$ git clone -n https://src.fedoraproject.org/rpms/flex.git /var/lib/mock/f40-build-1996534-44028/root/chroot_tmpdir/scmroot/flex
Cloning into '/var/lib/mock/f40-build-1996534-44028/root/chroot_tmpdir/scmroot/flex'...
$ git fetch origin d687d8a4131309aafaed893f27058d3007a6910a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flex
 * [new ref]         d687d8a4131309aafaed893f27058d3007a6910a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d687d8a Migrate License field to SPDX identifiers