$ git clone -n https://src.fedoraproject.org/rpms/blivet-gui.git /var/lib/mock/f45-build-4881-336/root/chroot_tmpdir/scmroot/blivet-gui
Cloning into '/var/lib/mock/f45-build-4881-336/root/chroot_tmpdir/scmroot/blivet-gui'...
$ git fetch origin 3e2c6359ee01f01a51414a4c1251fc286dd8c842:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blivet-gui
 * [new ref]         3e2c6359ee01f01a51414a4c1251fc286dd8c842 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e2c635 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild