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https://github.com/clash-verge-rev/clash-verge-rev.git
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TungliesandCopilot
3ca0c27a8e
Reinstall a Service removed by a previous prerm only when the old prerm uninstalls unconditionally, this dpkg run completed a stop job for it, and its group comes from that same invocation's stdout journal entries. Hand the evidence to the postinst through a single-use file tied to the old version and cleared by every preinst. Refs #8515 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
50 lines
2.5 KiB
Bash
50 lines
2.5 KiB
Bash
#!/bin/bash
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# Previous packages' prerm uninstalls the Service before this script runs, deleting the unit that names
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# its group. The journal still shows whether this dpkg run stopped a running Service and which group that
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# invocation ran with; the postinst reinstalls only from that evidence.
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SERVICE_UNIT="clash-verge-service.service"
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UPGRADE_EVIDENCE="/run/clash-verge-service-upgrade-evidence"
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# systemd's "unit stopped" catalog entry; restart jobs share it, so JOB_TYPE is required too.
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UNIT_STOPPED_MESSAGE_ID="9d1aaa27d60140bd96365438aad20286"
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dpkg_start_epoch() {
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local stat start btime ticks
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read -r stat <"/proc/$PPID/stat" || return 1
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start="$(printf '%s\n' "${stat##*) }" | cut -d' ' -f20)"
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btime="$(sed -n 's/^btime //p' /proc/stat)"
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ticks="$(getconf CLK_TCK)"
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[ -n "$start" ] && [ -n "$btime" ] && [ -n "$ticks" ] || return 1
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echo $((btime + start / ticks))
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}
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# Only a prerm that uninstalls on every invocation explains a missing unit during an upgrade.
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old_prerm_uninstalls() {
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local prerm="${DPKG_ADMINDIR:-/var/lib/dpkg}/info/$DPKG_MAINTSCRIPT_PACKAGE.prerm"
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[ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] && [ -f "$prerm" ] &&
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grep -qx '/usr/bin/clash-verge-service-uninstall' "$prerm" && ! grep -q 'upgrade' "$prerm"
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}
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rm -f "$UPGRADE_EVIDENCE"
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if [ "$1" = "upgrade" ] && [ -n "$2" ] && [ ! -e "/etc/systemd/system/$SERVICE_UNIT" ] &&
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[ -d /run/systemd/system ] && [ "$(cat "/proc/$PPID/comm" 2>/dev/null)" = "dpkg" ] &&
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command -v journalctl >/dev/null && old_prerm_uninstalls; then
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since="$(dpkg_start_epoch)"
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invocation=""
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if [ -n "$since" ]; then
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invocation="$(journalctl -q --no-pager --since "@$since" _PID=1 UNIT="$SERVICE_UNIT" \
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MESSAGE_ID="$UNIT_STOPPED_MESSAGE_ID" JOB_TYPE=stop JOB_RESULT=done -n 1 -o export 2>/dev/null |
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sed -n 's/^INVOCATION_ID=//p')"
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fi
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if printf '%s' "$invocation" | grep -qx '[0-9a-f]\{32\}'; then
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# Stdout entries carry the credentials systemd connected the stream with, which are the unit's Group=.
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gid="$(journalctl -q --no-pager _SYSTEMD_INVOCATION_ID="$invocation" _SYSTEMD_UNIT="$SERVICE_UNIT" \
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_TRANSPORT=stdout -n 1 -o export 2>/dev/null | sed -n 's/^_GID=//p')"
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if [ -z "$gid" ] || [ "$gid" = "0" ] || ! getent group "$gid" >/dev/null; then
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gid=""
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fi
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echo "Clash Verge Service invocation $invocation was removed by the previous package; it will be reinstalled."
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(umask 022 && printf 'old=%s\ngid=%s\n' "$2" "$gid" >"$UPGRADE_EVIDENCE")
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fi
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fi
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exit 0
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