Version Control in CI¶
Upgrading Mercurial in CI requires touching a handful of different components.
robustcheckout Mercurial extension is used throughout CI to
perform clones and working directory updates. The canonical home of
the extension is in the
at the path
hgext/robustcheckout/__init__.py. A copy of the
extension is vendored at
When upgrading Mercurial, the
robustcheckout extension should also
be updated to ensure it is compatible with the version of Mercurial
being upgraded to. Typically, one simplies copies the latest version
version-control-tools into the vendored location.
Debian Packages for Debian Based Docker Images¶
taskcluster/ci/packages/kind.yml defines custom Debian packages for
Mercurial. These are installed in various Docker images.
To upgrade Mercurial, typically you just need to update the source URL and its hash in this file.
Non-Debian Linux Docker Images¶
taskcluster/docker/recipes/install-mercurial.sh script is sourced
by a handful of Docker images to install Mercurial.
The script references 3 tooltool artifacts:
- A Mercurial source tarball (for
The source tarball is a vanilla Mercurial source distribution. The Debian archives will need to be produced manually.
To produce the Debian archives,
hg clone https://www.mercurial-scm.org/repo/hg and
hg update to
the tag being built. Then run
make docker-ubuntu-xenial. This will
build the Mercurial Debian packages in a Docker container. It will deposit
the produced packages in
Once all 3 files are available, copy them to the same directory and upload them to tooltool.
$ tooltool.py add –public mercurial-x.y.z.tar.gz mercurial*.deb $ tooltool.py upload –message ‘Bug XXX - Mercurial x.y.z’ –authentication-file ~/.tooltoolauth
for how to use tooltool and where to obtain
Next, copy values from the
manifest.tt file into
taskcluster/docker/recipes/install-mercurial.sh. See revision
977768c296ca for an example upgrade.
https://github.com/mozilla-releng/OpenCloudConfig defines the Windows
environment for various Windows AMIs used by Taskcluster. Several of
the files reference a
mercurial-x.y.z-*.msi installer. These references
will need to be updated to the Mercurial version being upgraded to.
robustcheckout extension is also vendored into this repository
should also be updated if needed.
Puppet Maintained Hosts¶
Some hosts (namely macOS machines) are managed by Puppet and Puppet is used to install Mercurial.
Puppet code lives in the https://hg.mozilla.org/build/puppet repository.
Relevant files are in
modules/packages/manifests/mozilla/py27_mercurial*. A copy of
robustcheckout is also vendored at
The steps to upgrade Mercurial in Puppet aren’t currently captured here. Someone should capture those…