build.sh

#!/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="v0.4.1"                          # 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!!"