$ git clone -n https://src.fedoraproject.org/rpms/perl-OpenGL-GLUT.git /var/lib/mock/f45-build-25437-611/root/chroot_tmpdir/scmroot/perl-OpenGL-GLUT
Cloning into '/var/lib/mock/f45-build-25437-611/root/chroot_tmpdir/scmroot/perl-OpenGL-GLUT'...
$ git fetch origin d21a66fafe3356e9647afad6dbfbf7a2e2fe9571:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-OpenGL-GLUT
 * [new ref]         d21a66fafe3356e9647afad6dbfbf7a2e2fe9571 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d21a66f Perl 5.44 rebuild