fix: exposing docker socket for DinD

README.md

@@ -1,37 +1,64 @@
 # Docker Run Action
 
-This action targets a very specific use-case that is not currently supported by Github Workflows. This action gives you the capability to run built containers.
+Github Workflows already supports running on public docker images out-of-the-box (See [jobs.<jobs_id>.container](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idcontainer)).
 
-Docker already supports running commands inside a docker image. See [jobs.<jobs_id>.container](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idcontainer). But it doesn't give you a clean way to run an image from a private repo or an image built on a previous step.
+### Why use docker-run-action?
+- run on a privately-owned image.
+- run on an image built by a previous step.
+- run a specific step in docker
 
 ### Example Usage
 
-#### Standard use-case
+#### single-line command
 ```yaml
 - uses: addnab/docker-run-action@v1
   with:
     image: docker:latest
-    command: echo "hello world"
+    run: echo "hello world"
 ```
 
-### Supported Inputs
+#### multi-line commands
 ```yaml
-  image:
-    description: 'Image'
-    required: true
-  options:
-    description: 'Options'
-    required: false
-  command:
-    description: 'Command'
-    required: false
-  registry:
-    description: 'Registry'
-    required: false
-  username:
-    description: 'Username'
-    required: false
-  password:
-    description: 'Password'
-    required: false
+- uses: addnab/docker-run-action@v1
+  with:
+    image: docker:latest
+    run: |
+      echo "first line"
+      echo "second line"
+```
+
+#### run on a privately-owned image
+```yaml
+- uses: addnab/docker-run-action@v1
+  with:
+    username: ${{ secrets.DOCKER_USERNAME }}
+    password: ${{ secrets.DOCKER_PASSWORD }}
+    registry: gcr.io
+    image: test-image:latest
+    run: echo "hello world"
+```
+
+#### run on an image built by a previous step
+```yaml
+- uses: docker/build-push-action@v1
+  with:
+    repository: test-image
+    push: false
+- uses: addnab/docker-run-action@v1
+  with:
+    image: test-image:latest
+    run: echo "hello world"
+```
+
+
+#### use a specific shell (default: sh). 
+*Note: The shell must be installed in the container*
+```yaml
+- uses: addnab/docker-run-action@v1
+  with:
+    image: docker:latest
+    shell: bash
+    run: |
+      echo "first line"
+      echo "second line"
 ```

action.yml

@@ -8,9 +8,13 @@ inputs:
   options:
     description: 'Options'
     required: false
-  command:
-    description: 'Command'
+  run:
+    description: 'Run command in container'
     required: false
+  shell:
+    description: 'Use a specific shell'
+    required: false
+    default: sh
   registry:
     description: 'Registry'
     required: false

entrypoint.sh

@@ -1,7 +1,9 @@
 #!/usr/bin/env bash
 
 if [ ! -z $INPUT_USERNAME ];
-then echo $INPUT_USERNAME | docker login $INPUT_REGISTRY -u $INPUT_PASSWORD --password-stdin
+then echo $INPUT_PASSWORD | docker login $INPUT_REGISTRY -u $INPUT_USERNAME --password-stdin
 fi
 
-exec docker run $INPUT_OPTIONS $INPUT_IMAGE $INPUT_COMMAND
+echo "$INPUT_RUN" | sed -e 's/\\n/;/g' > semicolon_delimited_script
+
+exec docker run -v "/var/run/docker.sock":"/var/run/docker.sock" $INPUT_OPTIONS --entrypoint=$INPUT_SHELL $INPUT_IMAGE -c "`cat semicolon_delimited_script`"