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kdumpctl: force rebuild in case of watchdog state change

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If state of a watchdog device is changed by an user after kdumpctl restart
then initramfs must be rebuilt on the basis of new watchdog status.

Testing:
-------------------------------------------------------
Initramfs	wdt state
		Prev	Current		Result
-------------------------------------------------------
Not Exist	NA	X		Rebuild
Exist		Inact	Inact		No Rebuild
Exist		Inact	Act		Force Rebuild
Exist		Act	Inact		Force Rebuild
Exist		Act	Act(Same wdt)	No Rebuild
Exist		Act	Act(Diff wdt)	Force Rebuild
Exist		Act	Module Removed	Force Rebuild

Signed-off-by: Pratyush Anand <panand@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Pratyush Anand 2016-07-20 23:42:21 +05:30 committed by Dave Young
parent 3095c3741f
commit 6a2b39b96e
1 changed files with 40 additions and 0 deletions
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kdumpctl
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@ -427,6 +427,40 @@ check_dump_fs_modified()
return 1
}
check_wdt_modified()
{
is_wdt_mod_omitted
[[ $? -eq 0 ]] && return 0
[[ -d /sys/class/watchdog/ ]] || return 0
for dir in /sys/class/watchdog/*; do
[[ -d "$dir" ]] || continue
[[ -f "$dir/state" ]] || continue
wdtdrv=$(< "$dir/device/modalias")
wdtdrv=$(modinfo $wdtdrv | grep filename | awk -F"kernel/" '{print $2}')
active=$(< "$dir/state")
# rebuild when:
# module for this watchdog is not found and watchdog is active
# module for this watchdog is found and watchdog is inactive
lsinitrd $TARGET_INITRD | grep $wdtdrv &> /dev/null
if [ $? -ne 0 ]; then
[[ "$active" = "active" ]] && return 1
else
[[ "$active" = "inactive" ]] && return 1
fi
done
# check if watchdog kernel module unloaded.
loaded_mods=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)
[[ -n $loaded_mods ]] && loaded_mods=$(echo $loaded_mods | awk -F"rd.driver.pre=" '{print $2}' | sed "s/,/ /g")
for mod in $loaded_mods ; do
lsmod | grep $mod &> /dev/null
[[ $? != 0 ]] && return 1
done
return 0
}
# returns 0 if system is not modified
# returns 1 if system is modified
# returns 2 if system modification is invalid
@ -448,6 +482,12 @@ check_system_modified()
return $ret
fi
check_wdt_modified
if [ $? -ne 0 ]; then
echo "Detected change in watchdog state"
return 1
fi
return 0
}