$ git clone -n https://src.fedoraproject.org/rpms/libffi.git /var/lib/mock/f41-build-side-1-2793940-32698/root/chroot_tmpdir/scmroot/libffi
Cloning into '/var/lib/mock/f41-build-side-1-2793940-32698/root/chroot_tmpdir/scmroot/libffi'...
$ git fetch origin fa2107f4e0f1fa1acb1cbf5f75222e2c5c149c03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libffi
 * [new ref]         fa2107f4e0f1fa1acb1cbf5f75222e2c5c149c03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa2107f Fix AArch64 BTI enablement issues (#2305877)