$ git clone -n https://src.fedoraproject.org/rpms/perl-Boost-Geometry-Utils.git /var/lib/mock/f41-build-787174-13594/root/chroot_tmpdir/scmroot/perl-Boost-Geometry-Utils
Cloning into '/var/lib/mock/f41-build-787174-13594/root/chroot_tmpdir/scmroot/perl-Boost-Geometry-Utils'...
$ git fetch origin 2d09197d868ecc6c9961d780e074fca5751809b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Boost-Geometry-Utils
 * [new ref]         2d09197d868ecc6c9961d780e074fca5751809b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d09197 Eliminate use of obsolete %patchN syntax (#2283636)