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48 lines
1.2 KiB
Bash
Executable File
48 lines
1.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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set -eux
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set -o pipefail
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PINNED="$1"
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COUNTER="/tmp/fdstore-invoked.$PINNED"
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FILE="/tmp/fdstore-data.$PINNED"
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# This script is called six times: thrice from a service unit where the fdstore
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# is pinned, and thrice where it isn't. The second iteration of each series is
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# a restart, the third a stop followed by a start
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if [ -e "$COUNTER" ] ; then
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read -r N < "$COUNTER"
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else
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N=0
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fi
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echo "Invocation #$N with PINNED=$PINNED."
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if [ "$N" -eq 0 ] ; then
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# First iteration
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test "${LISTEN_FDS:-0}" -eq 0
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test ! -e "$FILE"
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echo waldi > "$FILE"
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systemd-notify --fd=3 --fdname="fd-$N-$PINNED" 3< "$FILE"
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elif [ "$N" -eq 1 ] || { [ "$N" -eq 2 ] && [ "$PINNED" -eq 1 ]; } ; then
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# Second iteration, or iteration with pinning on
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test "${LISTEN_FDS:-0}" -eq 1
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# We reopen fd #3 here, so that the read offset is at zero each time (hence no <&3 here…)
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read -r word < /proc/self/fd/3
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test "$word" = "waldi"
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else
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test "${LISTEN_FDS:-0}" -eq 0
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test -e "$FILE"
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fi
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if [ "$N" -ge 2 ] ; then
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rm "$COUNTER" "$FILE"
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else
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echo $((N + 1)) > "$COUNTER"
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fi
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systemd-notify --ready --status="Ready"
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exec sleep infinity
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