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#!/bin/bash
#
# Stage4 addons setup script
#
###############################################################################
# Support stage4 addons residing under '/opt/openslx/addons'.
# This script will loop over all addons found, in the form of
# directories containing directory structures relative to '/'
#
# Additionally addons are expected to provide:
# * <addon_dir>/addon-required -> script to check whether the
# addon should be installed (exit 0) or not (exit 1).
#
# * <addon_dir>/opt/openslx/etc/<addon_name>.whiteout -> list of files
# that were removed during the addon installation and thus need to be
# removed after the addon was installed.
#
# * <addon_dir>/opt/openslx/etc/<addon_name> ld.so.cache -> ld cache containing
# the newly installed libraries. CAVE: multiple addons -> ld cache combination
#
### CURRENTLY NOT EXECUTED
# * <addon_dir>/addon-init -> script that will be automatically
# be executed after the addon was installed.
# NOTE: question remains if this should be done within stage3
# or by chroot'ing into the stage4 before executing it.
### CURRENTLY NOT EXECUTED: Since whiteouts could be handled for _all_addons
# Check if we even have any addons to process
if ! [ -d "$NEWROOT/opt/openslx/addons" ]; then
echo "No stage4 addons found."
exit 0
fi
# This just activates the ldconfig service to run during the sysinit target
# Since addons are likely to install libs, this is necessary to garantee
# that the live system "sees" the libraries.
activate_stage4_ldconfig() {
local service_path="/opt/openslx/services/ldconfig-stage4.service"
[ -e "$service_path" ] || return 1
local target_dir="${NEWROOT}/etc/systemd/system/sysinit.target.wants"
mkdir -p "$target_dir"
cp -f "$service_path" "${NEWROOT}/etc/systemd/system/${service_path##*/}"
ln -sf "../${service_path##*/}" "${target_dir}/${service_path##*/}"
}
setup_addon() {
if [ ! -d "$1" ]; then
echo "Given '$1' not a directory, skipping."
return 1
fi
local addon_dir="$1"
cd "$addon_dir" || return 1
if ! bash addon-required 2>&1 ; then
echo "'./addon-required' missing or returned non-zero, skipping..."
return 1
fi
# purge addon-* files
rm -f -- addon-*
# make directory struct, replicate owners/perms - should we keep-old-files?
echo "Replicating directory tree in $NEWROOT"
# Doing this once in advance instead of doing a mkdir for each file's parent directory
# every time in the loop below brought us from 3.6s down to 2.2s for VMware
find . -type d -print0 | tar --no-recursion --null -T - -c | tar -C "$NEWROOT" --keep-old-files -x
# move all the files over
echo "Moving files over"
while read -r entry || [ -n "$entry" ]; do
# Doing the mv in parallel brought us from 2.2s to 380ms for VMware (~850 files),
# but I've no idea if there'd be an adverse effect if we had a lot more files
# to move and we'd spawn thousands of mv processes in parallel...
mv -f -- "$entry" "${NEWROOT}/${entry}" &
done < <( find . \! -type d ) # do it this way so we don't end up with a pipe-subshell
wait # and can properly wait for all the mv processes.
# post merge: remove files marked as whiteouts
# (e.g. they were removed during the addon installation)
echo "Applying whiteouts"
for WHITEOUT in "$NEWROOT/opt/openslx/etc/"*.whiteout; do
[ -e "$WHITEOUT" ] || continue
while read -r line; do
rm -f -- "${NEWROOT}/${line}"
done < "$WHITEOUT"
done
return 0
}
active=()
for addon in "${NEWROOT}/opt/openslx/addons/"*; do
echo "Checking addon ${addon##*/}..."
if setup_addon "$addon"; then
active+=( "${addon##*/}" )
echo "Activated '${addon##*/}'"
fi
done
# if only one addon was installed, use its pre-generated ld.so.cache
# if more than one were installed, make sure ldconfig is called in stage4
if [ "${#active[@]}" -eq 1 ]; then
addon_cache="${NEWROOT}/opt/openslx/etc/${active[0]}.ld.so.cache"
if [ -e "$addon_cache" ]; then
echo "Using ld.so.cache of '${active[0]}'."
mv -f -- "${NEWROOT}/etc/ld.so.cache"{,.stage4}
mv -f -- "$addon_cache" "${NEWROOT}/etc/ld.so.cache"
fi
elif [ "${#active[@]}" -gt 1 ]; then
echo "Activating ldconfig in stage4 due to multiple loaded addons: ${active[*]}"
activate_stage4_ldconfig
fi
exit 0
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