Adjust Dockerfile to use with nox -s build_linux.

Dockerfile

@@ -1,47 +1,42 @@
 FROM ubuntu:18.04
 
-ENV WORKDIR /src
-
-WORKDIR ${WORKDIR}
-
 RUN apt update \
     && apt install -y \
         python3.8 \
         libpython3.8 \
         python3.8-venv \
         python3-pip \
-    && true
-    # && rm -rf /var/lib/apt/lists/*
-
-ARG USER_UID="$UID"
-ARG USER_GID="$GID"
-ARG USER_HOME=/home/user
-
-RUN groupadd -r user -g "$USER_GID" && \
-    useradd -r -g user -u "$USER_UID" -m -d "${USER_HOME}" \
-    -s /bin/bash -c "User" user
-
-USER user
+    && rm -rf /var/lib/apt/lists/*
 
 ARG ROMT_PIP_VERSION=24.0
 ARG ROMT_PIPX_VERSION=1.5.0
 ARG ROMT_POETRY_VERSION=1.8.2
 ARG ROMT_POETRY_PLUGIN_EXPORT_VERSION=1.7.1
 
-# Add `~/.local/bin` directory to `PATH` for `pipx` binaries.
-ENV PATH="${PATH}:/home/user/.local/bin"
+ENV PIPX_HOME=/pipx-lib
+ENV PIPX_BIN_DIR=/usr/bin
 
 RUN python3.8 -m venv /tmp/pipx-venv
 RUN /tmp/pipx-venv/bin/pip install "pip==$ROMT_PIP_VERSION"
 RUN /tmp/pipx-venv/bin/pip install "pipx==$ROMT_PIPX_VERSION"
-RUN mkdir -p /home/user/.local/bin \
-  && ln -s /tmp/pipx-venv/bin/pipx /home/user/.local/bin/pipx
+RUN mkdir -p "$PIPX_HOME" \
+  && /tmp/pipx-venv/bin/pipx install "pipx==$ROMT_PIPX_VERSION"
+
 RUN pipx install "poetry==$ROMT_POETRY_VERSION" \
   && pipx inject poetry \
     "poetry-plugin-export==$ROMT_POETRY_PLUGIN_EXPORT_VERSION"
-RUN poetry config warnings.export false
 
 # Copy in project dependency specification that don't change often; this
 # speeds up incremental rebuilding of the container.
 COPY pyproject.toml poetry.lock ./
 RUN poetry install
+
+COPY README.rst \
+  maintainer.rst \
+  noxfile.py \
+  romt-wrapper.py \
+  ./
+
+# src/ must be mounted.
+
+ENTRYPOINT ["poetry", "run", "nox", "-s", "build"]

noxfile.py

@@ -169,6 +169,26 @@ def build(s: Session) -> None:
     shutil.copy(dist_exe_path, github_exe_path)
 
 
+@session(venv_backend="none")
+def build_linux(s: Session) -> None:
+    # Remove any stray container if it exists; use
+    # `success_codes` to prevent `nox` failure if the
+    # container does not exist and `docker rm` fails.
+    s.run("docker", "rm", "romt-build", success_codes=[0, 1])
+    s.run("docker", "build", ".", "-t", "romt-build")
+    s.run(
+        "docker",
+        "run",
+        "-v",
+        "./src:/src",
+        "--name",
+        "romt-build",
+        "romt-build",
+    )
+    s.run("docker", "cp", "romt-build:/dist/.", "dist/")
+    s.run("docker", "rm", "romt-build")
+
+
 @session(venv_backend="none")
 def release(s: Session) -> None:
     version = get_project_version()