attempt to support multiple architectures

entrypoint.sh

@@ -2,25 +2,25 @@
 
 set -e
 
-if ! command -v nixpacks &> /dev/null; then
-    echo "Installing Nixpacks..."
-    curl -sSL https://nixpacks.com/install.sh | bash
+if ! command -v nixpacks &>/dev/null; then
+  echo "Installing Nixpacks..."
+  curl -sSL https://nixpacks.com/install.sh | bash
 fi
 
 BUILD_CMD="nixpacks build $INPUT_CONTEXT"
 
 # Incorporate provided input parameters from actions.yml into the Nixpacks build command
 if [ -n "${INPUT_TAGS}" ]; then
-    read -ra TAGS <<< "$(echo "$INPUT_TAGS" | tr ',\n' ' ')"
+  read -ra TAGS <<<"$(echo "$INPUT_TAGS" | tr ',\n' ' ')"
 else
-    # if not tags are provided, assume ghcr.io as the default registry
-    echo "No tags provided. Defaulting to ghcr.io registry."
-    BUILD_DATE_TIMESTAMP=$(date +%s)
-    TAGS=("ghcr.io/$GITHUB_REPOSITORY:$GIT_SHA" "ghcr.io/$GITHUB_REPOSITORY:latest" "ghcr.io/$GITHUB_REPOSITORY:$BUILD_DATE_TIMESTAMP")
+  # if not tags are provided, assume ghcr.io as the default registry
+  echo "No tags provided. Defaulting to ghcr.io registry."
+  BUILD_DATE_TIMESTAMP=$(date +%s)
+  TAGS=("ghcr.io/$GITHUB_REPOSITORY:$GIT_SHA" "ghcr.io/$GITHUB_REPOSITORY:latest" "ghcr.io/$GITHUB_REPOSITORY:$BUILD_DATE_TIMESTAMP")
 fi
 
 if [ -n "${INPUT_LABELS}" ]; then
-    read -ra LABELS <<< "$(echo "$INPUT_LABELS" | tr ',\n' ' ')"
+  read -ra LABELS <<<"$(echo "$INPUT_LABELS" | tr ',\n' ' ')"
 fi
 
 LABELS+=("org.opencontainers.image.source=$GITHUB_REPOSITORY_URL")
@@ -32,42 +32,41 @@ LABELS+=("org.opencontainers.image.created=\"$(date -u +"%Y-%m-%dT%H:%M:%SZ")\""
 # asdf-devcontainer/Dockerfile:9:7:LABEL org.opencontainers.image.authors="Michael Bianco <[email protected]>" \
 
 for label in "${LABELS[@]}"; do
-    BUILD_CMD="$BUILD_CMD --label $label"
+  BUILD_CMD="$BUILD_CMD --label $label"
 done
 
 if [ -n "${INPUT_PKGS}" ]; then
-    read -ra PKGS_ARR <<< "$(echo "$INPUT_PKGS" | tr ',\n' ' ')"
-    BUILD_CMD="$BUILD_CMD --pkgs '${PKGS_ARR[*]}'"
+  read -ra PKGS_ARR <<<"$(echo "$INPUT_PKGS" | tr ',\n' ' ')"
+  BUILD_CMD="$BUILD_CMD --pkgs '${PKGS_ARR[*]}'"
 fi
 
 if [ -n "${INPUT_APT}" ]; then
-    read -ra APT_ARR <<< "$(echo "$INPUT_APT" | tr ',\n' ' ')"
-    BUILD_CMD="$BUILD_CMD --apt '${APT_ARR[*]}'"
+  read -ra APT_ARR <<<"$(echo "$INPUT_APT" | tr ',\n' ' ')"
+  BUILD_CMD="$BUILD_CMD --apt '${APT_ARR[*]}'"
 fi
 
 # Include environment variables in the build command
 if [ -n "${INPUT_ENV}" ]; then
-    IFS=',' read -ra ENVS <<< "$INPUT_ENV"
-    for env_var in "${ENVS[@]}"; do
-        BUILD_CMD="$BUILD_CMD --env $env_var"
-    done
+  IFS=',' read -ra ENVS <<<"$INPUT_ENV"
+  for env_var in "${ENVS[@]}"; do
+    BUILD_CMD="$BUILD_CMD --env $env_var"
+  done
 fi
 
 if [ -n "${INPUT_PLATFORMS}" ]; then
-    read -ra PLATFORMS <<< "$(echo "$INPUT_PLATFORMS" | tr ',\n' ' ')"
+  read -ra PLATFORMS <<<"$(echo "$INPUT_PLATFORMS" | tr ',\n' ' ')"
 fi
 
 if [ "${#PLATFORMS[@]}" -gt 1 ] && [ "$INPUT_PUSH" != "true" ]; then
-    echo "Multi-platform builds *must* be pushed to a registry. Please set 'push: true' in your action configuration or do a single architecture build."
-    exit 1
+  echo "Multi-platform builds *must* be pushed to a registry. Please set 'push: true' in your action configuration or do a single architecture build."
+  exit 1
 fi
 
 function build_and_push() {
-  local platform=$1
   local build_cmd=$BUILD_CMD
 
-  if [ -n "$platform" ]; then
-    build_cmd="$build_cmd --platform $platform"
+  if [ -n "$PLATFORMS" ]; then
+    build_cmd="$build_cmd --platform $PLATFORMS"
   fi
 
   for tag in "${TAGS[@]}"; do
@@ -90,12 +89,35 @@ function build_and_push() {
   fi
 }
 
+function build_and_push_multiple_architectures() {
+  for platform in "${PLATFORMS[@]}"; do
+    local build_cmd=$BUILD_CMD
+    local temporary_image_name=${GITHUB_REPOSITORY}-local-build:$platform
+
+    build_cmd="$build_cmd --platform $platform"
+    build_cmd="$build_cmd --tag $temporary_image_name"
+
+    echo "Executing Nixpacks build command:"
+    echo "$build_cmd"
+
+    eval "$build_cmd"
+  done
+
+  local manifest_list=$(for PLATFORM in "${PLATFORMS[@]}"; do echo "$IMAGE_NAME:temp-$PLATFORM"; done)
+
+  # now, with all architectures built locally, we can construct a manifest and push to the registry
+  for tag in "${TAGS[@]}"; do
+    echo "Creating manifest and pushing for tag $tag..."
+
+    docker manifest create "$tag" "$manifest_list"
+    docker manifest push "$tag"
+  done
+}
+
 if [ "${#PLATFORMS[@]}" -gt 1 ]; then
-    echo "Multi platform builds not supported yet"
-    exit 1
-    # for platform in "${PLATFORMS[@]}"; do
+  build_and_push_multiple_architectures
 elif [ -n "$PLATFORMS" ]; then
-    build_and_push "$PLATFORMS"
+  build_and_push
 fi
 
 echo "Nixpacks Build & Push completed successfully."