$ git clone -n https://src.fedoraproject.org/rpms/textern.git /var/lib/mock/f41-build-side-1-2670590-29060/root/chroot_tmpdir/scmroot/textern
Cloning into '/var/lib/mock/f41-build-side-1-2670590-29060/root/chroot_tmpdir/scmroot/textern'...
$ git fetch origin 33039b4dffa88251e4a70c555ce34ddcd6c02ef6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/textern
 * [new ref]         33039b4dffa88251e4a70c555ce34ddcd6c02ef6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33039b4 convert GPLv3+ license to SPDX