$ git clone -n https://src.fedoraproject.org/rpms/folly.git /var/lib/mock/f39-build-1980042-43339/root/chroot_tmpdir/scmroot/folly
Cloning into '/var/lib/mock/f39-build-1980042-43339/root/chroot_tmpdir/scmroot/folly'...
$ git fetch origin 530556fb77e764b225af32c8a16d02b64421d952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/folly
 * [new ref]         530556fb77e764b225af32c8a16d02b64421d952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 530556f Update to 2023.10.16.00