$ git clone -n https://src.fedoraproject.org/rpms/alglib.git /var/lib/mock/f41-build-side-1-2631541-25718/root/chroot_tmpdir/scmroot/alglib
Cloning into '/var/lib/mock/f41-build-side-1-2631541-25718/root/chroot_tmpdir/scmroot/alglib'...
$ git fetch origin 0b1f54b24f71b3818ff2d489c01e0ff2c6c0ed26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alglib
 * [new ref]         0b1f54b24f71b3818ff2d489c01e0ff2c6c0ed26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b1f54b convert license to SPDX