$ git clone -n https://src.fedoraproject.org/rpms/guile-gnutls.git /var/lib/mock/f41-build-857347-168049/root/chroot_tmpdir/scmroot/guile-gnutls
Cloning into '/var/lib/mock/f41-build-857347-168049/root/chroot_tmpdir/scmroot/guile-gnutls'...
$ git fetch origin 24f9dd70291bd4df2d228c3b22a7e605eb09c079:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile-gnutls
 * [new ref]         24f9dd70291bd4df2d228c3b22a7e605eb09c079 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24f9dd7 Update guile requires