[Apt-cacher-ng-users] Expiration wants to delete almost all packages

[Tim Edwards]

On 14/05/16 22:36, Eduard Bloch wrote:
> Hallo,
> * Eduard Bloch [Sun, May 08 2016, 12:41:43PM]:
>> Hallo,
>> * Tim Edwards [Sat, May 07 2016, 05:38:45PM]:
>>
>>> I'm guessing apt-cacher-ng doesn't support this? I can't find a way to
>>> turn it off though.
>>> https://wiki.ubuntu.com/AptByHash
>>>
>> The by-hash implementation is the most likely reason. I need to extend
>> the code to move the stuff correctly in the cache (todo ASAP, probably
>> in the next days).
>>
>> There is a way to turn it off but it is a brutal one.
>>
>> /usr/lib/apt-cacher-ng/acngtool cfgdump | grep =.*by.hash > /etc/apt-cacher-ng/zzz_temp_override.conf
>>
>> And then edit the new file and remove the "by-hash" strings there, or
>> better change them to NOBYHASH or something. Don't forget to remove the
>> file when proper support is available.
> Version 0.9.2 has a stop-gar solution for this problem now.
> It still needs more work, to support two additional things:
>
> a) identify latest version from by-hash file set and install them into
> target location (i.e. reuse the data where needed)
>
> b) in cases where multiple download mirrors are configured and the first
> one is missing hashed files, it might switch to another one and try
> there instead of returning 404 (which would make APT fall back to legacy
> scheme). However, this algorithm needs to be properly tuned; hopping
> through the list until the last mirror is tried is probably less
> efficient that just returning 404 after a couple of attempts. Or try
> around until the last mirror is accessed. But it's also error-prone, I
> guess people are configuring the mirror list in order of preference and
> the last one might be the least reliable one, and might be not
> accessible when needed.
>
> Not sure which strategy to implement here. If someone has specific
> wishes, please reveal them.
>
> <more brainstorming>
>
> In case this strategy would be configured, there is also the question
> where to do it in the config. Since it would act similar to the current
> keyfile option, but which parameters are needed? Maybe something like:
>
> hashmissrotation=50% # try download from alternative mirrors for 404-Not-Found errors until half of available mirrors are tried, then report 404 to caller and stay on that mirror for the remaining downloads for this client connection
>
> Any opinions?
>
> Best Regards,
> Eduard.
>
Hi Eduard,

I don't use multiple mirrors in my apt config as far as I know, but if I
did I think your proposal of putting a hasmissrotation option in is a
good idea. If you're not sure how it affects people's different
configurations it's best to make it configurable I guess.

I've tried installing the latest apt-cacher-ng on Ubuntu 16.04 but
there's a dependency problem:
$ sudo apt-get upgrade apt-cacher-ng
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Calculating upgrade... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 apt-cacher-ng : Depends: libssl1.0.2 (>= 1.0.2d) but it is not installable
E: Broken packages
tim at localhost:~/$ dpkg -l | grep libssl1
ii  libssl1.0.0:amd64                              
1.0.2g-1ubuntu4.1                          amd64        Secure Sockets
Layer toolkit - shared libraries
ii  libssl1.0.0:i386                               
1.0.2g-1ubuntu4.1                          i386         Secure Sockets
Layer toolkit - shared libraries


Do you think that dependency really need to be that strict? It looks
like the Ubuntu package is actually providing 1.0.2g even if the package
name is libssl1.0.0.

Best regards
Tim