Build wal-g binary for alpine

Signed-off-by: Tamal Saha <[email protected]>

Makefile

@@ -3,7 +3,7 @@ PKG_FILES = $(wildcard internal/**/*.go internal/**/**/*.go internal/*.go)
 TEST_FILES = $(wildcard test/*.go testtools/*.go)
 PKG := github.com/wal-g/wal-g
 
-.PHONY: test fmt lint all install clean
+.PHONY: test fmt lint all install clean alpine
 
 ifdef GOTAGS
 override GOTAGS := -tags $(GOTAGS)
@@ -34,3 +34,18 @@ clean:
 
 build: $(CMD_FILES) $(PKG_FILES)
 	(cd cmd/wal-g && go build $(GOTAGS) -ldflags "-s -w -X main.BuildDate=`date -u +%Y.%m.%d_%H:%M:%S` -X main.GitRevision=`git rev-parse --short HEAD` -X main.WalgVersion=`git tag -l --points-at HEAD`")
+
+alpine: $(CMD_FILES) $(PKG_FILES)
+	rm -rf .brotli.tmp
+	rm -rf ./vendor/github.com/google/brotli/dist
+	docker build --pull -t wal-g/golang:1.11-alpine ./docker/go-alpine
+	docker run                          \
+	    --rm                            \
+	    -u $$(id -u):$$(id -g)          \
+	    -v /tmp:/.cache                 \
+	    -v "$$(pwd):/go/src/$(PKG)"     \
+	    -w /go/src/$(PKG)               \
+	    -e GOOS=linux                   \
+	    -e GOARCH=amd64                 \
+	    wal-g/golang:1.11-alpine        \
+	    ./build-alpine.sh

build-alpine.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+set -e -x
+
+if ! which dep > /dev/null; then
+    go get -u github.com/golang/dep/cmd/dep  # install dependencies management system
+fi
+
+make deps  # install dependencies
+
+test -d tmp  || mkdir tmp
+
+cp -rf vendor/github.com/google/brotli/* tmp/
+cp -rf submodules/brotli/* vendor/github.com/google/brotli/
+
+readonly CWD=$PWD
+
+cd vendor/github.com/google/brotli/go/cbrotli
+
+readonly LIB_DIR=../../dist  # dist will contain binaries and it is in the google/brotli/.gitignore
+
+# patch cgo.go to force usage of static libraries for linking
+sed -i -e "s|#cgo LDFLAGS: -lbrotlicommon|#cgo CFLAGS: -I../../c/include|" cgo.go
+sed -i -e "s|\(#cgo LDFLAGS:\) \(-lbrotli.*\)|\1 -L$LIB_DIR \2-static -lbrotlicommon-static|" cgo.go
+sed -i -e "/ -lm$/ n; /brotlienc/ s|$| -lm|" cgo.go
+
+mkdir -p ${LIB_DIR}
+
+cd ${LIB_DIR}
+../configure-cmake --disable-debug
+make
+
+cd ${CWD}
+make
+
+rm -rf vendor/github.com/google/brotli/*
+mv tmp/* vendor/github.com/google/brotli/
+rm -rf tmp/

docker/go-alpine/Dockerfile

@@ -0,0 +1,4 @@
+FROM golang:1.11-alpine
+
+RUN apk add --update --no-cache ca-certificates cmake bash build-base git
+