$ git clone -n https://src.fedoraproject.org/rpms/ghc-cmark-gfm.git /var/lib/mock/f40-build-2217908-52572/root/chroot_tmpdir/scmroot/ghc-cmark-gfm
Cloning into '/var/lib/mock/f40-build-2217908-52572/root/chroot_tmpdir/scmroot/ghc-cmark-gfm'...
$ git fetch origin 6ea5dbe92a0bd93f561f9e023dd9966e10ed99c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cmark-gfm
 * [new ref]         6ea5dbe92a0bd93f561f9e023dd9966e10ed99c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ea5dbe also remove unneeded cmake and c++ BRs