$ git clone -n https://src.fedoraproject.org/rpms/R-biglm.git /var/lib/mock/f41-build-1111447-20153/root/chroot_tmpdir/scmroot/R-biglm
Cloning into '/var/lib/mock/f41-build-1111447-20153/root/chroot_tmpdir/scmroot/R-biglm'...
$ git fetch origin 364dcb75c6d992ef0da40541ddbdebc2f2e023af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-biglm
 * [new ref]         364dcb75c6d992ef0da40541ddbdebc2f2e023af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 364dcb7 convert GPL+ license to SPDX