Rasmus Villemoes
10a356629a
The %.20d specifier was introduced in 2d738a0aee ("profile/systemd-osc-context:
Enforce length limits"). But, for numeric conversions, the precision is not an
upper bound, but rather a lower bound on the output width, padding as necessary
with 0 on the left. So as-is, this does not in fact limit the output to at most
20 characters.
Of course, in practice, pids on linux are never greater than 2^22, and
certainly never larger than what would fit in a 20-digit decimal. On the other
hand, that more or less guarantees that the pid= field is always emitted with
12+ leadings zeroes, which is a bit silly. Moreover, a leading 0 can cause a
parser to treat it as octal.
Since $$ does expand to the PID in decimal, just print that as a string, with the
enforced 20 character limit.
102 lines
4.3 KiB
Bash
102 lines
4.3 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. We'll only do it where it's
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# strictly necessary, and skip it when processing strings we are pretty
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# sure we won't need it for, such as uuids, id128, hostnames, usernames,
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# since they all come with syntax requirements that exclude \ and ;
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# anyway. This hence primarily is about escaping the current working
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# directory.
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local systemd_value="$1"
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systemd_value="${systemd_value//\\/\\x5c}"
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systemd_value="${systemd_value//;/\\x3b}"
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systemd_value="${systemd_value//[[:cntrl:]]/⍰}"
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printf "%s" "$systemd_value"
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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=%.20s" "$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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