$ git clone -n https://src.fedoraproject.org/rpms/tigervnc.git /var/lib/mock/f41-build-1041931-18994/root/chroot_tmpdir/scmroot/tigervnc
Cloning into '/var/lib/mock/f41-build-1041931-18994/root/chroot_tmpdir/scmroot/tigervnc'...
$ git fetch origin 369b379982f999b31c08b29e9ae22b60ecb8a3c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tigervnc
 * [new ref]         369b379982f999b31c08b29e9ae22b60ecb8a3c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 369b379 Eliminate use of obsolete %patchN syntax (#2283636)