$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-get-opt.git /var/lib/mock/f45-build-10775-424/root/chroot_tmpdir/scmroot/ghc-simple-get-opt
Cloning into '/var/lib/mock/f45-build-10775-424/root/chroot_tmpdir/scmroot/ghc-simple-get-opt'...
$ git fetch origin f927cbf6d0ca933a80769311241adac27248cc4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-get-opt
 * [new ref]         f927cbf6d0ca933a80769311241adac27248cc4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f927cbf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild