$ git clone -n https://src.fedoraproject.org/rpms/pymol.git /var/lib/mock/f42-build-side-1-3566309-46733/root/chroot_tmpdir/scmroot/pymol
Cloning into '/var/lib/mock/f42-build-side-1-3566309-46733/root/chroot_tmpdir/scmroot/pymol'...
$ git fetch origin 2c2b73c4bbb0b13fbdaaef20c94bbf254a8f2f78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pymol
 * [new ref]         2c2b73c4bbb0b13fbdaaef20c94bbf254a8f2f78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c2b73c Fix duplicated files