From 9fd86faf155d6654f189c90d2dbd2b6b462df090 Mon Sep 17 00:00:00 2001
From: Jeff Mitchell <jeffrey.mitchell@gmail.com>
Date: Thu, 21 May 2020 16:03:21 -0400
Subject: [PATCH] Adds a dev target to Makefile and ports over build script
 (#75)

* Initial work on dev builds

* Fix build script
---
 .gitignore                               |  4 +-
 Makefile                                 | 27 ++++---
 scripts/build.sh                         | 89 ++++++++++++++++++++++++
 {make => scripts}/protoc_gen_plugin.bash |  0
 4 files changed, 108 insertions(+), 12 deletions(-)
 create mode 100755 scripts/build.sh
 rename {make => scripts}/protoc_gen_plugin.bash (100%)

diff --git a/.gitignore b/.gitignore
index 1e39169de3..318ff93802 100644
--- a/.gitignore
+++ b/.gitignore
@@ -114,7 +114,9 @@ Sessionx.vim
 # Persistent undo
 [._]*.un~
 
-# Default output of command compilation
+# Compilation outputs
 main
+/pkg/
+/bin/
 
 # vim: set filetype=conf :
diff --git a/Makefile b/Makefile
index 6b6a4bec6e..67489656fd 100644
--- a/Makefile
+++ b/Makefile
@@ -8,38 +8,41 @@ REPO_PATH := github.com/hashicorp/watchtower
 
 GENERATED_CODE := $(shell  find ${THIS_DIR} -name '*.gen.go' && find ${THIS_DIR} -name '*.pb.go' && find ${THIS_DIR} -name '*.pb.gw.go')
 
+CGO_ENABLED?=0
+
 export GEN_BASEPATH := $(shell pwd)
 
+api:
+	$(MAKE) --environment-overrides -C api/internal/genapi api
+
 bootstrap:
 	go generate -tags tools tools/tools.go
 
-gen: cleangen proto api migrations
+cleangen:
+	@rm -f ${GENERATED_CODE}
 
-api:
-	$(MAKE) --environment-overrides -C api/internal/genapi api
+dev: BUILD_TAGS+=dev
+dev:
+	@CGO_ENABLED=$(CGO_ENABLED) BUILD_TAGS='$(BUILD_TAGS)' WATCHTOWER_DEV_BUILD=1 sh -c "'$(CURDIR)/scripts/build.sh'"
+
+gen: cleangen proto api migrations
 
 migrations:
 	$(MAKE) --environment-overrides -C internal/db/migrations/genmigrations migrations
 
-cleangen:
-	@rm -f ${GENERATED_CODE}
-
 ### oplog requires protoc-gen-go v1.20.0 or later
 # GO111MODULE=on go get -u github.com/golang/protobuf/protoc-gen-go@v1.40
 proto: protolint protobuild
 
-protolint:
-	@buf check lint
-
 protobuild:
 	# To add a new directory containing a proto pass the  proto's root path in
 	# through the --proto_path flag.
-	@bash make/protoc_gen_plugin.bash \
+	@bash scripts/protoc_gen_plugin.bash \
 		"--proto_path=internal/proto/local" \
 		"--proto_include_path=internal/proto/third_party" \
 		"--plugin_name=go" \
 		"--plugin_out=plugins=grpc:${TMP_DIR}"
-	@bash make/protoc_gen_plugin.bash \
+	@bash scripts/protoc_gen_plugin.bash \
 		"--proto_path=internal/proto/local/" \
 		"--proto_include_path=internal/proto/third_party" \
 		"--plugin_name=grpc-gateway" \
@@ -55,6 +58,8 @@ protobuild:
 	@protoc-go-inject-tag -input=./internal/db/db_test/db_test.pb.go
 	@rm -R ${TMP_DIR}
 
+protolint:
+	@buf check lint
 
 .PHONY: api bootstrap gen migrations proto
 
diff --git a/scripts/build.sh b/scripts/build.sh
new file mode 100755
index 0000000000..6d391dba3d
--- /dev/null
+++ b/scripts/build.sh
@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+#
+# This script builds the application from source for multiple platforms.
+set -e
+
+# Get the parent directory of where this script is.
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
+DIR="$( cd -P "$( dirname "$SOURCE" )/.." && pwd )"
+
+# Change into that directory
+cd "$DIR"
+
+# Set build tags
+BUILD_TAGS="${BUILD_TAGS:-"watchtower"}"
+
+# Get the git commit
+GIT_COMMIT="$(git rev-parse HEAD)"
+GIT_DIRTY="$(test -n "`git status --porcelain`" && echo "+CHANGES" || true)"
+
+# If its dev mode, only build for ourself
+if [ "${WATCHTOWER_DEV_BUILD}x" != "x" ] && [ "${XC_OSARCH}x" == "x" ]; then
+    XC_OS=$(go env GOOS)
+    XC_ARCH=$(go env GOARCH)
+    XC_OSARCH=$(go env GOOS)/$(go env GOARCH)
+elif [ "${XC_OSARCH}x" != "x" ]; then
+    IFS='/' read -ra SPLITXC <<< "${XC_OSARCH}"
+	DEV_PLATFORM="./pkg/${SPLITXC[0]}_${SPLITXC[1]}"
+fi
+
+# Determine the arch/os combos we're building for
+XC_ARCH=${XC_ARCH:-"386 amd64"}
+XC_OS=${XC_OS:-linux darwin windows freebsd openbsd netbsd solaris}
+XC_OSARCH=${XC_OSARCH:-"linux/386 linux/amd64 linux/arm linux/arm64 darwin/386 darwin/amd64 windows/386 windows/amd64 freebsd/386 freebsd/amd64 freebsd/arm openbsd/386 openbsd/amd64 openbsd/arm netbsd/386 netbsd/amd64 solaris/amd64"}
+
+GOPATH=${GOPATH:-$(go env GOPATH)}
+case $(uname) in
+    CYGWIN*)
+        GOPATH="$(cygpath $GOPATH)"
+        ;;
+esac
+
+# Delete the old dir
+echo "==> Removing old directory..."
+rm -f bin/*
+rm -rf pkg/*
+mkdir -p bin/
+
+# Build!
+# If GOX_PARALLEL_BUILDS is set, it will be used to add a "-parallel=${GOX_PARALLEL_BUILDS}" gox parameter
+echo "==> Building..."
+gox \
+    -osarch="${XC_OSARCH}" \
+    -gcflags "${GCFLAGS}" \
+    -ldflags "${LD_FLAGS}-X github.com/hashicorp/watchtower/version.GitCommit='${GIT_COMMIT}${GIT_DIRTY}'" \
+    -output "pkg/{{.OS}}_{{.Arch}}/watchtower" \
+    ${GOX_PARALLEL_BUILDS+-parallel="${GOX_PARALLEL_BUILDS}"} \
+    -tags="${BUILD_TAGS}" \
+    ./cmd/watchtower
+
+# Move all the compiled things to the $GOPATH/bin
+OLDIFS=$IFS
+IFS=: MAIN_GOPATH=($GOPATH)
+IFS=$OLDIFS
+
+# Copy our OS/Arch to the bin/ directory
+DEV_PLATFORM=${DEV_PLATFORM:-"./pkg/$(go env GOOS)_$(go env GOARCH)"}
+for F in $(find ${DEV_PLATFORM} -mindepth 1 -maxdepth 1 -type f); do
+    cp ${F} bin/
+    cp ${F} ${MAIN_GOPATH}/bin/
+done
+
+if [ "${WATCHTOWER_DEV_BUILD}x" = "x" ]; then
+    # Zip and copy to the dist dir
+    echo "==> Packaging..."
+    for PLATFORM in $(find ./pkg -mindepth 1 -maxdepth 1 -type d); do
+        OSARCH=$(basename ${PLATFORM})
+        echo "--> ${OSARCH}"
+
+        pushd $PLATFORM >/dev/null 2>&1
+        zip ../${OSARCH}.zip ./*
+        popd >/dev/null 2>&1
+    done
+fi
+
+# Done!
+echo
+echo "==> Results:"
+ls -hl bin/
diff --git a/make/protoc_gen_plugin.bash b/scripts/protoc_gen_plugin.bash
similarity index 100%
rename from make/protoc_gen_plugin.bash
rename to scripts/protoc_gen_plugin.bash