$ git clone -n https://src.fedoraproject.org/rpms/guile.git /var/lib/mock/f38-build-side-42-init-devel-654055-26579/root/chroot_tmpdir/scmroot/guile
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-654055-26579/root/chroot_tmpdir/scmroot/guile'...
$ git fetch origin e1794e56c7ccc42cd78c49f9c02456675c02a6c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile
 * [new ref]         e1794e56c7ccc42cd78c49f9c02456675c02a6c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1794e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild