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-rw-r--r--.github/workflows/poetry_lockfile.yaml24
-rw-r--r--changelog.d/14742.misc1
-rw-r--r--poetry.lock2
-rw-r--r--pyproject.toml3
-rwxr-xr-xscripts-dev/check_locked_deps_have_sdists.py58
5 files changed, 87 insertions, 1 deletions
diff --git a/.github/workflows/poetry_lockfile.yaml b/.github/workflows/poetry_lockfile.yaml
new file mode 100644
index 0000000000..ae4d27f2de
--- /dev/null
+++ b/.github/workflows/poetry_lockfile.yaml
@@ -0,0 +1,24 @@
+on:
+  push:
+    branches: ["develop", "release-*"]
+    paths:
+      - poetry.lock
+  pull_request:
+    paths:
+      - poetry.lock
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-sdists:
+    name: "Check locked dependencies have sdists"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+      - run: pip install tomli
+      - run: ./scripts-dev/check_locked_deps_have_sdists.py
diff --git a/changelog.d/14742.misc b/changelog.d/14742.misc
new file mode 100644
index 0000000000..c0b5d2c062
--- /dev/null
+++ b/changelog.d/14742.misc
@@ -0,0 +1 @@
+Add check to ensure locked dependencies have source distributions available.
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 688fd2ac26..e534b30d2b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -3027,4 +3027,4 @@ user-search = ["pyicu"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7.1"
-content-hash = "16528ddab686d1bc3180ff37b09de35b904f68516cfdcc3942844163a126255e"
+content-hash = "95cb043fa56e1e3275ba7f74b68b2191bd5886eea3e06b8cd370d7fc9fea3c07"
diff --git a/pyproject.toml b/pyproject.toml
index 21621510c8..880f2d3bd8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -346,6 +346,9 @@ twine = "*"
 # Towncrier min version comes from #3425. Rationale unclear.
 towncrier = ">=18.6.0rc1"
 
+# Used for checking the Poetry lockfile
+tomli = ">=1.2.3"
+
 [build-system]
 # The upper bounds here are defensive, intended to prevent situations like
 # #13849 and #14079 where we see buildtime or runtime errors caused by build
diff --git a/scripts-dev/check_locked_deps_have_sdists.py b/scripts-dev/check_locked_deps_have_sdists.py
new file mode 100755
index 0000000000..63ad99280a
--- /dev/null
+++ b/scripts-dev/check_locked_deps_have_sdists.py
@@ -0,0 +1,58 @@
+#! /usr/bin/env python
+# Copyright 2022 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import sys
+from pathlib import Path
+from typing import Dict, List
+
+import tomli
+
+
+def main() -> None:
+    lockfile_path = Path(__file__).parent.parent.joinpath("poetry.lock")
+    with open(lockfile_path, "rb") as lockfile:
+        lockfile_content = tomli.load(lockfile)
+
+    # Poetry 1.3+ lockfile format:
+    # There's a `files` inline table in each [[package]]
+    packages_to_assets: Dict[str, List[Dict[str, str]]] = {
+        package["name"]: package["files"] for package in lockfile_content["package"]
+    }
+
+    success = True
+
+    for package_name, assets in packages_to_assets.items():
+        has_sdist = any(asset["file"].endswith(".tar.gz") for asset in assets)
+        if not has_sdist:
+            success = False
+            print(
+                f"Locked package {package_name!r} does not have a source distribution!",
+                file=sys.stderr,
+            )
+
+    if not success:
+        print(
+            "\nThere were some problems with the Poetry lockfile (poetry.lock).",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+
+    print(
+        f"Poetry lockfile OK. {len(packages_to_assets)} locked packages checked.",
+        file=sys.stderr,
+    )
+
+
+if __name__ == "__main__":
+    main()