Refactor BK verify script so we can reuse bundle caching across projects easily.

Signed-off-by: Ryan Davis <zenspider@chef.io>

.expeditor/buildkite/cache_support.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+set -ue
+
+S3_URL="s3://public-cd-buildkite-cache/${BUILDKITE_PIPELINE_SLUG}/${BUILDKITE_LABEL}"
+
+pull_s3_file() {
+    aws s3 cp "${S3_URL}/$1" "$1" || echo "Could not pull $1 from S3"
+}
+
+push_s3_file() {
+    if [ -f "$1" ]; then
+        aws s3 cp "$1" "${S3_URL}/$1" || echo "Could not push $1 to S3 for caching."
+    fi
+}
+
+install_cache_deps() {
+    apt-get update -y
+
+    if [ -n "${1:-}" ]; then
+        apt-get install "$@" -y
+    fi
+
+    if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
+        apt-get install awscli -y
+    fi
+}
+
+pull_bundle() {
+    if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
+        pull_s3_file "bundle.tar.gz"
+        pull_s3_file "bundle.sha256"
+
+        if [ -f bundle.tar.gz ]; then
+            tar -xzf bundle.tar.gz
+            mv Gemfile.lock Gemfile.lock.old || true
+        fi
+
+        if [ -n "${RESET_BUNDLE_CACHE:-}" ]; then
+            rm bundle.sha256
+        fi
+    fi
+}
+
+push_bundle() {
+    if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
+        if test -f bundle.sha256 && shasum --check bundle.sha256 --status; then
+            echo "Bundled gems have not changed. Skipping upload to s3"
+        else
+            echo "Bundled gems have changed. Uploading to s3"
+            diff -u Gemfile.lock.old Gemfile.lock || true
+            shasum -a 256 Gemfile.lock > bundle.sha256
+            tar -czf bundle.tar.gz Gemfile.lock vendor/
+            push_s3_file bundle.tar.gz
+            push_s3_file bundle.sha256
+        fi
+    fi
+}

.expeditor/buildkite/verify.sh

@@ -1,29 +1,11 @@
 #!/bin/bash
 
-set -ue
-
 echo "--- dependencies"
-export LANG=C.UTF-8 LANGUAGE=C.UTF-8
+. .expeditor/buildkite/cache_support.sh
-S3_URL="s3://public-cd-buildkite-cache/${BUILDKITE_PIPELINE_SLUG}/${BUILDKITE_LABEL}"
+install_cache_deps sudo
-
-pull_s3_file() {
-    aws s3 cp "${S3_URL}/$1" "$1" || echo "Could not pull $1 from S3"
-}
-
-push_s3_file() {
-    if [ -f "$1" ]; then
-        aws s3 cp "$1" "${S3_URL}/$1" || echo "Could not push $1 to S3 for caching."
-    fi
-}
-
-apt-get update -y
-apt-get install sudo -y
-
-if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
-    apt-get install awscli -y
-fi
 
 echo "--- setting up user"
+export LANG=C.UTF-8 LANGUAGE=C.UTF-8
 useradd -m -U --uid 2000 normal
 echo "normal ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers.d/normal
 
@@ -35,40 +17,19 @@ uname -a
 gem env
 bundle --version
 
-echo "--- bundle install"
+echo "--- pull bundle cache"
-if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
+pull_bundle
-    pull_s3_file "bundle.tar.gz"
-    pull_s3_file "bundle.sha256"
-
-    if [ -f bundle.tar.gz ]; then
-        tar -xzf bundle.tar.gz
-        mv Gemfile.lock Gemfile.lock.old || true
-    fi
-
-    if [ -n "${RESET_BUNDLE_CACHE:-}" ]; then
-        rm bundle.sha256
-    fi
-fi
 
+echo "--- bundle"
 bundle config --local path vendor/bundle
 bundle install --jobs=7 --retry=3 --without tools maintenance deploy
 
-echo "--- bundle cache"
+echo "--- push bundle cache"
-if [ -z "${SKIP_BUNDLE_CACHE:-}" ]; then
+push_bundle
-    if test -f bundle.sha256 && shasum --check bundle.sha256 --status; then
-        echo "Bundled gems have not changed. Skipping upload to s3"
-    else
-        echo "Bundled gems have changed. Uploading to s3"
-        diff -u Gemfile.lock.old Gemfile.lock || true
-        shasum -a 256 Gemfile.lock > bundle.sha256
-        tar -czf bundle.tar.gz Gemfile.lock vendor/
-        push_s3_file bundle.tar.gz
-        push_s3_file bundle.sha256
-    fi
-fi
 
 echo "+++ bundle exec rake ${RAKE_TASK:-}"
 # TODO: run this as non-root:
 # chown -R normal:normal /home/normal /workdir
 # su normal -c "bundle exec rake ${RAKE_TASK:-}"
+# shellcheck disable=SC2086
 bundle exec rake ${RAKE_TASK:-}