$ git clone -n https://src.fedoraproject.org/rpms/ghc-semver.git /var/lib/mock/f40-build-798319-141884/root/chroot_tmpdir/scmroot/ghc-semver
Cloning into '/var/lib/mock/f40-build-798319-141884/root/chroot_tmpdir/scmroot/ghc-semver'...
$ git fetch origin 6e4f10cbe0209d439fbbe13fbaf97ae40089e4a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-semver
 * [new ref]         6e4f10cbe0209d439fbbe13fbaf97ae40089e4a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e4f10c Rebuild to fix earlier mass rebuild failure