touch-packages team mailing list archive

[Sworddragon <924283@xxxxxxxxxxxxxxxxxx>]

> And update explicitly rebuilds the cache.

It would be really nice if we could get back the old behavior here - the
cache gets only rebuilded if there are only real changes. But I have
found an easier testcase to reproduce this issue:

root@ubuntu:~# time apt-get clean

real	0m0.025s
user	0m0.004s
sys	0m0.021s
root@ubuntu:~# time apt-get check firefox
Reading package lists... Done
Building dependency tree       
Reading state information... Done

real	0m6.724s
user	0m3.423s
sys	0m0.148s
root@ubuntu:~# time apt-get check firefox
Reading package lists... Done
Building dependency tree       
Reading state information... Done

real	0m0.447s
user	0m0.430s
sys	0m0.017s
root@ubuntu:~# time apt-get clean

real	0m0.018s
user	0m0.004s
sys	0m0.013s
root@ubuntu:~# time apt-get check firefox
Reading package lists... Done
Building dependency tree       
Reading state information... Done

real	0m6.516s
user	0m3.371s
sys	0m0.161s


As this example shows "apt-get clean" causes the next command that reads from the package cache to rebuld it while there are even no explicit changes.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/924283

Title:
  Package lists are fully readed if there are no changes

Status in “apt” package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu 12.04 dev with apt 0.8.16~exp12ubuntu3. Since apt was
  updated from 0.8.16~exp5 to 0.8.16~exp12 the package lists are fully
  readed ("Reading package lists... Done") on every "apt-get update".
  This is no problem if there are new package lists available. But apt
  is doing now such a full reading even if the lists have not changed.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/924283/+subscriptions