$ git clone -n https://src.fedoraproject.org/rpms/swatch.git /var/lib/mock/f41-build-1016488-17897/root/chroot_tmpdir/scmroot/swatch
Cloning into '/var/lib/mock/f41-build-1016488-17897/root/chroot_tmpdir/scmroot/swatch'...
$ git fetch origin 74f39038784577463b72573d503779fb7af302c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swatch
 * [new ref]         74f39038784577463b72573d503779fb7af302c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74f3903 Eliminate use of obsolete %patchN syntax (#2283636)