Convert python-2.7.15.amd64.msi to a ZIP file, for generic-worker mount

etc/taskcluster/decision-task.py

@@ -30,6 +30,7 @@ def main():
 
 ping_on_daily_task_failure = "SimonSapin, nox, emilio"
 build_artifacts_expiry = "1 week"
+build_dependencies_artifacts_expiry = "1 month"
 log_artifacts_expiry = "1 year"
 
 build_env = {
@@ -96,12 +97,20 @@ def android_arm32():
 
 
 def windows_dev():
+    python27_task = extract_msi(
+        "https://www.python.org/ftp/python/2.7.15/python-2.7.15.amd64.msi",
+        sha256="5e85f3c4c209de98480acbf2ba2e71a907fd5567a838ad4b6748c76deb286ad7",
+    )
     return decision.create_task(
-        task_name="Windows x86_64: clone only",
+        task_name="Windows x86_64: clone only (for now)",
         worker_type="servo-win2016",
+        # script="""
+        #     python mach --help
+        # """,
         script="""
-            dir
+            python -c "import sys; print(sys.path)"
         """,
+        with_repo=False,
         mounts=[
             {
                 "directory": "git",
@@ -112,10 +121,20 @@ def windows_dev():
                     "sha256": "424d24b5fc185a9c5488d7872262464f2facab4f1d4693ea8008196f14a3c19b",
                 }
             },
+            {
+                "directory": "python2",
+                "format": "tar.gz",
+                "content": {
+                    "artifact": "public/extracted.tar.gz",
+                    "taskId": python27_task,
+                }
+            },
         ],
         homedir_path=[
             "git\\cmd",
+            "python2",
         ],
+        dependencies=[python27_task],
         **build_kwargs
     )
 
@@ -238,6 +257,38 @@ def daily_tasks_setup():
     decision.task_name_template = "Servo daily: %s. On failure, ping: " + ping_on_daily_task_failure
 
 
+def extract_msi(url, sha256):
+    return decision.find_or_create_task(
+        index_bucket="extract-msi.v4",
+        index_key=sha256,
+        index_expiry=build_dependencies_artifacts_expiry,
+
+        task_name="Extracting MSI file " + url,
+        dockerfile=dockerfile_path("msiextract"),
+        script="""
+            curl --retry 5 --connect-timeout 10 --location --fail "$MSI_URL" -o input.msi
+            echo "$EXPECTED_SHA256 input.msi" | sha256sum --check
+            msiextract input.msi -C output
+
+            # May contains directories with names too long for Windows to even create:
+            # https://gitlab.gnome.org/GNOME/msitools/issues/5
+            rm -rf output/Windows/winsxs
+
+            ls output/
+            tar -czf /extracted.tar.gz -C output .
+        """,
+        env={
+            "MSI_URL": url,
+            "EXPECTED_SHA256": sha256,
+        },
+        artifacts=[
+            "/extracted.tar.gz"
+        ],
+        max_run_time_minutes=20,
+        with_repo=False,
+    )
+
+
 def dockerfile_path(name):
     return os.path.join(os.path.dirname(__file__), "docker", name + ".dockerfile")
 
@@ -246,6 +297,7 @@ decision = DecisionTask(
     task_name_template="Servo: %s",
     index_prefix="project.servo.servo",
     default_worker_type="servo-docker-worker",
+    docker_image_cache_expiry=build_dependencies_artifacts_expiry,
 )
 
 # https://docs.taskcluster.net/docs/reference/workers/docker-worker/docs/caches

etc/taskcluster/docker/msiextract.dockerfile

@@ -0,0 +1,47 @@
+# Build a version of libgcal that includes commit
+# https://gitlab.gnome.org/GNOME/gcab/commit/3365b4bd58dd7f13e786caf3c7234cf8116263d9
+# which fixes "Invalid cabinet chunk" errors:
+# https://gitlab.gnome.org/GNOME/msitools/issues/4#note_336695
+FROM ubuntu:bionic-20180821
+RUN \
+    apt-get update -q && \
+    apt-get install -qy --no-install-recommends \
+        curl \
+        ca-certificates \
+        #
+        # Build dependencies for libgcab
+        meson \
+        git \
+        pkg-config \
+        libc6-dev \
+        libglib2.0-dev \
+        libgirepository1.0-dev \
+        gobject-introspection \
+        valac \
+        intltool \
+    && \
+    export REV=3365b4bd58dd7f13e786caf3c7234cf8116263d9 && \
+    curl -L https://gitlab.gnome.org/GNOME/gcab/-/archive/$REV/gcab-$REV.tar.gz | tar -xz && \
+    mv gcab-$REV gcab && \
+    cd gcab && \
+    meson build && \
+    cd build && \
+    # UTF-8 locale to work around https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870310
+    export LANG=C.UTF-8 && \
+    ninja && \
+    cp -v libgcab/libgcab* /usr/local/lib
+
+
+# FIXME: uncomment this after we upgrade docker-worker
+# to a version of Docker that supports multi-stage builds:
+
+# # Start a new image without the build dependencies, only the compiled library
+# FROM ubuntu:bionic-20180821
+# COPY --from=0 /usr/local/lib/libgcab* /usr/local/lib/
+
+RUN \
+    apt-get update -q && \
+    apt-get install -qy --no-install-recommends \
+        curl \
+        ca-certificates \
+        msitools