Move the default Yarn and npm cache directories to a tmp dir (#459)

* Move the default Yarn cache directory to a tmp dir
* Move the default npm cache directory to a tmp dir

bin/compile

@@ -20,6 +20,10 @@ ENV_DIR=${3:-}
 BP_DIR=$(cd $(dirname ${0:-}); cd ..; pwd)
 STDLIB_FILE=$(mktemp -t stdlib.XXXXX)
 
+### Configure package manager cache directories
+[ ! "$YARN_CACHE_FOLDER" ] && YARN_CACHE_FOLDER=$(mktemp -d -t yarncache.XXXXX)
+[ ! "$NPM_CONFIG_CACHE" ] && NPM_CONFIG_CACHE=$(mktemp -d -t npmcache.XXXXX)
+
 ### Load dependencies
 
 curl --silent --retry 5 --retry-max-time 15 'https://lang-common.s3.amazonaws.com/buildpack-stdlib/v7/stdlib.sh' > "$STDLIB_FILE"

test/fixtures/npm5/package-lock.json

+{
+  "name": "yarn",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "dependencies": {
+    "lodash": {
+      "version": "4.17.4",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
+      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
+    }
+  }
+}

test/fixtures/npm5/package.json

+{
+  "name": "yarn",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "engines": {
+    "npm": "5.3.0"
+  },
+  "dependencies": {
+    "lodash": "^4.16.4"
+  }
+}

test/run

@@ -57,6 +57,31 @@ testYarn() {
   assertCapturedSuccess
 }
 
+testYarnCacheDirectory() {
+  local cache=$(mktmpdir)
+  local env_dir=$(mktmpdir)
+  local cache_dir=$(mktmpdir)
+  echo "${cache_dir}/yarn"> "$env_dir"/YARN_CACHE_FOLDER
+  compile "yarn" $cache $env_dir
+  # These will be created if yarn is using the directory for its cache
+  assertDirectoryExists ${cache_dir}/yarn
+  assertDirectoryExists ${cache_dir}/yarn/v1
+  assertDirectoryExists ${cache_dir}/yarn/v1/npm-lodash-4.16.4-01ce306b9bad1319f2a5528674f88297aeb70127
+  assertCapturedSuccess
+}
+
+testNpm5CacheDirectory() {
+  local cache=$(mktmpdir)
+  local env_dir=$(mktmpdir)
+  local cache_dir=$(mktmpdir)
+  echo "${cache_dir}/npm"> "$env_dir"/NPM_CONFIG_CACHE
+  compile "npm5" $cache $env_dir
+  # These will be created if npm is using the directory for its cache
+  assertDirectoryExists ${cache_dir}/npm
+  assertDirectoryExists ${cache_dir}/npm/_cacache
+  assertCapturedSuccess
+}
+
 testBuildWithCache() {
   cache=$(mktmpdir)
 
@@ -682,6 +707,7 @@ testMultiExport() {
   assertCapturedSuccess
 }
 
+
 # Utils
 
 pushd $(dirname 0) >/dev/null
@@ -740,4 +766,13 @@ assertFile() {
   assertEquals "$1" "$(cat ${compile_dir}/$2)"
 }
 
+assertDirectoryExists() {
+  if [[ ! -e "$1" ]]; then
+    fail "$1 does not exist"
+  fi
+  if [[ ! -d $1 ]]; then
+    fail "$1 is not a directory"
+  fi
+}
+
 source $(pwd)/test/shunit2