[releng] Issue #7388: predicting dependency failures in image builds

[Dusty Mabe]

dustymabe reported a new issue against the project: `releng` that you are following:
``

It would be nice if we could predict when dependency failures in image builds will happen.
I have been using a rough set of commands to do this in the past few weeks but this could
be polished up and put in place to forecast failures.


What I;ve been doing is:

`
dnf --releasever 29 --installroot /srv/installroot/ --disablerepo=* --enablerepo=today
--enablerepo=koji install $(cat packages.txt | sed 's/^-/--exclude /' | tr
'\n' ' ')
`

- where repo `today` is today's rawhide run
- where repo `koji` is the f29-build repo
- where packages.txt is the %packages list from a kickstart file

This is a pretty good indicator of failures.

This could be refined and put into a testing framework to run often. Steps: For each
kickstart do:

- `ksflatten` kickstart file and get `%packages` list
- For groups use libcomps and fedora-comps repo to determine packages
- use koji `f29-build` repo and list of packages to determine if there are missing
dependencies


``

To reply, visit the link below or just reply to this email
https://pagure.io/releng/issue/7388

[Igor Gnatenko]

ignatenkobrain added a new comment to an issue you are following:
``
yes, koji should do same. But instead of doing `dnf install`, it's much more efficient
to use libsolv's or DNF's API to do dependency solving.
``

To reply, visit the link below or just reply to this email
https://pagure.io/releng/issue/7388

[Dusty Mabe]

dustymabe added a new comment to an issue you are following:
``
>  yes, koji should do same. But instead of doing dnf install, it's
> much more efficient to use libsolv's or DNF's API to do dependency solving.
>  
yeah I only included the dnf command in there so I can do it again if I need to soon. if
we call the API I'd like to get a nice error message to output in the test without
writing a bunch of code to do it. I know `/usr/bin/dnf` will do that for us, I don't
know about the API. 


``

To reply, visit the link below or just reply to this email
https://pagure.io/releng/issue/7388

[Suzanne Yeghiayan]

The issue: `predicting dependency failures in image builds` of project: `releng` has been
assigned to `humaton` by syeghiay.

https://pagure.io/releng/issue/7388