RFC: Reproducible vendor directory contents #9768

.gitignore

/vendor/

README.md

RFC: Reproducible vendor directory contents

From composer/composer#9768:

With given composer.lock and docker --cache-from must produce same image even if the builds share no previous state.

Install

Clone this prpoject:

git clone -b v1 https://gist.github.com/glensc/b51e9a8c180f3ca3ca1a6593931d431d composer-feat-9768
cd composer-feat-9768

Test

Ensure pristine state, delete local build cache and images:

docker builder prune -fa
docker image prune -fa

Let's assume previous build is published at $CACHE_TAG, and we are tagging built image as $IMAGE_TAG:

DOCKER_BUILDKIT=1 \
docker build \
	--build-arg=BUILDKIT_INLINE_CACHE=1 \
	--tag=$IMAGE_TAG \
	--cache-from=$CACHE_TAG \
	.

buildkit

#!/bin/sh
# Script to build reproducible docker image
# https://github.com/composer/composer/issues/9768

set -eu

docker builder prune -fa
docker image prune -fa

REPO_SLUG=glen/composer-feat-9768

CACHE_TAG=$REPO_SLUG:v2
IMAGE_TAG=$REPO_SLUG:v3

DOCKER_BUILDKIT=1 \
docker build \
	--build-arg=BUILDKIT_INLINE_CACHE=1 \
	--tag=$IMAGE_TAG \
	--cache-from=$CACHE_TAG \
	.

composer.json

{
    "name": "glensc/feat-9768",
    "require": {
        "composer/ca-bundle": "^1.2"
    }
}

composer.lock

{
    "_readme": [
        "This file locks the dependencies of your project to a known state",
        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
        "This file is @generated automatically"
    ],
    "content-hash": "21d1bed8572d313ae854da0dcde54115",
    "packages": [
        {
            "name": "composer/ca-bundle",
            "version": "1.2.9",
            "source": {
                "type": "git",
                "url": "https://github.com/composer/ca-bundle.git",
                "reference": "78a0e288fdcebf92aa2318a8d3656168da6ac1a5"
            },
            "dist": {
                "type": "zip",
                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/78a0e288fdcebf92aa2318a8d3656168da6ac1a5",
                "reference": "78a0e288fdcebf92aa2318a8d3656168da6ac1a5",
                "shasum": ""
            },
            "require": {
                "ext-openssl": "*",
                "ext-pcre": "*",
                "php": "^5.3.2 || ^7.0 || ^8.0"
            },
            "require-dev": {
                "phpstan/phpstan": "^0.12.55",
                "psr/log": "^1.0",
                "symfony/phpunit-bridge": "^4.2 || ^5",
                "symfony/process": "^2.5 || ^3.0 || ^4.0 || ^5.0"
            },
            "type": "library",
            "extra": {
                "branch-alias": {
                    "dev-main": "1.x-dev"
                }
            },
            "autoload": {
                "psr-4": {
                    "Composer\\CaBundle\\": "src"
                }
            },
            "notification-url": "https://packagist.org/downloads/",
            "license": [
                "MIT"
            ],
            "authors": [
                {
                    "name": "Jordi Boggiano",
                    "email": "j.boggiano@seld.be",
                    "homepage": "http://seld.be"
                }
            ],
            "description": "Lets you find a path to the system CA bundle, and includes a fallback to the Mozilla CA bundle.",
            "keywords": [
                "cabundle",
                "cacert",
                "certificate",
                "ssl",
                "tls"
            ],
            "funding": [
                {
                    "url": "https://packagist.com",
                    "type": "custom"
                },
                {
                    "url": "https://github.com/composer",
                    "type": "github"
                },
                {
                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
                    "type": "tidelift"
                }
            ],
            "time": "2021-01-12T12:10:35+00:00"
        }
    ],
    "packages-dev": [],
    "aliases": [],
    "minimum-stability": "stable",
    "stability-flags": [],
    "prefer-stable": false,
    "prefer-lowest": false,
    "platform": [],
    "platform-dev": [],
    "plugin-api-version": "1.1.0"
}

Dockerfile

#
# Dockerfile for Reproducible build
# https://github.com/composer/composer/issues/9768

# glen/composer-feat-9768:alpine-3.13 is just a snapshot of alpine:3.13
FROM glen/composer-feat-9768:alpine-3.13 AS base

FROM composer:2.0.8 AS deps
WORKDIR /app
COPY composer.* .
RUN composer install --no-dev

# common timestamp for all files in vendor until composer supports that itself
# https://github.com/composer/composer/issues/9768
ARG TIMESTAMP="2021-03-10 19:33:10"
RUN find vendor | xargs touch --date="$TIMESTAMP"

FROM base AS app
WORKDIR /app
COPY --from=deps /app/vendor ./vendor