Deterministic builds using Docker (#69)

.gitignore

@@ -22,3 +22,6 @@ dist/
 
 # environment variables
 .env
+
+# canister wasms
+wasms/

Dockerfile

@@ -0,0 +1,31 @@
+# To build run 'docker build . -t openchat'
+FROM ubuntu:22.04 as builder
+SHELL ["bash", "-c"]
+
+ARG git_commit_id
+ARG rust_version=1.76.0
+
+ENV GIT_COMMIT_ID=$git_commit_id
+ENV TZ=UTC
+
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && \
+    apt -yq update && \
+    apt -yqq install --no-install-recommends curl ca-certificates build-essential
+
+# Install Rust and Cargo in /opt
+ENV RUSTUP_HOME=/opt/rustup \
+    CARGO_HOME=/opt/cargo \
+    PATH=/cargo/bin:/opt/cargo/bin:$PATH
+
+RUN curl --fail https://sh.rustup.rs -sSf \
+        | sh -s -- -y --default-toolchain ${rust_version}-x86_64-unknown-linux-gnu --no-modify-path && \
+    rustup default ${rust_version}-x86_64-unknown-linux-gnu && \
+    rustup target add wasm32-unknown-unknown
+
+# Install IC Wasm
+RUN cargo install --version 0.7.1 ic-wasm
+
+COPY . /build
+WORKDIR /build
+
+RUN sh ./scripts/build-wasm.sh

dfx.json

@@ -1,9 +1,10 @@
 {
   "canisters": {
     "event_store": {
+      "type": "custom",
       "candid": "rs/canister/api/can.did",
-      "package": "event_store_canister_impl",
-      "type": "rust"
+      "wasm": "wasms/event_store.wasm.gz",
+      "build":  "scripts/build-wasm.sh"
     }
   },
   "version": 1

scripts/build-wasm.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+SCRIPT=$(readlink -f "$0")
+SCRIPT_DIR=$(dirname "$SCRIPT")
+cd $SCRIPT_DIR/..
+
+CANISTER_NAME="event_store"
+PACKAGE="${CANISTER_NAME}_canister_impl"
+
+if [ -z "${CARGO_HOME}" ]
+then
+  export CARGO_HOME="${HOME}/.cargo"
+fi
+
+if [ -z "${GIT_COMMIT_ID}" ]
+then
+  export GIT_COMMIT_ID=$(git rev-parse HEAD)
+fi
+
+echo Building package $PACKAGE
+export RUSTFLAGS="--remap-path-prefix $(readlink -f ${SCRIPT_DIR}/..)=/build --remap-path-prefix ${CARGO_HOME}/bin=/cargo/bin --remap-path-prefix ${CARGO_HOME}/git=/cargo/git"
+for l in $(ls ${CARGO_HOME}/registry/src/)
+do
+  export RUSTFLAGS="--remap-path-prefix ${CARGO_HOME}/registry/src/${l}=/cargo/registry/src/github ${RUSTFLAGS}"
+done
+cargo build --locked --target wasm32-unknown-unknown --release --package $PACKAGE
+
+echo Optimising wasm
+if ! cargo install --list | grep -Fxq "ic-wasm v0.7.1:"
+then
+  cargo install --version 0.7.1 ic-wasm
+fi
+ic-wasm ./target/wasm32-unknown-unknown/release/$PACKAGE.wasm -o ./target/wasm32-unknown-unknown/release/$PACKAGE-opt.wasm shrink
+
+echo Compressing wasm
+mkdir -p wasms
+gzip -fckn target/wasm32-unknown-unknown/release/$PACKAGE-opt.wasm > ./wasms/$CANISTER_NAME.wasm.gz

scripts/docker-build-wasm.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+SCRIPT=$(readlink -f "$0")
+SCRIPT_DIR=$(dirname "$SCRIPT")
+cd $SCRIPT_DIR/..
+
+GIT_COMMIT_ID=$(git rev-parse HEAD)
+
+echo "CommitId: $GIT_COMMIT_ID"
+
+docker build -t event_store --build-arg git_commit_id=$GIT_COMMIT_ID .
+
+container_id=$(docker create event_store)
+rm -rf wasms
+docker cp $container_id:/build/wasms wasms
+docker rm --volumes $container_id
+
+cd wasms
+for wasm in *; do
+    shasum -a 256 "$wasm"
+done
+cd ..