Merge pull request #34 from itamargiv/feature/recursive-dir-check

Feature: Recursive dir check - Lint multiple files

README.md

@@ -26,6 +26,8 @@ steps:
 | Name              | Description                               | Default          |
 |------------------ |------------------------------------------ |----------------- |
 | dockerfile        | The path to the Dockerfile to be tested   | ./Dockerfile     |
+| recursive         | Search for specified dockerfile           | false            | 
+|                   | recursively, from the project root        |                  |
 | format            | The output format. One of [tty \| json \| | tty              |
 |                   | checkstyle \| codeclimate \|              |                  |
 |                   | gitlab_codeclimate]                       |                  |

action.yml

@@ -6,6 +6,10 @@ inputs:
     required: false
     description: 'The path to the Dockerfile to lint'
     default: 'Dockerfile'
+  recursive:
+    required: false
+    description: 'Search for specified dockerfile recursively, from the project root'
+    default: 'false'
   format:
     required: false
     description: |
@@ -39,6 +43,7 @@ runs:
   env:
     HADOLINT_CONFIG: ${{ inputs.config }}
     HADOLINT_IGNORE: ${{ inputs.ignore }}
+    HADOLINT_RECURSIVE: ${{ inputs.recursive }}
 branding:
   icon: 'layers'
   color: 'purple'

hadolint.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # The problem-matcher definition must be present in the repository
 # checkout (outside the Docker container running hadolint). We create
@@ -27,5 +27,14 @@ for i in $HADOLINT_IGNORE; do
   HADOLINT_IGNORE_CMDLINE="${HADOLINT_IGNORE_CMDLINE} --ignore=${i}"
 done
 
+if [ "$HADOLINT_RECURSIVE" = "true" ]; then
+  shopt -s globstar
+
+  filename="${!#}"
+  flags="${@:1:$#-1}"
+
+  hadolint $HADOLINT_IGNORE_CMDLINE $HADOLINT_CONFIG $flags **/$filename
+else
   # shellcheck disable=SC2086
   hadolint $HADOLINT_IGNORE_CMDLINE $HADOLINT_CONFIG "$@"
+fi