$ git clone -n https://src.fedoraproject.org/rpms/python-git-changelog.git /var/lib/mock/f45-build-30872-648/root/chroot_tmpdir/scmroot/python-git-changelog
Cloning into '/var/lib/mock/f45-build-30872-648/root/chroot_tmpdir/scmroot/python-git-changelog'...
$ git fetch origin 1b148e9ce5af9da03d0e61a884eeaf1b2f66c94d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-git-changelog
 * [new ref]         1b148e9ce5af9da03d0e61a884eeaf1b2f66c94d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b148e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild