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#!/bin/sh
# Bundled with UWSM, but is independent of it.
# https://github.com/Vladimir-csp/uwsm
# https://gitlab.freedesktop.org/Vladimir-csp/uwsm
# NOTE: this is a hack to locally prop up applications that do not properly
# wait for tray themselves, but should.
#
# Put it into `ExecStartPre=-` of the autostart unit or make it a part of a
# wrapper to delay application startup until tray is available or timeout is
# reached. Positional arguments: [TIMEOUT_SECONDS [DELAY_SECONDS]]
#
# This is not a part of any standard mechanism nor it should be, because there
# is no standard. Other custom mechanisms exist, i.e NixOS's `tray.target`, but
# nothing of sorts should be encouraged.
#
# If you find yourself in need of putting this script to use, consider filing a
# bug report for the culprit app.
set -e
wait_tray() {
# Run busctl monitor in background, save pid to $MON_PID.
# It will exit when any of tray dbus services' owner changes from
# nothing to something.
# wrap tray service names with dbus match args
set --
for arg in $TRAY_NAMES; do
# shellcheck disable=SC2089
set -- "$@" --match "type='signal',member='NameOwnerChanged',path='/org/freedesktop/DBus',arg0='${arg}',arg1=''"
done
# watch for message
busctl --user monitor \
--json=short \
--no-pager \
--no-legend \
"$@" \
--limit-messages 1 \
--timeout "${TIMEOUT}s" \
> /dev/null 2>&1 &
MON_PID=$!
}
check_tray() {
# return 0 if any of tray serivces is active
for service in $TRAY_NAMES; do
if busctl --user status "$service" --no-pager --no-legend > /dev/null 2>&1; then
return 0
fi
done
return 1
}
# shellcheck disable=SC2329
trapterm() {
# cancel trap to make it single-use
trap - INT TERM HUP EXIT
# suppress stderr, including "Terminated" message
exec 2> /dev/null
kill "$MON_PID" || true
wait "$MON_PID" || true
}
delay() {
if [ "$DELAY" -gt "0" ]; then
printf '%s\n' "Delaying for $DELAY seconds"
sleep "$DELAY"
fi
}
usage() {
printf '%s\n' "Usage: ${0##*/} [TIMEOUT_SECONDS [DELAY_SECONDS]]"
}
########
TRAY_NAMES="org.kde.StatusNotifierWatcher org.freedesktop.StatusNotifierWatcher"
TIMEOUT=${1:-30}
DELAY=${2:-0}
case " $* " in
*' -h '* | *' --help '*)
usage
exit 0
;;
esac
case "$TIMEOUT" in
*[!0-9]*)
{
printf '%s\n' "Expected number of seconds as timeout, got: $TIMEOUT"
usage
} >&2
exit 1
;;
esac
case "$DELAY" in
*[!0-9]*)
{
printf '%s\n' "Expected number of seconds as delay, got: $DELAY"
usage
} >&2
exit 1
;;
esac
## start busctl monitor in background
wait_tray
## set cleanup trap
trap trapterm INT TERM HUP EXIT
## check current state and exit on success
if check_tray; then
printf '%s\n' "Tray is active"
delay
exit 0
fi
printf '%s\n' "Waiting $TIMEOUT seconds for Tray to activate..."
wait "$MON_PID" || true
# recheck current status
if check_tray; then
printf '%s\n' "Tray is active"
delay
exit 0
else
RC=$?
printf '%s\n' "Tray failed to activate!" >&2
exit "$RC"
fi
|
