systemd/systemd-sysv-convert

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#!/bin/bash
if [ "$UID" != "0" ]; then
echo Need to be root.
exit 1
fi
declare -A results_runlevel
declare -A results_priority
usage() {
cat << EOF
usage: systemd-sysv-convert [-h] [--save] [--show] [--apply]
SERVICE [SERVICE ...]
EOF
}
help() {
usage
cat << EOF
Save and Restore SysV Service Runlevel Information
positional arguments:
SERVICE Service names
optional arguments:
-h, --help show this help message and exit
--save Save SysV runlevel information for one or more services
--show Show saved SysV runlevel information for one or more services
--apply Apply saved SysV runlevel information for one or more services
to systemd counterparts
EOF
}
find_service() {
local service
local runlevel
declare -i priority
service=$1
runlevel=$2
priority=-1
for l in $(ls /etc/rc.d/rc$runlevel.d/) ; do
initscript=$(basename $l)
if [ ${initscript:0:1} != "S" -o ${initscript:3} != "$service" ]; then
continue
fi
if [ ${initscript:1:2} -ge 0 -a ${initscript:1:2} -le 99 -a ${initscript:1:2} -ge $priority ]; then
if [ ${initscript:1:1} == 0 ]; then
priority=${initscript:2:1}
else
priority=${initscript:1:2}
fi
fi
done
if [ $priority -ge 0 ]; then
return $priority
else
return 255
fi
}
lookup_database() {
local services
local service
local service_file
local runlevel
local priority
local -i k
declare -a parsed
services=$@
k=0
results_runlevel=()
results_priority=()
while read line ; do
k+=1
parsed=($line)
service=${parsed[0]}
runlevel=${parsed[1]}
priority=${parsed[2]}
if [ $runlevel -lt 2 -o $runlevel -gt 5 ]; then
echo "Runlevel out of bounds in database line $k. Ignoring" >/dev/stderr
continue
fi
if [ $priority -lt 0 -o $priority -gt 99 ]; then
echo "Priority out of bounds in database line $k. Ignoring" >/dev/stderr
continue
fi
declare -i found
found=0
for s in $services ; do
if [ $s == $service ]; then
found=1
continue
fi
done
if [ $found -eq 0 ]; then
continue
fi
results_runlevel[$service]+=" $runlevel"
results_priority[$service]+=" $priority"
done < /var/lib/systemd/sysv-convert/database
}
case "$1" in
-h|--help)
help
exit 0
;;
--save)
shift
for service in $@ ; do
if [ ! -r "/etc/init.d/$service" ]; then
echo "SysV service $service does not exist" >/dev/stderr
exit 1
fi
for runlevel in 2 3 4 5; do
find_service $service $runlevel
priority=$?
if [ $priority -lt 255 ]; then
echo "$service $runlevel $priority"
fi
done >>/var/lib/systemd/sysv-convert/database
done
;;
--show)
shift
services=$@
lookup_database $services
fail=0
for service in $services; do
if [ -z "${results_runlevel[$service]}" ]; then
echo No information found about service $service found. >/dev/stderr
fail=1
continue
fi
declare -i count
count=0
priority=(${results_priority[$service]})
for runlevel in ${results_runlevel[$service]}; do
echo SysV service $service enabled in runlevel $runlevel at priority ${priority[$count]}
count+=1
done
done
exit $fail
;;
--apply)
shift
services=$@
for service in $services; do
if [ ! -f "/lib/systemd/system/$service.service" -a ! -f "/usr/lib/systemd/system/$service.service" ]; then
echo systemd service $service.service does not exist. >/dev/stderr
exit 1
fi
done
lookup_database $services
for service in $services; do
[ -f "/lib/systemd/system/$service.service" ] && service_file="/lib/systemd/system/$service.service"
[ -f "/usr/lib/systemd/system/$service.service" ] && service_file="/usr/lib/systemd/system/$service.service"
# If $service is not present in the database,
# then it simply means that the sysv init
# service was not enabled at all.
for runlevel in ${results_runlevel[$service]}; do
echo ln -sf $service_file /etc/systemd/system/runlevel$runlevel.target.wants/$service.service >/dev/stderr
mkdir -p "/etc/systemd/system/runlevel$runlevel.target.wants"
/bin/ln -sf $service_file /etc/systemd/system/runlevel$runlevel.target.wants/$service.service
done
done
;;
*) usage
exit 2;;
esac