$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Pragma.git /var/lib/mock/f41-build-816518-150225/root/chroot_tmpdir/scmroot/perl-Devel-Pragma
Cloning into '/var/lib/mock/f41-build-816518-150225/root/chroot_tmpdir/scmroot/perl-Devel-Pragma'...
$ git fetch origin 81b70dc4d2f8a0d22e4043a1cb5fece3c8ab9db6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Pragma
 * [new ref]         81b70dc4d2f8a0d22e4043a1cb5fece3c8ab9db6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81b70dc Perl 5.40 rebuild