dnf5,apt: add auto_install_module_deps option (#84292)

* dnf5,apt: add auto_install_module_deps option

Fixes #84206

changelogs/fragments/84206-dnf5-apt-auto-install-module-deps.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - dnf5, apt - add ``auto_install_module_deps`` option (https://github.com/ansible/ansible/issues/84206)

lib/ansible/modules/apt.py

@@ -17,6 +17,12 @@ description:
   - Manages I(apt) packages (such as for Debian/Ubuntu).
 version_added: "0.0.2"
 options:
+  auto_install_module_deps:
+    description:
+      - Automatically install dependencies required to run this module.
+    type: bool
+    default: yes
+    version_added: 2.19
   name:
     description:
       - A list of package names, like V(foo), or package specifier with version, like V(foo=1.0) or V(foo>=1.0).
@@ -191,8 +197,7 @@ options:
     default: 60
     version_added: "2.12"
 requirements:
-   - python-apt (python 2)
-   - python3-apt (python 3)
+   - python3-apt
    - aptitude (before 2.4)
 author: "Matthew Williams (@mgwilliams)"
 extends_documentation_fragment: action_common_attributes
@@ -214,8 +219,8 @@ notes:
    - When used with a C(loop:) each package will be processed individually, it is much more efficient to pass the list directly to the O(name) option.
    - When O(default_release) is used, an implicit priority of 990 is used. This is the same behavior as C(apt-get -t).
    - When an exact version is specified, an implicit priority of 1001 is used.
-   - If the interpreter can't import C(python-apt)/C(python3-apt) the module will check for it in system-owned interpreters as well.
-     If the dependency can't be found, the module will attempt to install it.
+   - If the interpreter can't import C(python3-apt) the module will check for it in system-owned interpreters as well.
+     If the dependency can't be found, depending on the value of O(auto_install_module_deps) the module will attempt to install it.
      If the dependency is found or installed, the module will be respawned under the correct interpreter.
 """
 
@@ -1233,6 +1238,7 @@ def main():
             allow_downgrade=dict(type='bool', default=False, aliases=['allow-downgrade', 'allow_downgrades', 'allow-downgrades']),
             allow_change_held_packages=dict(type='bool', default=False),
             lock_timeout=dict(type='int', default=60),
+            auto_install_module_deps=dict(type='bool', default=True),
         ),
         mutually_exclusive=[['deb', 'package', 'upgrade']],
         required_one_of=[['autoremove', 'deb', 'package', 'update_cache', 'upgrade']],
@@ -1268,7 +1274,7 @@ def main():
     if not HAS_PYTHON_APT:
         # This interpreter can't see the apt Python library- we'll do the following to try and fix that:
         # 1) look in common locations for system-owned interpreters that can see it; if we find one, respawn under it
-        # 2) finding none, try to install a matching python-apt package for the current interpreter version;
+        # 2) finding none, try to install a matching python3-apt package for the current interpreter version;
         #    we limit to the current interpreter version to try and avoid installing a whole other Python just
         #    for apt support
         # 3) if we installed a support package, try to respawn under what we think is the right interpreter (could be
@@ -1294,9 +1300,12 @@ def main():
 
         # don't make changes if we're in check_mode
         if module.check_mode:
-            module.fail_json(msg="%s must be installed to use check mode. "
-                                 "If run normally this module can auto-install it." % apt_pkg_name)
-
+            module.fail_json(
+                msg=f"{apt_pkg_name} must be installed to use check mode. "
+                    "If run normally this module can auto-install it, "
+                    "see the auto_install_module_deps option.",
+            )
+        elif p['auto_install_module_deps']:
             # We skip cache update in auto install the dependency if the
             # user explicitly declared it with update_cache=no.
             if module.params.get('update_cache') is False:
@@ -1324,9 +1333,14 @@ def main():
                 # NB: respawn is somewhat wasteful if it's this interpreter, but simplifies the code
                 respawn_module(interpreter)
                 # this is the end of the line for this process, it will exit here once the respawned module has completed
-        else:
+
         # we've done all we can do; just tell the user it's busted and get out
-            module.fail_json(msg="{0} must be installed and visible from {1}.".format(apt_pkg_name, sys.executable))
+        py_version = sys.version.replace("\n", "")
+        module.fail_json(
+            msg=f"Could not import the {apt_pkg_name} module using {sys.executable} ({py_version}). "
+            f"Ensure {apt_pkg_name} package is installed (either manually or via the auto_install_module_deps option) "
+            f"or that you have specified the correct ansible_python_interpreter. (attempted {interpreters}).",
+        )
 
     if p['clean'] is True:
         aptclean_stdout, aptclean_stderr, aptclean_diff = aptclean(module)

lib/ansible/modules/dnf5.py

@@ -14,6 +14,12 @@ description:
     provides are implemented in M(ansible.builtin.dnf5), please consult specific options for more information."
 short_description: Manages packages with the I(dnf5) package manager
 options:
+  auto_install_module_deps:
+    description:
+      - Automatically install dependencies required to run this module.
+    type: bool
+    default: yes
+    version_added: 2.19
   name:
     description:
       - "A package name or package specifier with version, like C(name-1.0).
@@ -246,6 +252,10 @@ attributes:
         platforms: rhel
 requirements:
   - "python3-libdnf5"
+notes:
+  - If the interpreter can't import C(python3-libdnf5) the module will check for it in system-owned interpreters as well.
+    If the dependency can't be found, depending on the value of O(auto_install_module_deps) the module will attempt to install it.
+    If the dependency is found or installed, the module will be respawned under the correct interpreter.
 version_added: 2.15
 """
 
@@ -460,6 +470,8 @@ def get_unneeded_pkgs(base):
 class Dnf5Module(YumDnf):
     def __init__(self, module):
         super(Dnf5Module, self).__init__(module)
+        self.auto_install_module_deps = self.module.params["auto_install_module_deps"]
+
         self._ensure_dnf()
 
         self.pkg_mgr_name = "dnf5"
@@ -509,21 +521,30 @@ class Dnf5Module(YumDnf):
         ]
 
         if not has_respawned():
-            # probe well-known system Python locations for accessible bindings, favoring py3
+            for attempt in (1, 2):
+                # probe well-known system Python locations for accessible bindings
                 interpreter = probe_interpreters_for_module(system_interpreters, "libdnf5")
-
                 if interpreter:
                     # respawn under the interpreter where the bindings should be found
                     respawn_module(interpreter)
                     # end of the line for this module, the process will exit here once the respawned module completes
+                if attempt == 1:
+                    if self.module.check_mode:
+                        self.module.fail_json(
+                            msg="python3-libdnf5 must be installed to use check mode. "
+                                "If run normally this module can auto-install it, "
+                                "see the auto_install_module_deps option.",
+                        )
+                    elif self.auto_install_module_deps:
+                        self.module.run_command(["dnf", "install", "-y", "python3-libdnf5"], check_rc=True)
+                    else:
+                        break
 
-        # done all we can do, something is just broken (auto-install isn't useful anymore with respawn, so it was removed)
+        py_version = sys.version.replace("\n", "")
         self.module.fail_json(
-            msg="Could not import the libdnf5 python module using {0} ({1}). "
-            "Please install python3-libdnf5 package or ensure you have specified the "
-            "correct ansible_python_interpreter. (attempted {2})".format(
-                sys.executable, sys.version.replace("\n", ""), system_interpreters
-            ),
+            msg=f"Could not import the libdnf5 python module using {sys.executable} ({py_version}). "
+            "Ensure python3-libdnf5 package is installed (either manually or via the auto_install_module_deps option) "
+            f"or that you have specified the correct ansible_python_interpreter. (attempted {system_interpreters}).",
             failures=[],
         )
 
@@ -780,6 +801,11 @@ class Dnf5Module(YumDnf):
 
 
 def main():
+    yumdnf_argument_spec["argument_spec"].update(
+        dict(
+            auto_install_module_deps=dict(type="bool", default=True),
+        )
+    )
     Dnf5Module(AnsibleModule(**yumdnf_argument_spec)).run()
 
 

test/integration/targets/apt/tasks/apt.yml

@@ -8,17 +8,17 @@
     distro_mirror: http://archive.ubuntu.com/ubuntu
   when: ansible_distribution == 'Ubuntu'
 
-# UNINSTALL 'python-apt'
-#  The `apt` module has the smarts to auto-install `python-apt(3)`.  To test, we
-#  will first uninstall `python-apt`.
-- name: uninstall python-apt with apt
+# UNINSTALL 'python3-apt'
+#  The `apt` module has the smarts to auto-install `python3-apt`.  To test, we
+#  will first uninstall `python3-apt`.
+- name: uninstall python3-apt with apt
   apt:
-    pkg: [python-apt, python3-apt]
+    pkg: python3-apt
     state: absent
     purge: yes
   register: apt_result
 
-# In check mode, auto-install of `python-apt` must fail
+# In check mode, auto-install of `python3-apt` must fail
 - name: test fail uninstall hello without required apt deps in check mode
   apt:
     pkg: hello
@@ -32,13 +32,25 @@
   assert:
     that:
     - apt_result is failed
-    - '"If run normally this module can auto-install it." in apt_result.msg'
+    - '"If run normally this module can auto-install it" in apt_result.msg'
 
 - name: check with dpkg
-  shell: dpkg -s python-apt python3-apt
+  shell: dpkg -s python3-apt
   register: dpkg_result
   ignore_errors: true
 
+- name: Test the auto_install_module_deps option
+  apt:
+    pkg: hello
+    auto_install_module_deps: false
+  register: r
+  ignore_errors: true
+
+- assert:
+    that:
+      - r is failed
+      - r.msg is contains("Could not import the python3-apt module")
+
 # UNINSTALL 'hello'
 #   With 'python-apt' uninstalled, the first call to 'apt' should install
 #   python-apt without updating the cache.

test/integration/targets/dnf5/playbook.yml

@@ -2,9 +2,26 @@
   tasks:
     - block:
         - command: "dnf install -y 'dnf-command(copr)'"
-        - command: dnf copr enable -y rpmsoftwaremanagement/dnf-nightly
-        - command: dnf install -y -x condor python3-libdnf5
+        - name: Test against dnf5 nightly build to detect any issues early
+          command: dnf copr enable -y rpmsoftwaremanagement/dnf-nightly
 
+        - name: Ensure module deps are not installed
+          command: dnf remove -y python3-libdnf5
+
+        - name: Test the auto_install_module_deps option
+          dnf5:
+            name: sos
+            auto_install_module_deps: false
+          register: r
+          ignore_errors: true
+
+        - assert:
+            that:
+              - r is failed
+              - r.msg is contains("Could not import the libdnf5 python module")
+
+        # Now the first dnf5 task in the dnf role should auto install python3-libdnf5 as
+        # auto_install_module_deps is true by default.
         - include_role:
             name: dnf
           vars: