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quarks/dev-util/bob/build.sh

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