community.general/plugins/modules/uv_python.py

#!/usr/bin/python
# Copyright (c) 2026 Mariam Ahhttouche <mariam.ahhttouche@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)


DOCUMENTATION = r'''
---
module: uv_python
short_description: Manage Python versions and installations using uv Python package manager.
description:
  - Install, uninstall or upgrade Python versions managed by C(uv).
version_added: "0.1.7"
requirements:
  - uv must be installed and available in PATH.
  - uv version must be at least 0.8.0.
options:
  version:
    description:
      - Python version to manage.
      - Only L(canonical Python versions, https://peps.python.org/pep-0440/) are supported in this release such as C(3), C(3.12), C(3.12.3), C(3.15.0a5).
      - Advanced uv selectors such as C(>=3.12,<3.13) or C(cpython@3.12) are not supported in this release.
      - When specifying only a major or major.minor version, behavior depends on the O(state) parameter.
    type: str
    required: true
  state:
    description:
      - Desired state of the specified Python version.
      - C(present) ensures the specified version is installed. If a full patch version is specified (for example C(3.12.3)), that exact version will be installed if not already present. If only a minor version is specified (for example 3.12), the latest available patch version for that minor release is installed only if no patch version for that minor release is currently installed (including patch versions not managed by C(uv)). RV(python_versions) and RV(python_paths) lengths are always equal to one for this state. Uses C(uv python install) command.
      - C(absent) ensures the specified version is removed. If a full patch version is specified, only that exact patch version is removed. If only a minor version is specified (for example C(3.12)), all installed patch versions for that minor release are removed. If the specified version is not installed, no changes are made. RV(python_versions) and RV(python_paths) lengths can be higher or equal to one for this state. Uses C(uv python uninstall) command.
      - C(latest) ensures the latest available patch version for the specified version is installed. If only a minor version is specified (for example C(3.12)), the latest available patch version for that minor release is always installed. If another patch version is already installed but is not the latest, the latest patch version is installed. The latest patch version installed depends on the C(uv) version, since available Python versions are frozen per C(uv) release. RV(python_versions) and RV(python_paths) lengths are always equal to one for this state. This state does not use C(uv python upgrade).
    type: str
    choices: [present, absent, latest]
    default: present
attributes:
  check_mode:
      description: Can run in check_mode and return changed status prediction without modifying target.
      support: full
  diff_mode:
      description: Returns details on what has changed (or possibly needs changing in check_mode), when in diff mode.
      support: none
notes:
seealso:
- name: uv documentation
  description: Python versions management with uv.
  link: https://docs.astral.sh/uv/concepts/python-versions/
- name: uv CLI documentation
  description: uv CLI reference guide.
  link: https://docs.astral.sh/uv/reference/cli/#uv-python
author: Mariam Ahhttouche (@mriamah)

'''

EXAMPLES = r'''
- name: Install Python 3.14
  mriamah.uv_python:
    version: "3.14"

- name: Remove Python 3.13.5
  mriamah.uv_python:
    version: 3.13.5
    state: absent

- name: Upgrade python 3
  mriamah.uv_python:
    version: 3
    state: latest
'''

RETURN = r'''
python_versions:
  description: List of Python versions changed.
  returned: success
  type: list
python_paths:
  description: List of installation paths of Python versions changed.
  returned: success
  type: list
stdout:
  description: Stdout of the executed command.
  returned: success
  type: str
stderr:
  description: Stderr of the executed command.
  returned: success
  type: str
rc:
  description: Return code of the executed command.
  returned: success
  type: int
'''

import json
import traceback
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.compat.version import LooseVersion
from ansible.module_utils.basic import missing_required_lib

LIB_IMP_ERR = None
HAS_LIB = False
try:
    from packaging.version import Version, InvalidVersion
    HAS_LIB = True
except:
    LIB_IMP_ERR = traceback.format_exc()


MINIMUM_UV_VERSION = "0.8.0"

class UV:
    """
      Module for managing Python versions and installations using "uv python" command
    """

    def __init__(self, module):
        self.module = module
        self._ensure_min_uv_version()
        python_version = module.params["version"]
        try:
          self.python_version = Version(python_version)
          self.python_version_str = self.python_version.__str__()
        except InvalidVersion:
          self.module.fail_json(
            msg="Unsupported version format. Only canonical Python versions (e.g. 3, 3.12, 3.12.3, 3.15.0a5) are supported in this release."
          )

    def _ensure_min_uv_version(self):
      cmd = [self.module.get_bin_path("uv", required=True), "--version", "--color", "never"]
      _, out, _ = self.module.run_command(cmd, check_rc=True)
      detected = out.strip().split()[-1]
      if LooseVersion(detected) < LooseVersion(MINIMUM_UV_VERSION):
          self.module.fail_json(
              msg=f"uv_python module requires uv >= {MINIMUM_UV_VERSION}",
              detected_version=detected,
              required_version=MINIMUM_UV_VERSION,
          )

    def install_python(self):
      """
        Runs command 'uv python install X.Y.Z' which installs specified python version.
        If patch version is not specified uv installs latest available patch version.
        Returns: 
          tuple [bool, str, str, int, list, list] 
          - boolean to indicate if method changed state
          - command's stdout
          - command's stderr
          - command's return code
          - list of installed versions
          - list of installation paths for each installed version
        Raises:
          AnsibleModuleFailJson:
              If the install command exits with a non-zero return code.
              If specified version is not available for download.
      """
      find_rc, existing_version, _ = self._find_python("--show-version")
      if find_rc == 0:
        _, version_path, _ = self._find_python()
        return False, "", "", 0, [existing_version], [version_path]
      if self.module.check_mode:
        latest_version, _ = self._get_latest_patch_release("--managed-python")
        # when uv does not find any available patch version the install command will fail
        if not latest_version:
          self.module.fail_json(msg=(f"Version {self.python_version_str} is not available."))
        return True, "", "", 0, [latest_version], [""]
      rc, out, err = self._exec(self.python_version_str, "install", check_rc=True)
      latest_version, path = self._get_latest_patch_release("--only-installed", "--managed-python")
      return True, out, err, rc, [latest_version], [path]

    def uninstall_python(self):
      """
        Runs command 'uv python uninstall X.Y.Z' which removes specified python version from environment.
        If patch version is not specified all correspending installed patch versions are removed.
        Returns: 
          tuple [bool, str, str, int, list, list] 
          - boolean to indicate if method changed state
          - command's stdout
          - command's stderr
          - command's return code
          - list of uninstalled versions
          - list of previous installation paths for each uninstalled version
        Raises:
          AnsibleModuleFailJson:
              If the uninstall command exits with a non-zero return code.
      """
      installed_versions, install_paths = self._get_installed_versions("--managed-python")
      if not installed_versions:
        return False, "", "", 0, [], []
      if self.module.check_mode:
        return True, "", "", 0, installed_versions, install_paths
      rc, out, err = self._exec(self.python_version_str, "uninstall", check_rc=True)
      return True, out, err, rc, installed_versions, install_paths

    def upgrade_python(self):
      """
        Runs command 'uv python install X.Y.Z' with latest patch version available.
        Returns: 
          tuple [bool, str, str, int, list, list] 
          - boolean to indicate if method changed state
          - command's stdout
          - command's stderr
          - command's return code
          - list of installed versions
          - list of installation paths for each installed version
        Raises:
          AnsibleModuleFailJson:
              If the install command exits with a non-zero return code.
              If resolved patch version is not available for download.
      """
      rc, installed_version_str, _ = self._find_python("--show-version")
      installed_version = self._parse_version(installed_version_str)
      latest_version_str, _ = self._get_latest_patch_release("--managed-python")
      if not latest_version_str:
         self.module.fail_json(msg=f"Version {self.python_version_str} is not available.")
      if rc == 0 and installed_version >= Version(latest_version_str):
          _, install_path, _ = self._find_python()
          return False, "", "", rc, [installed_version.__str__()], [install_path]
      if self.module.check_mode:
          return True, "", "", 0, [latest_version_str], []
      # it's possible to have latest version already installed but not used as default 
      # so in this case 'uv python install' will set latest version as default
      rc, out, err = self._exec(latest_version_str, "install", check_rc=True)
      latest_version_str, latest_path = self._get_latest_patch_release("--only-installed", "--managed-python")
      return True, out, err, rc, [latest_version_str], [latest_path]

    def _exec(self, python_version, command, *args, check_rc=False):
      """
        Execute a uv python subcommand.
        Args:
          python_version (str): Python version specifier (e.g. "3.12", "3.12.3").
          command (str): uv python subcommand (e.g. "install", "uninstall", "find").
          *args: Additional positional arguments passed to the command.
          check_rc (bool): Whether to fail if the command exits with non-zero return code.
        Returns:
          tuple[int, str, str]:
            A tuple containing (rc, stdout, stderr).
        Raises:
          AnsibleModuleFailJson:
              If check_rc is True and the command exits with a non-zero return code.
      """
      cmd = [self.module.get_bin_path("uv", required=True), "python", command, python_version, "--color", "never", *args]
      rc, out, err = self.module.run_command(cmd, check_rc=check_rc)
      return rc, out, err

    def _find_python(self, *args, check_rc=False):
      """
        Runs command 'uv python find' which returns path of installed patch releases for a given python version.
        If multiple patch versions are installed, "uv python find" returns the one used by default 
        if inside a virtualenv otherwise it returns latest installed patch version.
        Args:
          *args: Additional positional arguments passed to _exec.
          check_rc (bool): Whether to fail if the command exits with non-zero return code.
        Returns:
          tuple[int, str, str]:
            A tuple containing (rc, stdout, stderr).
        Raises:
          AnsibleModuleFailJson:
            If check_rc is True and the command exits with a non-zero return code.
      """
      rc, out, err = self._exec(self.python_version_str, "find", *args, check_rc=check_rc)
      if rc == 0:
        out = out.strip()
      return rc, out, err

    def _list_python(self, *args, check_rc=False):
      """
        Runs command 'uv python list' (which returns list of installed patch releases for a given python version).
        Official documentation https://docs.astral.sh/uv/reference/cli/#uv-python-list
        Args:
          *args: Additional positional arguments passed to _exec.
          check_rc (bool): Whether to fail if the command exits with non-zero return code.
        Returns:
          tuple[int, str, str]:
            A tuple containing (rc, stdout, stderr).
        Raises:
          AnsibleModuleFailJson:
            If check_rc is True and the command exits with a non-zero return code.
      """
      rc, out, err = self._exec(self.python_version_str, "list", "--output-format", "json", *args, check_rc=check_rc)
      try:
        out = json.loads(out)
      except json.decoder.JSONDecodeError:
        # This happens when no version is found
        pass
      return rc, out, err

    def _get_latest_patch_release(self, *args):
      """
        Returns latest available patch release for a given python version.
        Args:
          *args: Additional positional arguments passed to _list_python.
        Returns:
          tuple[str, str]:
            - latest found patch version in format X.Y.Z
            - installation path of latest patch version if version exists
      """
      latest_version = path = ""
      _, results, _ = self._list_python(*args) # uv returns versions in descending order but we sort them just in case future uv behavior changes
      valid_results = self._parse_versions(results)
      if valid_results:
        version = max(valid_results, key=lambda result: result["parsed_version"])
        latest_version = version.get("version", "")
        path = version.get("path", "")
      return latest_version, path

    def _get_installed_versions(self, *args):
      """
        Returns installed patch releases for a given python version.
        Args:
          *args: Additional positional arguments passed to _list_python.
        Returns:
          tuple[list, list]:
            - list of latest found patch versions
            - list of installation paths of installed versions
      """
      _, results, _ = self._list_python("--only-installed", *args)
      if results:
        return [result["version"] for result in results], [result["path"] for result in results]
      return [], []

    @staticmethod
    def _parse_versions(results):
      valid_results =[]
      for result in results:
        try:
          result["parsed_version"] = Version(result.get("version", ""))
          valid_results.append(result)
        except InvalidVersion:
            continue
      return valid_results

    @staticmethod
    def _parse_version(version_str):
      try:
          return Version(version_str)
      except InvalidVersion:
          return Version("0")


def main():
    module = AnsibleModule(
        argument_spec=dict(
            version=dict(type='str', required=True),
            state=dict(type='str', default='present', choices=['present', 'absent', 'latest']),
        ),
        supports_check_mode=True
    )

    if not HAS_LIB:
      module.fail_json(msg=missing_required_lib("packaging"),
                     exception=LIB_IMP_ERR)
    
    result = dict(
        changed=False,
        stdout="",
        stderr="",
        rc=0,
        python_versions=[],
        python_paths=[],
        failed=False
    )
    state = module.params["state"]

    uv = UV(module)
    if state == "present":
      result["changed"], result["stdout"], result["stderr"], result["rc"], result["python_versions"], result["python_paths"] = uv.install_python()
    elif state == "absent":
      result["changed"], result["stdout"], result["stderr"], result["rc"], result["python_versions"], result["python_paths"] = uv.uninstall_python()
    elif state == "latest":
      result["changed"], result["stdout"], result["stderr"], result["rc"], result["python_versions"], result["python_paths"] = uv.upgrade_python()

    module.exit_json(**result)


if __name__ == "__main__":
    main()