Re: [OE-core] Issue: /var/tmp does not persist due to /var/volatile being tmpfs in fstab #scarthgap

[Niko Mauno <niko.mauno@vaisala.com>]

On 3/18/25 18:11, Vish via lists.openembedded.org wrote:
> Can we know the reasons for original changes here?
> https://git.yoctoproject.org/poky/commit/meta/recipes-core/systemd/ 
> systemd/00-create-volatile.conf? 
> h=scarthgap&id=3cc8c3520cedb66500757f843f757646da69ab30 <https:// 
> git.yoctoproject.org/poky/commit/meta/recipes-core/systemd/systemd/00- 
> create-volatile.conf? 
> h=scarthgap&id=3cc8c3520cedb66500757f843f757646da69ab30>
> I reviewed commit message but not giving much details. Considering 
> default base-files and as persistence is required, this newer approach 
> seems be an issue.

Hi Vish, that commit should only have the effect to avoid seeing an 
associated error line in systemd journal ("/var/tmp" already exists and 
is not a directory). The error line was stemming from the fact that in 
Yocto Scarthgap base-files creates /var/tmp as symlink to 
/var/volatile/tmp 
(https://git.yoctoproject.org/poky/tree/meta/recipes-core/base-files/base-files_3.0.14.bb?h=scarthgap#n87) 
which contradicts systemd's default runtime expectations.

The base-files provided /var/tmp -> /var/volatile/tmp symlink has been 
prevalent convention in Yocto for a very long time. (If you want to have 
/var/tmp as directory instead in Scarthgap I believe you can e.g. append 
base-files do_install() task to remove the symlink and replace it with 
directory.)

BR, Niko