Merge pull request #31 from buildkite-plugins/toote_s3_folders

S3 folder caching

Author: pzeballos

README.md

@@ -13,7 +13,7 @@ steps:
   - label: ':nodejs: Install dependencies'
     command: npm ci
     plugins:
-      - cache#v0.3.1:
+      - cache#v0.3.2:
           manifest: package-lock.json
           path: node_modules
           restore: file
@@ -114,7 +114,7 @@ steps:
   - label: ':nodejs: Install dependencies'
     command: npm ci 
     plugins:
-      - cache#v0.3.1:
+      - cache#v0.3.2:
           manifest: package-lock.json
           path: node_modules
           restore: pipeline
@@ -123,7 +123,7 @@ steps:
   - label: ':test_tube: Run tests'
     command: npm test # does not save cache, not necessary
     plugins:
-      - cache#v0.3.1:
+      - cache#v0.3.2:
           manifest: package-lock.json
           path: node_modules
           restore: file
@@ -132,7 +132,7 @@ steps:
     if: build.branch == "master"
     command: npm run deploy
     plugins:
-      - cache#v0.3.1:
+      - cache#v0.3.2:
           manifest: package-lock.json
           path: node_modules
           restore: file

backends/cache_s3

@@ -27,7 +27,7 @@ save_cache() {
 
 exists_cache() {
   if [ -z "$1" ]; then exit 1; fi
-  aws s3api head-object --bucket "${BUILDKITE_PLUGIN_S3_CACHE_BUCKET}" --key "$(build_key "$1")"
+  aws s3api list-objects-v2 --bucket "${BUILDKITE_PLUGIN_S3_CACHE_BUCKET}" --prefix "$(build_key "$1")" --max-items 1
 }
 
 OPCODE="$1"