feat: Add support for arm64 architecture docker img

.gitignore

@@ -1,4 +1,4 @@
 /.build
 /.tarballs
-pgpool2_exporter
+pgpool2_exporter*
 *.tar.gz

Dockerfile

@@ -1,14 +1,16 @@
-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
 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"]
 

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

pgpool2_exporter.go

@@ -28,7 +28,6 @@ import (
 	"fmt"
 	"math"
 	"net/url"
-	"os"
 	"regexp"
 	"strconv"
 	"sync"