From 0f6717adad3ccac2df01ad06cb9fe1effa9845a7 Mon Sep 17 00:00:00 2001
From: rockstardev <rockstardev@users.noreply.github.com>
Date: Sun, 25 Nov 2018 23:37:12 -0600
Subject: [PATCH] Docker gen multiarch images

---
 .github/workflows/build-publish.yml | 13 +++----------
 internal/template/functions.go      | 10 ++++++++++
 internal/template/groupby.go        |  4 +++-
 internal/template/template.go       | 17 +++++++++++++++++
 4 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/.github/workflows/build-publish.yml b/.github/workflows/build-publish.yml
index eb68cb2..9af34b4 100644
--- a/.github/workflows/build-publish.yml
+++ b/.github/workflows/build-publish.yml
@@ -2,18 +2,13 @@ name: Build and publish Docker images
 
 on:
   workflow_dispatch:
-  schedule:
-    - cron: "0 0 * * 1"
   push:
-    branches:
-      - main
     tags:
       - "*.*.*"
     paths:
       - ".dockerignore"
       - ".github/workflows/build-publish.yml"
       - "Dockerfile"
-      - "Dockerfile.debian"
       - "go.mod"
       - "go.sum"
       - "**.go"
@@ -23,7 +18,7 @@ jobs:
     name: Build and publish image
     strategy:
       matrix:
-        base: [alpine, debian]
+        base: [alpine]
     runs-on: ubuntu-latest
 
     steps:
@@ -41,9 +36,7 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: |
-            ghcr.io/nginx-proxy/docker-gen
-            nginxproxy/docker-gen
-            jwilder/docker-gen
+            btcpayserver/docker-gen
           tags: |
             type=semver,pattern={{version}},enable=${{ matrix.base == 'alpine' }}
             type=semver,pattern={{major}}.{{minor}},enable=${{ matrix.base == 'alpine' }}
@@ -82,7 +75,7 @@ jobs:
         with:
           context: .
           build-args: DOCKER_GEN_VERSION=${{ steps.docker-gen_version.outputs.VERSION }}
-          platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           file: Dockerfile.${{ matrix.base }}
           push: true
           tags: ${{ steps.docker_meta.outputs.tags }}
diff --git a/internal/template/functions.go b/internal/template/functions.go
index 88c7003..ddf98a4 100644
--- a/internal/template/functions.go
+++ b/internal/template/functions.go
@@ -125,6 +125,16 @@ func coalesce(input ...interface{}) interface{} {
 	return nil
 }
 
+// coalesceempty returns the first non nil argument or empty
+func coalesceempty(input ...interface{}) interface{} {
+	for _, v := range input {
+		if v != nil && len(fmt.Sprintf("%v", v)) > 0 {
+			return v
+		}
+	}
+	return nil
+}
+
 // trimPrefix returns a string without the prefix, if present
 func trimPrefix(prefix, s string) string {
 	return strings.TrimPrefix(s, prefix)
diff --git a/internal/template/groupby.go b/internal/template/groupby.go
index b7063b9..4692379 100644
--- a/internal/template/groupby.go
+++ b/internal/template/groupby.go
@@ -40,7 +40,9 @@ func groupByMulti(entries interface{}, key, sep string) (map[string][]interface{
 	return generalizedGroupByKey("groupByMulti", entries, key, func(groups map[string][]interface{}, value interface{}, v interface{}) {
 		items := strings.Split(value.(string), sep)
 		for _, item := range items {
-			groups[item] = append(groups[item], v)
+			if item != "" {
+				groups[item] = append(groups[item], v)
+			}
 		}
 	})
 }
diff --git a/internal/template/template.go b/internal/template/template.go
index e005d12..fec399f 100644
--- a/internal/template/template.go
+++ b/internal/template/template.go
@@ -23,6 +23,21 @@ import (
 	"github.com/nginx-proxy/docker-gen/internal/utils"
 )
 
+func read(path string) (string, error) {
+	_, err := os.Stat(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return "", nil
+		}
+		return "", err
+	}
+	b, err := os.ReadFile(path)
+	if err != nil {
+        return "", err
+    }
+	return string(b), nil
+}
+
 func getArrayValues(funcName string, entries interface{}) (*reflect.Value, error) {
 	entriesVal := reflect.ValueOf(entries)
 
@@ -61,10 +76,12 @@ func newTemplate(name string) *template.Template {
 	tmpl.Funcs(sprig.TxtFuncMap()).Funcs(template.FuncMap{
 		"closest":                arrayClosest,
 		"coalesce":               coalesce,
+		"coalesceempty":          coalesceempty,
 		"contains":               contains,
 		"dir":                    dirList,
 		"eval":                   eval,
 		"exists":                 utils.PathExists,
+		"read":                   read,
 		"groupBy":                groupBy,
 		"groupByKeys":            groupByKeys,
 		"groupByMulti":           groupByMulti,