gecko-dev/taskcluster/docs/docker-images.rst

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.. taskcluster_dockerimages:
=============
Docker Images
=============
TaskCluster Docker images are defined in the source directory under
``taskcluster/docker``. Each directory therein contains the name of an
image used as part of the task graph.
Adding Extra Files to Images
============================
Dockerfile syntax has been extended to allow *any* file from the
source checkout to be added to the image build *context*. (Traditionally
you can only ``ADD`` files from the same directory as the Dockerfile.)
Simply add the following syntax as a comment in a Dockerfile::
# %include <path>
e.g.
# %include mach
# %include testing/mozharness
The argument to ``# %include`` is a relative path from the root level of
the source directory. It can be a file or a directory. If a file, only that
file will be added. If a directory, every file under that directory will be
added (even files that are untracked or ignored by version control).
Files added using ``# %include`` syntax are available inside the build
context under the ``topsrcdir/`` path.
Files are added as they exist on disk. e.g. executable flags should be
preserved. However, the file owner/group is changed to ``root`` and the
``mtime`` of the file is normalized.
Here is an example Dockerfile snippet::
# %include mach
ADD topsrcdir/mach /home/worker/mach