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yunohost/data/helpers.d/systemd

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#!/bin/bash
# Create a dedicated systemd config
#
# usage: ynh_add_systemd_config [--service=service] [--template=template]
# usage: ynh_add_systemd_config [--service=service] [--template=template] [--others_var="list of others variables to replace"]
# | arg: -s, --service= - Service name (optionnal, $app by default)
# | arg: -t, --template= - Name of template file (optionnal, this is 'systemd' by default, meaning ./conf/systemd.service will be used as template)
# | arg: -v, --others_var= - List of others variables to replace separated by a space. For example: 'var_1 var_2 ...'
#
# This will use the template ../conf/<templatename>.service
# to generate a systemd config, by replacing the following keywords
# with global variables that should be defined before calling
# this helper :
#
# __APP__ by $app
# __FINALPATH__ by $final_path
#
# And dynamic variables (from the last example) :
# __VAR_1__ by $var_1
# __VAR_2__ by $var_2
#
# Requires YunoHost version 2.7.11 or higher.
ynh_add_systemd_config () {
# Declare an array to define the options of this helper.
local legacy_args=stv
local -A args_array=( [s]=service= [t]=template= [v]=others_var= )
local service
local template
local others_var
# Manage arguments with getopts
ynh_handle_getopts_args "$@"
local service="${service:-$app}"
local template="${template:-systemd.service}"
others_var="${others_var:-}"
finalsystemdconf="/etc/systemd/system/$service.service"
ynh_backup_if_checksum_is_different --file="$finalsystemdconf"
cp ../conf/$template "$finalsystemdconf"
# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
# Substitute in a nginx config file only if the variable is not empty
if [ -n "${final_path:-}" ]; then
ynh_replace_string --match_string="__FINALPATH__" --replace_string="$final_path" --target_file="$finalsystemdconf"
fi
if [ -n "${app:-}" ]; then
ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$finalsystemdconf"
fi
# Replace all other variables given as arguments
for var_to_replace in $others_var
do
# ${var_to_replace^^} make the content of the variable on upper-cases
# ${!var_to_replace} get the content of the variable named $var_to_replace
ynh_replace_string --match_string="__${var_to_replace^^}__" --replace_string="${!var_to_replace}" --target_file="$finalsystemdconf"
done
ynh_store_file_checksum --file="$finalsystemdconf"
chown root: "$finalsystemdconf"
systemctl enable $service --quiet
systemctl daemon-reload
}
# Remove the dedicated systemd config
#
# usage: ynh_remove_systemd_config [--service=service]
# | arg: -s, --service= - Service name (optionnal, $app by default)
#
# Requires YunoHost version 2.7.2 or higher.
ynh_remove_systemd_config () {
# Declare an array to define the options of this helper.
local legacy_args=s
local -A args_array=( [s]=service= )
local service
# Manage arguments with getopts
ynh_handle_getopts_args "$@"
local service="${service:-$app}"
local finalsystemdconf="/etc/systemd/system/$service.service"
if [ -e "$finalsystemdconf" ]
then
ynh_systemd_action --service_name=$service --action=stop
systemctl disable $service --quiet
ynh_secure_remove --file="$finalsystemdconf"
systemctl daemon-reload
fi
}
# Start (or other actions) a service, print a log in case of failure and optionnaly wait until the service is completely started
#
# usage: ynh_systemd_action [--service_name=service_name] [--action=action] [ [--line_match="line to match"] [--log_path=log_path] [--timeout=300] [--length=20] ]
# | arg: -n, --service_name= - Name of the service to start. Default : $app
# | arg: -a, --action= - Action to perform with systemctl. Default: start
# | arg: -l, --line_match= - Line to match - The line to find in the log to attest the service have finished to boot. If not defined it don't wait until the service is completely started. WARNING: When using --line_match, you should always add `ynh_clean_check_starting` into your `ynh_clean_setup` at the beginning of the script. Otherwise, tail will not stop in case of failure of the script. The script will then hang forever.
# | arg: -p, --log_path= - Log file - Path to the log file. Default : /var/log/$app/$app.log
# | arg: -t, --timeout= - Timeout - The maximum time to wait before ending the watching. Default : 300 seconds.
# | arg: -e, --length= - Length of the error log : Default : 20
#
# Requires YunoHost version 3.5.0 or higher.
ynh_systemd_action() {
# Declare an array to define the options of this helper.
local legacy_args=nalpte
local -A args_array=( [n]=service_name= [a]=action= [l]=line_match= [p]=log_path= [t]=timeout= [e]=length= )
local service_name
local action
local line_match
local length
local log_path
local timeout
# Manage arguments with getopts
ynh_handle_getopts_args "$@"
service_name="${service_name:-$app}"
action=${action:-start}
line_match=${line_match:-}
length=${length:-20}
log_path="${log_path:-/var/log/$service_name/$service_name.log}"
timeout=${timeout:-300}
# Start to read the log
if [[ -n "$line_match" ]]
then
local templog="$(mktemp)"
# Following the starting of the app in its log
if [ "$log_path" == "systemd" ]
then
# Read the systemd journal
journalctl --unit=$service_name --follow --since=-0 --quiet > "$templog" &
# Get the PID of the journalctl command
local pid_tail=$!
else
# Read the specified log file
tail --follow=name --retry --lines=0 "$log_path" > "$templog" 2>&1 &
# Get the PID of the tail command
local pid_tail=$!
fi
fi
# Use reload-or-restart instead of reload. So it wouldn't fail if the service isn't running.
if [ "$action" == "reload" ]; then
action="reload-or-restart"
fi
# If the service fails to perform the action
if ! systemctl $action $service_name
then
# Show syslog for this service
ynh_exec_err journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name
# If a log is specified for this service, show also the content of this log
if [ -e "$log_path" ]
then
ynh_print_err --message="--"
ynh_exec_err tail --lines=$length "$log_path"
fi
# Fail the app script, since the service failed.
ynh_die
fi
# Start the timeout and try to find line_match
if [[ -n "${line_match:-}" ]]
then
local i=0
for i in $(seq 1 $timeout)
do
# Read the log until the sentence is found, that means the app finished to start. Or run until the timeout
if grep --extended-regexp --quiet "$line_match" "$templog"
then
ynh_print_info --message="The service $service_name has correctly executed the action ${action}."
break
fi
if [ $i -eq 3 ]; then
echo -n "Please wait, the service $service_name is ${action}ing" >&2
fi
if [ $i -ge 3 ]; then
echo -n "." >&2
fi
sleep 1
done
if [ $i -ge 3 ]; then
echo "" >&2
fi
if [ $i -eq $timeout ]
then
ynh_print_warn --message="The service $service_name didn't fully executed the action ${action} before the timeout."
ynh_print_warn --message="Please find here an extract of the end of the log of the service $service_name:"
ynh_exec_warn journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service_name
if [ -e "$log_path" ]
then
ynh_print_warn --message="\-\-\-"
ynh_exec_warn tail --lines=$length "$log_path"
fi
fi
ynh_clean_check_starting
fi
}
# Clean temporary process and file used by ynh_check_starting
# (usually used in ynh_clean_setup scripts)
#
# usage: ynh_clean_check_starting
#
# Requires YunoHost version 3.5.0 or higher.
ynh_clean_check_starting () {
if [ -n "$pid_tail" ]
then
# Stop the execution of tail.
kill -SIGTERM $pid_tail 2>&1
fi
if [ -n "$templog" ]
then
ynh_secure_remove "$templog" 2>&1
fi
}
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