[packages/systemd] do not inherit $HOSTNAME when setting up /etc/hostname in systemd-units post scriptlet

[Jacek Konieczny]

On 2015-06-03 15:57, Elan Ruusamäe wrote:
>
>   the previous code caused permission issues in docker:
>
> [root at localhost] # docker run -i -t pld bash
> [root at fee5a8d66c6a /]# echo $HOSTNAME
> fee5a8d66c6a
> [root at fee5a8d66c6a /]# cat /etc/hostname
> fee5a8d66c6a
> [root at fee5a8d66c6a /]# poldek -u systemd-units
> 5:systemd-units ###########################################
> mv: cannot move '/etc/hostname' to '/etc/hostname.rpmsave': Device or
> resource busy
> Operation failed: No such file or directory
> [root at fee5a8d66c6a /]# ls -l /etc/sysconfig/network /etc/hostname
> ls: cannot access /etc/sysconfig/network: No such file or directory
> -rw-r--r-- 1 root root 13 Jun  3 13:52 /etc/hostname
> [root at fee5a8d66c6a /]# grep hostname /proc/mounts
> /dev/mapper/sys-docker /etc/hostname xfs
> rw,relatime,attr2,inode64,noquota 0 0
>
>
>
> why set up the file at all if the file already exists and is not-empty?

Exactly! If the file is there, then it must not me touched! That is an 
important part of the system configuration.

Jacek