finish up the out script

also add a `run` script for testing purposes

.env.example

@@ -0,0 +1,6 @@
+# http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-set-up.html#cli-signup
+AWS_ACCESS_KEY_ID=<key>
+AWS_SECRET_ACCESS_KEY=<secret>
+
+# exclude the `s3://` prefix/protocol
+S3_BUCKET=<bucket name>

.gitignore

@@ -0,0 +1 @@
+.env

Dockerfile

@@ -6,5 +6,3 @@ RUN pip install --upgrade pip
 RUN pip install --upgrade awscli
 
 ADD assets/ /opt/resource/
-
-CMD echo Simple S3 Resource ready.

README.md

@@ -1,10 +1,17 @@
 # Simple S3 Resource for [Concourse CI](http://concourse.ci)
 
+Resource to upload files to S3. Unlike the [the official S3 Resource](https://github.com/concourse/s3-resource), this Resource doesn't care about files being versioned.
+
+## Usage
+
+TODO
+
 ## Development
 
 Requires Docker.
 
 ```bash
-docker build -t s3-resource-simple .
+cp .env.example .env
-docker run --rm s3-resource-simple /opt/resource/out
+# modify .env
+./script/run /full/path/to/dir/or/file
 ```

assets/out

@@ -1,6 +1,26 @@
 #!/bin/sh
 
+# https://github.com/concourse/git-resource/blob/6fcfbd4/assets/out#L4-L16
 set -e
-set -x
 
-echo foo
+exec 3>&1 # make stdout available as fd 3 for the result
+exec 1>&2 # redirect all output to stderr for logging
+
+source=$1
+
+if [ -z "$source" ]; then
+  echo "usage: $0 <path/to/volume>"
+  exit 1
+fi
+#######################################
+
+# credentials are provided via environment variables
+# http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html#cli-environment
+aws s3 sync $source "s3://$S3_BUCKET"
+
+# use the current UNIX time as the version
+# https://github.com/concourse/git-resource/blob/6fcfbd4/assets/out#L133-L136
+jq -n "{
+  version: {
+    timestamp: $(date +%s)}
+}" >&3

script/run

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+set -e
+set -x
+
+source=$1
+
+if [ -z "$source" ]; then
+  echo "usage: $0 </full/path/to/dir/or/file>"
+  exit 1
+fi
+
+docker build -t s3-resource-simple .
+
+docker run \
+  --env-file .env \
+  --rm \
+  -v $source:/tmp/input \
+  s3-resource-simple \
+  /opt/resource/out /tmp/input