Add req_check session; build_linux with Docker.

noxfile.py

@@ -13,7 +13,7 @@
 
 nox.options.error_on_external_run = True
 nox.options.reuse_existing_virtualenvs = True
-nox.options.sessions = ["lint", "type_check", "test"]
+nox.options.sessions = ["lint", "type_check", "test", "req_check"]
 
 
 def get_project_version() -> str:
@@ -109,6 +109,22 @@ def type_check(s: Session) -> None:
     s.run("mypy", "src", "tests", "noxfile.py")
 
 
+@session(venv_backend="none")
+def req_check(s: Session) -> None:
+    expected = s.run_always(
+        "poetry",
+        "export",
+        external=True,
+        silent=True,
+    )
+    actual = open("requirements.txt").read()
+    if actual != expected:
+        s.error(
+            "`requirements.txt` is out-of-date (run: \n"
+            "poetry export -o requirements.txt)",
+        )
+
+
 # Note: This `reuse_venv` does not yet have effect due to:
 #   https://github.com/wntrblm/nox/issues/488
 @session(reuse_venv=False)
@@ -117,20 +133,20 @@ def licenses(s: Session) -> None:
     # file directly on Windows, so only use the name and allow Poetry to
     # re-create it.
     with NamedTemporaryFile() as t:
-        requirements_file = Path(t.name)
+        requirements_path = Path(t.name)
 
     # Install dependencies without installing the package itself:
     #   https://github.com/cjolowicz/nox-poetry/issues/680
     s.run_always(
         "poetry",
         "export",
         "--without-hashes",
-        f"--output={requirements_file}",
+        f"--output={requirements_path}",
         external=True,
     )
-    s.install("pip-licenses", "-r", str(requirements_file))
+    s.install("pip-licenses", "-r", str(requirements_path))
     s.run("pip-licenses", *s.posargs)
-    requirements_file.unlink()
+    requirements_path.unlink()
 
 
 @session(venv_backend="none")
@@ -197,8 +213,9 @@ def release(s: Session) -> None:
     rmtree(Path("dist"))
     rmtree(Path("build"))
     s.log("NOTE: safe to perform Windows steps now...")
-    build(s)
-    s.run("poetry", "export", "-o", "requirements.txt")
+    s.run("poetry", "install")
+    # Build the `romt` executable for Linux:
+    build_linux(s)
     s.run("poetry", "build")
     s.run("twine", "check", str(tar_path), str(whl_path))
     print(
@@ -208,6 +225,8 @@ def release(s: Session) -> None:
 
         On Windows machine:
           poetry run nox -s build
+        Alternatively, unzip from CI:
+          unzip -d dist/ dist-windows-latest.zip
 
         Tag and push:
           git tag -am 'Release v{version}.' v{version}