[Libguestfs] S3 plugin test case breaks test suite / development workflow...

Hi, I'm writing this about a specific problem and about a general problem. * The specific problem is that commit 5130c43bc1f9 ("S3 plugin: add support for accessing multiple objects", 2022-05-12) introduced a dependency on the "botocore" python module, and now "make check" fails for me, because this module is unavailable on my system. Now, while the README file says, from commit 6715c3d8b3e6 ("New plugin: S3 plugin for accessing disks stored in AWS S3 and Ceph.", 2020-11-14): the "boto3" dependency had never been a "hard" one until commit 5130c43bc1f9. The language suggests that running the S3 plugin -- even for testing -- is optional. Therefore, commit 5130c43bc1f9 should have updated the test cases "test-S3.sh" and "test-S3-unit.sh" with a proper "requires" line (I assume anyway). FWIW, the following trick in "test-S3.sh": Does not work. ... So, after all, the bug in commit 5130c43bc1f9 may have been that it did not add the ClientError exception type to the fake module in "tests/test-S3/boto3". I'm unsure; but please fix it anyway. * The generic problem is that I need to write this separate error report email, rather than commenting directly under the submission -- on the mailing list -- or the pull request -- on gitlab -- that ended up as commit 5130c43bc1f9. For the life of me, I just can't figure out *where* commit 5130c43bc1f9 was originally reviewed. I think that's wrong. ... Ultimately, I've found the patch in the MR listing at <https://gitlab.com/nbdkit/nbdkit/-/merge_requests?scope=all&state=all>;, namely in MR#9 -- <https://gitlab.com/nbdkit/nbdkit/-/merge_requests/9>;. But this merge request has status *closed*, not *merged*. So even though a commit is given, I can't find the associated discussion because (a) MR#9 is not listed in the list of *merged* merge requests (only the "rejected" ones), (b) the commit message itself does not reference MR#9. I think we should improve our process here. Thanks, Laszlo