$ git clone -n https://src.fedoraproject.org/rpms/R-promises.git /var/lib/mock/f38-build-side-42-init-devel-603451-26218/root/chroot_tmpdir/scmroot/R-promises
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-603451-26218/root/chroot_tmpdir/scmroot/R-promises'...
$ git fetch origin 42d1f5dbafc0ec500fdce4e75475fa6b9fbbbdf4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-promises
 * [new ref]         42d1f5dbafc0ec500fdce4e75475fa6b9fbbbdf4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42d1f5d Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild