Add script for building release binaries

Author: patrickfreed

RELEASING.md

@@ -6,15 +6,7 @@
 
 1. Create a tag on that commit with the format "x.y.z". Do not omit "z", even if its value is 0.
 
-1. Build the executables for the release (do this once on an x86_64 machine and once on an aarch64 one):
-
-    - In the root of the `swiftly` repository, run the following command: `docker build -t <image name> -f scripts/build.dockerfile .`
-    - Then, run `container_id=$(docker create <image name>)`
-    - Retrieve the built swiftly executable with `docker cp "$container_id:/swiftly" <executable name>`
-      - For ARM, the executable name should be `swiftly-aarch64-unknown-linux-gnu`
-      - For x86_64, the executable name should be `swiftly-x86_64-unknown-linux-gnu`
-    - Clean up the leftover container with `docker rm -v $container_id`
-    - Clean up the leftover image with `docker rm -f <image name>`
+1. Build the executables for the release by running ./scripts/build_release.sh from the root of the swiftly repository (do this once on an x86_64 machine and once on an aarch64 one)
 
 1. Push the tag to `origin`.
 

scripts/build_release.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+version="$1"
+
+if [[ -z "$version" ]]; then
+    echo "Usage: build.sh <version tag>"
+    exit 1
+fi
+
+raw_arch="$(uname --machine)"
+case "$raw_arch" in
+    "x86_64")
+        arch="x86_64"
+        ;;
+
+    "aarch64" | "arm64")
+        arch="aarch64"
+        ;;
+
+    *)
+        echo "Error: Unsupported CPU architecture: $RAW_ARCH"
+        ;;
+esac
+
+git checkout "$version"
+
+if [[ ! -z "$(git status --porcelain=v1 2>/dev/null)" ]]; then
+    echo "There are uncommitted changes in the local tree, please commit or discard them"
+    exit 1
+fi
+
+image_name="swiftly-$version"
+binary_name="swiftly-$arch-unknown-linux-gnu"
+docker build -t "$image_name" -f scripts/build.dockerfile .
+container_id=$(docker create "$image_name")
+docker cp "$container_id:/swiftly" "$binary_name"
+docker rm -v "$container_id"
+docker image rm -f "$image_name"
+
+"./$binary_name" --version > /dev/null
+
+echo "$binary_name has been successfully built!"