$ git clone -n https://src.fedoraproject.org/rpms/catch22.git /var/lib/mock/f40-build-1992325-43585/root/chroot_tmpdir/scmroot/catch22
Cloning into '/var/lib/mock/f40-build-1992325-43585/root/chroot_tmpdir/scmroot/catch22'...
$ git fetch origin 0a331bfefab502283ab19caf179bc8bca2edbeed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/catch22
 * [new ref]         0a331bfefab502283ab19caf179bc8bca2edbeed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a331bf F38+: Use %%{py3_test_envvars} to set up test environments