$ git clone -n https://src.fedoraproject.org/rpms/mvfst.git /var/lib/mock/f39-build-2381348-60456/root/chroot_tmpdir/scmroot/mvfst
Cloning into '/var/lib/mock/f39-build-2381348-60456/root/chroot_tmpdir/scmroot/mvfst'...
$ git fetch origin 904abaef6c77236ae1b24c84c07ea102f7be5283:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mvfst
 * [new ref]         904abaef6c77236ae1b24c84c07ea102f7be5283 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 904abae Update to 2023.10.16.00