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c3ecb747f1
Otherwise, with recent additions, the MAINPIDFDID= generated by systemd-notify would mismatch with overridden MAINPID=.
75 lines
1.7 KiB
Bash
Executable File
75 lines
1.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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# shellcheck disable=SC2016
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set -eux
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set -o pipefail
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sync_in() {
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read -r x < /tmp/syncfifo2
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test "$x" = "$1"
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}
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sync_out() {
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echo "$1" > /tmp/syncfifo1
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}
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export SYSTEMD_LOG_LEVEL=debug
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echo "toplevel PID: $BASHPID"
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systemd-notify --status="Test starts"
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sync_out a
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sync_in b
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(
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echo "subshell PID: $BASHPID"
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# Make us main process
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systemd-notify --pid="$BASHPID"
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# Lock down access to just us
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systemd-notify "NOTIFYACCESS=main"
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# This should still work
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systemd-notify --status="Sending READY=1 in an unprivileged process"
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# Send as subprocess of the subshell, this should not work
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systemd-notify --ready --pid=self --status "BOGUS1"
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sync_out c
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sync_in d
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# Move main process back to toplevel
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systemd-notify "MAINPID=$$"
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# Should be dropped again
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systemd-notify --status="BOGUS2" --pid=parent
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# Apparently, bash will automatically invoke the last command in a subshell
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# via a simple execve() rather than fork()ing first. But we want that the
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# previous command uses the subshell's PID, hence let's insert a final,
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# bogus redundant command as last command to run in the subshell, so that
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# bash can't optimize things like that.
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echo "bye"
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)
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echo "toplevel again: $BASHPID"
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systemd-notify --ready
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systemd-notify "ERRNO=1" "BUSERROR=org.freedesktop.DBus.Error.InvalidArgs" "VARLINKERROR=org.varlink.service.InvalidParameter"
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sync_out e
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sync_in f
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systemd-notify "ERRNO=bogus" "BUSERROR=草wwww" "VARLINKERROR=systemköttel"
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sync_out g
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sync_in h
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systemd-notify --status="OK"
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systemd-notify "NOTIFYACCESS=none"
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systemd-notify --status="BOGUS3"
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sync_out i
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exec sleep infinity
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