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From fc8e412fa8fe524ab3f112f02e865aa42608388b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jakub=20Kul=C3=ADk?= <Kulikjak@gmail.com>
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Date: Thu, 27 Apr 2023 18:52:38 +0200
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Subject: [PATCH] prevent PermissionError when using venv creator on some
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systems (#2543)
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Cherry-picked from 0597a2f8ab32705b86a25dbd1d42fd30c3033061
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---
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docs/changelog/2543.bugfix.rst | 2 ++
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src/virtualenv/activation/via_template.py | 4 ++++
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tests/unit/create/test_creator.py | 22 ++++++++++++++++++++++
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3 files changed, 28 insertions(+)
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create mode 100644 docs/changelog/2543.bugfix.rst
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diff --git a/docs/changelog/2543.bugfix.rst b/docs/changelog/2543.bugfix.rst
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new file mode 100644
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index 0000000..5f0d6ca
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--- /dev/null
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+++ b/docs/changelog/2543.bugfix.rst
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@@ -0,0 +1,2 @@
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+Prevent ``PermissionError`` when using venv creator on systems that deliver files without user write
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+permission - by :user:`kulikjak`.
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diff --git a/src/virtualenv/activation/via_template.py b/src/virtualenv/activation/via_template.py
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index 069d52e..cc9dbda 100644
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--- a/src/virtualenv/activation/via_template.py
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+++ b/src/virtualenv/activation/via_template.py
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@@ -41,6 +41,10 @@ class ViaTemplateActivator(Activator, metaclass=ABCMeta):
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for template in templates:
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text = self.instantiate_template(replacements, template, creator)
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dest = to_folder / self.as_name(template)
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+ # remove the file if it already exists - this prevents permission
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+ # errors when the dest is not writable
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+ if dest.exists():
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+ dest.unlink()
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# use write_bytes to avoid platform specific line normalization (\n -> \r\n)
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dest.write_bytes(text.encode("utf-8"))
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generated.append(dest)
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diff --git a/tests/unit/create/test_creator.py b/tests/unit/create/test_creator.py
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index ea61ed0..0ec6d62 100644
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--- a/tests/unit/create/test_creator.py
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+++ b/tests/unit/create/test_creator.py
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@@ -690,3 +690,25 @@ def test_py_pyc_missing(tmp_path, mocker, py, pyc):
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pyc_at = Python2.from_stdlib(Python2.mappings(CURRENT), "osc.py")[1](result.creator, Path("os.pyc"))
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assert pyc_at.exists() is pyc
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+
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+
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+# Make sure that the venv creator works on systems where vendor-delivered files
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+# (specifically venv scripts delivered with Python itself) are not writable.
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+#
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+# https://github.com/pypa/virtualenv/issues/2419
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+@pytest.mark.skipif("venv" not in CURRENT_CREATORS, reason="test needs venv creator")
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+def test_venv_creator_without_write_perms(tmp_path, mocker):
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+ from virtualenv.run.session import Session
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+
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+ prev = Session._create
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+
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+ def func(self):
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+ prev(self)
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+ scripts_dir = self.creator.dest / "bin"
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+ for script in scripts_dir.glob("*ctivate*"):
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+ script.chmod(stat.S_IREAD | stat.S_IRGRP | stat.S_IROTH)
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+
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+ mocker.patch("virtualenv.run.session.Session._create", side_effect=func, autospec=True)
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+
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+ cmd = [str(tmp_path), "--seeder", "app-data", "--without-pip", "--creator", "venv"]
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+ cli_run(cmd)
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--
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2.40.0
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