feat: allow providing options to bluebuild build command (#63)

* feat: allow providing options to `bluebuild build` command

* chore: wording changes

* chore: wording changes, typo fix

* fix: proper shebang, stricter script options

---------

Co-authored-by: xyny <60004820+xynydev@users.noreply.github.com>

action.yml

@@ -69,9 +69,16 @@ inputs:
   squash:
     description: |
       Uses buildah to squash the build's layers into a single layer. Use of this option
-      disables cache.
+      disables cache. Conflicts with adding --build-driver or --squash to the build opts.
     required: false
     default: 'false'
+  build_opts:
+    description: |
+      Provide options to the call to the BlueBuild CLI build command. If you use this with
+      the squash input set to true and provide either of the --build-driver or --squash flags
+      an error will occur and the action will not run.
+    required: false
+    default: ' '
   working_directory:
     description: |
       Changes working directory for whole build.
@@ -89,6 +96,12 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - name: Validate inputs
+      shell: bash
+      run: "${{ github.action_path }}/build_opts_check.sh"
+      env:
+        SQUASH_INPUT_VALUE: "${{ inputs.squash }}"
+        BUILD_OPTS: "${{ inputs.build_opts }}"
     # building custom images might take a lot of space, 
     # so it's best to remove unneeded softawre
     - name: Maximize build space
@@ -189,9 +202,8 @@ runs:
         RECIPE_PATH: ${{ steps.build_vars.outputs.recipe_path }}
         RUST_LOG_STYLE: always
         CLICOLOR_FORCE: '1'
+        BUILD_OPTS: ${{ inputs.build_opts }}
       run: |
-        BUILD_OPTS=""
-
         if [ "${{ inputs.squash }}" = "true" ]; then
           BUILD_OPTS="--build-driver podman --squash $BUILD_OPTS"
         fi

build_opts_check.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Expected env vars:
+# SQUASH_INPUT_VALUE
+# BUILD_OPTS
+
+if [ "$SQUASH_INPUT_VALUE" != "true" ]; then
+  if grep -qE '(-B)|(--build-driver)' <<< "$BUILD_OPTS"; then
+    echo 'Cannot provide --build-driver in build_opts while squash is set to true.'
+    exit 1
+  fi
+
+  if grep -qE '(-s)|(--squash)' <<< "$BUILD_OPTS"; then
+    echo 'Cannot provide --squash in build_opts while squash is set to true.'
+    exit 1
+  fi
+fi
+
+if grep -qE '(-p)|(--push)' <<< "$BUILD_OPTS"; then
+  echo 'Please do not add --push to build_opts, as the action already provides that argument.'
+  exit 1
+fi
+
+exit 0