$ git clone -n https://src.fedoraproject.org/rpms/perl-Wx.git /var/lib/mock/f41-build-816444-150177/root/chroot_tmpdir/scmroot/perl-Wx
Cloning into '/var/lib/mock/f41-build-816444-150177/root/chroot_tmpdir/scmroot/perl-Wx'...
$ git fetch origin 4cb3493309f0e172f12c25c498d0b687725fade3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Wx
 * [new ref]         4cb3493309f0e172f12c25c498d0b687725fade3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cb3493 Perl 5.40 rebuild