Set installability analysis workflow (WIP)

.github/workflows/installability.yml

@@ -0,0 +1,37 @@
+name: Plugins
+
+on:
+  schedule:
+    # Every Monday and Thursday, at 6am
+    - cron: "0 6 * * 1,4"
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  packages:
+    name: Installability
+    runs-on: ubuntu-latest
+    if: startsWith(github.repository, 'napari')
+    strategy:
+      fail-fast: false
+      matrix:
+        subdir:
+          - "linux-64"
+          - "osx-64"
+          - "osx-arm64"
+          - "win-64"
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: mamba-org/provision-with-micromamba@main
+        with:
+          environment-file: environments/installability.yml
+      - name: Run script
+        shell: bash -el {0}
+        env:
+          CONDA_SUBDIR: ${{ matrix.subdir }}
+        run: python ci_scripts/check_installability_plugins.py
+

ci_scripts/check_installability_plugins.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+
+"""
+Check if all Hub-listed plugins can be installed together with latest napari
+"""
+
+import json
+from subprocess import CalledProcessError, check_output, STDOUT
+
+import requests
+
+NPE2API_CONDA = "https://npe2api.vercel.app/api/conda"
+
+
+def check_output_verbose(*args, **kwargs):
+    """
+    Check return code of a subprocess, capturing stdout and stderr.
+    If an error happened, print both streams, then raise.
+    """
+    kwargs.pop("stderr", None)
+    kwargs.pop("text", None)
+    kwargs.pop("universal_newlines", None)
+    try:
+        return check_output(*args, stderr=STDOUT, text=True, **kwargs)
+    except CalledProcessError as exc:
+        print("Output:")
+        print(exc.stdout)
+        raise
+
+
+def latest_napari_on_conda_forge():
+    r = requests.get("https://api.anaconda.org/package/conda-forge/napari")
+    r.raise_for_status()
+    return r.json()["latest_version"]
+
+
+def all_plugin_names():
+    r = requests.get(NPE2API_CONDA)
+    r.raise_for_status()
+    return r.json()
+
+
+def is_latest_version(name, version):
+    r = requests.get(f"{NPE2API_CONDA}/{name}")
+    r.raise_for_status()
+    latest_version = r.json()["latest_version"]
+    return version >= latest_version
+
+
+def solve(specs):
+    resp = check_output_verbose(
+        [
+            "micromamba",
+            "create",
+            "-n",
+            "notused",
+            "--dry-run",
+            "-c",
+            "conda-forge",
+            "--json",
+            *specs,
+        ]
+    )
+    print(resp)
+    return json.loads(resp)
+
+
+def main():
+    specs = [f"napari={latest_napari_on_conda_forge()}"]
+    plugin_names = all_plugin_names()
+    for _, conda_name in plugin_names.items():
+        if conda_name is not None:
+            specs.append(conda_name.replace("/", "::"))
+
+    result = solve(specs)
+
+
+if __name__ == "__main__":
+    main()

environments/installability.yml

@@ -0,0 +1,7 @@
+name: installability
+channels:
+  - conda-forge
+dependencies:
+  - conda
+  - mamba
+  - python