Re: dnf cache downloading behavior

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Dne 22.7.2017 v 23:26 Neal Gompa napsal(a):
> On Sat, Jul 22, 2017 at 5:11 PM, Zbigniew Jędrzejewski-Szmek
> <zbyszek@xxxxxxxxx> wrote:
>> On Sat, Jul 22, 2017 at 02:06:42PM -0600, Chris Murphy wrote:
>>> On Sat, Jul 22, 2017 at 1:57 PM, Matthew Miller
>>> <mattdm@xxxxxxxxxxxxxxxxx> wrote:
>>>> On Sat, Jul 22, 2017 at 01:42:11PM -0600, Chris Murphy wrote:
>>>>> I don't know what things the unprivileged user can do other than
>>>>> search and info. But off hand I'd say an unprivileged user should not
>>>>> be able to download metadata. Use one /var/cache/dnf always. And if
>>>>> it's stale, just inform the user. Only update the cache if the command
>>>>> is issued by root.
>>>> I dunno; what harm is there in giving the ability to use a separate
>>>> user cache for queries? This allows you to do things like repoquery as
>>>> an unprivileged user for repos that aren't enabled by default.
>>> I'm fine with a layered approach, *if* a repo db does not exist for
>>> root, then it's OK for a user copy to be downloaded, but how about one
>>> for all users to share rather than each user getting a downloaded copy
>>> of the same thing?
>> It'd probably require rearchitecturing the way that caching works.
>> Current implementation does the best (maybe ignoring some minor bugs)
>> of what is possible in a secure way with unprivileged users in current
>> design, but we should be able to do better. Namely, create a polkit-aware
>> daemon which will download metadata on demand, and then make root and
>> the users forward all metadata download requests to this daemon.
>> This would avoid any duplicate downloads, without the need to run
>> dnf searches as root.
>>
>> (Ideally, dnf would also have strong tmpfiles.d policy to clean up all
>> caches after ~1 month of unuse, so that if a user requests some repo,
>> the disk space is not permanently wasted.)
>>
> So... like dnfdaemon, except with less capabilities?
>
>

I already proposed it to DNF upstream while ago due to different use case:

https://bugzilla.redhat.com/show_bug.cgi?id=1382224#c15



Vít
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