$ git clone -n https://src.fedoraproject.org/rpms/perl-Wx-GLCanvas.git /var/lib/mock/f41-build-816719-150376/root/chroot_tmpdir/scmroot/perl-Wx-GLCanvas
Cloning into '/var/lib/mock/f41-build-816719-150376/root/chroot_tmpdir/scmroot/perl-Wx-GLCanvas'...
$ git fetch origin a38455f7116c83986ce68be262d3b6769bbaa5ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Wx-GLCanvas
 * [new ref]         a38455f7116c83986ce68be262d3b6769bbaa5ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a38455f Perl 5.40 rebuild