$ git clone -n https://src.fedoraproject.org/rpms/xsel.git /var/lib/mock/f40-build-789025-135482/root/chroot_tmpdir/scmroot/xsel
Cloning into '/var/lib/mock/f40-build-789025-135482/root/chroot_tmpdir/scmroot/xsel'...
$ git fetch origin 5a64003a75bd56b65518abd600f59f1c9721a1f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsel
 * [new ref]         5a64003a75bd56b65518abd600f59f1c9721a1f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a64003 Update to upstream version 1.2.1