$ git clone -n https://src.fedoraproject.org/rpms/R-pkgcache.git /var/lib/mock/f38-build-side-42-init-devel-898905-28582/root/chroot_tmpdir/scmroot/R-pkgcache
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-898905-28582/root/chroot_tmpdir/scmroot/R-pkgcache'...
$ git fetch origin cabb334abc8614decfd1dfbdb094ae909ea953c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgcache
 * [new ref]         cabb334abc8614decfd1dfbdb094ae909ea953c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cabb334 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild