$ git clone -n https://src.fedoraproject.org/rpms/python-grabserial.git /var/lib/mock/f45-build-30892-648/root/chroot_tmpdir/scmroot/python-grabserial
Cloning into '/var/lib/mock/f45-build-30892-648/root/chroot_tmpdir/scmroot/python-grabserial'...
$ git fetch origin 35b8124acaa43780868de68db4b4cc1e529f8b71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-grabserial
 * [new ref]         35b8124acaa43780868de68db4b4cc1e529f8b71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35b8124 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild