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virtualenv.rs
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virtualenv.rs
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//! Create a virtual environment.
use std::env::consts::EXE_SUFFIX;
use std::io;
use std::io::{BufWriter, Write};
use std::path::Path;
use fs_err as fs;
use fs_err::File;
use itertools::Itertools;
use tracing::debug;
use pypi_types::Scheme;
use uv_fs::{cachedir, Simplified, CWD};
use uv_python::{Interpreter, VirtualEnvironment};
use uv_version::version;
use crate::{Error, Prompt};
/// Activation scripts for the environment, with dependent paths templated out.
const ACTIVATE_TEMPLATES: &[(&str, &str)] = &[
("activate", include_str!("activator/activate")),
("activate.csh", include_str!("activator/activate.csh")),
("activate.fish", include_str!("activator/activate.fish")),
("activate.nu", include_str!("activator/activate.nu")),
("activate.ps1", include_str!("activator/activate.ps1")),
("activate.bat", include_str!("activator/activate.bat")),
("deactivate.bat", include_str!("activator/deactivate.bat")),
("pydoc.bat", include_str!("activator/pydoc.bat")),
(
"activate_this.py",
include_str!("activator/activate_this.py"),
),
];
const VIRTUALENV_PATCH: &str = include_str!("_virtualenv.py");
/// Very basic `.cfg` file format writer.
fn write_cfg(f: &mut impl Write, data: &[(String, String)]) -> io::Result<()> {
for (key, value) in data {
writeln!(f, "{key} = {value}")?;
}
Ok(())
}
/// Create a [`VirtualEnvironment`] at the given location.
#[allow(clippy::fn_params_excessive_bools)]
pub(crate) fn create(
location: &Path,
interpreter: &Interpreter,
prompt: Prompt,
system_site_packages: bool,
allow_existing: bool,
relocatable: bool,
seed: bool,
) -> Result<VirtualEnvironment, Error> {
// Determine the base Python executable; that is, the Python executable that should be
// considered the "base" for the virtual environment. This is typically the Python executable
// from the [`Interpreter`]; however, if the interpreter is a virtual environment itself, then
// the base Python executable is the Python executable of the interpreter's base interpreter.
let base_python = if cfg!(unix) {
// On Unix, follow symlinks to resolve the base interpreter, since the Python executable in
// a virtual environment is a symlink to the base interpreter.
uv_fs::canonicalize_executable(interpreter.sys_executable())?
} else if cfg!(windows) {
// On Windows, follow `virtualenv`. If we're in a virtual environment, use
// `sys._base_executable` if it exists; if not, use `sys.base_prefix`. For example, with
// Python installed from the Windows Store, `sys.base_prefix` is slightly "incorrect".
//
// If we're _not_ in a virtual environment, use the interpreter's executable, since it's
// already a "system Python". We canonicalize the path to ensure that it's real and
// consistent, though we don't expect any symlinks on Windows.
if interpreter.is_virtualenv() {
if let Some(base_executable) = interpreter.sys_base_executable() {
base_executable.to_path_buf()
} else {
// Assume `python.exe`, though the exact executable name is never used (below) on
// Windows, only its parent directory.
interpreter.sys_base_prefix().join("python.exe")
}
} else {
interpreter.sys_executable().to_path_buf()
}
} else {
unimplemented!("Only Windows and Unix are supported")
};
// Validate the existing location.
match location.metadata() {
Ok(metadata) => {
if metadata.is_file() {
return Err(Error::Io(io::Error::new(
io::ErrorKind::AlreadyExists,
format!("File exists at `{}`", location.user_display()),
)));
} else if metadata.is_dir() {
if allow_existing {
debug!("Allowing existing directory");
} else if location.join("pyvenv.cfg").is_file() {
debug!("Removing existing directory");
fs::remove_dir_all(location)?;
fs::create_dir_all(location)?;
} else if location
.read_dir()
.is_ok_and(|mut dir| dir.next().is_none())
{
debug!("Ignoring empty directory");
} else {
return Err(Error::Io(io::Error::new(
io::ErrorKind::AlreadyExists,
format!(
"The directory `{}` exists, but it's not a virtualenv",
location.user_display()
),
)));
}
}
}
Err(err) if err.kind() == io::ErrorKind::NotFound => {
fs::create_dir_all(location)?;
}
Err(err) => return Err(Error::Io(err)),
}
let location = std::path::absolute(location)?;
let bin_name = if cfg!(unix) {
"bin"
} else if cfg!(windows) {
"Scripts"
} else {
unimplemented!("Only Windows and Unix are supported")
};
let scripts = location.join(&interpreter.virtualenv().scripts);
let prompt = match prompt {
Prompt::CurrentDirectoryName => CWD
.file_name()
.map(|name| name.to_string_lossy().to_string()),
Prompt::Static(value) => Some(value),
Prompt::None => None,
};
// Add the CACHEDIR.TAG.
cachedir::ensure_tag(&location)?;
// Create a `.gitignore` file to ignore all files in the venv.
fs::write(location.join(".gitignore"), "*")?;
// Per PEP 405, the Python `home` is the parent directory of the interpreter.
let python_home = base_python.parent().ok_or_else(|| {
io::Error::new(
io::ErrorKind::NotFound,
"The Python interpreter needs to have a parent directory",
)
})?;
// Different names for the python interpreter
fs::create_dir_all(&scripts)?;
let executable = scripts.join(format!("python{EXE_SUFFIX}"));
#[cfg(unix)]
{
uv_fs::replace_symlink(&base_python, &executable)?;
uv_fs::replace_symlink(
"python",
scripts.join(format!("python{}", interpreter.python_major())),
)?;
uv_fs::replace_symlink(
"python",
scripts.join(format!(
"python{}.{}",
interpreter.python_major(),
interpreter.python_minor(),
)),
)?;
if interpreter.markers().implementation_name() == "pypy" {
uv_fs::replace_symlink(
"python",
scripts.join(format!("pypy{}", interpreter.python_major())),
)?;
uv_fs::replace_symlink("python", scripts.join("pypy"))?;
}
if interpreter.markers().implementation_name() == "graalpy" {
uv_fs::replace_symlink("python", scripts.join("graalpy"))?;
}
}
// No symlinking on Windows, at least not on a regular non-dev non-admin Windows install.
if cfg!(windows) {
copy_launcher_windows(
WindowsExecutable::Python,
interpreter,
&base_python,
&scripts,
python_home,
)?;
if interpreter.markers().implementation_name() == "graalpy" {
copy_launcher_windows(
WindowsExecutable::GraalPy,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PythonMajor,
interpreter,
&base_python,
&scripts,
python_home,
)?;
} else {
copy_launcher_windows(
WindowsExecutable::Pythonw,
interpreter,
&base_python,
&scripts,
python_home,
)?;
}
if interpreter.markers().implementation_name() == "pypy" {
copy_launcher_windows(
WindowsExecutable::PythonMajor,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PythonMajorMinor,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PyPy,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PyPyMajor,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PyPyMajorMinor,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PyPyw,
interpreter,
&base_python,
&scripts,
python_home,
)?;
copy_launcher_windows(
WindowsExecutable::PyPyMajorMinorw,
interpreter,
&base_python,
&scripts,
python_home,
)?;
}
}
#[cfg(not(any(unix, windows)))]
{
compile_error!("Only Windows and Unix are supported")
}
// Add all the activate scripts for different shells
for (name, template) in ACTIVATE_TEMPLATES {
let path_sep = if cfg!(windows) { ";" } else { ":" };
let relative_site_packages = [
interpreter.virtualenv().purelib.as_path(),
interpreter.virtualenv().platlib.as_path(),
]
.iter()
.dedup()
.map(|path| {
pathdiff::diff_paths(path, &interpreter.virtualenv().scripts)
.expect("Failed to calculate relative path to site-packages")
})
.map(|path| path.simplified().to_str().unwrap().replace('\\', "\\\\"))
.join(path_sep);
let virtual_env_dir = match (relocatable, name.to_owned()) {
(true, "activate") => {
// Extremely verbose, but should cover all major POSIX shells,
// as well as platforms where `readlink` does not implement `-f`.
r#"'"$(dirname -- "$(CDPATH= cd -- "$(dirname -- "$SCRIPT_PATH")" > /dev/null && echo "$PWD")")"'"#
}
(true, "activate.bat") => r"%~dp0..",
(true, "activate.fish") => {
r#"'"$(dirname -- "$(cd "$(dirname -- "$(status -f)")"; and pwd)")"'"#
}
// Note:
// * relocatable activate scripts appear not to be possible in csh and nu shell
// * `activate.ps1` is already relocatable by default.
_ => {
// SAFETY: `unwrap` is guaranteed to succeed because `location` is an `Utf8PathBuf`.
location.simplified().to_str().unwrap()
}
};
let activator = template
.replace("{{ VIRTUAL_ENV_DIR }}", virtual_env_dir)
.replace("{{ BIN_NAME }}", bin_name)
.replace(
"{{ VIRTUAL_PROMPT }}",
prompt.as_deref().unwrap_or_default(),
)
.replace("{{ PATH_SEP }}", path_sep)
.replace("{{ RELATIVE_SITE_PACKAGES }}", &relative_site_packages);
fs::write(scripts.join(name), activator)?;
}
let mut pyvenv_cfg_data: Vec<(String, String)> = vec![
(
"home".to_string(),
python_home.simplified_display().to_string(),
),
(
"implementation".to_string(),
interpreter
.markers()
.platform_python_implementation()
.to_string(),
),
("uv".to_string(), version().to_string()),
(
"version_info".to_string(),
interpreter.markers().python_full_version().string.clone(),
),
(
"include-system-site-packages".to_string(),
if system_site_packages {
"true".to_string()
} else {
"false".to_string()
},
),
];
if relocatable {
pyvenv_cfg_data.push(("relocatable".to_string(), "true".to_string()));
}
if seed {
pyvenv_cfg_data.push(("seed".to_string(), "true".to_string()));
}
if let Some(prompt) = prompt {
pyvenv_cfg_data.push(("prompt".to_string(), prompt));
}
if cfg!(windows) && interpreter.markers().implementation_name() == "graalpy" {
pyvenv_cfg_data.push((
"venvlauncher_command".to_string(),
python_home
.join("graalpy.exe")
.simplified_display()
.to_string(),
));
}
let mut pyvenv_cfg = BufWriter::new(File::create(location.join("pyvenv.cfg"))?);
write_cfg(&mut pyvenv_cfg, &pyvenv_cfg_data)?;
drop(pyvenv_cfg);
// Construct the path to the `site-packages` directory.
let site_packages = location.join(&interpreter.virtualenv().purelib);
fs::create_dir_all(&site_packages)?;
// If necessary, create a symlink from `lib64` to `lib`.
// See: https://github.com/python/cpython/blob/b228655c227b2ca298a8ffac44d14ce3d22f6faa/Lib/venv/__init__.py#L135C11-L135C16
#[cfg(unix)]
if interpreter.pointer_size().is_64()
&& interpreter.markers().os_name() == "posix"
&& interpreter.markers().sys_platform() != "darwin"
{
match std::os::unix::fs::symlink("lib", location.join("lib64")) {
Ok(()) => {}
Err(err) if err.kind() == io::ErrorKind::AlreadyExists => {}
Err(err) => {
return Err(err.into());
}
}
}
// Populate `site-packages` with a `_virtualenv.py` file.
fs::write(site_packages.join("_virtualenv.py"), VIRTUALENV_PATCH)?;
fs::write(site_packages.join("_virtualenv.pth"), "import _virtualenv")?;
Ok(VirtualEnvironment {
scheme: Scheme {
purelib: location.join(&interpreter.virtualenv().purelib),
platlib: location.join(&interpreter.virtualenv().platlib),
scripts: location.join(&interpreter.virtualenv().scripts),
data: location.join(&interpreter.virtualenv().data),
include: location.join(&interpreter.virtualenv().include),
},
root: location,
executable,
})
}
#[derive(Debug, Copy, Clone)]
enum WindowsExecutable {
/// The `python.exe` executable (or `venvlauncher.exe` launcher shim).
Python,
/// The `python3.exe` executable (or `venvlauncher.exe` launcher shim).
PythonMajor,
/// The `python3.<minor>.exe` executable (or `venvlauncher.exe` launcher shim).
PythonMajorMinor,
/// The `pythonw.exe` executable (or `venvwlauncher.exe` launcher shim).
Pythonw,
/// The `pypy.exe` executable.
PyPy,
/// The `pypy3.exe` executable.
PyPyMajor,
/// The `pypy3.<minor>.exe` executable.
PyPyMajorMinor,
/// The `pypyw.exe` executable.
PyPyw,
/// The `pypy3.<minor>w.exe` executable.
PyPyMajorMinorw,
// The `graalpy.exe` executable
GraalPy,
}
impl WindowsExecutable {
/// The name of the Python executable.
fn exe(self, interpreter: &Interpreter) -> String {
match self {
WindowsExecutable::Python => String::from("python.exe"),
WindowsExecutable::PythonMajor => {
format!("python{}.exe", interpreter.python_major())
}
WindowsExecutable::PythonMajorMinor => {
format!(
"python{}.{}.exe",
interpreter.python_major(),
interpreter.python_minor()
)
}
WindowsExecutable::Pythonw => String::from("pythonw.exe"),
WindowsExecutable::PyPy => String::from("pypy.exe"),
WindowsExecutable::PyPyMajor => {
format!("pypy{}.exe", interpreter.python_major())
}
WindowsExecutable::PyPyMajorMinor => {
format!(
"pypy{}.{}.exe",
interpreter.python_major(),
interpreter.python_minor()
)
}
WindowsExecutable::PyPyw => String::from("pypyw.exe"),
WindowsExecutable::PyPyMajorMinorw => {
format!(
"pypy{}.{}w.exe",
interpreter.python_major(),
interpreter.python_minor()
)
}
WindowsExecutable::GraalPy => String::from("graalpy.exe"),
}
}
/// The name of the launcher shim.
fn launcher(self) -> &'static str {
match self {
WindowsExecutable::Python => "venvlauncher.exe",
WindowsExecutable::PythonMajor => "venvlauncher.exe",
WindowsExecutable::PythonMajorMinor => "venvlauncher.exe",
WindowsExecutable::Pythonw => "venvwlauncher.exe",
// From 3.13 on these should replace the `python.exe` and `pythonw.exe` shims.
// These are not relevant as of now for PyPy as it doesn't yet support Python 3.13.
WindowsExecutable::PyPy => "venvlauncher.exe",
WindowsExecutable::PyPyMajor => "venvlauncher.exe",
WindowsExecutable::PyPyMajorMinor => "venvlauncher.exe",
WindowsExecutable::PyPyw => "venvwlauncher.exe",
WindowsExecutable::PyPyMajorMinorw => "venvwlauncher.exe",
WindowsExecutable::GraalPy => "venvlauncher.exe",
}
}
}
/// <https://github.com/python/cpython/blob/d457345bbc6414db0443819290b04a9a4333313d/Lib/venv/__init__.py#L261-L267>
/// <https://github.com/pypa/virtualenv/blob/d9fdf48d69f0d0ca56140cf0381edbb5d6fe09f5/src/virtualenv/create/via_global_ref/builtin/cpython/cpython3.py#L78-L83>
///
/// There's two kinds of applications on windows: Those that allocate a console (python.exe)
/// and those that don't because they use window(s) (pythonw.exe).
fn copy_launcher_windows(
executable: WindowsExecutable,
interpreter: &Interpreter,
base_python: &Path,
scripts: &Path,
python_home: &Path,
) -> Result<(), Error> {
// First priority: the `python.exe` and `pythonw.exe` shims.
let shim = interpreter
.stdlib()
.join("venv")
.join("scripts")
.join("nt")
.join(executable.exe(interpreter));
match fs_err::copy(shim, scripts.join(executable.exe(interpreter))) {
Ok(_) => return Ok(()),
Err(err) if err.kind() == io::ErrorKind::NotFound => {}
Err(err) => {
return Err(err.into());
}
}
// Second priority: the `venvlauncher.exe` and `venvwlauncher.exe` shims.
// These are equivalent to the `python.exe` and `pythonw.exe` shims, which were
// renamed in Python 3.13.
let shim = interpreter
.stdlib()
.join("venv")
.join("scripts")
.join("nt")
.join(executable.launcher());
match fs_err::copy(shim, scripts.join(executable.exe(interpreter))) {
Ok(_) => return Ok(()),
Err(err) if err.kind() == io::ErrorKind::NotFound => {}
Err(err) => {
return Err(err.into());
}
}
// Third priority: on Conda at least, we can look for the launcher shim next to
// the Python executable itself.
let shim = base_python.with_file_name(executable.launcher());
match fs_err::copy(shim, scripts.join(executable.exe(interpreter))) {
Ok(_) => return Ok(()),
Err(err) if err.kind() == io::ErrorKind::NotFound => {}
Err(err) => {
return Err(err.into());
}
}
// Fourth priority: if the launcher shim doesn't exist, assume this is
// an embedded Python. Copy the Python executable itself, along with
// the DLLs, `.pyd` files, and `.zip` files in the same directory.
match fs_err::copy(
base_python.with_file_name(executable.exe(interpreter)),
scripts.join(executable.exe(interpreter)),
) {
Ok(_) => {
// Copy `.dll` and `.pyd` files from the top-level, and from the
// `DLLs` subdirectory (if it exists).
for directory in [
python_home,
interpreter.sys_base_prefix().join("DLLs").as_path(),
] {
let entries = match fs_err::read_dir(directory) {
Ok(read_dir) => read_dir,
Err(err) if err.kind() == io::ErrorKind::NotFound => {
continue;
}
Err(err) => {
return Err(err.into());
}
};
for entry in entries {
let entry = entry?;
let path = entry.path();
if path.extension().is_some_and(|ext| {
ext.eq_ignore_ascii_case("dll") || ext.eq_ignore_ascii_case("pyd")
}) {
if let Some(file_name) = path.file_name() {
fs_err::copy(&path, scripts.join(file_name))?;
}
}
}
}
// Copy `.zip` files from the top-level.
match fs_err::read_dir(python_home) {
Ok(entries) => {
for entry in entries {
let entry = entry?;
let path = entry.path();
if path
.extension()
.is_some_and(|ext| ext.eq_ignore_ascii_case("zip"))
{
if let Some(file_name) = path.file_name() {
fs_err::copy(&path, scripts.join(file_name))?;
}
}
}
}
Err(err) if err.kind() == io::ErrorKind::NotFound => {}
Err(err) => {
return Err(err.into());
}
};
return Ok(());
}
Err(err) if err.kind() == io::ErrorKind::NotFound => {}
Err(err) => {
return Err(err.into());
}
}
Err(Error::NotFound(base_python.user_display().to_string()))
}