[systemd-devel] problem with service that uses bash loop

[Michał Piotrowski]

W dniu 29 marca 2011 21:15 użytkownik Michał Piotrowski
<mkkp4x4 at gmail.com> napisał:
> W dniu 29 marca 2011 21:07 użytkownik Lennart Poettering
> <lennart at poettering.net> napisał:
>> On Tue, 29.03.11 21:06, Michał Piotrowski (mkkp4x4 at gmail.com) wrote:
>>
>>> >> [Install]
>>> >> WantedBy=multi-user.target
>>> >>
>>> >> It works well until I add
>>> >> ExecStop=/bin/bash -c "for module in $HWMON_MODULES $BUS_MODULES; do
>>> >> /sbin/modprobe -r $module >/dev/null 2>&1; done"
>>> >>
>>> >> Is there some magical way in which I can make a simple loop in
>>> >> ExecStop?
>>> >
>>> > Hmm, are you suggesting that this works in ExecStart but not in
>>> > ExecStop? That would be a bug.
>>>
>>> I tried
>>> ExecStop=-/sbin/modprobe -qabr $BUS_MODULES $HWMON_MODULES
>>> too and also does not work.
>>
>> What precisely fails? Is the command line not properly constructed? Do
>> you have any further hints?
>
> Hmm... strange
>
> loaded modules
>
> Module                  Size  Used by
> ecryptfs               86341  1
> i2c_i801                9213  0
> serio_raw               4426  0
> iTCO_wdt               11480  0
> iTCO_vendor_support     2634  1 iTCO_wdt
> r8169                  35525  0
> mii                     4318  1 r8169
> ipv6                  282007  77
> sata_sil                8104  0
> i915                  346255  0
> drm_kms_helper         27243  1 i915
> drm                   187712  2 i915,drm_kms_helper
> i2c_algo_bit            4950  1 i915
> i2c_core               25468  5 i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
> video                  12432  1 i915
>
>
> I start this script
>
> [Unit]
> Description=lm_sensors for monitoring motherboard sensor values
> After=syslog.target
>
> [Service]
> EnvironmentFile=/etc/sysconfig/lm_sensors
> Type=oneshot
> ExecStart=-/sbin/modprobe -qab $BUS_MODULES $HWMON_MODULES
> ExecStart=/usr/bin/sensors -s
> #ExecStop=-/sbin/modprobe -qabr $BUS_MODULES $HWMON_MODULES
>
> [Install]
> WantedBy=multi-user.target
>
> Now I've got
>
> Module                  Size  Used by
> smsc47m192             12267  0
> hwmon_vid               2171  1 smsc47m192
> coretemp                5771  0
> ecryptfs               86341  1
> i2c_i801                9213  0
> serio_raw               4426  0
> iTCO_wdt               11480  0
> iTCO_vendor_support     2634  1 iTCO_wdt
> r8169                  35525  0
> mii                     4318  1 r8169
> ipv6                  282007  77
> sata_sil                8104  0
> i915                  346255  0
> drm_kms_helper         27243  1 i915
> drm                   187712  2 i915,drm_kms_helper
> i2c_algo_bit            4950  1 i915
> i2c_core               25468  6
> smsc47m192,i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
> video                  12432  1 i915
>
> as you can see smsc47m192 is loaded
>
> I uncomment
> ExecStop=-/sbin/modprobe -qabr $BUS_MODULES $HWMON_MODULES
>
> and run
> systemctl daemon-reload
> and
> systemctl stop lm_sensors.service
>
> I still have smsc47m192 loaded but when I do
>
> systemctl start lm_sensors.service
>
> module is unloaded
>
> Module                  Size  Used by
> ecryptfs               86341  1
> i2c_i801                9213  0
> serio_raw               4426  0
> iTCO_wdt               11480  0
> iTCO_vendor_support     2634  1 iTCO_wdt
> r8169                  35525  0
> mii                     4318  1 r8169
> ipv6                  282007  77
> sata_sil                8104  0
> i915                  346255  0
> drm_kms_helper         27243  1 i915
> drm                   187712  2 i915,drm_kms_helper
> i2c_algo_bit            4950  1 i915
> i2c_core               25468  5 i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
> video                  12432  1 i915

I added
RemainAfterExit=yes
and now service behaves as expected.


-- 
Best regards,
Michal

http://eventhorizon.pl/