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README.md

Next Generation HHVM Binary Packaging

All linux builds will be in Docker containers, on AWS.

Configuration

Distribution subdirectories should be consistently named: DISTRO-NUMERIC_VERSION[-VERSION_NAME] - for example, debian-9-stretch, or ubuntu-16.04-xenial. There are two required files:

  • make-package: executable script that creates a package from /var/out/hhvm-nightly-$VERSION.tar.gz, and put the output in /var/out
  • DOCKER_BASE: plain text file containing the name of a public docker image that should be used for the build - for example, debian:stretch. It needs to be possible to pass this to docker run, for example, docker run -it debian:stretch /bin/bash -l should work.

Docker containers will have the following directories bind-mounted:

  • /var/out: read-write; build artifacts (e.g. packages) go here.
  • /opt/hhvm-packaging: read-only; this directory.
  • /opt/hhvm-distro-packaging: read-only; the subdirectory for your distribution. This should contain a make-package script or symlink

For example, when building for Debian Jessie, the debian-8-jessie/ subdirectory is mounted to /opt/hhvm-distro-packaging.

The package building process will execute /opt/hhvm-distro-packaging/make-package in the container, and will expect that to create packages in /var/out. make-package should install all required build dependencies. Use the native package manager's support for build-depends or similar where possible.

Debian-like distributions

You probably want make-package to be a symlink to /opt/hhvm-packaging/bin/make-debianish-package; this expects:

  • a DISTRIBUTION file containing the string name for the distribution - e.g. 'jessie', 'trusty'
  • a PKGVER file containing the package version - e.g. 1~jessie
  • a debian/ subdirectory, containing control, rules, etc.

If you are able to use an existing distribution's debian/ directory directly, please make it a symlink to /opt/hhvm-packaging/OTHER_DISTRO_HERE/debian.

Packages will be build with debbuild

Local interactive usage

  1. Install Docker
  2. run bin/make-interactive-container; you now have a shell in the container
  3. within the container, install git (e.g. apt-get update -y; apt-get install -y git)
  4. run /opt/hhvm-packaging/bin/make-source-tarball
  5. run /opt/hhvm-distro-packaging/make-package

You can specify a distribution at step 2 - for example, `bin/interactive-container debian-9-stretch'

Building packages non-interactively

  1. Install Docker
  2. If you are on MacOS, brew install gnu-tar, and export TAR=gtar
  3. bin/make-source-tarball (just once)
  4. run bin/make-package-in-throwaway-container DISTRO_ID (for each distribution)

DISTRO_ID is the name of one of the distribution-specific subdirectories, e.g. debian-9-stretch.

AWS

As we want to execute docker commands, we run directly on EC2, not ECS. AWS supports running commands on EC2 instance startup - EC2 calls this 'user data' - a file or script-as-text in 'user data' will be executed.

The scripts we use are in the aws/ subdirectory, and expect to be ran on Ubuntu 16.04 hosts.

Building source tarball and linux packages for new releases

  • tag the release on the hhvm-staging repo
  • bin/build-on-aws VERSION

If you just need to rebuild for one distribution, with no code changes:

  • edit DISTRO/PKGVER if needed (e.g. if a previous package was pushed for this HHVM version and distribution) and push to github
  • bin/build-on-aws VERSION DISTRO

Building source tarballs and linux packages for multiple new releases

The common case is fixing a bug in multiple releases - for example, the current release and all active LTS releases - simultaneously.

  • tag all the releases on the hhvm-staging repo
  • bin/build-on-aws VERSION1 [VERSION2 [...]]

How it works

There are 3 kinds of jobs used here:

  • AWS lambdas: code that can be written in stateless javascript/python
  • jobs that run on EC2 instances: any other code. For example, building HHVM, or updating apt repositories
  • AWS step functions: these are state machines, which coordinate the previous steps

See aws/hhvm1/README.md for more details.

Nightly builds are triggered by a CloudWatch scheduled event rule.

S3 Buckets

  • hhvm-downloads: public. This is dl.hhvm.com
  • hhvm-scratch: private. build artifacts and release source tarballs before public

EC2 Jobs

Each kind of EC2 job has distinct 'userdata'; this is a shell script that AWS will invoke when imaged. You can see these in aws/userdata/. Some of them depend on environment variables being set - this is accomplished by using lambdas to spawn them, which prepend variable initialization to the userdata script before passing it to the EC2 API.

Note: The userdata scripts are no longer run directly on EC2 startup, they are now passed as "tasks" to "workers". See aws/hhvm1/README.md for more details.

Currently these are:

  1. make-source-tarball.sh: creates and signs source tarballs.
    • if this is a nightly build (version like YYYY.MM.DD), it will create the tarball from the master branch of facebook/hhvm, and immediately publish to the hhvm-downloads S3 bucket
    • if this is a release build (any other version format), it will create the tarball from the appropriate HHVM-x.y.z tag of hhvm/hhvm-staging, and instead upload to the hhvm-scratch S3 bucket
  2. make-binary-package.sh: create a distribution packages (e.g .deb for Debian or Ubuntu) for a specific distribution and distribution version - e.g. Ubuntu 16.04 will be built on a separate instance to Ubuntu 16.10. Results are published to the hhvm-scratch bucket
  3. update-repos.sh: update the apt repositories or similar: this moves the binaries from hhvm-scratch to hhvm-downloads
  4. publish-release-source.sh:
    • for nightlies, this does nothing
    • for release builds, this copies the source to s3://hhvm-downloads/source/, and copies the branch and tag from hhvm/hhvm-staging to facebook/hhvm

Lambdas

There's a lot of these; the best way to see how these fit together is to look at the step function defintions. They take JSON input, and produce JSON output. As step functions work like a pipeline, the output usually contains all the input data, but with fields added or modified. If a field isn't relevant to the lambda, the lambda should return it verbatim.

If you want to invoke them manually:

aws lambda invoke --function-name my-func-name --payload "$(pbpaste)" /dev/stdout

... assuming the JSON input is in your clipboard, and you're on mac. Otherwise, replace "$(pbpaste)" with the JSON payload.

But more likely you just want:

bin/build-on-aws StepName ...

which starts an AWS state machine that invokes the correct combination of lambdas to perform the specified build step(s).

Currently, these are:

  • hhvm-get-build-status: this is the code behind https://hhvm.com/api/build-status/VERSION (also used from some scripts and other lambdas)
  • create-s3-index-html: takes an S3 bucket ID, and automatically generates index.html files
  • hhvm-invalidate-repository-metadata-on-cloudfront: optionally takes a version number, but it's unused except for a job ID. It purges all apt metadata from the CDN caches. This is usually a final step in the build process.
  • see aws/hhvm1/README.md for information about other lambdas (meant to be only triggered from the build state machine)

Resuming Failed Step Functions

bin/build-on-aws automatically checks which steps need to run and which are already completed, so re-running it with the same parameters (after fixing the issue that caused it to fail) should resume where it left off.

Debugging Issues With Lambdas

The step function output includes an 'Exception' tab. If it's not useful, follow the links to 'cloudwatch logs' on the info tab.

See also aws/hhvm1/README.md for more debugging options.

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