Supporting offline resource files

These bits add a make target for `fetch_resources`

- Parse the resources.dist file in $CHARM_ROOT
- Fetch and sha1sum the resources parsed out of resources.dist
- Print feedback about sum verification, all files isolated in `$CHARM_ROOT/resources`

Makefile

@@ -0,0 +1,28 @@
+#!/usr/bin/make
+
+all: lint unit_test
+
+
+.PHONY: clean
+clean:
+	@rm -rf .tox
+
+.PHONY: apt_prereqs
+apt_prereqs:
+	@# Need tox, but don't install the apt version unless we have to (don't want to conflict with pip)
+	@which tox >/dev/null || (sudo apt-get install -y python-pip && sudo pip install tox)
+
+.PHONY: lint
+lint: apt_prereqs
+	@tox --notest
+	@PATH=.tox/py34/bin:.tox/py35/bin flake8 $(wildcard hooks reactive lib unit_tests tests)
+	@charm proof
+
+.PHONY: unit_test
+unit_test: apt_prereqs
+	@echo Starting tests...
+	tox
+
+.PHONY: fetch_resources
+fetch_resources:
+	scripts/download_resources.sh

resources.dist

@@ -0,0 +1 @@
+etcd|2.2.3|etcd-v2.2.3-linux-amd64.tar.gz|https://github.com/coreos/etcd/releases/download/v2.2.3/etcd-v2.2.3-linux-amd64.tar.gz|208d5f05f1ef2715198904f46c7fde3f9b7bdec6

scripts/download_resources.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -e
+
+#!/bin/bash
+mkdir -p $(pwd)/resources
+
+while IFS="|" read app version file url checksum
+do
+  echo "Downloading $app Version: $version"
+  echo $url
+  echo $file
+  curl -L -v $url -o resources/$file 2>> logfile.txt
+  # make here a special case, if the file is not present
+  calculated_sum=$(sha1sum "resources/$file" | /usr/bin/cut -f 1 -d " ")
+  # compare checksum
+  case "$calculated_sum" in
+    "$checksum")
+      echo -e " \033[m\033[42m  OK  \033[0m crypto signature compared and correct.";
+	;;
+	*)
+	echo -e " \033[m\033[41m  ERROR  \033[0m cryptographic verification failed!";
+  esac
+done < "resources.dist"