Dockerfile

FROM python:3.10.0b2-alpine3.13

### COPYPASTA ###
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 1.16.5

RUN set -eux; \
	apk add --no-cache --virtual .build-deps \
		bash \
		gcc \
		gnupg \
		go \
		musl-dev \
		openssl \
	; \
	apkArch="$(apk --print-arch)"; \
	case "$apkArch" in \
		'x86_64') \
			export GOARCH='amd64' GOOS='linux'; \
			;; \
		'armhf') \
			export GOARCH='arm' GOARM='6' GOOS='linux'; \
			;; \
		'armv7') \
			export GOARCH='arm' GOARM='7' GOOS='linux'; \
			;; \
		'aarch64') \
			export GOARCH='arm64' GOOS='linux'; \
			;; \
		'x86') \
			export GO386='softfloat' GOARCH='386' GOOS='linux'; \
			;; \
		'ppc64le') \
			export GOARCH='ppc64le' GOOS='linux'; \
			;; \
		's390x') \
			export GOARCH='s390x' GOOS='linux'; \
			;; \
		*) echo >&2 "error: unsupported architecture '$apkArch' (likely packaging update needed)"; exit 1 ;; \
	esac; \
	\
# https://github.com/golang/go/issues/38536#issuecomment-616897960
	url='https://dl.google.com/go/go1.16.5.src.tar.gz'; \
	sha256='7bfa7e5908c7cc9e75da5ddf3066d7cbcf3fd9fa51945851325eebc17f50ba80'; \
	\
	wget -O go.tgz.asc "$url.asc"; \
	wget -O go.tgz "$url"; \
	echo "$sha256 *go.tgz" | sha256sum -c -; \
	\
# https://github.com/golang/go/issues/14739#issuecomment-324767697
	export GNUPGHOME="$(mktemp -d)"; \
# https://www.google.com/linuxrepositories/
	gpg --batch --keyserver keyserver.ubuntu.com --recv-keys 'EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796'; \
	gpg --batch --verify go.tgz.asc go.tgz; \
	gpgconf --kill all; \
	rm -rf "$GNUPGHOME" go.tgz.asc; \
	\
	tar -C /usr/local -xzf go.tgz; \
	rm go.tgz; \
	\
	( \
		cd /usr/local/go/src; \
# set GOROOT_BOOTSTRAP + GOHOST* such that we can build Go successfully
		export GOROOT_BOOTSTRAP="$(go env GOROOT)" GOHOSTOS="$GOOS" GOHOSTARCH="$GOARCH"; \
		if [ -n "${GO386:-}" ]; then \
# https://github.com/docker-library/golang/issues/359 -> https://github.com/golang/go/issues/44500
# Go 1.15 + Alpine 3.14 == Go 1.16 bootstrap
# Go 1.16 + Alpine 3.13 == Go 1.15 bootstrap
# (once Go 1.15 *and* Alpine 3.13 go away, we can remove this)
			GO386= ./bootstrap.bash; \
			export GOROOT_BOOTSTRAP="/usr/local/go-$GOOS-$GOARCH-bootstrap"; \
			"$GOROOT_BOOTSTRAP/bin/go" version; \
		fi; \
		./make.bash; \
		if [ -n "${GO386:-}" ]; then \
			rm -rf "$GOROOT_BOOTSTRAP"; \
		fi; \
	); \
	\
# 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; \
	\
	apk del --no-network .build-deps; \
	\
# 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"
WORKDIR $GOPATH
### /COPYPASTA ###

RUN go get -u \
    golang.org/x/tools/cmd/goimports \
    mvdan.cc/gofumpt \
    github.com/segmentio/golines

ENV PYTHONUNBUFFERED True
ENV APP_HOME /app
WORKDIR $APP_HOME
COPY . $APP_HOME

RUN pip install -r requirements-web.txt .

CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 --chdir $APP_HOME/pytago pytago.app:app