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tools: retain sanity when reloading under systemd

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Without this, we end up restarting watchfrr with the systemd watchdog
non-functional & tripped a bit later.  Also, if watchfrr is in the
"control" cgroup, systemd 232 will kill it.  (241 apparently doesn't.
Can't find anything about this in systemd's ChangeLog though.)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2019-06-10 01:35:04 +02:00
parent 11ce13decb
commit 9c251d376a
1 changed files with 25 additions and 0 deletions
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25
tools/frrinit.sh.in
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@ -71,6 +71,16 @@ reload)
exit 1
fi
# systemd doesn't set WATCHDOG_USEC for reload commands.
watchfrr_pidfile="$V_PATH/watchfrr.pid"
watchfrr_pid="`cat \"$watchfrr_pidfile\"`"
if [ -d "/proc/$watchfrr_pid" ]; then
wdt="`tr '\0' '\n' < /proc/$watchfrr_pid/environ | grep '^WATCHDOG_USEC='`"
wdt="${wdt#WATCHDOG_USEC=}"
[ -n "$wdt" ] && : ${WATCHDOG_USEC:=$wdt}
[ -n "$WATCHDOG_USEC" ] && export WATCHDOG_USEC
fi
# restart watchfrr to pick up added daemons.
# NB: This will NOT cause the other daemons to be restarted.
daemon_list daemons
@ -78,6 +88,21 @@ reload)
daemon_stop watchfrr && \
daemon_start watchfrr
# make systemd not kill watchfrr after ExecReload completes
# 3 goats were sacrificed to restore sanity after coding this
watchfrr_pid="`cat \"$watchfrr_pidfile\"`"
if [ -f "/proc/$watchfrr_pid/cgroup" -a -d "/sys/fs/cgroup/systemd" ]; then
cg="`egrep '^[0-9]+:name=systemd:' \"/proc/$watchfrr_pid/cgroup\"`"
cg="${cg#*:*:}"
cgmain="$cg"
cgmain="${cgmain%/.control}"
cgmain="${cgmain%/control}"
[ -n "$cg" -a "$cg" != "$cgmain" ] && \
echo "$watchfrr_pid" > "/sys/fs/cgroup/systemd/$cgmain/tasks"
fi
NEW_CONFIG_FILE="${2:-$C_PATH/frr.conf}"
[ ! -r $NEW_CONFIG_FILE ] && log_failure_msg "Unable to read new configuration file $NEW_CONFIG_FILE" && exit 1
"$RELOAD_SCRIPT" --reload "$NEW_CONFIG_FILE"