From 96a222ef481420743894a3caa4b32704db974542 Mon Sep 17 00:00:00 2001
From: exfly <exflyg@gmail.com>
Date: Wed, 10 Jan 2024 10:28:23 +0800
Subject: [PATCH] feat: multiarch docker image

---
 .gitignore          | 2 +-
 Dockerfile          | 6 ++++--
 Makefile            | 6 ++++--
 pgpool2_exporter.go | 1 -
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index 4d551bb..5889078 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /.build
 /.tarballs
-pgpool2_exporter
+pgpool2_exporter*
 *.tar.gz
diff --git a/Dockerfile b/Dockerfile
index ec1552e..2875719 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,8 @@
-FROM quay.io/prometheus/busybox:latest
+FROM --platform=$BUILDPLATFORM quay.io/prometheus/busybox:latest
 LABEL maintainer="Bo Peng <pengbo@sraoss.co.jp>"
 
+ARG TARGETARCH
+
 ENV POSTGRES_USERNAME postgres
 ENV POSTGRES_PASSWORD postgres
 ENV POSTGRES_DATABASE postgres
@@ -8,7 +10,7 @@ ENV PGPOOL_SERVICE localhost
 ENV PGPOOL_SERVICE_PORT 9999
 ENV SSLMODE disable
 
-COPY pgpool2_exporter /bin/pgpool2_exporter
+COPY pgpool2_exporter-$TARGETARCH /bin/pgpool2_exporter
 
 CMD ["/bin/sh", "-c", "export DATA_SOURCE_USER=\"${POSTGRES_USERNAME}\" ; export DATA_SOURCE_PASS=\"${POSTGRES_PASSWORD}\" ; export DATA_SOURCE_URI=\"${PGPOOL_SERVICE}:${PGPOOL_SERVICE_PORT}/${POSTGRES_DATABASE}?sslmode=${SSLMODE}\" ; /bin/pgpool2_exporter"]
 
diff --git a/Makefile b/Makefile
index 8f45c06..541234f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 GO     := go
 GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
+GOARCH ?= amd64
 
 PROMU       ?= $(GOPATH)/bin/promu
 pkgs         = $(shell $(GO) list ./... | grep -v /vendor/)
@@ -14,7 +15,8 @@ DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
 
 build: promu
 	@echo ">> building binaries"
-	@$(PROMU) build --prefix $(PREFIX)
+	@$(PROMU) build -v --prefix $(PREFIX)
+	mv pgpool2_exporter pgpool2_exporter-$(GOARCH)
 
 crossbuild: promu
 	@echo ">> building cross-platform binaries"
@@ -35,6 +37,6 @@ tarballs: crossbuild
 
 docker:
 	@echo ">> building docker image"
-	@docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
+	@docker buildx build --push --platform linux/amd64,linux/arm64 -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
 
 .PHONY: promu build crossbuild tarball tarballs docker
diff --git a/pgpool2_exporter.go b/pgpool2_exporter.go
index 5774764..a2a701d 100644
--- a/pgpool2_exporter.go
+++ b/pgpool2_exporter.go
@@ -28,7 +28,6 @@ import (
 	"fmt"
 	"math"
 	"net/url"
-	"os"
 	"regexp"
 	"strconv"
 	"sync"