Zbigniew Jędrzejewski-Szmek
5991f0b861
This was requested in https://github.com/systemd/systemd/issues/42333. Indeed, this integration is using three levels of systemd magick, so doing this correctly is not obvious. Let's include specific instructions to help people for whom this integration is causing problems.
98 lines
4.2 KiB
Bash
98 lines
4.2 KiB
Bash
# SPDX-License-Identifier: LGPL-2.1-or-later
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# shellcheck shell=bash
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# shellcheck disable=SC2016
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# shellcheck disable=SC1003
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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# This implements the UAPI.15 "OSC 3008: Hierarchical Context Signalling"
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# specification for the shell prompt. For details see:
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# https://uapi-group.org/specifications/specs/osc_context/
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# This file is "activated" through systemd-tmpfiles which links it into
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# /etc/profile.d/. To disable this, remove the
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# /etc/profile.d/80-systemd-osc-context.sh symlink and mask the
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# 20-systemd-osc-context.conf snippet (as root):
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#
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# test -h /etc/profile.d/80-systemd-osc-context.sh && \
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# rm -v /etc/profile.d/80-systemd-osc-context.sh && \
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# ln -s /dev/null /etc/tmpfiles.d/20-systemd-osc-context.conf
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# Not bash?
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[ -n "${BASH_VERSION:-}" ] || return 0
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# If we're on a "dumb" terminal, do not install the prompt.
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# Treat missing $TERM same as "dumb".
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[ "${TERM:-dumb}" = "dumb" ] && return 0
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# We need promptvars, otherwise the prompt strings won't undergo parameter expansion
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# and we'd print them literally
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shopt -q promptvars || return 0
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__systemd_osc_context_escape() {
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# Escape according to the OSC 3008 spec. Since this requires shelling out
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# to 'sed' we'll only do it where it's strictly necessary, and skip it when
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# processing strings we are pretty sure we won't need it for, such as
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# uuids, id128, hostnames, usernames, since they all come with syntax
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# requirements that exclude \ and ; anyway. This hence primarily is about
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# escaping the current working directory.
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echo "$1" | sed -e 's/\\/\\x5c/g' -e 's/;/\\x3b/g' -e 's/[[:cntrl:]]/⍰/g'
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}
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__systemd_osc_context_common() {
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if [ -f /etc/machine-id ]; then
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printf ";machineid=%.36s" "$(</etc/machine-id)"
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fi
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printf ";user=%.255s;hostname=%.255s;bootid=%.36s;pid=%.20d" "$USER" "$HOSTNAME" "$(</proc/sys/kernel/random/boot_id)" "$$"
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}
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__systemd_osc_context_precmdline() {
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local systemd_exitstatus="$?" systemd_signal
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# Close previous command
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if [ -n "${systemd_osc_context_cmd_id:-}" ]; then
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if [ "$systemd_exitstatus" -gt 128 ] && systemd_signal=$(kill -l "$systemd_exitstatus" 2>&-); then
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printf "\033]3008;end=%.64s;exit=failure;status=%d;signal=SIG%s\033\\" "$systemd_osc_context_cmd_id" "$systemd_exitstatus" "$systemd_signal"
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elif [ "$systemd_exitstatus" -ne 0 ]; then
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printf "\033]3008;end=%.64s;exit=failure;status=%d\033\\" "$systemd_osc_context_cmd_id" $((systemd_exitstatus))
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else
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printf "\033]3008;end=%.64s;exit=success\033\\" "$systemd_osc_context_cmd_id"
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fi
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fi
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# Prepare a context ID for this shell if we have none
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if [ -z "${systemd_osc_context_shell_id:-}" ]; then
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read -r systemd_osc_context_shell_id </proc/sys/kernel/random/uuid
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fi
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# Create or update the shell session
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printf "\033]3008;start=%.64s%s;type=shell;cwd=%.255s\033\\" "$systemd_osc_context_shell_id" "$(__systemd_osc_context_common)" "$(__systemd_osc_context_escape "$PWD")"
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# Prepare cmd id for next command
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read -r systemd_osc_context_cmd_id </proc/sys/kernel/random/uuid
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}
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__systemd_osc_context_ps0() {
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# Skip if PROMPT_COMMAND= is cleared manually or by other profiles.
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[ -n "${systemd_osc_context_cmd_id:-}" ] || return
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printf "\033]3008;start=%.64s%s;type=command;cwd=%.255s\033\\" "$systemd_osc_context_cmd_id" "$(__systemd_osc_context_common)" "$(__systemd_osc_context_escape "$PWD")"
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}
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if [ -n "${BASH_VERSION:-}" ]; then
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# Legacy bashrc will assign PROMPT_COMMAND=, which is equivalent to assigning
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# index 0 in the array. Leave an empty spot to handle this gracefully.
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[ -n "$(declare -p PROMPT_COMMAND 2>/dev/null)" ] || PROMPT_COMMAND+=('')
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# Whenever a new prompt is shown, close the previous command, and prepare new command
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PROMPT_COMMAND+=(__systemd_osc_context_precmdline)
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# PS0 is shown right after a prompt completed, but before the command is executed
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PS0='$(__systemd_osc_context_ps0)'"${PS0:-}"
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fi
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