$ git clone -n https://src.fedoraproject.org/rpms/asio.git /var/lib/mock/f38-build-720678-97823/root/chroot_tmpdir/scmroot/asio
Cloning into '/var/lib/mock/f38-build-720678-97823/root/chroot_tmpdir/scmroot/asio'...
$ git fetch origin 0dd39e572b269a9803630c1ec942d48deaedc808:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/asio
 * [new ref]         0dd39e572b269a9803630c1ec942d48deaedc808 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0dd39e5 Update to 1.28.0 and cleanup the .spec