build: Setup build script for Elastic Beanstalk

Buildfile

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+make: ./build.sh

build.sh

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+#!/bin/bash -xe
+# See http://tldp.org/LDP/abs/html/options.html
+# -x -> Print each command to stdout before executing it, expand commands
+# -e -> Abort script at first error, when a command exits with non-zero status
+#   (except in until or while loops, if-tests, list constructs)
+
+# $GOPATH isn't set by default, nor do we have a usable Go workspace :'(
+GOPATH="/tmp/go"
+APP_BUILD_DIR="$GOPATH/src/go-beanstalk-gin"  # We will build the app here
+APP_STAGING_DIR=`pwd`                         # Current directory
+DEP_VERSION="v0.3.2"                          # Use specific version for stability
+
+# Install dep, a Go dependency management tool, if not already installed or if
+# the version does not match.
+if ! hash dep 2> /dev/null ||\
+	[[ $(dep version | awk 'NR==2{print $3}') != "$DEP_VERSION" ]]; then
+	# /usr/local/bin is expected to be on $PATH.
+	curl -L \
+		-s https://github.com/golang/dep/releases/download/$DEP_VERSION/dep-linux-amd64 \
+		-o /usr/local/bin/dep
+
+	chmod +x /usr/local/bin/dep
+fi
+
+# Remove the $APP_BUILD_DIR just in case it was left behind in a failed build.
+rm -rf $APP_BUILD_DIR
+
+# Setup the application directory
+mkdir -p $APP_BUILD_DIR
+
+# mv all files to $APP_BUILD_DIR
+# https://superuser.com/questions/62141/how-to-move-all-files-from-current-directory-to-upper-directory
+mv * .[^.]* $APP_BUILD_DIR
+cd $APP_BUILD_DIR
+
+# Pull in dependencies into vendor/.
+dep ensure
+
+# Build the binary with jsoniter tag.
+go build -o application -tags=jsoniter .
+
+# Modify permissons to make the binary executable.
+chmod +x application
+# Move the binary back to staging dir.
+mkdir $APP_STAGING_DIR/bin
+# By default, `bin/application` is executed. This way, a Procfile isn't needed.
+mv application $APP_STAGING_DIR/bin
+# Copy .ebextensions back to staging directory.
+cp -r .ebextensions $APP_STAGING_DIR
+
+# Clean up.
+rm -rf $APP_BUILD_DIR
+
+echo "Build successful!!"