451 lines
13 KiB
Bash
Executable File
451 lines
13 KiB
Bash
Executable File
#!/bin/bash
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# - builds a generic image from a stage3 tarball and portage snapshot
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#
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# based on work from JD Harrington https://github.com/psi/gentoo-aws
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# and Matsuu Takuto https://gist.github.com/870789
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#===============================================================================
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GENTOO_MIRROR="http://distfiles.gentoo.org"
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LOCAL_CACHE=/var/tmp
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CHROOT=/mnt/gentoo
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set -o nounset
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die() {
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echo $@
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exit 1
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}
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verify_digest() {
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local FILE_NAME=$1
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local TYPE=$2
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local DIGEST=$3
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local PURGE=$4
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case $TYPE in
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sha512)
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FILE_DIGEST=$(sha512sum ${FILE_NAME} | awk '{print $1}')
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;;
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md5)
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FILE_DIGEST=$(md5sum ${FILE_NAME} | awk '{print $1}')
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;;
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*)
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echo "Unknown DIGEST"
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return 1
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;;
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esac
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if [ "${FILE_DIGEST}" = "${DIGEST}" ]; then
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echo "${TYPE} checksum for ${FILE_NAME} verified."
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return 0
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else
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echo "Invalid checksum for ${FILE_NAME}!"
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[ "x${PURGE}" != "x" ] && { echo "Removing cached copy." ; rm -f ${FILE_NAME}; }
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return 1
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fi
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}
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fetch_file() {
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local URL=$1
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local DIGEST_URL=$2
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local FILE_NAME=$(basename ${URL})
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local DIGEST_TYPE
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# Check cache
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if [ ! -d ${LOCAL_CACHE} ] || [ ! -w ${LOCAL_CACHE} ]; then
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echo "Cannot write to cache ${LOCAL_CACHE}"
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return 1
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fi
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# If DIGEST requested get it
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if [ ! -z ${DIGEST_URL} ]; then
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DIGEST=$(curl -s -S ${DIGEST_URL} | grep -A1 -e "^# SHA512 HASH" | grep -o -E -e "^[0-9a-f]{128} *${FILE_NAME}$" | awk '{print $1}')
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if [ -z ${DIGEST} ]; then
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# Let's try md5sum before giving up
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DIGEST=$(curl -s -S ${DIGEST_URL} | grep -o -E -e "^[0-9a-f]{32} *${FILE_NAME}$" | awk '{print $1}')
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if [ -z ${DIGEST} ]; then
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echo "Unable to get checksum for ${FILE_NAME}, abort"
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return 2
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fi
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DIGEST_TYPE="md5"
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else
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DIGEST_TYPE="sha512"
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fi
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fi
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# Do we have local copy
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if [ -f ${LOCAL_CACHE}/${FILE_NAME} ]; then
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verify_digest ${LOCAL_CACHE}/${FILE_NAME} $DIGEST_TYPE ${DIGEST} 1
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if [ $? -eq 0 ]; then
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cp ${LOCAL_CACHE}/${FILE_NAME} .
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echo "Using cached ${LOCAL_CACHE}/${FILE_NAME}"
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return 0
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fi
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fi
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# We we are here either we didnt have a copy or the cached file was invalid
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wget -q -O ${LOCAL_CACHE}/${FILE_NAME} ${URL}
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if [ $? -eq 0 ]; then
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echo "Downloaded ${URL} to ${LOCAL_CACHE}/${FILE_NAME}"
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verify_digest ${LOCAL_CACHE}/${FILE_NAME} $DIGEST_TYPE ${DIGEST} 1
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if [ $? -ne 0 ]; then
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echo "Could not get a verified version of ${FILE_NAME}"
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return 3
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fi
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cp ${LOCAL_CACHE}/${FILE_NAME} .
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else
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echo "Cannot download ${URL}!"
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return 4
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fi
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}
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# bootstrap, download stage3 and portage snapshot
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bootstrap() {
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[ -d ${CHROOT} ] || die "${CHROOT} does not exists"
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[ -w ${CHROOT} ] || die "${CHROOT} isn't writable"
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pushd ${CHROOT} > /dev/null
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# first install stage 3
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if [ -d "usr" ] ; then
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echo "There seems to be already files in ${CHROOT} !"
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echo "Press <Ctrl+c> to abort, or <Return> to proceed without extracting stage3 ..."
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read -r REPLY
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else
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STAGE_TARBALL=${GENTOO_MIRROR}/releases/${ARCH}/autobuilds/$(curl -s ${LATEST_STAGE_FILE} | grep -v "^#" | awk '{print $1}' | head -n 1)
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fetch_file "${STAGE_TARBALL}" "${STAGE_TARBALL}.DIGESTS" || die "Cannot get ${STAGE_TARBALL}"
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echo "Extracting stage3 to ${CHROOT} ..."
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tar xpf $(basename ${STAGE_TARBALL}) || die "Extracting stage3 failed"
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rm -f $(basename ${STAGE_TARBALL})
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fi
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# Portage snapshot
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PORTAGE_SNAPSHOT="${GENTOO_MIRROR}/releases/snapshots/current/portage-latest.tar.bz2"
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_PORTAGE_MOUNTED=0
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if [ ${BIND_PORTAGE} -eq 1 ] ; then
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mkdir -p ${CHROOT}/usr/portage
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mount --bind /usr/portage ${CHROOT}/usr/portage || die "Error bind mounting /usr/portage"
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# Remember we mounted portage
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_PORTAGE_MOUNTED=1
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else
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# install latest portage snapshot
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if [ -d "usr/portage" ] ; then
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echo "There seems to be already portage files!"
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echo "Press <Ctrl+c> to abort, or <Return> to proceed without extracting portage ..."
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read -r REPLY
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else
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fetch_file "${PORTAGE_SNAPSHOT}" "${PORTAGE_SNAPSHOT}.md5sum"
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echo "Extracting latest portage snapshot to ${CHROOT}/usr ..."
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tar xf $(basename ${PORTAGE_SNAPSHOT}) -C "${CHROOT}/usr" || die "Extracting portage snapshot failed"
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rm -f portage-latest.tar.bz2
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fi
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fi
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popd
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}
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# setup_chroot CHROOT
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setup_chroot() {
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# mount pseudo filesystems
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echo "Mounting pseudo filesystems..."
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mount -t proc none ${CHROOT}/proc || die "Error mounting /proc"
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mount --rbind /dev ${CHROOT}/dev || die "Error mounting /dev"
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mount --rbind /sys ${CHROOT}/sys || die "Error mounting /sys"
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# Needed at least to emerge python
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mkdir -p ${CHROOT}/run/shm && mount -t tmpfs none ${CHROOT}/run/shm
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# resolve.conf
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echo "Installing resolv.conf..."
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cp -L /etc/resolv.conf ${CHROOT}/etc/resolv.conf || die "Can't copy resolv.conf"
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}
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# Actually prepare the install script running within chroot
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# and run it
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# https://www.gentoo.org/doc/en/handbook/handbook-amd64.xml?full=1#book_part1_chap6
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install_gentoo() {
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if [ ${INTERACTIVE} -eq 1 ]; then
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echo "Done. Entering chroot environment. All yours..."
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chroot ${CHROOT} /bin/bash
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else
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# Install make.conf
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if [ "x${MAKE_CONF}" != "x" ]; then
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[ -r ${MAKE_CONF} ] || die "Cannot read custom make.conf ${MAKE_CONF}"
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echo "Using custom make.conf"
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cp ${MAKE_CONF} ${CHROOT}/etc/portage/
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fi
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[ -r ${KERNEL_CONF} ] || die "Cannot read kernel config ${KERNEL_CONF}"
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cp ${KERNEL_CONF} ${CHROOT}/tmp/.config
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# From here we create the install script and execute it within the chroot at the end
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cat << 'EOF' > ${CHROOT}/tmp/install.sh
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#!/bin/bash
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set -e
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source /etc/profile
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export PS1="(chroot) $PS1"
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CPUS=$(nproc)
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[ $CPUS -ge 8 ] && JOBS="--jobs 4"
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EOF
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# Sync portage if not mounted
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if [ ${_PORTAGE_MOUNTED} -eq 0 ]; then
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cat << 'EOF' >> ${CHROOT}/tmp/install.sh
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echo "Syncing portage snapshot..."
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emerge --sync --quiet
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mkdir -p /usr/portage/distfiles
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chown portage: /usr/portage/distfiles
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EOF
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fi
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# eselect profile
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cat << EOF >> ${CHROOT}/tmp/install.sh
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echo "Setting profile to ${ESELECT_PROFILE}"
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eselect profile set ${ESELECT_PROFILE}
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echo "Setting timezone to ${TIMEZONE}"
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echo ${TIMEZONE} > /etc/timezone
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emerge --config sys-libs/timezone-data
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echo "Setting locale to C"
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eselect locale set C
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source /etc/profile
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#echo "Setting linker to gold"
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#binutils-config --linker ld.gold
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EOF
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# Updating world, using our make.conf and settings
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cat << 'EOF' >> ${CHROOT}/tmp/install.sh
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echo "Updating stage3 to latest versions and new USE flags..."
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emerge --update --deep --newuse --accept-properties=-interactive --with-bdeps=y ${JOBS} world
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dispatch-conf
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EOF
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# Compile kernel
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# Unmask dracut
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echo "sys-kernel/dracut" >> ${CHROOT}/etc/portage/package.keywords
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# Disable dhcp server part
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echo "net-misc/dhcp -server" >> ${CHROOT}/etc/portage/package.use
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# Disable thin provisioning in order to NOT have to add boost
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echo "sys-fs/lvm2 -thin" >> ${CHROOT}/etc/portage/package.use
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# Dracut needs dhcp rather than dhcpcd
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cat << EOF >> ${CHROOT}/tmp/install.sh
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echo "Installing kernel sources, dracut and dependencies..."
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emerge -n sys-kernel/${KERNEL_FLAVOR}-sources
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mv /tmp/.config /usr/src/linux
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emerge -n ${JOBS} net-misc/dhcp net-misc/curl sys-apps/iproute2 sys-fs/cryptsetup app-crypt/gnupg sys-fs/lvm2 sys-fs/mdadm sys-boot/grub sys-kernel/dracut
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# Stuff for encrypted root
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emerge -n ${JOBS} net-misc/dropbear sys-fs/eudev
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EOF
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# Now lets actually build and install the kernel incl. initrd
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cat << 'EOF' >> ${CHROOT}/tmp/install.sh
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echo "Compiling custom kernel..."
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cd /usr/src/linux
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make olddefconfig
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#make menuconfig
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make all ${MAKEOPTS}
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make modules_install
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NEW=$(make kernelversion)
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#Hack
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cd ..
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tar xfz /tmp/dracut.tgz
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cd dracut
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./dracut.sh -l --xz --force --strip -m "bash caps i18n terminfo base shutdown usrmount kernel-modules lvm mdraid crypt crypt-ssh rescue" /boot/initrd-${NEW} ${NEW}
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cd ../linux
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#dracut --xz --force --strip /boot/initrd-${NEW} ${NEW}
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make install
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pushd /boot >/dev/null
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ln -sf System.map-${NEW} System.map
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popd > /dev/null
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echo "Installed custom kernel"
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echo "Writing /etc/fstab"
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echo -e "UUID=$(findmnt /boot -o uuid -n)\t/boot\txfs\tdiscard,noatime\t0 1" > /etc/fstab
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echo -e "UUID=$(findmnt / -o uuid -n)\t/\txfs\tdiscard,noatime\t0 1" >> /etc/fstab
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echo "Setting eth0 to dhcp"
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echo 'config_eth0="dhcp"' > /etc/conf.d/net
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cd /etc/init.d
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ln -s net.lo net.eth0
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rc-update add net.eth0 default
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echo "Enabling sshd..."
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rc-update add sshd default
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echo "Installing various tools..."
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emerge -n ${JOBS} sys-fs/xfsprogs sys-process/cronie app-admin/sudo app-editors/vim app-misc/screen app-portage/eix app-portage/gentoolkit net-misc/ntp app-admin/syslog-ng
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rc-update add cronie default
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rc-update add ntpd default
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rc-update add lvm boot
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rc-update add mdraid boot
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echo "Finally installing grub bootloader on /dev/sda..."
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echo -e "GRUB_HIDDEN_TIMEOUT=1" >> /etc/default/grub
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echo -e "GRUB_HIDDEN_TIMEOUT_QUIET=true" >> /etc/default/grub
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echo -e "GRUB_FORCE_HIDDEN_MENU=true" >> /etc/default/grub
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echo -e "GRUB_DISABLE_RECOVERY=true" >> /etc/default/grub
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echo -e "GRUB_TERMINAL=console" >> /etc/default/grub
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echo -e "GRUB_CMDLINE_LINUX_DEFAULT=\"nosplash rd.luks.uuid=$(blkid | grep crypto_LUKS | awk '{print $2}' | sed -e 's/UUID=//' | sed -e 's/"//g') rd.lvm.vg=disks rd.luks.allow-discards cgroup_disable=memory rd.ip=dhcp rd.neednet=1 rd.luks.ssh=1\"" >> /etc/default/grub
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grub2-install /dev/sda
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grub2-mkconfig -o /boot/grub/grub.cfg
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EOF
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chmod 755 ${CHROOT}/tmp/install.sh
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chroot ${CHROOT} /tmp/install.sh
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echo "Done !"
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echo "Press <Return> to tear down the chroot environment once you are done."
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echo "And dont' forget to either drop /root/.ssh/authorized_keys or other means of access..."
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read -r REPLY
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fi
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}
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# Clean up host
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cleanup() {
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for dir in proc dev sys; do
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umount -R ${CHROOT}/$dir 2> /dev/null
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done
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if [ ${_PORTAGE_MOUNTED} != 0 ]; then
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umount ${CHROOT}/usr/portage
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else
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rm -rf ${CHROOT}/usr/portage/distfiles/*
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fi
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# Clean up chroot
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rm -rf ${CHROOT}/tmp/*
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rm -rf ${CHROOT}/var/tmp/*
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}
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# print usage
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usage() {
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cat << EOF
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Usage: $0 [options]
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This script builds a full Gentoo chroot
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OPTIONS:
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-h Show this message
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-a arch, either i686 or x86_64, defaults to uname -m
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-p profile, [ hardened * | hardened-no-multilib | default ]
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-t The timezone to use, default to UTC
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-r chroot location (default $CHROOT )
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-c local cache (default $LOCAL_CACHE)
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-b bind mount portage tree from, instead of downloading portage snapshot
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-i interactive, enter chroot only, do NOT run install script
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-m use custom make.conf
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-s kernel flavor, [ hardened | gentoo* ]
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-k kernel .config used to build custom kernel
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-d debug (set -x)
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EOF
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}
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DEBUG=0
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INTERACTIVE=0
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MAKE_CONF=""
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BIND_PORTAGE=0
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while getopts ":a:p:t:r:c:m:bk:s:dhi" OPTIONS; do
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case $OPTIONS in
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a ) ARCH=$OPTARG;;
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p ) PROFILE=$OPTARG;;
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t ) TIMEZONE=$OPTARG;;
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d ) DEBUG=1;;
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b ) BIND_PORTAGE=1;;
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r ) CHROOT=$OPTARG;;
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c ) LOCAL_CACHE=$OPTARG;;
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i ) INTERACTIVE=1;;
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m ) MAKE_CONF=$OPTARG;;
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k ) KERNEL_CONF=$OPTARG;;
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s ) KERNEL_FLAVOR=$OPTARG;;
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? )
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usage
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exit
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;;
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esac
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done
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# Do some sanity checks first
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if [ "$(id -u)" != "0" ]; then
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die "Sorry, but we need root permissions to create DEVICE nodes etc.!"
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fi
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ARCH=${ARCH-"$(uname -m)"}
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PROFILE=${PROFILE="hardened"}
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TIMEZONE=${TIMEZONE-"UTC"}
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KERNEL_CONF=${KERNEL_CONF-"/usr/src/linux/.config"}
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KERNEL_FLAVOR=${KERNEL_FLAVOR-"gentoo"}
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if [ "${ARCH}" = "i686" ] ; then
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# Why do they use x86 here ? :(
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STAGE_PATH="${GENTOO_MIRROR}/releases/x86/autobuilds"
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elif [ "${ARCH}" = "x86_64" ] ; then
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ARCH="amd64"
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STAGE_PATH="${GENTOO_MIRROR}/releases/${ARCH}/autobuilds"
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elif [ "${ARCH}" = "amd64" ] ; then
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STAGE_PATH="${GENTOO_MIRROR}/releases/${ARCH}/autobuilds"
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else
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die "Unknown architecture!"
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fi
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if [ "${PROFILE}" = "hardened" ] ; then
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LATEST_STAGE_FILE="${STAGE_PATH}/latest-stage3-${ARCH}-hardened.txt"
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ESELECT_PROFILE="hardened/linux/${ARCH}"
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elif [ "${PROFILE}" = "hardened-no-multilib" ] ; then
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LATEST_STAGE_FILE="${STAGE_PATH}/latest-stage3-${ARCH}-hardened+nomultilib.txt"
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ESELECT_PROFILE="hardened/linux/${ARCH}/no-multilib"
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elif [ "${PROFILE}" = "default" ] ; then
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LATEST_STAGE_FILE="${STAGE_PATH}/latest-stage3-${ARCH}.txt"
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ESELECT_PROFILE="default/linux/${ARCH}/13.0"
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else
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die "Unknown profile!"
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fi
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if [ ${DEBUG} -eq 1 ]; then
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set -x
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fi
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bootstrap
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# From here make sure we don't leave stuff around on the host
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trap "cleanup" INT TERM EXIT
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setup_chroot
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install_gentoo
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