Update Dockerfile

Dockerfile

-#Run from docker container
-#docker build -f Dockerfile -t esp:latest . 
-#Run with
-#docker run -t -i --device=/dev/ttyUSB0 ubuntu bash
+############################################################
+# Dockerfile to build esp32 container
+## Author: Alois Mbutura
+## Modified by : Allan Juma
+
+#run with docker run -t -i --device=/dev/ttyUSB0 ubuntu bash
+#The script here is derived from: http://esp-idf.readthedocs.io/en/latest/linux-setup.html
+
+############################################################
+
+# Set the base image to Ubuntu
+FROM ubuntu:16.04
+
+# File Author / Maintainer
+MAINTAINER [email protected]
+
+# Update the repository sources list
+RUN apt-get update
+
+################## BEGIN INSTALLATION ######################
+
+RUN BASE=$(pwd)
+
+RUN apt-get update && apt-get install -y git make libncurses-dev flex bison gperf python python-serial wget --fix-missing
+
+# Get or update IDF
+RUN echo "[$0]:  Get or update IDF"
+RUN if [ -d esp-idf ]; then echo "[$0]:  Found esp-idf, updating." && cd esp-idf && git pull && git submodule update --recursive && cd $BASE; else git clone --recursive https://github.com/espressif/esp-idf.git; fi
+
+## Perform mandatory removal of any tar files in case of a previous error
+RUN if [ -f *.tar.gz ] || [ -f *.tar.gz.* ]; then echo "[$0]:  Removing residual tar file(s)" && rm *.tar.gz 2>/dev/null && rm *.tar.gz.* 2>/dev/null; fi
+
+## Get 64 bit linux binary toolchain -- this might get out of date when they change blobs:
+## Current version 1.22.0-61-gab8375a-5.2.0
+RUN if [ -d xtensa-esp32-elf ]; then echo "[$0]:  Found ESP32 binary toolchain. Performing mandatory replacement." && echo "[$0]:  Current version at the making of this makefile 1.22.0-61-gab8375a-5.2.0" && echo "[$0]:  Check current version from http://esp-idf.readthedocs.io/en/latest/linux-setup.html" && rm -rf xtensa-esp32-elf && wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-61-gab8375a-5.2.0.tar.gz && tar -xvzf xtensa-esp32-elf-linux64-1.22.0-61-gab8375a-5.2.0.tar.gz; else wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-61-gab8375a-5.2.0.tar.gz && tar -xvzf xtensa-esp32-elf-linux64-1.22.0-61-gab8375a-5.2.0.tar.gz && rm *.tar.gz; fi
+
+## Get demo application
+RUN echo "[$0]:  Get demo application" && if [ -d esp-idf-template ]; then echo "[$0]:  Found esp-idf-template, updating." && cd esp-idf-template && git pull &&  cd $BASE; else  git clone https://github.com/espressif/esp-idf-template.git; fi
+
+## Setup environment variables:
+##  Works for _this_ directory structure.  You will need to change these if you deviate
+## Also, you might copy these lines into a separate script  to reset these variables as necessary.
+
+RUN echo "[$0]:  Setup environment variables"
+
+ENV IDF_PATH ${BASE}/esp-idf
+RUN echo "[$0]:  export IDF_PATH=${BASE}/esp-idf"
+
+
+ENV PATH "$PATH:${BASE}/xtensa-esp32-elf/bin"
+RUN echo "[$0]:  export PATH=$PATH:${BASE}/xtensa-esp32-elf/bin"
+
+RUN echo ""
+RUN echo "[$0]:  IDF demo instructions"
+RUN echo "[$0]:  [1] cd $BASE/esp-idf-template and"
+RUN echo "[$0]:  [2] Type make menuconfig or make flash to get started"