$ git clone -n https://src.fedoraproject.org/rpms/rpmgrill.git /var/lib/mock/f39-build-1675992-40920/root/chroot_tmpdir/scmroot/rpmgrill
Cloning into '/var/lib/mock/f39-build-1675992-40920/root/chroot_tmpdir/scmroot/rpmgrill'...
$ git fetch origin 48cd0ee3355197c3db97a9c919466cab438b3096:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmgrill
 * [new ref]         48cd0ee3355197c3db97a9c919466cab438b3096 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48cd0ee Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild