$ git clone -n https://src.fedoraproject.org/rpms/gpaste.git /var/lib/mock/f40-build-2499483-61672/root/chroot_tmpdir/scmroot/gpaste
Cloning into '/var/lib/mock/f40-build-2499483-61672/root/chroot_tmpdir/scmroot/gpaste'...
$ git fetch origin 2b2bd2b398366543f87a581419e8bd58390ba9d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpaste
 * [new ref]         2b2bd2b398366543f87a581419e8bd58390ba9d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b2bd2b Drop support for i686