From 86e034605a00c80837e23d38ca10f12685b75be4 Mon Sep 17 00:00:00 2001
From: Piyush Mishra <piyush.raj.kit@gmail.com>
Date: Sun, 21 Feb 2021 11:20:54 +0530
Subject: [PATCH] heroku

---
 .travis.yml             |   8 +++
 bin/compile             | 152 ++++++++++++++++++++++++++++++++++++++++
 bin/detect              |   8 +++
 docker-compose-test.yml |  12 ++++
 test_buildpack          |  17 +++++
 5 files changed, 197 insertions(+)
 create mode 100644 .travis.yml
 create mode 100755 bin/compile
 create mode 100755 bin/detect
 create mode 100644 docker-compose-test.yml
 create mode 100755 test_buildpack

diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..7cdb7e8
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+os: "linux"
+sudo: "required"
+services:
+- "docker"
+script:
+# Test both pristine and cached deploys.
+- "./test_buildpack"
+- "./test_buildpack"
diff --git a/bin/compile b/bin/compile
new file mode 100755
index 0000000..5fc3983
--- /dev/null
+++ b/bin/compile
@@ -0,0 +1,152 @@
+#!/bin/bash
+
+# Find all the directories we might need (based on
+# heroku-buildpack-nodejs code).
+BUILD_DIR=${1:-}
+CACHE_DIR=${2:-}
+ENV_DIR=${3:-}
+BP_DIR=$(cd $(dirname ${0:-}); cd ..; pwd)
+
+# Export DATABASE_URL at build time, mostly because Diesel is the best way to
+# do SQL in Rust right now, and Diesel will use it to generate code for the
+# database schema.
+if [ -e "$ENV_DIR/DATABASE_URL" ]; then
+  export DATABASE_URL="$(cat $ENV_DIR/DATABASE_URL)";
+fi
+
+# Set defaults for our configuration variables.  Stable Rust is sufficiently
+# stable at this point that I think we can just default it.
+VERSION=stable
+
+# Set this to "1" in `RustConfig` to just install a Rust toolchain and not
+# build `Cargo.toml`.  This is useful if you have a project written in Ruby
+# or Node (for example) that needs to build extension modules using Rust.
+RUST_SKIP_BUILD=0
+# If your Rust code is not at the root directory of the repository, specify a
+# `BUILD_PATH` to the correct directory in the `RustConfig`
+BUILD_PATH=""
+# Set this to "1" in `RustConfig` to install diesel at build time and copy it
+# into the target directory, next to your app binary. This makes it easy to
+# run migrations by adding a release step to your Procfile:
+# `release: ./target/release/diesel migration run`
+RUST_INSTALL_DIESEL=0
+# These flags are passed to `cargo install diesel`, e.g. '--no-default-features --features postgres'
+DIESEL_FLAGS=""
+# Default build flags to pass to `cargo build`.
+RUST_CARGO_BUILD_FLAGS="--release"
+
+# Load our toolchain configuration, if any was specified.
+if [ -f "$BUILD_DIR/rust-toolchain" ]; then
+    VERSION="$(cat "$BUILD_DIR/rust-toolchain")"
+fi
+
+# Load our configuration variables, if any were specified.
+if [ -f "$BUILD_DIR/RustConfig" ]; then
+    . "$BUILD_DIR/RustConfig"
+fi
+
+# Standard paranoia.
+set -eu
+
+# Check our configuration options.
+if [ -z ${VERSION+x} ]; then
+  >&2 echo "failed: must set VERSION with rust-toolchain or RustConfig to indicate the Rust version."
+  exit 1
+fi
+
+# Notify users running old, unstable versions of Rust about how to deploy
+# successfully.
+if [ $RUST_SKIP_BUILD -ne 1  ] && ( [ ! -z ${CARGO_URL+x} ] || [ ! -f "$BUILD_DIR/$BUILD_PATH/Cargo.toml" ] ); then
+    >&2 cat <<EOF
+To deploy a modern Rust app, make sure you have a Cargo.toml file, and that
+you do not define CARGO_URL or CARGO_VERSION in RustConfig.  If you're
+using an older version of Rust, and you need to re-deploy an existing
+application, try setting your buildpack to:
+
+  https://github.com/emk/heroku-buildpack-rust.git#old-rust
+EOF
+    exit 1
+fi
+
+# Handle people who still aren't using Rustup.
+if [ ! -z ${URL+x} ]; then
+    >&2 cat <<EOF
+heroku-pack-rust has switched to using rustup.  You no longer need a
+URL field in RustConfig. Instead, you should just specify a
+rustup-compatible version (such as `1.11`, `stable` or `nighty`) in VERSION.
+EOF
+    exit 1
+fi
+
+# Record our Rust build environment configuration in an export file, in
+# case another buildpack needs it to build Ruby gems that use Rust or
+# something like that.
+cat <<EOF > $BP_DIR/export
+# Our rustup installation.
+export RUSTUP_HOME="$CACHE_DIR/multirust"
+
+# Our cargo installation.  We implicitly trust Rustup and Cargo
+# to do the right thing when new versions are released.
+export CARGO_HOME="$CACHE_DIR/cargo"
+
+# Include binaries installed by cargo and rustup in our path.
+PATH="\$CARGO_HOME/bin:\$PATH"
+EOF
+
+# Read our build environment back in and evaluate it so that we can use it.
+. $BP_DIR/export
+
+# Switch to our cache directory.
+mkdir -p "$CACHE_DIR"
+cd "$CACHE_DIR"
+
+# Make sure we have an appropriate Rust toolchain installed.
+if [ -d "$CARGO_HOME" ]; then
+    echo "-----> Checking for new releases of Rust $VERSION channel"
+    # It's possible that $VERSION has changed, or the `stable` channel has updated.
+    rustup self update
+    rustup update "$VERSION"
+    rustup default "$VERSION"
+else
+    echo "-----> Downloading rustup"
+    curl https://sh.rustup.rs -sSf > rustup.sh
+    chmod u+x rustup.sh
+    echo "-----> Using rustup to install Rust channel $VERSION"
+    ./rustup.sh -y --default-toolchain "$VERSION"
+    rm rustup.sh
+fi
+if [ ! -x "$CARGO_HOME/bin/rustc" ]; then
+  echo "failed: Cannot find Rust binaries at $CARGO_HOME"
+  exit 1
+fi
+
+# This is where we will cache our Rust output.  Note the suggestions at
+# https://github.com/alexcrichton/cargo/commit/014765f788ca1c2476936835ca32cc2746f99b42
+# which describe how this needs to be named.
+export CARGO_TARGET_DIR="$CACHE_DIR/target"
+
+if [ $RUST_SKIP_BUILD -ne 1 ]; then
+  # Build our project (into CARGO_TARGET_DIR so we have caching) and copy it
+  # back to the source tree.  In theory, we could probably just copy the
+  # binary or do something clever with `cargo install`, but we haven't
+  # figured that out yet.
+  #
+  # To debug git issues:
+  #export RUST_LOG="cargo::sources::git=debug"
+  # To debug compiler and linking issues, add `--verbose`.
+  echo "-----> Building application using Cargo"
+  cd "$BUILD_DIR/$BUILD_PATH"
+  rm -rf target/
+  cargo build $RUST_CARGO_BUILD_FLAGS
+  mkdir -p target/release
+  find "$CARGO_TARGET_DIR/release" -maxdepth 1 -type f -executable -exec cp -a -t target/release {} \;
+else
+  echo "-----> Skipping Cargo build"
+fi
+
+# Install diesel so we can use it for migrations
+if [ $RUST_INSTALL_DIESEL -eq 1 ]; then
+  echo "-----> Installing diesel"
+  cargo install diesel_cli $DIESEL_FLAGS || echo "already installed"
+  cp $(which diesel) target/release/
+fi
diff --git a/bin/detect b/bin/detect
new file mode 100755
index 0000000..fba4b47
--- /dev/null
+++ b/bin/detect
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ -f "$1/RustConfig" ] || [ -f "$1/rust-toolchain" ] || [ -f "$1/Cargo.toml" ]; then
+    echo "Rust"
+    exit 0
+else
+    exit 1
+fi
diff --git a/docker-compose-test.yml b/docker-compose-test.yml
new file mode 100644
index 0000000..cfe37f8
--- /dev/null
+++ b/docker-compose-test.yml
@@ -0,0 +1,12 @@
+# This is called from ./test_buildpack.
+version: "2"
+services:
+  testbuild:
+    image: "heroku/cedar"
+    volumes:
+      - ".:/src"
+    working_dir: "/src"
+    environment:
+      HOME: "/src"
+    user: "$UID:$GROUPS"
+    command: ["bin/compile", "/src/rust-buildpack-example-actix", "/src/cache"]
diff --git a/test_buildpack b/test_buildpack
new file mode 100755
index 0000000..535293b
--- /dev/null
+++ b/test_buildpack
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Standard paranoia.  The `-e` is critical if we want failed tests to be
+# reported on Travis.
+set -euo pipefail
+
+# Get an example program for testing if we don't have one yet.
+if [ ! -d ./rust-buildpack-example-actix ]; then
+    git clone https://github.com/emk/rust-buildpack-example-actix.git
+fi
+
+# Export the current UID so that our child processes can see it.  This will
+# be used as a parameter in our `docker-compose-test.yml` file.
+export UID GROUPS
+
+# Run the build in a Heroku-like environment using `docker-compose`.
+docker-compose -f docker-compose-test.yml up