$ git clone -n https://src.fedoraproject.org/rpms/sfwbar.git /var/lib/mock/f45-build-35843-699/root/chroot_tmpdir/scmroot/sfwbar
Cloning into '/var/lib/mock/f45-build-35843-699/root/chroot_tmpdir/scmroot/sfwbar'...
$ git fetch origin fcbf3a58938d7ac6ae902f12d019704aebb79a54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sfwbar
 * [new ref]         fcbf3a58938d7ac6ae902f12d019704aebb79a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcbf3a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild