Merge pull request #258 from rocky/all_tests-tweak

Check and report status of various required packages

all_tests.sh

@@ -1,10 +1,33 @@
 #!/bin/sh
 
-python3 --version
-echo "Please make sure you are using python 3.6.x"
+echo -n "Checking Python version... "
+python -c 'import sys
+print(sys.version)
+assert sys.version_info[0:2] >= (3,6), \
+"""Please make sure you are using Python 3.6.x.
+You ran with {}""".format(sys.version)' || exit $?
 
-solc --version
-echo "Please make sure you are using solc 0.4.21"
+echo "Checking solc version..."
+out=$(solc --version) || {
+    echo 2>&1 "Please make sure you have solc installed, version 0.4.21 or greater"
+
+    }
+case $out in
+    *Version:\ 0.4.2[1-9]* )
+	echo $out
+	break ;;
+    * )
+	echo $out
+	echo "Please make sure your solc version is at least 0.4.21"
+	exit 1
+	;;
+esac
+
+echo "Checking that truffle is installed..."
+if ! which truffle ; then
+    echo "Please make sure you have etherum truffle installed (npm install -g truffle)"
+    exit 2
+fi
 
 rm -rf ./tests/testdata/outputs_current/
 mkdir -p ./tests/testdata/outputs_current/