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