160 lines
3.8 KiB
Bash
Executable File
160 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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DEFAULT_POSTSTART="exec sleep 1"
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usage() {
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echo "Usage: os-svc-daemon [ -ph ] [ -s POSTSTART ] [ -e ENV ] -n SERVICENAME -u RUNAS -c RUNCMD -- [arg [arg...]]"
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echo ""
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echo "SERVICENAME, RUNAS, RUNCMD, and POSTSTART can be set via the"
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echo "environment as well. Command line arguments will override"
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echo "environment variables."
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echo ""
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echo " -h Show help and exit"
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echo " -p Print the job file instead of writing to disk"
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echo " -s POSTSTART post_start will be added to the upstart job. Ignored with systemd."
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echo " default: $DEFAULT_POSTSTART"
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echo " -e ENV Environment name=value entries to set in the service/job"
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echo " -n SERVICENAME Name of job/service file."
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echo " -u RUNAS User to run main executable as."
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echo " -c RUNCMD Command to execute. Must stay in foreground."
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echo " arg... Arguments will be passed to COMMAND"
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echo ""
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}
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# Can be set in environment now
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SERVICENAME=${SERVICENAME:-""}
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RUNAS=${RUNAS:-""}
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RUNCMD=${RUNCMD:-""}
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ENV=${ENV:-""}
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# The default helps avoid race with daemon listening. http://pad.lv/1179766
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POSTSTART=${POSTSTART:-$DEFAULT_POSTSTART}
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print_only() {
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cat
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}
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print_to_file() {
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cat > $1
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}
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OUTPUT=print_to_file
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nshift=0
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while getopts "phs:n:u:c:e:" opt; do
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case "$opt" in
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n) SERVICENAME=$OPTARG;;
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u) RUNAS=$OPTARG;;
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c) RUNCMD=$OPTARG;;
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s) POSTSTART=$OPTARG;;
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e) ENV=$OPTARG;;
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p) OUTPUT=print_only;;
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h) usage; exit 0;;
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\?) usage; exit 1;;
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:) usage; exit 1;;
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esac
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done
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shift $(($OPTIND-1))
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if [ -z "$SERVICENAME" ] || [ -z "$RUNAS" ] || [ -z "$RUNCMD" ] ; then
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if [ $# -lt 3 ] ; then
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usage
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exit 1
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fi
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fi
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# Compatibility with old style passing w/o switches
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[ -n "$SERVICENAME" ] || { SERVICENAME=$1 ; shift; }
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[ -n "$RUNAS" ] || { RUNAS=$1 ; shift; }
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[ -n "$RUNCMD" ] || { RUNCMD=$1 ; shift; }
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function install_upstart {
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local name=$1
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local user=$2
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local cmd=$3
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shift; shift; shift
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local args=$*
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local env_entries=''
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if [ -n "$ENV" ]; then
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local env_pad=" $ENV"
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env_entries=${env_pad// /
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env }
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fi
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$OUTPUT /etc/init/$name.conf <<EOF
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start on runlevel [2345]
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stop on runlevel [016]
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$env_entries
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env OS_SVC_ENABLE_CONTROL=1
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pre-start script
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mkdir -p /var/run/$user
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chown -R $user:$user /var/run/$user
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end script
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respawn
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# the default post-start of 1 second sleep delays respawning enough to
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# not hit the default of 10 times in 5 seconds. Make it 2 times in 5s.
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respawn limit 2 5
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exec start-stop-daemon --start -c $user --exec /opt/stack/venvs/$user/bin/$cmd -- $args
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post-start $POSTSTART
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EOF
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}
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function install_systemd {
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local name=$1
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local user=$2
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local cmd=$3
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shift; shift; shift
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local args=$*
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local env_entries=''
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if [ -n "$ENV" ]; then
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local env_pad=" $ENV"
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env_entries=${env_pad// /
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Environment=}
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fi
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$OUTPUT /lib/systemd/system/$name.service <<EOF
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[Unit]
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Description=$name Service
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After=os-refresh-config.service
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Requires=$name-create-dir.service
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[Service]
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ExecStart=/opt/stack/venvs/$user/bin/$cmd $args
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User=$user
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$env_entries
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[Install]
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WantedBy=multi-user.target
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Alias=$name.service
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EOF
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$OUTPUT /lib/systemd/system/$name-create-dir.service <<EOF
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[Unit]
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Description=Create /var/run/$name
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[Service]
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ExecStartPre=/bin/mkdir -p /var/run/$user
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ExecStart=/bin/chown -R $user:$user /var/run/$user
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EOF
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}
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# TODO: SysV init fallback support
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DIB_INIT_SYSTEM=$(dib-init-system)
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if [ "$DIB_INIT_SYSTEM" == "upstart" ]; then
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install_upstart $SERVICENAME $RUNAS $RUNCMD $*
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elif [ "$DIB_INIT_SYSTEM" == "systemd" ]; then
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if [ "$POSTSTART" != "$DEFAULT_POSTSTART" ] ; then
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echo "WARNING: post start is ignored with systemd." >&2
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fi
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install_systemd $SERVICENAME $RUNAS $RUNCMD $*
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fi
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