$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Sexy.git /var/lib/mock/f41-build-816700-150356/root/chroot_tmpdir/scmroot/perl-Gtk2-Sexy
Cloning into '/var/lib/mock/f41-build-816700-150356/root/chroot_tmpdir/scmroot/perl-Gtk2-Sexy'...
$ git fetch origin 9390413fe728d395f6a49c8b78e9b2118ff403cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Sexy
 * [new ref]         9390413fe728d395f6a49c8b78e9b2118ff403cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9390413 Perl 5.40 rebuild