Merge pull request #28 from kkolk/master

Author: 72636c

README.md

@@ -88,8 +88,6 @@ steps:
       - docker#v3.3.0
 ```
 
-The subdirectory containing the Dockerfile is the path used for the build's context.
-
 ### Specifying a target step
 
 A [multi-stage Docker build] can be used to reduce an application container to
@@ -109,6 +107,22 @@ steps:
       - docker#v3.3.0
 ```
 
+### Specifying build context
+
+The subdirectory containing the Dockerfile is the path used for the build's context by default.
+
+The `context` property can be used to specify a different path.
+
+```yaml
+steps:
+  - command: cargo test
+    plugins:
+      - seek-oss/docker-ecr-cache#v1.8.0:
+          dockerfile: dockerfiles/test/Dockerfile
+          context: '.'
+      - docker#v3.3.0
+```
+
 ### Specifying build args
 
 [Build-time variables] are supported, either with an explicit value, or without

hooks/pre-command

@@ -14,7 +14,8 @@ target="${BUILDKITE_PLUGIN_DOCKER_ECR_CACHE_TARGET:-}"
 export_env_variable="${BUILDKITE_PLUGIN_DOCKER_ECR_CACHE_EXPORT_ENV_VARIABLE:-"BUILDKITE_PLUGIN_DOCKER_IMAGE"}"
 exec 3>&1
 tag="$(compute_tag "${docker_file}" 2>&3)"
-context="$(dirname "${docker_file}")"
+docker_file_dir="$(dirname "${docker_file}")"
+context="${BUILDKITE_PLUGIN_DOCKER_ECR_CACHE_CONTEXT:-"${docker_file_dir}"}"
 
 build_args=()
 read_build_args

plugin.yml

@@ -23,6 +23,8 @@ configuration:
       type: number
     export-env-variable:
       type: string
+    context:
+      type: string
     registry-provider:
       type: string
     gcp-project: