$ git clone -n https://src.fedoraproject.org/rpms/rocksdb.git /var/lib/mock/f40-build-2215043-52407/root/chroot_tmpdir/scmroot/rocksdb
Cloning into '/var/lib/mock/f40-build-2215043-52407/root/chroot_tmpdir/scmroot/rocksdb'...
$ git fetch origin 5a58bd31e80e7c9fcf0b491a7b38d97e134276b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rocksdb
 * [new ref]         5a58bd31e80e7c9fcf0b491a7b38d97e134276b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a58bd3 BuildRequires with python3-devel instead of /usr/bin/python3. See rhbz#2237693