feat: log stderr

.github/workflows/installer.yml

@@ -19,6 +19,27 @@ concurrency:
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
+  unit-test:
+    name: ${{ matrix.python-version }}
+    runs-on: Ubuntu
+    strategy:
+      matrix:
+        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install pytest
+        run: python -m pip install pytest
+
+      - name: Run PyTest
+        run: python -m pytest ./tests
+
   default:
     name: ${{ matrix.os }} / ${{ matrix.python-version }} / install-poetry.py ${{ matrix.args }}
     runs-on: ${{ matrix.image }}

README.md

@@ -83,6 +83,16 @@ You can also install Poetry for a `git` repository by using the `--git` option:
 curl -sSL https://install.python-poetry.org | python3 - --git https://github.com/python-poetry/poetry.git@master
 ````
 
+If you need Poetry to write errors to stderr, you can use `--stderr` option or the `$POETRY_LOG_STDERR`
+environment variable:
+
+> _Note: In CI environments, this will be enabled automatically._
+
+```bash
+curl -sSL https://install.python-poetry.org | python3 - --stderr
+curl -sSL https://install.python-poetry.org | POETRY_LOG_STDERR=1 python3 -
+````
+
 > **Note**: The installer does not support Python < 3.6.
 
 ## Known Issues

install-poetry.py

@@ -898,6 +898,15 @@ def main():
             "of Poetry available online."
         ),
     )
+    parser.add_argument(
+        "--stderr",
+        dest="stderr",
+        action="store_true",
+        help=(
+            "Log installation errors to stderr instead of a log file."
+        ),
+        default=False
+    )
 
     args = parser.parse_args()
 
@@ -912,6 +921,15 @@ def main():
         git=args.git,
     )
 
+    disable_log_file = args.stderr or string_to_bool(os.getenv("POETRY_LOG_STDERR", "0"))
+
+    if not disable_log_file and string_to_bool(os.getenv("CI", "0")):
+        installer._write(
+            colorize("info", "CI environment detected. Writing logs to stderr.")
+        )
+        disable_log_file = True
+
+
     if args.uninstall or string_to_bool(os.getenv("POETRY_UNINSTALL", "0")):
         return installer.uninstall()
 
@@ -923,15 +941,22 @@ def main():
         if e.log is not None:
             import traceback
 
-            _, path = tempfile.mkstemp(
-                suffix=".log",
-                prefix="poetry-installer-error-",
-                dir=str(Path.cwd()),
-                text=True,
+            error = (
+                f"{e.log}\n"
+                f"Traceback:\n\n{''.join(traceback.format_tb(e.__traceback__))}"
             )
-            installer._write(colorize("error", f"See {path} for error logs."))
-            text = f"{e.log}\nTraceback:\n\n{''.join(traceback.format_tb(e.__traceback__))}"
-            Path(path).write_text(text)
+
+            if disable_log_file:
+                installer._write(colorize("error", error))
+            else:
+                _, path = tempfile.mkstemp(
+                    suffix=".log",
+                    prefix="poetry-installer-error-",
+                    dir=str(Path.cwd()),
+                    text=True,
+                )
+                installer._write(colorize("error", f"See {path} for error logs."))
+                Path(path).write_text(error)
 
         return e.return_code
 

tests/test_install_poetry.py

@@ -0,0 +1,148 @@
+from unittest.mock import MagicMock, patch
+import re
+import typing
+import importlib
+import unittest
+
+
+module = importlib.import_module("install-poetry")
+
+
+class InstallPoetryTestCase(unittest.TestCase):
+    def setUp(self):
+        self.__patchers = []
+
+        self.__patchers.append(patch("install-poetry.Installer"))
+        self.__mock_installer_cls = self.__patchers[-1].start()
+        self.__installer = MagicMock()
+        self.__mock_installer_cls.return_value = self.__installer
+
+        self.__patchers.append(patch("install-poetry.argparse.ArgumentParser"))
+        self.__mock_argument_parser_cls = self.__patchers[-1].start()
+        self.__parser = MagicMock()
+        self.__args = MagicMock()
+        self.__args.version = None
+        self.__args.preview = False
+        self.__args.force = False
+        self.__args.accept_all = False
+        self.__args.path = None
+        self.__args.git = None
+        self.__args.stderr = False
+        self.__args.uninstall = False
+        self.__mock_argument_parser_cls.return_value = self.__parser
+        self.__parser.parse_args.return_value = self.__args
+
+        self.__patchers.append(patch("install-poetry.os"))
+        self.__mock_os = self.__patchers[-1].start()
+        self.__mock_os.getenv.side_effect = self.__getenv
+        self.__env = {}
+
+        self.__patchers.append(patch("install-poetry.colorize"))
+        self.__mock_colorize = self.__patchers[-1].start()
+        self.__mock_colorize.side_effect = self.__colorize
+        self.__messages = []
+
+        self.__patchers.append(patch("install-poetry.tempfile"))
+        self.__mock_tempfile = self.__patchers[-1].start()
+        self.__mock_tempfile.mkstemp.side_effect = self.__mkstemp
+        self.__tmp_file = None
+
+        self.__patchers.append(patch("install-poetry.Path"))
+        self.__mock_path_cls = self.__patchers[-1].start()
+
+    def tearDown(self):
+        for patcher in self.__patchers:
+            patcher.stop()
+
+    def test_install_poetry_main__happy(self):
+        self.__installer.run.return_value = 0
+
+        return_code = module.main()
+
+        self.__mock_installer_cls.assert_called_with(
+            version=None,
+            preview=False,
+            force=False,
+            accept_all=True,
+            path=None,
+            git=None
+        )
+
+        self.__installer.uninstall.assert_not_called()
+
+        self.assertEqual(return_code, 0)
+
+    def test_install_poetry_main__default_install_error(self):
+        self.__installer.run.side_effect = [
+            module.PoetryInstallationError(1, "a fake poetry installation error")
+        ]
+
+        return_code = module.main()
+
+        self.__assert_no_matching_message("error", re.compile("a fake poetry installation error"))
+        self.__assert_any_matching_message("error", re.compile(f"See {self.__tmp_file} for error logs"))
+
+        self.assertEqual(return_code, 1)
+        self.__mock_path_cls(self.__tmp_file).write_text.assert_called_once()
+
+    def test_install_poetry_main__stderr_arg(self):
+        self.__args.stderr = True
+        self.__installer.run.side_effect = [
+            module.PoetryInstallationError(1, "a fake poetry installation error")
+        ]
+
+        return_code = module.main()
+
+        self.__assert_no_matching_message("info", re.compile("CI environment detected"))
+        self.__assert_any_matching_message("error", re.compile("a fake poetry installation error"))
+
+        self.assertEqual(return_code, 1)
+        self.__mock_path_cls.assert_not_called()
+
+    def test_install_poetry_main__log_stderr_var(self):
+        self.__env["POETRY_LOG_STDERR"] = "1"
+        self.__installer.run.side_effect = [
+            module.PoetryInstallationError(1, "a fake poetry installation error")
+        ]
+
+        return_code = module.main()
+
+        self.__assert_no_matching_message("info", re.compile("CI environment detected"))
+        self.__assert_any_matching_message("error", re.compile("a fake poetry installation error"))
+
+        self.assertEqual(return_code, 1)
+        self.__mock_path_cls.assert_not_called()
+
+    def test_install_poetry_main__ci(self):
+        self.__env["CI"] = "1"
+        self.__installer.run.side_effect = [
+            module.PoetryInstallationError(1, "a fake poetry installation error")
+        ]
+
+        return_code = module.main()
+
+        self.__assert_any_matching_message("info", re.compile("CI environment detected"))
+        self.__assert_any_matching_message("error", re.compile("a fake poetry installation error"))
+
+        self.assertEqual(return_code, 1)
+        self.__mock_path_cls.assert_not_called()
+
+    def __colorize(self, severity: str, message: str) -> str:
+        self.__messages.append((severity, message))
+        return f"{severity}:{message}"
+
+    def __getenv(self, key: str, default: typing.Optional[str] = None) -> typing.Optional[str]:
+        return self.__env.get(key, default)
+
+    def __mkstemp(self, suffix="suffix", prefix="prefix", dir=None, text=None):
+        self.__tmp_file = f"{prefix}unittest{suffix}"
+        return None, self.__tmp_file
+
+    def __assert_any_matching_message(self, severity: str, pattern: re.Pattern):
+        self.assertGreater(self.__count_matching_message(severity, pattern), 0)
+
+    def __assert_no_matching_message(self, severity: str, pattern: re.Pattern):
+        self.assertEqual(self.__count_matching_message(severity, pattern), 0)
+
+    def __count_matching_message(self, severity: str, pattern: re.Pattern):
+        return len([message for message in self.__messages if severity == message[0] and pattern.search(message[1])])