Replace old buildiso.sh with live-build script

The old script was cumbersome and complex. Replace it with a script that
leverages the Debian live-build (lb) framework to simplify the script
and configuration as well as minimize sprawl in the final image (~40MB
savings).

buildiso.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Generate a PVC autoinstaller ISO
+# Generate a PVC autoinstaller ISO via live-build
 
 # This ISO makes a number of assumptions about the system and asks
 # minimal questions in order to streamline the install process versus
@@ -12,14 +12,8 @@ fail() {
     exit 1
 }
 
-fail=""
-which debootstrap &>/dev/null || fail="y"
-which mksquashfs &>/dev/null || fail="y"
-which xorriso &>/dev/null || fail="y"
-test -f /usr/lib/ISOLINUX/isohdpfx.bin &>/dev/null || fail="y"
-if [[ -n ${fail} ]]; then
-    fail "This script requires debootstrap, xorriso, squashfs-tools, and isolinux"
-fi
+which lb &>/dev/null || fail "This script requires live-build"
+sudo -n true &>/dev/null || fail "The user running this script must have sudo privileges."
 
 isofilename="pvc-installer_$(date +%Y-%m-%d).iso"
 deployusername="deploy"
@@ -27,26 +21,18 @@ deployusername="deploy"
 show_help() {
     echo -e "PVC install ISO generator"
     echo
-    echo -e " Generates a mostly-automated installer ISO for a PVC node base system. The ISO"
-    echo -e " boots, then runs 'install.sh' to perform the installation to a target server."
-    echo -e " This script prompts for a few questions on startup to configure the system, then"
-    echo -e " performs the remaining installation to PVC node specifications unattended,"
-    echo -e " including configuring networking on the selected interface, wiping the selected"
-    echo -e " disk, partitioning, installing the base OS, and performing some initial"
-    echo -e " configuration to allow the PVC Ansible role to take over after completion."
+    echo -e " Generates a mostly-automated installer ISO for a PVC node base system via lb."
     echo
-    echo -e "Usage: $0 [-h] [-o <output_filename>] [-s <liveiso_source_url>] [-a] [-u username]"
+    echo -e "Usage: $0 [-h] [-o <output_filename>] [-u username] [-a]"
     echo
     echo -e "   -h: Display this help message."
     echo -e "   -o: Create the ISO as <output_filename> instead of the default."
-    echo -e "   -s: Obtain the source Debian Live ISO from <liveiso_source_url> instead of"
-    echo -e "       the default."
-    echo -e "   -a: Use cached squashfs artifact during rebuild (cached ISO and debootstrap"
-    echo -e "       artifacts are always used)."
     echo -e "   -u: Change 'deploy' user to a new username."
+    echo -e "   -a: Preserve live-build artifacts."
+    echo -e "   -k: Preserve live-build config."
 }
 
-while getopts "h?o:s:au:" opt; do
+while getopts "h?o:u:ak" opt; do
     case "$opt" in
         h|\?)
             show_help
@@ -55,161 +41,102 @@ while getopts "h?o:s:au:" opt; do
         o)
             isofilename=$OPTARG
         ;;
-        s)
-            srcliveisourl=$OPTARG
-        ;;
-        a)
-            usecachedsquashfs='y'
-        ;;
         u)
             deployusername=$OPTARG
         ;;
+        a)
+            preserve_artifacts='y'
+        ;;
+        k)
+            preserve_livebuild='y'
+        ;;
     esac
 done
 
-srcliveisopath="https://cdimage.debian.org/mirror/cdimage/release/current-live/amd64/iso-hybrid"
-srcliveisofilename="$( wget -O- ${srcliveisopath}/ 2>/dev/null | grep 'debian-live-.*-amd64-standard.iso' | awk -F '"' '{ print $6 }' )"
-srcliveisourl="${srcliveisopath}/${srcliveisofilename}"
-srcliveisofile="$( basename ${srcliveisourl} )"
+PACKAGE_LIST_MAIN="live-tools linux-image-amd64 mdadm lvm2 parted gdisk debootstrap grub-pc-bin grub-efi-amd64 sipcalc vim ca-certificates vlan"
+PACKAGE_LIST_NONFREE="firmware-bnx2 firmware-bnx2x"
 
-tempdir=$( mktemp -d )
+mkdir -p artifacts/lb
+pushd artifacts/lb
 
-cleanup() {
-    echo -n "Cleaning up... "
-    sudo rm -rf ${tempdir} &>/dev/null
-    echo "done."
-    echo
-}
+# Initialize the live-build config
+lb config --distribution buster --architectures amd64 --archive-areas "main contrib non-free" --apt-recommends false
 
-fail() {
-    echo $@
-    cleanup
-    exit 1
-}
+# Configure the "standard" live task (no GUI)
+echo "live-task-standard" > config/package-lists/desktop.list.chroot
 
-prepare_iso() {
-    echo -n "Creating temporary directories... "
-    if [[ ! -d artifacts ]]; then
-        mkdir artifacts &>/dev/null || fail "Error creating artifacts directory."
-    fi
-    mkdir ${tempdir}/rootfs/ ${tempdir}/installer/ &>/dev/null || fail "Error creating temporary directories."
-    echo "done."
+# Add additional live packages
+echo ${PACKAGE_LIST_MAIN} > config/package-lists/installer.list.chroot
+echo ${PACKAGE_LIST_NONFREE} > config/package-lists/nonfree.list.chroot
 
-    echo -n "Downloading Debian Live ISO... "
-    if [[ ! -f artifacts/${srcliveisofile} ]]; then
-        wget -O artifacts/${srcliveisofile} ${srcliveisourl} &>/dev/null || { rm -f artifacts/${srcliveisofile}; fail "Error downloading source ISO."; }
-        echo "done."
-    else
-        echo "using cached file 'artifacts/${srcliveisofile}'."
-    fi
+# Add root password hook
+mkdir -p config/includes.chroot/lib/live/config/
+cat <<EOF > config/includes.chroot/lib/live/config/2000-remove-root-pw
+#!/bin/sh
+echo "I: remove root password"
+passwd --delete root
+EOF
+chmod +x config/includes.chroot/lib/live/config/2000-remove-root-pw
 
-    echo -n "Extracting Debian Live ISO files... "
-    iso_tempdir=$( mktemp -d )
-    sudo mount artifacts/${srcliveisofile} ${iso_tempdir} &>/dev/null || fail "Error mounting Live ISO file."
-    sudo rsync -a --exclude live/filesystem.squashfs --exclude isolinux/menu.cfg --exclude isolinux/stdmenu.cfg ${iso_tempdir}/ ${tempdir}/installer/ &>/dev/null || fail "Error extracting Live ISO files."
-    sudo umount ${iso_tempdir} &>/dev/null || fail "Error unmounting Live ISO file."
-    rmdir ${iso_tempdir} &>/dev/null
-    echo "done."
-}
+# Set root bashrc
+mkdir -p config/includes.chroot/root
+echo "/install.sh" > config/includes.chroot/root/.bashrc
 
-prepare_rootfs() {
-    echo -n "Preparing Debian live installation via debootstrap... "
-    SQUASHFS_PKGLIST="mdadm,lvm2,parted,gdisk,debootstrap,grub-pc,grub-efi-amd64,linux-image-amd64,sipcalc,live-boot,dosfstools,vim,ca-certificates,vlan"
-    if [[ ! -d artifacts/debootstrap ]]; then
-        sudo mkdir -p artifacts/debootstrap/var/cache/apt/archives &>/dev/null
-        clean_me="y"
-        sudo mount --bind /var/cache/apt/archives artifacts/debootstrap/var/cache/apt/archives &>/dev/null && clean_me=""
-        sudo /usr/sbin/debootstrap \
-            --include=${SQUASHFS_PKGLIST} \
-            buster \
-            artifacts/debootstrap/ \
-            http://ftp.ca.debian.org/debian &>debootstrap.log || fail "Error performing debootstrap."
-        # Grab some additional files in non-free
-        sudo wget http://ftp.ca.debian.org/debian/pool/non-free/f/firmware-nonfree/firmware-bnx2_20190114-2_all.deb -O artifacts/debootstrap/var/cache/apt/archives/firmware-bnx2_20190114-2_all.deb
-        sudo chroot artifacts/debootstrap/ dpkg -i /var/cache/apt/archives/firmware-bnx2_20190114-2_all.deb || fail "Error installing supplemental package firmware-bnx2"
-        sudo wget http://ftp.ca.debian.org/debian/pool/non-free/f/firmware-nonfree/firmware-bnx2x_20190114-2_all.deb -O artifacts/debootstrap/var/cache/apt/archives/firmware-bnx2x_20190114-2_all.deb
-        sudo chroot artifacts/debootstrap/ dpkg -i /var/cache/apt/archives/firmware-bnx2x_20190114-2_all.deb || fail "Error installing supplemental package firmware-bnx2x"
-        if [[ -n ${clean_me} ]]; then
-            sudo chroot artifacts/debootstrap/ apt clean &>/dev/null || fail "Error cleaning apt cache in debootstrap."
-        else
-            sudo umount artifacts/debootstrap/var/cache/apt/archives &>/dev/null
-        fi
-        sudo rsync -au artifacts/debootstrap/ ${tempdir}/rootfs/ &>/dev/null || fail "Error copying debootstrap to tempdir."
-        echo "done."
-    else
-        sudo rsync -au artifacts/debootstrap/ ${tempdir}/rootfs/ &>/dev/null || fail "Error copying debootstrap to tempdir."
-        echo "using cached debootstrap 'artifacts/debootstrap'."
-    fi
-   
-    echo -n "Configuring Debian live installation... "
-    sudo cp -a artifacts/debootstrap/boot/vmlinuz* ${tempdir}/installer/live/vmlinuz &>/dev/null || fail "Error copying kernel."
-    sudo cp -a artifacts/debootstrap/boot/initrd.img* ${tempdir}/installer/live/initrd.img &>/dev/null || fail "Error copying initrd."
-    sudo cp ${tempdir}/rootfs/lib/systemd/system/getty\@.service ${tempdir}/rootfs/etc/systemd/system/getty@tty1.service &>/dev/null || fail "Error copying getty override to tempdir."
-    sudo sed -i 's|/sbin/agetty|/sbin/agetty --autologin root|g' \
-         ${tempdir}/rootfs/etc/systemd/system/getty@tty1.service &>/dev/null || fail "Error setting autologin in getty override."
-    sudo tee ${tempdir}/rootfs/etc/hostname <<<"pvc-node-installer" &>/dev/null || fail "Error setting hostname."
-    sudo tee ${tempdir}/rootfs/etc/resolv.conf <<<"nameserver 8.8.8.8" &>/dev/null || fail "Error setting resolv.conf"
-    sudo tee -a ${tempdir}/rootfs/root/.bashrc <<<"/install.sh" &>/dev/null || fail "Error setting bashrc."
-    sudo chroot ${tempdir}/rootfs/ /usr/bin/passwd -d root &>/dev/null || fail "Error disabling root password."
-    sudo cp install.sh ${tempdir}/rootfs/ &>/dev/null || fail "Error copying install.sh to tempdir."
-    sudo sed -i "s/XXISOXX/${isofilename}/g" ${tempdir}/rootfs/install.sh &>/dev/null || fail "Error editing install.sh script."
-    sudo sed -i "s/XXDEPLOYUSERXX/${deployusername}/g" ${tempdir}/rootfs/install.sh &>/dev/null || fail "Error editing install.sh script."
-    echo "done."
-    
-    echo -n "Generating squashfs image of live installation... "
-    if [[ ! -f artifacts/filesystem.squashfs || -z ${usecachedsquashfs} ]]; then
-        if [[ -f artifacts/filesystem.squashfs ]]; then
-            rm -f artifacts/filesystem.squashfs &>/dev/null
-        fi
-        sudo nice mksquashfs ${tempdir}/rootfs/ artifacts/filesystem.squashfs -e boot &>/dev/null || fail "Error generating squashfs."
-        sudo rsync -a artifacts/filesystem.squashfs ${tempdir}/installer/live/filesystem.squashfs &>/dev/null || fail "Error copying squashfs to tempdir."
-        echo "done."
-    else
-        sudo rsync -a artifacts/filesystem.squashfs ${tempdir}/installer/live/filesystem.squashfs &>/dev/null || fail "Error copying squashfs to tempdir."
-        echo "using cached squashfs 'artifacts/filesystem.squashfs'."
-    fi
-}
+# Set hostname and resolv.conf
+mkdir -p config/includes.chroot/etc
+echo "pvc-live-installer" > config/includes.chroot/etc/hostname
+echo "nameserver 8.8.8.8" > config/includes.chroot/etc/resolv.conf
 
-build_iso() {
-    echo -n "Copying live boot configurations... "
-    sudo cp -a grub.cfg ${tempdir}/installer/boot/grub/grub.cfg &>/dev/null || fail "Error copying grub.cfg file."
-    sudo cp -a theme.txt ${tempdir}/installer/boot/grub/theme.txt &>/dev/null || fail "Error copying theme.txt file."
-    sudo cp -a isolinux.cfg ${tempdir}/installer/isolinux/isolinux.cfg &>/dev/null || fail "Error copying isolinux.cfg file."
-    sudo cp -a splash.png ${tempdir}/installer/splash.png &>/dev/null || fail "Error copying splash.png file."
-    echo "done."
+# Set single vty
+mkdir -p config/includes.chroot/etc/systemd/
+cat <<EOF > config/includes.chroot/etc/systemd/logind.conf
+[Login]
+NAutoVTs=2
+EOF
 
-    echo -n "Creating LiveCD ISO... "
-    pushd ${tempdir}/installer &>/dev/null
-    xorriso \
-        -as mkisofs \
-        -iso-level 3 \
-        -o ../${isofilename} \
-        -full-iso9660-filenames \
-        -volid "PVC_NODE_INSTALLER" \
-        -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
-        -eltorito-boot \
-            isolinux/isolinux.bin \
-            -no-emul-boot \
-            -boot-load-size 4 \
-            -boot-info-table \
-            --eltorito-catalog isolinux/isolinux.cat \
-        -eltorito-alt-boot \
-            -e boot/grub/efi.img \
-            -no-emul-boot \
-            -isohybrid-gpt-basdat \
-        -append_partition 2 0xef boot/grub/efi.img \
-       . &>/dev/null || fail "Error creating ISO file."
-    popd &>/dev/null
-    echo "done."
+mkdir -p config/includes.chroot/etc/systemd/system/getty@.service.d
+cat <<EOF > config/includes.chroot/etc/systemd/system/getty@.service.d/override.conf
+[Service]
+ExecStart=
+ExecStart=-/sbin/agetty -o '-p -- \\\u' --autologin root --noclear %I \$TERM
+EOF
 
-    echo -n "Moving generated ISO to './${isofilename}'... "
-    mv -f ${tempdir}/${isofilename} ${isofilename} &>/dev/null || fail "Error moving ISO file."
-    echo "done."
-}
+mkdir -p config/includes.chroot/etc/systemd/system/serial-getty@.service.d
+cat <<EOF > config/includes.chroot/etc/systemd/system/serial-getty@.service.d/override.conf
+[Service]
+ExecStart=
+ExecStart=-/sbin/agetty -o '-p -- \\\u' --autologin root --noclear --keep-baud 115200,38400,9600 %I \$TERM
+EOF
 
-prepare_iso
-prepare_rootfs
-build_iso
-cleanup
+# Install GRUB config, theme, and splash
+mkdir -p config/includes.chroot/boot/grub
+cp ../../grub.cfg config/includes.chroot/boot/grub/grub.cfg
+cp ../../theme.txt config/includes.chroot/boot/grub/theme.txt
+cp ../../splash.png config/includes.chroot/splash.png
+
+# Install install.sh script
+cp ../../install.sh config/includes.chroot/install.sh
+chmod +x config/includes.chroot/install.sh
+
+# Customize install.sh script
+sed -i "s/XXDATEXX/$(date)/g" config/includes.chroot/install.sh
+sed -i "s/XXDEPLOYUSERXX/${deployusername}/g" config/includes.chroot/install.sh
+
+# Build the live image
+sudo lb build
+
+# Move the ISO image out
+cp live-image-amd64.hybrid.iso ../../${isofilename}
+
+# Clean up the artifacts
+if [[ -z ${preserve_artifacts} ]]; then
+    sudo lb clean
+fi
+
+popd
+
+# Clean up the config
+if [[ -z ${preserve_livebuild} ]]; then
+    sudo rm -rf artifacts/lb
+fi
 
-echo "PVC Live Installer ISO generation complete."