We create slightly-modified Firefox releases for some extra audiences
EME-free builds, which disable DRM plugins by default
Funnelcake builds, which are used for Mozilla experiments
partner builds, which customize Firefox for external partners
We use the phrase “partner repacks” to refer to all these builds because they use the same process of repacking regular Firefox releases with additional files. The specific differences depend on the type of build.
We produce partner repacks for some beta builds, and for release builds, as part of the release automation. We don’t produce any files to update these builds as they are handled automatically (see updates).
We also produce Partner attribution builds, which are Firefox Windows installers with a cohort identifier added.
Parameters & Scheduling¶
Partner repacks have a number of parameters which control how they work:
We split the repacks into two ‘paths’, EME-free and everything else, to retain some flexibility over enabling/disabling them separately. This costs us some duplication of the kinds in the repacking stack. The two enable parameters are booleans to turn these two paths on/off. We set them in shipit’s is_partner_enabled() when starting a release. They’re both true for Firefox betas >= b8 and releases, but otherwise disabled.
release_partner_config is a dictionary of configuration data which drives the task generation
logic. It’s usually looked up during the release promotion action task, using the Github
GraphQL API in the get_partner_config_by_url() function, with the
url defined in taskcluster/ci/config.yml.
release_partner_build_number is an integer used to create unique upload paths in the firefox
candidates directory, while
release_partners is a list of partners that should be
repacked (i.e. a subset of the whole config). Both are intended for use when respinning a few partners after
the regular Firefox has shipped. More information on that can be found in the
Most of the machine time for generating partner repacks takes place in the promote phase of the automation, or promote_rc in the case of X.0 release candidates. The EME-free builds are copied into the Firefox releases directory in the push phase, along with the regular bits.
We need some configuration to know what to repack, and how to do that. The what is defined by default.xml manifests, as used with the repo tool for git. The default.xml for EME-free illustrates this:
<?xml version="1.0" ?> <manifest> <remote fetch="firstname.lastname@example.org:mozilla-partners/" name="mozilla-partners"/> <remote fetch="email@example.com:mozilla/" name="mozilla"/> <project name="repack-scripts" path="scripts" remote="mozilla-partners" revision="master"/> <project name="build-tools" path="scripts/tools" remote="mozilla" revision="master"/> <project name="mozilla-EME-free" path="partners/mozilla-EME-free" remote="mozilla-partners" revision="master"/> </manifest>
The repack-scripts and build-tools repos are found in all manifests, and then there is a list of partner repositories which contain the how configuration. Some of these repos are not publicly visible.
A partner repository may contain multiple configurations inside the
desktop directory. Each
subdirectory must contain a
repack.cfg and a
distribution directory, the latter
containing the customizations needed. Here’s EME-free’s repack.cfg:
aus="mozilla-EMEfree" dist_id="mozilla-EMEfree" dist_version="1.0" linux-i686=false linux-x86_64=false locales="ach af an ar" # truncated for display here mac=true win32=true win64=true output_dir="%(platform)s-EME-free/%(locale)s" # Upload params upload_to_candidates=true
Note the list of locales and boolean toggles for enabling platforms. The
upload_to_candidates parameters are only present for repacks which are uploaded into the
All customizations will be placed in the
distribution directory at the root of the Firefox
install directory, or in the case of OS X in
distribution.ini file is the minimal requirement, here’s an example from EME-free:
# Partner Distribution Configuration File # Author: Mozilla # Date: 2015-03-27 [Global] id=mozilla-EMEfree version=1.0 about=Mozilla Firefox EME-free [Preferences] media.eme.enabled=false app.partner.mozilla-EMEfree="mozilla-EMEfree"
Extensions and other customizations might also be included in repacks.
The stack of tasks to create partner repacks is broadly similar to localised nightlies and regular releases. The basic form is
partner repack - insert the customisations into the the regular builds
signing - sign the internals which will become the installer (Mac only)
repackage - create the “installer” (Mac and Windows)
chunking dummy - a linux only bridge to …
repackage signing - sign the “installers” (mainly Windows)
beetmover - move the files to a partner-specific destination
beetmover checksums - possibly beetmove the checksums from previous step
Some key divergences are:
all intermediate artifacts are uploaded with a
we don’t insert any binaries on Windows so no need for internal signing
there’s no need to create any complete mar files at the repackage step
we support both public and private destinations in beetmover
we only need beetmover checksums for EME-free builds
platforms: Typically all (but depends on what’s enabled by partner configuration)
There is one task per platform in this step, calling out to scripts/desktop_partner_repacks.py in mozharness to prepare an environment and then perform the repacks. The actual repacking is done by python/mozrelease/mozrelease/partner_repack.py.
It takes as input the build-signing and l10n-signing artifacts, which are all zip/tar.gz/tar.bz2
archives, simplifying the repack process by avoiding dmg and exe. Windows produces
setup.exe, Mac is
target.tar.gz, Linux is the final product
(beetmover handles pretty naming as usual).
We chunk the single partner repack task out to a signing task with 5 artifacts each. For
example, EME-free will become 19 tasks. We collect the target.tar.gz from the
upstream, and return a signed target.tar.gz. We use a
target.dmg artifact for
nightlies/regular releases, but this is converted to
target.tar.gz by the signing
scriptworker before sending it to the signing server, so partners are equivalent. The
uploads the binaries to apple, while the
poller task waits for their approval, then
release-partner-repack-signing staples on the notarization ticket.
platforms: Mac & Windows
Mac has a repackage job for each of the signing tasks. Windows repackages are chunked here to
the same granularity as mac. Takes
setup.exe to produce
target.tar.gz to produce
target.dmg on Mac. There’s no need to produce any
complete.mar files here like regular release bits do because we can reuse those.
We’re need Linux chunked at the next step so this dummy takes care of that for the relatively simple path Linux follows. One task per sub config+locale combination, the same as Windows and Mac. This doesn’t need to exist for EME-free because we don’t need to create Linux builds there.
Mac & Windows:
This step GPG signs all platforms, and authenticode signs the Windows installer.
Moves and renames the artifacts to their public location in the candidates directory, or a private S3 bucket. Each task will
project:releng:beetmover:action:push-to-partner scope, with public uploads having
project:releng:beetmover:bucket:release and private uploads using
upload_to_candidates key in the partner config
controls the second scope. There’s a separate partner code path in beetmoverscript.
platforms: Mac & Windows
The EME-free builds should be present in our SHA256SUMS file and friends (e.g.) so we beetmove the target.checksums from
the beetmover tasks into the candidates directory. They get picked up by the
It’s very rare to need to update a partner repack differently from the original
release build but we retain that capability. A partner build with distribution name
based on a release Firefox build, will query for an update on the
release-cck-foo channel. If
the update server Balrog finds no rule for
that channel it will fallback to the
release channel. The update files for the regular releases do not
distribution/ directory, so the customizations are not modified.
Bug 1430254 is an example of an exception to this logic.