$ git clone -n https://src.fedoraproject.org/rpms/sessreg.git /var/lib/mock/f45-build-35780-699/root/chroot_tmpdir/scmroot/sessreg
Cloning into '/var/lib/mock/f45-build-35780-699/root/chroot_tmpdir/scmroot/sessreg'...
$ git fetch origin 8af19e6f9e02939deb85406ea20a97612a17f21f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sessreg
 * [new ref]         8af19e6f9e02939deb85406ea20a97612a17f21f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8af19e6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild