creating base iPXE configuration... "
+    cat <<EOF > ${outputdir}/boot.pxe
+#!ipxe
+
+# Set global variables
+set root-url tftp://\${next-server}
+set host-url tftp://\${next-server}/host
+
+# Load host/mac-*.ipxe if present (per-host host-args configuration)
+chain --autofree \${host-url}/mac-\${mac:hexraw}.ipxe ||
+
+set menu-default pvc-installer
+set submenu-default pvc-installer
+
+:pvc-installer
+kernel \${root-url}/vmlinuz
+initrd \${root-url}/initrd.img
+imgargs vmlinuz console=tty0 console=ttyS0,115200n8 boot=live components timezone=America/Toronto fetch=\${root-url}/filesystem.squashfs username=root \${host-args}
+boot
+EOF
+	echo "done."
+
+	sudo chown -R $(whoami) ${outputdir}
+	sudo chmod -R u+w ${outputdir}
+
+    if [[ -z ${preserve_liveiso} ]]; then
+        echo -n "Removing temporary ISO... "
+        rm pvc-installer_pxe-tmp.iso &>/dev/null
+        echo "done."
+    fi
+}
+
+build_iso
+build_pxe
+cleanup
+
+echo "PVC Live Installer PXE generation complete."