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build: add reusable headless Docker build environment #1475

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fd9808e
build: add linux/aarch64 Tycho target-environment profile
joaodinissf Jul 19, 2026
8c55de4
build: add a Docker build environment for headless DDK builds
joaodinissf Jul 19, 2026
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15 changes: 15 additions & 0 deletions ddk-parent/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -440,6 +440,21 @@
<osgi.arch>x86_64</osgi.arch>
</properties>
</profile>
<profile>
<activation>
<os>
<name>linux</name>
<arch>aarch64</arch>
<family>unix</family>
</os>
</activation>
<id>64bit_linux_aarch64</id>
<properties>
<osgi.os>linux</osgi.os>
<osgi.ws>gtk</osgi.ws>
<osgi.arch>aarch64</osgi.arch>
</properties>
</profile>
<profile>
<id>macosx</id>
<activation>
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9 changes: 9 additions & 0 deletions docker/Dockerfile
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@@ -0,0 +1,9 @@
FROM maven:3-eclipse-temurin-21-noble

# Native libraries for SWT on GTK 3 and the JDK's AWT, a virtual display for the UI tests, and unzip for ./mvnw,
# which otherwise downloads the .tar.gz that doesn't match its checksum.
RUN apt-get update \
&& apt-get install -y --no-install-recommends libgtk-3-0t64 librsvg2-common libxtst6 unzip xvfb \
&& rm -rf /var/lib/apt/lists/*

WORKDIR /workspace
26 changes: 26 additions & 0 deletions docker/README.md
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@@ -0,0 +1,26 @@
# DDK Docker build environment

A Linux image with Java, Maven, GTK and Xvfb, for running the full build and the UI tests headlessly on any machine with Docker (x86-64 or ARM64).

Build the image from the repository root:

```bash
docker build --pull -t ddk-build docker
```

Run any build command from [AGENTS.md](../AGENTS.md#build-commands) in it, for example the full CI build, which already starts with `xvfb-run`:

```bash
docker run --rm --init \
--mount "type=bind,source=${PWD},target=/workspace" \
--mount "type=volume,source=ddk-m2,target=/root/.m2" \
ddk-build \
<command from AGENTS.md>
```

In PowerShell, use `$PWD.Path` for the source and backticks for the line breaks, and quote `-D` arguments (`'-DskipTests'`).

- **Use a full clone, not a linked worktree:** a worktree's `.git` file points outside the mount, and Tycho's build qualifier then fails with `repository not found`.
- **`--init` is required:** without it `xvfb-run` runs as PID 1 and can hang before starting Maven.
- The `ddk-m2` volume keeps Maven and p2 downloads between runs; on a machine that builds both architectures, use one volume per architecture.
- The container runs as root, so on a Linux host the build output in the checkout is owned by root.