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quarks/scripts/update_portage.sh

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#!/bin/sh
#set -x
# Default portage location
PORTAGE="/usr/portage"
# By default store SquashFS backing file under /mnt/portage
SQFS_PORTAGE="/mnt/portage/portage.sqfs"
# Store temporary overlayFS within portage tmpdir
OVERLAY="$(portageq envvar PORTAGE_TMPDIR)/portage.overlayfs"
OVERLAY_NAME=portage_overlay
usage () {
cat << EOF
Usage: $0 [-p portage_tree] [-s squashfs_file]
EOF
exit 0
}
# mount squashed portage incl. writeable overlay
mount_overlay () {
# Make sure backing tree is mounted, try to mount otherwise
mountpoint -q ${PORTAGE} || mount ${PORTAGE} && echo "Mounted ${PORTAGE}."
# mount the overlay on top of existing live portage tree
mkdir -p ${OVERLAY} ${OVERLAY}.work
mount | grep -q ${OVERLAY_NAME} || mount -t overlay ${OVERLAY_NAME} \
-olowerdir=${PORTAGE},upperdir=${OVERLAY},workdir=${OVERLAY}.work \
${PORTAGE} && echo "Mounted Overlay file system."
}
# umount overlay and clean up temp dirs
umount_overlay () {
mount | grep -q ${OVERLAY_NAME}
if [ $? -eq 0 ]; then
umount ${OVERLAY_NAME} && rm -rf ${OVERLAY} ${OVERLAY}.work
echo "Overlay file system unmounted."
fi
}
# umount current, replace and mount new
replace_squashfs () {
[ -f ${SQFS_PORTAGE}.new ] || \
{ echo "No new portage tree version found!"; exit 1; }
mountpoint -q ${PORTAGE}
if [ $? -eq 0 ]; then
umount ${PORTAGE} && echo "Unmounted ${PORTAGE}."
if [ $? -ne 0 ]; then
echo "Could not unmount ${PORTAGE} !"
echo "New portage snapshot is at ${SQFS_PORTAGE}.new"
exit 1
fi
fi
if [ -f ${SQFS_PORTAGE} ]; then
mv ${SQFS_PORTAGE} ${SQFS_PORTAGE}.previous
else
echo "No current squashFS backing file ${SQFS_PORTAGE} found,\
assuming initial setup."
fi
mv ${SQFS_PORTAGE}.new ${SQFS_PORTAGE} && \
mount ${PORTAGE} && echo "Mounted new snapshot at ${PORTAGE}."
}
# Create new squashfs image
create_squashfs () {
echo 'Creating new SquashFS snapshot ...'
mksquashfs ${PORTAGE} ${SQFS_PORTAGE}.new -comp xz -noappend \
-no-progress 1>/dev/null && echo "SquashFS snapshot created at ${SQFS_PORTAGE}.new"
}
# Any custom changes to the portage tree
customize () {
echo "Applying local customizations ..."
# Linphone
perl -i -p -e 's/^(net-voip\/linphone|net-libs\/libeXosip|net-libs\/libosip)/# disabled by update_portage.sh - $1/;' ${PORTAGE}/profiles/package.mask
}
cleanup () {
# In case still mounted
umount_overlay
# Remove potential left overs from mksquashfs
rm -f ${SQFS_PORTAGE}.new
# Make sure we have a working portage tree mounted
mountpoint -q ${PORTAGE} || mount ${PORTAGE}
exit 1
}
while getopts "p:s:" OPTIONS; do
case $OPTIONS in
p) PORTAGE=$OPTARG;;
s) SQFS_PORTAGE=$OPTARG;;
?) usage;;
esac
done
[ -d ${PORTAGE} ] || { echo "${PORTAGE} is not a directory!"; usage; }
# make sure we clean up and have a working portage tree if interupted
trap "cleanup" INT TERM
mount_overlay
# End early if there are no upstream changes
# assume if rsync is run only once that no upstream changes available
echo 'Syncing gentoo portage tree ...'
RUNS=$(emaint sync -r gentoo 2>/dev/null | grep -c 'Number of files')
[ $RUNS -eq 1 ] && { echo 'No upstream changes. Exiting.'; cleanup; }
# Optional step to customize the tree, mostly to alter upstream use masks
customize
create_squashfs
umount_overlay
replace_squashfs