Help me to understand armbian-ramlog where he log!

[Pol Isidor]

I realised, that my OrangePI Plus 2E doing the logrotate of /var/log.hdd and not /var/log dir

I'm using:

 

root@orangepiplus2e:~# lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

root@orangepiplus2e:~# uname -r
5.3.13-sunxi

In my dir /etc/logrotate.d/ I realised that in every file standing: /var/log.hdd/.... as a path for logrotate even if I change to /var/log/... everytime when I restart my box.

Now if I understand correctly the ram part is named: /var/log/... what can I see from:

root@orangepiplus2e:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            939M     0  939M   0% /dev
tmpfs           202M  556K  201M   1% /run
/dev/mmcblk0p1   15G  4.6G  9.4G  33% /
tmpfs          1007M     0 1007M   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs          1007M     0 1007M   0% /sys/fs/cgroup
tmpfs          1007M   44K 1006M   1% /tmp
mrtg2ram         10M  3.4M  6.7M  34% /var/www/mrtg
/dev/zram0      340M  7.1M  308M   3% /var/log
tmpfs           202M     0  202M   0% /run/user/0

Here I see that /dev/zram0 is mounted as /var/log. Size I changed in /etc/default/armbian-ramlog.

I inspected and found the file: /usr/lib/armbian/armbian-hardware-optimization is responsable for changing path from /var/log to /var/log/hdd

 

Now what I do not understand is if-else-fi part of function prepare_board() from this file.

CheckDevice=$(for i in /var/log /var / ; do findmnt -n -o SOURCE $i && break ; done)
# adjust logrotate configs
if [[ "${CheckDevice}" == "/dev/zram0" || "${CheckDevice}" == "armbian-ramlog" ]]; then
	for ConfigFile in /etc/logrotate.d/* ; do sed -i -e "s/\/log\//\/log.hdd\//g" "${ConfigFile}"; done
	sed -i "s/\/log\//\/log.hdd\//g" /etc/logrotate.conf
else
	for ConfigFile in /etc/logrotate.d/* ; do sed -i -e "s/\/log.hdd\//\/log\//g" "${ConfigFile}"; done
	sed -i "s/\/log.hdd\//\/log\//g" /etc/logrotate.conf
fi

First line checking is it exist the path /dev/zram0

Secod line if yes then rename in every file from /etc/logrotate.d/ pattern /var/log to /var/log.hdd

....

If not do reverse...

 

Why is implemented this?

If all my logs going to /var/log and it's raising what is the logic, if the armbian-ramlog enabled, to rotate /var/log.hdd and not the /var/log ?

Who will then rotate /var/log if it will be full let it say after 12h or 96h?

This problem I had not on Armbian with kernel v3.4.xxx (Jessie), that after every restart the content of files in logrotate.d was renamed.

Because I'm not able to understand the logic bihind this I have opinion as it is reversed this if-else-fi part.

 

Would be someone so kind to explain me the logic?

Thx