$ git clone -n https://src.fedoraproject.org/rpms/ghc-entropy.git /var/lib/mock/f45-build-10240-414/root/chroot_tmpdir/scmroot/ghc-entropy
Cloning into '/var/lib/mock/f45-build-10240-414/root/chroot_tmpdir/scmroot/ghc-entropy'...
$ git fetch origin e248e60af5b827d37857209a44f990c415ac2261:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-entropy
 * [new ref]         e248e60af5b827d37857209a44f990c415ac2261 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e248e60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild