$ git clone -n https://src.fedoraproject.org/rpms/gtk-sharp2.git /var/lib/mock/f41-build-703880-12985/root/chroot_tmpdir/scmroot/gtk-sharp2
Cloning into '/var/lib/mock/f41-build-703880-12985/root/chroot_tmpdir/scmroot/gtk-sharp2'...
$ git fetch origin 83f3231b59c0686904168b65cada537345a6af0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk-sharp2
 * [new ref]         83f3231b59c0686904168b65cada537345a6af0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83f3231 Eliminate use of obsolete %patchN syntax (#2283636)