Hello,

The recent problem with Tomcat forced me to think how we can detect that some 
other package broke IPA before it hit users.

After all, it seems pretty easy.

0) Get a VM for testing purposes (preferably with minimal set of IPA 
dependencies). The VM has to be reverted to snapshot after every run. (This is 
pretty simple with RHEV-M/libvirt.)

1) Detect all changes in the minimal set of packages installed on the test VM.

It is easy because we can simply hash output of YUM/DNF "upgrade" command:

# echo "n" | dnf upgrade | md5sum > changeset.id

changeset.id will change every time when a package which is present on test 
system changes but stays the same if there were no updates from last run. 
(There could be false positives but it doesn't matter - the test will be simply 
run twice.)

2) if (changeset.id != previous_changeset.id)
run_tests()

3) This machinery could be triggered by cron or even by a message on fedmsg 
about a new package pushed to updates-testing...

Tests could use released versions of IPA (present in fedora-updates) to get 
better signal/noise ratio.

Okay, it is time to stop dreaming and go to bed. Good night from Europe :-)

-- 
Petr^2 Spacek

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