Created attachment 1779977 [details]
Add missing _modules attribute to Compose

Description of problem:
RHEL8 has productmd 1.11 which includes a Modules class [0] for processing modules.  However, that version also had a bug where the modules are inaccessible from the Compose class.  This was fixed upstream in version 1.15 [1].  It's a simple one line fix.  Please backport it to the RHEL8 package.  I'm including a backport patch adapted directly from the upstream commit.


Version-Release number of selected component (if applicable):
python3-productmd-1.11-3.el8


How reproducible:
always


Steps to Reproduce:
1. dnf install python3 python3-productmd
2. python3 -c 'import productmd; print(productmd.compose.Compose("path/to/compose").modules)'


Actual results:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.6/site-packages/productmd/compose.py", line 131, in modules
    if self._modules is not None:
AttributeError: 'Compose' object has no attribute '_modules'


Expected results:
<productmd.modules.Modules object at 0x7f603c609700>


Additional info:
I also noticed that there is a request to rebase productmd to 1.25 [2].  If that is actioned this backport will not be necessary.  But one of the two will be needed to unblock building compose-utils in epel8 [3].


[0] https://github.com/release-engineering/productmd/commit/9be98ed1bceff5418f8e395cd0263b53544e6fa7
[1] https://github.com/release-engineering/productmd/commit/13ba89db6619e3b20a690be19ef1340faa0c633a
[2] bug 1819185
[3] bug 1956420