#!/bin/bash

# if no variable of $PYTHON is define - we try to find it
function find_python {
    # two candidates - machine python and cisco linux python
    MACHINE_PYTHON=python
    CEL_PYTHON=/router/bin/python-2.7.4

    # try the machine python
    PYTHON=$MACHINE_PYTHON
    PCHECK=`$PYTHON -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver < 27)"`
    if [ $? -eq 0 ]; then
        return
    fi

    # try the CEL python
    PYTHON=$CEL_PYTHON
    PCHECK=`$PYTHON -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver < 27)"`
    if [ $? -eq 0 ]; then
        return
    fi

    echo "*** $PYTHON - python version is too old, 2.7 at least is required"
    exit -1
}

function find_python3 {
    MACHINE_PYTHON=python3
    ITAY_PYTHON=/auto/proj-pcube-b/apps/PL-b/tools/python3.4/bin/python3
    PYTHON3=$MACHINE_PYTHON
    PCHECK=`$PYTHON3 -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver != 34)"`
    if [ $? -eq 0 ]; then
        return
    fi
    PYTHON3=$ITAY_PYTHON
    PCHECK=`$PYTHON3 -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver != 34)"`
    if [ $? -eq 0 ]; then
        return
    fi
    echo "*** $PYTHON3 - python version does not match, 3.4 is required"
    exit -1
}

if [ -z "$PYTHON" ]; then
    find_python
fi

if [ -z "$PYTHON3" ]; then
    find_python3
fi