$ git clone -n https://src.fedoraproject.org/rpms/python-b2sdk.git /var/lib/mock/f45-build-29683-640/root/chroot_tmpdir/scmroot/python-b2sdk
Cloning into '/var/lib/mock/f45-build-29683-640/root/chroot_tmpdir/scmroot/python-b2sdk'...
$ git fetch origin a2bb294793b9921fc6e16658b79d73b65d6ef691:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-b2sdk
 * [new ref]         a2bb294793b9921fc6e16658b79d73b65d6ef691 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2bb294 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild