chore: add prerequisite check before build

CONTRIBUTING.md

@@ -78,7 +78,7 @@ you need to have the following SDKs and tools locally:
   - We recommend using a version in [Active LTS](https://nodejs.org/en/about/releases/)
   - ⚠️ versions `13.0.0` to `13.6.0` are not supported due to compatibility issues with our dependencies.
 - [Yarn >= 1.19.1](https://yarnpkg.com/lang/en/docs/install)
-- [Java OpenJDK 8](https://docs.aws.amazon.com/corretto/latest/corretto-8-ug/downloads-list.html)
+- [Java >= OpenJDK 8](https://docs.aws.amazon.com/corretto/latest/corretto-8-ug/downloads-list.html)
 - [Apache Maven](http://maven.apache.org/install.html)
 - [.NET Core SDK 3.1](https://www.microsoft.com/net/download)
 - [Python 3.6.5](https://www.python.org/downloads/release/python-365/)
@@ -89,7 +89,6 @@ The basic commands to get the repository cloned and built locally follow:
 ```console
 $ git clone https://github.com/aws/aws-cdk.git
 $ cd aws-cdk
-$ yarn install
 $ yarn build
 ```
 

build.sh

@@ -38,8 +38,12 @@ fail() {
   exit 1
 }
 
+# Check for secrets that should not be committed
 /bin/bash ./git-secrets-scan.sh
 
+# Verify dependencies before starting the build
+/bin/bash ./check-dependencies.sh
+
 # Prepare for build with references
 /bin/bash scripts/generate-aggregate-tsconfig.sh > tsconfig.json
 

check-dependencies.sh

@@ -0,0 +1,161 @@
+#!/bin/bash
+set -euo pipefail
+
+# Testing with this to simulate different installed apps:
+# docker run -it -v ~/Source/aws-cdk:/var/cdk ubuntu bash
+
+# Note: Don't use \d in regex, it doesn't work on Macs without GNU tools installed
+# Use [0-9] instead
+
+app=""
+app_min=""
+app_v=""
+
+die() { echo "$*" 1>&2 ; exit 1; }
+wrong_version() { echo "Found $app version $app_v. Install $app >= $app_min" 1>&2; exit 1; }
+
+check_which() {
+    app=$1
+    min=$2
+
+    echo -e "Checking if $app is installed... \c"
+
+    w=$(which ${app}) || w=""
+
+    if [ -z $w ] || [ $w == "$app not found" ]
+    then
+        die "Missing dependency: $app. Install $app >= $min"
+    else
+        echo "Ok"
+    fi
+}
+
+# [Node.js >= 10.13.0]
+#   ⚠️ versions `13.0.0` to `13.6.0` are not supported due to compatibility issues with our dependencies.
+app="node"
+app_min="v10.13.0"
+check_which $app $app_min
+app_v=$(node --version)
+
+# Check for version 10.*.* - 29.*.*
+echo -e "Checking node version... \c"
+if [ $(echo $app_v | grep -c -E "v[12][0-9]\.[0-9]+\.[0-9]+") -eq 1 ]
+then    
+    # Check for version 13.0 to 13.6
+    if [ $(echo $app_v | grep -c -E "v13\.[0-6]\.[0-9]+") -eq 1 ]
+    then
+        die "node versions 13.0.0 to 13.6.0 are not supported due to compatibility issues with our dependencies."
+    else
+        # Check for version < 10.13
+        if [ $(echo $app_v | grep -c -E "v10\.([0-9]|1[0-2])\.[0-9]+") -eq 1 ]
+        then   
+            wrong_version
+        else
+            echo "Ok"
+        fi
+    fi
+else    
+    echo "Not 12"
+    wrong_version
+fi
+
+# TODO - Should we switch to JS here instead of bash since we know node is installed?
+# We'd still need to shell out to check each app...
+
+# [Yarn >= 1.19.1]
+app="yarn"
+app_min="1.19.1"
+check_which $app $app_min
+app_v=$(${app} --version)
+echo -e "Checking yarn version... \c"
+if [ $(echo $app_v | grep -c -E "1\.(19|2[0-9])\.[0-9]+") -eq 1 ]
+then   
+    echo "Ok"
+else
+    wrong_version
+fi
+
+# [Java OpenJDK 8]
+
+# Follow "More Info" on a new Mac when trying javac, install latest Oracle:
+# javac 14.0.1
+
+# apt install default-jdk on Ubuntu
+# javac 11.0.7
+
+# Install Coretto 8 from Amazon web site
+# javac --version fails
+# javac -version
+# javac 1.8.0_252
+# Old javac versions output version to stderr... why
+
+app="javac"
+app_min="1.8.0"
+check_which $app $app_min
+app_v=$(${app} -version 2>&1)
+echo -e "Checking javac version... \c"
+# 1.8
+if [ $(echo $app_v | grep -c -E "1\.8\.[0-9].*") -eq 1 ]
+then   
+    echo "Ok"
+else
+    # 11 or 14
+    if [ $(echo $app_v | grep -c -E "1[14]\.[0-9]\.[0-9].*") -eq 1 ]
+    then    
+        echo "Ok"
+    else
+        wrong_version
+    fi
+fi
+
+# [Apache Maven]
+app="mvn"
+app_min="3.6.0"
+check_which $app $app_min
+app_v=$(${app} --version)
+echo -e "Checking mvn version... \c"
+if [ $(echo $app_v | grep -c -E "3\.[6789]\.[0-9].*") -eq 1 ]
+then   
+    echo "Ok"
+else
+    wrong_version
+fi
+
+# [.NET Core SDK 3.1]
+app="dotnet"
+app_min="3.1.0"
+check_which $app $app_min
+app_v=$(${app} --version)
+echo -e "Checking $app version... \c"
+if [ $(echo $app_v | grep -c -E "3\.1\.[0-9].*") -eq 1 ]
+then   
+    echo "Ok"
+else
+    wrong_version
+fi
+
+# [Python 3.6.5]
+app="python3"
+app_min="3.6.5"
+check_which $app $app_min
+app_v=$(${app} --version)
+echo -e "Checking $app version... \c"
+if [ $(echo $app_v | grep -c -E "3\.[6789]\.[0-9].*") -eq 1 ]
+then   
+    echo "Ok"
+else
+    wrong_version
+fi
+
+# [Ruby 2.5.1]
+app="ruby"
+app_min="2.5.1"
+check_which $app $app_min
+app_v=$(${app} --version)
+echo -e "Checking $app version... \c"
+if [ $(echo $app_v | grep -c -E "2\.[56789]\.[0-9].*") -eq 1 ]
+then   
+    echo "Ok"
+else
+    wrong_version
+fi