diff --git a/.travis.yml b/.travis.yml
index 78fda08e..828655ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,7 +27,6 @@ before_deploy:
 - git config --local user.name "$USER_NAME"
 - git config --local user.email "$USER_EMAIL"
 - git tag "$VERSION" "$TRAVIS_COMMIT"
-- if [[ “$TRAVIS_OS_NAME” == “osx” ]]; then yarn task package $VERSION; fi
 deploy:
   provider: releases
   file_glob: true
diff --git a/build/tasks.ts b/build/tasks.ts
index 9e5a4c6d..5af1a0d2 100644
--- a/build/tasks.ts
+++ b/build/tasks.ts
@@ -21,6 +21,8 @@ const buildServerBinary = register("build:server:binary", async (runner) => {
 	logger.info("Building with environment", field("env", {
 		NODE_ENV: process.env.NODE_ENV,
 		VERSION: process.env.VERSION,
+		OSTYPE: process.env.OSTYPE,
+		TARGET: process.env.TARGET,
 	}));
 
 	await ensureInstalled();
diff --git a/scripts/build.sh b/scripts/build.sh
index 2a7fbdb5..edf53408 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -1,32 +1,51 @@
 #!/bin/bash
 set -euxo pipefail
 
-# Variables to be set:
-# $IMAGE
+# Build using a Docker container using the specified image and version.
 function docker_build() {
-	containerID=$(docker create -it -v $(pwd)/.cache:/src/.cache $IMAGE)
-	docker start $containerID
-	docker exec $containerID mkdir -p /src
+	local image="${1}" ; shift
+	local version="${1}" ; shift
 
-	function exec() {
-		docker exec $containerID bash -c "$@"
+	local containerId
+	containerId=$(docker create --network=host --rm -it -v "$(pwd)"/.cache:/src/.cache "${image}")
+	docker start "${containerId}"
+	docker exec "${containerId}" mkdir -p /src
+
+	function docker_exec() {
+		docker exec "${containerId}" bash -c "$@"
 	}
 
-	docker cp ./. $containerID:/src
-	exec "cd /src && yarn"
-	exec "cd /src && npm rebuild"
-	exec "cd /src && NODE_ENV=production VERSION=$VERSION yarn task build:server:binary"
-	exec "cd /src && yarn task package $VERSION"
-	docker cp $containerID:/src/release/. ./release/
+	docker cp ./. "${containerId}":/src
+	docker_exec "cd /src && yarn"
+	docker_exec "cd /src && npm rebuild"
+	docker_exec "cd /src && NODE_ENV=production VERSION=${version} yarn task build:server:binary"
+	docker_exec "cd /src && yarn task package ${version}"
+	docker cp "${containerId}":/src/release/. ./release/
+
+	docker stop "${containerId}"
 }
 
-if [[ "$OSTYPE" == "darwin"* ]]; then
-	NODE_ENV=production yarn task build:server:binary
-else
-	if [[ "$TARGET" == "alpine" ]]; then
-		IMAGE="codercom/nbin-alpine"
-	else
-		IMAGE="codercom/nbin-centos"
+function main() {
+	local version=${VERSION:-}
+	local ostype=${OSTYPE:-}
+
+	if [[ -z "${version}" ]] ; then
+		>&2 echo "Must set VERSION environment variable"
+		exit 1
 	fi
-	docker_build
-fi
+
+	if [[ "${ostype}" == "darwin"* ]]; then
+		NODE_ENV=production VERSION="${version}" yarn task build:server:binary
+		yarn task package "${version}"
+	else
+		local image
+		if [[ "$TARGET" == "alpine" ]]; then
+			image="codercom/nbin-alpine"
+		else
+			image="codercom/nbin-centos"
+		fi
+		docker_build "${image}" "${version}"
+	fi
+}
+
+main "$@"