$ git clone -n https://src.fedoraproject.org/rpms/simdjson.git /var/lib/mock/f41-build-side-1-2669919-28987/root/chroot_tmpdir/scmroot/simdjson
Cloning into '/var/lib/mock/f41-build-side-1-2669919-28987/root/chroot_tmpdir/scmroot/simdjson'...
$ git fetch origin 30bc1d4bcca94ab59fe8342f4f0c43a3cc9643d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/simdjson
 * [new ref]         30bc1d4bcca94ab59fe8342f4f0c43a3cc9643d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30bc1d4 Merge branch 'f40' into rawhide