Adds a dev target to Makefile and ports over build script (#75)

* Initial work on dev builds

* Fix build script

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/

scripts/protoc_gen_plugin.bash

@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+
+# Copied with minor changes from Makego at https://github.com/bufbuild/makego/blob/master/make/go/scripts/protoc_gen_plugin.bash
+
+set -eo pipefail
+
+fail() {
+  echo "$@" >&2
+  exit 1
+}
+
+usage() {
+  echo "usage: ${0} \
+    --proto_path=path/to/one \
+    --proto_path=path/to/two \
+    --proto_include_path=path/to/one \
+    --proto_include_path=path/to/two \
+    --plugin_name=go \
+    --plugin_out=gen/proto/go \
+    --plugin_opt=plugins=grpc"
+}
+
+check_flag_value_set() {
+  if [ -z "${1}" ]; then
+    usage
+    exit 1
+  fi
+}
+
+PROTO_PATHS=()
+PROTO_INCLUDE_PATHS=()
+PLUGIN_NAME=
+PLUGIN_OUT=
+PLUGIN_OPT=
+while test $# -gt 0; do
+  case "${1}" in
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    --proto_path*)
+      PROTO_PATHS+=("$(echo ${1} | sed -e 's/^[^=]*=//g')")
+      shift
+      ;;
+    --proto_include_path*)
+      PROTO_INCLUDE_PATHS+=("$(echo ${1} | sed -e 's/^[^=]*=//g')")
+      shift
+      ;;
+    --plugin_name*)
+      PLUGIN_NAME="$(echo ${1} | sed -e 's/^[^=]*=//g')"
+      shift
+      ;;
+    --plugin_out*)
+      PLUGIN_OUT="$(echo ${1} | sed -e 's/^[^=]*=//g')"
+      shift
+      ;;
+    --plugin_opt*)
+      PLUGIN_OPT="$(echo ${1} | sed -e 's/^[^=]*=//g')"
+      shift
+      ;;
+    *)
+      usage
+      exit 1
+      ;;
+  esac
+done
+
+check_flag_value_set "${PROTO_PATHS[@]}"
+check_flag_value_set "${PLUGIN_NAME}"
+check_flag_value_set "${PLUGIN_OUT}"
+
+PROTOC_FLAGS=()
+for proto_path in "${PROTO_PATHS[@]}"; do
+  PROTOC_FLAGS+=("--proto_path=${proto_path}")
+done
+for proto_path in "${PROTO_INCLUDE_PATHS[@]}"; do
+  PROTOC_FLAGS+=("--proto_path=${proto_path}")
+done
+PROTOC_FLAGS+=("--${PLUGIN_NAME}_out=${PLUGIN_OUT}")
+if [ -n "${PLUGIN_OPT}" ]; then
+  PROTOC_FLAGS+=("--${PLUGIN_NAME}_opt=${PLUGIN_OPT}")
+fi
+
+for proto_path in "${PROTO_PATHS[@]}"; do
+  for dir in $(find "${proto_path}" -name '*.proto' -print0 | xargs -0 -n1 dirname | sort | uniq); do
+    echo protoc "${PROTOC_FLAGS[@]}" $(find "${dir}" -name '*.proto')
+    protoc "${PROTOC_FLAGS[@]}" $(find "${dir}" -name '*.proto')
+  done
+done