$ git clone -n https://src.fedoraproject.org/rpms/libportal.git /var/lib/mock/f45-build-16810-491/root/chroot_tmpdir/scmroot/libportal
Cloning into '/var/lib/mock/f45-build-16810-491/root/chroot_tmpdir/scmroot/libportal'...
$ git fetch origin 77e8817f4e0358df04e72c57a6ea85a7d13c7bba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libportal
 * [new ref]         77e8817f4e0358df04e72c57a6ea85a7d13c7bba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77e8817 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild