$ git clone -n https://src.fedoraproject.org/rpms/mytop.git /var/lib/mock/f41-build-1029475-18396/root/chroot_tmpdir/scmroot/mytop
Cloning into '/var/lib/mock/f41-build-1029475-18396/root/chroot_tmpdir/scmroot/mytop'...
$ git fetch origin c90262e5f22ce864653d1b14c20fdef76d38fe87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mytop
 * [new ref]         c90262e5f22ce864653d1b14c20fdef76d38fe87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c90262e Eliminate use of obsolete %patchN syntax (#2283636)