Dockerfile

FROM osgeo/gdal:alpine-small-latest

RUN apk add --no-cache \
	ca-certificates

# set up nsswitch.conf for Go's "netgo" implementation
# - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
# - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf

ENV PATH /usr/local/go/bin:$PATH

ENV GOLANG_VERSION 1.15.3

RUN set -eux; \
	apk add --no-cache --virtual .build-deps \
	bash \
	gcc \
	gnupg \
	go \
	musl-dev \
	openssl \
	; \
	export \
	# set GOROOT_BOOTSTRAP such that we can actually build Go
	GOROOT_BOOTSTRAP="$(go env GOROOT)" \
	# ... and set "cross-building" related vars to the installed system's values so that we create a build targeting the proper arch
	# (for example, if our build host is GOARCH=amd64, but our build env/image is GOARCH=386, our build needs GOARCH=386)
	GOOS="$(go env GOOS)" \
	GOARCH="$(go env GOARCH)" \
	GOHOSTOS="$(go env GOHOSTOS)" \
	GOHOSTARCH="$(go env GOHOSTARCH)" \
	; \
	# also explicitly set GO386 and GOARM if appropriate
	# https://github.com/docker-library/golang/issues/184
	apkArch="$(apk --print-arch)"; \
	case "$apkArch" in \
	armhf) export GOARM='6' ;; \
	armv7) export GOARM='7' ;; \
	x86) export GO386='387' ;; \
	esac; \
	\
	# https://github.com/golang/go/issues/38536#issuecomment-616897960
	url='https://storage.googleapis.com/golang/go1.15.3.src.tar.gz'; \
	sha256='896a602570e54c8cdfc2c1348abd4ffd1016758d0bd086ccd9787dbfc9b64888'; \
	\
	wget -O go.tgz.asc "$url.asc"; \
	wget -O go.tgz "$url"; \
	echo "$sha256 *go.tgz" | sha256sum -c -; \
	\
	# https://github.com/golang/go/issues/14739#issuecomment-324767697
	export GNUPGHOME="$(mktemp -d)"; \
	# https://www.google.com/linuxrepositories/
	gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys 'EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796'; \
	gpg --batch --verify go.tgz.asc go.tgz; \
	gpgconf --kill all; \
	rm -rf "$GNUPGHOME" go.tgz.asc; \
	\
	tar -C /usr/local -xzf go.tgz; \
	rm go.tgz; \
	\
	goEnv="$(go env | sed -rn -e '/^GO(OS|ARCH|ARM|386)=/s//export \0/p')"; \
	eval "$goEnv"; \
	[ -n "$GOOS" ]; \
	[ -n "$GOARCH" ]; \
	( \
	cd /usr/local/go/src; \
	./make.bash; \
	); \
	\
	apk del --no-network .build-deps; \
	\
	# pre-compile the standard library, just like the official binary release tarballs do
	go install std; \
	# go install: -race is only supported on linux/amd64, linux/ppc64le, linux/arm64, freebsd/amd64, netbsd/amd64, darwin/amd64 and windows/amd64
	#	go install -race std; \
	\
	# remove a few intermediate / bootstrapping files the official binary release tarballs do not contain
	rm -rf \
	/usr/local/go/pkg/*/cmd \
	/usr/local/go/pkg/bootstrap \
	/usr/local/go/pkg/obj \
	/usr/local/go/pkg/tool/*/api \
	/usr/local/go/pkg/tool/*/go_bootstrap \
	/usr/local/go/src/cmd/dist/dist \
	; \
	\
	go version

ENV GOPATH /go
ENV PATH $GOPATH/bin:$PATH
RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"

#---------------------------------------------------------------#

RUN apk add --no-cache \
	pkgconfig \
	gcc \
	libc-dev \
	git

# Hot-Reloader
RUN go get github.com/githubnemo/CompileDaemon

# Swagger 
RUN go get github.com/swaggo/swag/cmd/swag
RUN go get github.com/swaggo/http-swagger
RUN go get github.com/alecthomas/template

COPY ./ /app
WORKDIR /app