On Wed, 29 Dec 2021 at 12:49, Gordon Messmer <gordon.messmer@xxxxxxxxx> wrote:
On 12/29/21 07:26, Vitaly Zaitsev via devel wrote:
> On 29/12/2021 16:01, Ben Cotton wrote:
>> Currently, the RPM databases is located in `/var`. Let's move it to
>> `/usr`. The move is already under way in rpm-ostree-based
>> installations, and in (open)SUSE.
>
> It will break FHS compatibility. /usr must contain read-only data.
If /usr really is read-only, then it probably doesn't matter where the
rpmdb is, since packages can't be installed (generally).
The modern day case where /usr is read-only is inside a container and you put an overlay or using some sort of linking to /var which is read-write in case of reboots. To me this is like saying 'move everything into /usr but because its volitile move it back into /var but in a sub-directory from where it was so you can keep an image running.' In this case, this doesn't sound like any savings and more of a headache of why did it corrupt this time.
Looking at my /var/lib in F35, the __db.*** files seems to get written to regularly but I am not sure why. That would probably be something to track down and remove from images afterwards.
Moreover, for systems where /usr is read-only and/or shared (especially
stateless systems), having the rpmdb on /usr seems like the most
rational place for it, if one expects to be able to use rpm to query the
package list. Otherwise, there is an implicit coupling of /usr and
/var/lib/rpmdb that requires two mounts rather than one.
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