141 lines
4.6 KiB
Bash
Executable File
141 lines
4.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: MIT
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#
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# dmenu_run_systemd: start a program from dmenu as transient systemd .scope
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# (C) Copyright Benjamin Block 2021
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# (C) Copyright Daniel Olsen 2023
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the "Software"),
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# to deal in the Software without restriction, including without limitation
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# the rights to use, copy, modify, merge, publish, distribute, sublicense,
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# and/or sell copies of the Software, and to permit persons to whom the
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# Software is furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice (including the next
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# paragraph) shall be included in all copies or substantial portions of the
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# Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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# DEALINGS IN THE SOFTWARE.
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#
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# Requirements:
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# - Package: bash
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# - Package: dmenu
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# - dmenu_path
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# - dmenu
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# - Package: coreutils
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# - basenc
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# - tr
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# - Package: systemd
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# - systemd-run
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# - Package: util-linux
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# - getopt
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#
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# Usage: dmenu_run_systemd
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#
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# Start demnu to select program to execute, then start selected program in
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# background.
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#
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# Usage: dmenu_run_systemd [Options] [--] <command> [<arg1>[, <arg2>[...]]]
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#
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# Start <command> with <arg1..N> without involving dmenu.
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# E.g. in i3 config: `bindsym $mod+Return exec dmenu_run_systemd alacritty`.
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#
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# Options:
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# -f, --forground Start <command> as forground task (default: no)
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# -p, --pwd Use the current ${PWD} as working directory (default:
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# ${HOME})
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declare -g prefix forground=false cpwd=false
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declare -ga selection
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if [ "${#}" -lt 1 ]; then
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prefix="dmenu-"
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selection=("$(dmenu_path | dmenu)") || exit 127
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else
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prefix="xrun-"
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declare opts
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opts="$(getopt --shell bash \
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-o "fp" \
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-l "forground,pwd" \
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-n "dmenu_run_systemd" -- "${@}")" || exit 122
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eval set -- "${opts}"
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unset opts
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while true; do
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case "${1}" in
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'-f'|'--forground')
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forground=true
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;;
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'-p'|'--pwd')
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cpwd=true
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;;
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'--') shift; break;;
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esac
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shift
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done
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selection=("${@}")
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fi
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readonly selection prefix
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declare -g name
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# Max unit name length: 256
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# - ".scope" - 6
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# - "<prefix>-" - 6
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# - "-<rand>" - 33
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# ------
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# "<name>" <= 211
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read -r -d '' -n 192 name < <(
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echo -n "${selection[*]}" | tr -c 'a-zA-Z0-9_-' '[_*]' || exit 1
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echo -e '\0' || exit 2
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) || exit 126
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readonly name
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{ [ "${#name}" -gt 0 ] && [ "${#name}" -le 211 ]; } || exit 125
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declare -g rand
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# ~5 bits per character => 32*5 = ~160 bits random number
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read -r -N 32 rand < <(basenc --base32 < /dev/urandom) || exit 124
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readonly rand
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[ "${#rand}" -eq 32 ] || exit 123
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declare -ga runargs=(
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--quiet
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--user # run in per-User slice
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--scope # create transient `.scope` unit,
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# instead of `.service`
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--collect # garbage collect everything after run,
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# even on failure
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--slice="app.slice" # run as part of `app.slice`
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--unit="${prefix}${name}-${rand}"
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-p MemoryHigh=85%
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-p MemoryMax=92%
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-p MemorySwapMax=5G
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# unit name
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--description="dmenu selection ${selection[*]@Q}"
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)
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if ${cpwd}; then
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runargs+=( --working-directory="${PWD:-/}" )
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else
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runargs+=( --working-directory="${HOME:-/}" )
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fi
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readonly runargs
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## Debugging:
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#declare -p prefix selection name rand runargs
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if ${forground}; then
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systemd-run "${runargs[@]}" -- "${selection[@]}"
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else
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systemd-run "${runargs[@]}" -- "${selection[@]}" &
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fi
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