Yum: Add support for --downloadonly (ansible#41506)

lib/ansible/modules/packaging/os/yum.py

@@ -155,6 +155,13 @@
     required: false
     choices: [ all, main, repoid ]
     version_added: "2.7"
+  download_only:
+    description:
+      - Only download the packages, do not install them.
+    required: false
+    default: "no"
+    type: bool
+    version_added: "2.7"
 notes:
   - When used with a `loop:` each package will be processed individually,
     it is much more efficient to pass the list directly to the `name` option.
@@ -269,6 +276,13 @@
       - postgresql
       - postgresql-server
     state: present
+
+- name: Download the nginx package but do not install it
+  yum:
+    name:
+      - nginx
+    state: latest
+    download_only: true
 '''
 
 import os
@@ -1306,7 +1320,7 @@ def latest(module, items, repoq, yum_basecmd, conf_file, en_repos, dis_repos, en
 def ensure(module, state, pkgs, conf_file, enablerepo, disablerepo,
            disable_gpg_check, exclude, repoq, skip_broken, update_only, security,
            bugfix, installroot='/', allow_downgrade=False, disable_plugin=None,
-           enable_plugin=None, disable_excludes=None):
+           enable_plugin=None, disable_excludes=None, download_only=False):
 
     # fedora will redirect yum to dnf, which has incompatibilities
     # with how this module expects yum to operate. If yum-deprecated
@@ -1352,6 +1366,9 @@ def ensure(module, state, pkgs, conf_file, enablerepo, disablerepo,
     if disable_excludes:
         yum_basecmd.extend(['--disableexcludes=%s' % disable_excludes])
 
+    if download_only:
+        yum_basecmd.extend(['--downloadonly'])
+
     if installroot != '/':
         # do not setup installroot by default, because of error
         # CRITICAL:yum.cli:Config Error: Error accessing file for config file:////etc/yum.conf
@@ -1467,6 +1484,7 @@ def main():
             enable_plugin=dict(type='list', default=[]),
             disable_plugin=dict(type='list', default=[]),
             disable_excludes=dict(type='str', default=None, choices=['all', 'main', 'repoid']),
+            download_only=dict(type='bool', default=False),
         ),
         required_one_of=[['name', 'list']],
         mutually_exclusive=[['name', 'list']],
@@ -1528,10 +1546,12 @@ def main():
         security = params['security']
         bugfix = params['bugfix']
         allow_downgrade = params['allow_downgrade']
+        download_only = params['download_only']
         results = ensure(module, state, pkg, params['conf_file'], enablerepo,
                          disablerepo, disable_gpg_check, exclude, repoquery,
                          skip_broken, update_only, security, bugfix, params['installroot'], allow_downgrade,
-                         disable_plugin=disable_plugin, enable_plugin=enable_plugin, disable_excludes=params['disable_excludes'])
+                         disable_plugin=disable_plugin, enable_plugin=enable_plugin,
+                         disable_excludes=params['disable_excludes'], download_only=download_only)
         if repoquery:
             results['msg'] = '%s %s' % (
                 results.get('msg', ''),

test/integration/targets/yum/tasks/yum.yml

@@ -260,6 +260,32 @@
     state: removed
   register: yum_result
 
+# Test download_only
+- name: install sos
+  yum:
+    name: sos
+    state: latest
+    download_only: true
+  register: yum_result
+
+- name: verify download of sos (part 1 -- yum "install" succeeded)
+  assert:
+    that:
+        - "yum_result is success"
+        - "yum_result is changed"
+
+- name: uninstall sos (noop)
+  yum:
+    name: sos
+    state: removed
+  register: yum_result
+
+- name: verify download of sos (part 2 -- nothing removed during uninstall)
+  assert:
+    that:
+        - "yum_result is success"
+        - "not yum_result is changed"
+
 - name: install group
   yum:
     name: "@Development Tools"