140 lines
4.6 KiB
Bash
Executable File
140 lines
4.6 KiB
Bash
Executable File
#!/usr/bin/env bash
|
|
# SPDX-License-Identifier: MIT
|
|
#
|
|
# dmenu_run_systemd: start a program from dmenu as transient systemd .scope
|
|
# (C) Copyright Benjamin Block 2021
|
|
# (C) Copyright Daniel Olsen 2023
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a
|
|
# copy of this software and associated documentation files (the "Software"),
|
|
# to deal in the Software without restriction, including without limitation
|
|
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
# and/or sell copies of the Software, and to permit persons to whom the
|
|
# Software is furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice (including the next
|
|
# paragraph) shall be included in all copies or substantial portions of the
|
|
# Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
# DEALINGS IN THE SOFTWARE.
|
|
#
|
|
# Requirements:
|
|
# - Package: bash
|
|
# - Package: dmenu
|
|
# - dmenu_path
|
|
# - dmenu
|
|
# - Package: coreutils
|
|
# - basenc
|
|
# - tr
|
|
# - Package: systemd
|
|
# - systemd-run
|
|
# - Package: util-linux
|
|
# - getopt
|
|
#
|
|
# Usage: dmenu_run_systemd
|
|
#
|
|
# Start demnu to select program to execute, then start selected program in
|
|
# background.
|
|
#
|
|
# Usage: dmenu_run_systemd [Options] [--] <command> [<arg1>[, <arg2>[...]]]
|
|
#
|
|
# Start <command> with <arg1..N> without involving dmenu.
|
|
# E.g. in i3 config: `bindsym $mod+Return exec dmenu_run_systemd alacritty`.
|
|
#
|
|
# Options:
|
|
# -f, --forground Start <command> as forground task (default: no)
|
|
# -p, --pwd Use the current ${PWD} as working directory (default:
|
|
# ${HOME})
|
|
|
|
declare -g prefix forground=false cpwd=false
|
|
declare -ga selection
|
|
if [ "${#}" -lt 1 ]; then
|
|
prefix="dmenu-"
|
|
selection=("$(dmenu_path | dmenu)") || exit 127
|
|
else
|
|
prefix="xrun-"
|
|
|
|
declare opts
|
|
opts="$(getopt --shell bash \
|
|
-o "fp" \
|
|
-l "forground,pwd" \
|
|
-n "dmenu_run_systemd" -- "${@}")" || exit 122
|
|
eval set -- "${opts}"
|
|
unset opts
|
|
|
|
while true; do
|
|
case "${1}" in
|
|
'-f'|'--forground')
|
|
forground=true
|
|
;;
|
|
'-p'|'--pwd')
|
|
cpwd=true
|
|
;;
|
|
'--') shift; break;;
|
|
esac
|
|
shift
|
|
done
|
|
|
|
selection=("${@}")
|
|
fi
|
|
readonly selection prefix
|
|
|
|
declare -g name
|
|
# Max unit name length: 256
|
|
# - ".scope" - 6
|
|
# - "<prefix>-" - 6
|
|
# - "-<rand>" - 33
|
|
# ------
|
|
# "<name>" <= 211
|
|
read -r -d '' -n 192 name < <(
|
|
echo -n "${selection[*]}" | tr -c 'a-zA-Z0-9_-' '[_*]' || exit 1
|
|
echo -e '\0' || exit 2
|
|
) || exit 126
|
|
readonly name
|
|
{ [ "${#name}" -gt 0 ] && [ "${#name}" -le 211 ]; } || exit 125
|
|
|
|
declare -g rand
|
|
# ~5 bits per character => 32*5 = ~160 bits random number
|
|
read -r -N 32 rand < <(basenc --base32 < /dev/urandom) || exit 124
|
|
readonly rand
|
|
[ "${#rand}" -eq 32 ] || exit 123
|
|
|
|
declare -ga runargs=(
|
|
--quiet
|
|
--user # run in per-User slice
|
|
--scope # create transient `.scope` unit,
|
|
# instead of `.service`
|
|
--collect # garbage collect everything after run,
|
|
# even on failure
|
|
--slice="app.slice" # run as part of `app.slice`
|
|
--unit="${prefix}${name}-${rand}"
|
|
|
|
-p MemoryHigh=92%
|
|
-p MemoryMax=98%
|
|
# unit name
|
|
--description="dmenu selection ${selection[*]@Q}"
|
|
)
|
|
|
|
if ${cpwd}; then
|
|
runargs+=( --working-directory="${PWD:-/}" )
|
|
else
|
|
runargs+=( --working-directory="${HOME:-/}" )
|
|
fi
|
|
|
|
readonly runargs
|
|
|
|
## Debugging:
|
|
#declare -p prefix selection name rand runargs
|
|
|
|
if ${forground}; then
|
|
systemd-run "${runargs[@]}" -- "${selection[@]}"
|
|
else
|
|
systemd-run "${runargs[@]}" -- "${selection[@]}" &
|
|
fi
|