template: add additional variable for dest path (#52015)

Signed-off-by: Dustin Spicuzza <dustin@virtualroadside.com>
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/files/template.py

@@ -22,13 +22,14 @@ description:
 - Templates are processed by the L(Jinja2 templating language,http://jinja.pocoo.org/docs/).
 - Documentation on the template formatting can be found in the
   L(Template Designer Documentation,http://jinja.pocoo.org/docs/templates/).
-- The six additional variables, listed below, can be used in template.
+- Additional variables listed below can be used in templates.
 - C(ansible_managed) (configurable via the C(defaults) section of C(ansible.cfg)) contains a string which can be used to
   describe the template name, host, modification time of the template file and the owner uid.
 - C(template_host) contains the node name of the template's machine.
 - C(template_uid) is the numeric user id of the owner.
 - C(template_path) is the path of the template.
 - C(template_fullpath) is the absolute path of the template.
+- C(template_destpath) is the path of the template on the remote system (added in 2.8).
 - C(template_run_date) is the date that the template was rendered.
 options:
   src:

lib/ansible/modules/windows/win_template.py

@@ -19,15 +19,17 @@ description:
        (U(http://jinja.pocoo.org/docs/)) - documentation on the template
        formatting can be found in the Template Designer Documentation
        (U(http://jinja.pocoo.org/docs/templates/)).
-     - "Six additional variables can be used in templates: C(ansible_managed)
+     - "Additional variables can be used in templates: C(ansible_managed)
        (configurable via the C(defaults) section of C(ansible.cfg)) contains a string
        which can be used to describe the template name, host, modification time of the
-       template file and the owner uid, C(template_host) contains the node name of
-       the template's machine, C(template_uid) the owner, C(template_path) the
-       absolute path of the template, C(template_fullpath) is the absolute path of the
-       template, and C(template_run_date) is the date that the template was rendered. Note that including
-       a string that uses a date in the template will result in the template being marked 'changed'
-       each time."
+       template file and the owner uid."
+     - "C(template_host) contains the node name of the template's machine."
+     - "C(template_uid) the owner."
+     - "C(template_path) the absolute path of the template."
+     - "C(template_fullpath) is the absolute path of the template."
+     - "C(template_destpath) is the path of the template on the remote system (added in 2.8)."
+     - "C(template_run_date) is the date that the template was rendered."
+     - "Note that including a string that uses a date in the template will result in the template being marked 'changed' each time."
      - For other platforms you can use M(template) which uses '\n' as C(newline_sequence).
 options:
   src:

lib/ansible/plugins/action/template.py

@@ -141,7 +141,7 @@ class ActionModule(ActionBase):
 
                 # add ansible 'template' vars
                 temp_vars = task_vars.copy()
-                temp_vars.update(generate_ansible_template_vars(source))
+                temp_vars.update(generate_ansible_template_vars(source, dest))
 
                 old_vars = self._templar._available_variables
                 self._templar.set_available_variables(temp_vars)

lib/ansible/template/__init__.py

@@ -84,20 +84,22 @@ else:
     from jinja2.utils import concat as j2_concat
 
 
-def generate_ansible_template_vars(path):
+def generate_ansible_template_vars(path, dest_path=None):
     b_path = to_bytes(path)
     try:
         template_uid = pwd.getpwuid(os.stat(b_path).st_uid).pw_name
     except (KeyError, TypeError):
         template_uid = os.stat(b_path).st_uid
 
-    temp_vars = {}
-    temp_vars['template_host'] = to_text(os.uname()[1])
-    temp_vars['template_path'] = path
-    temp_vars['template_mtime'] = datetime.datetime.fromtimestamp(os.path.getmtime(b_path))
-    temp_vars['template_uid'] = to_text(template_uid)
-    temp_vars['template_fullpath'] = os.path.abspath(path)
-    temp_vars['template_run_date'] = datetime.datetime.now()
+    temp_vars = {
+        'template_host': to_text(os.uname()[1]),
+        'template_path': path,
+        'template_mtime': datetime.datetime.fromtimestamp(os.path.getmtime(b_path)),
+        'template_uid': to_text(template_uid),
+        'template_fullpath': os.path.abspath(path),
+        'template_run_date': datetime.datetime.now(),
+        'template_destpath': to_native(dest_path) if dest_path else None,
+    }
 
     managed_default = C.DEFAULT_MANAGED_STR
     managed_str = managed_default.format(

test/integration/targets/template/tasks/main.yml

@@ -667,5 +667,23 @@
       - list_var.1.foo is not defined
       - list_var.1.foo | default('DEFAULT') == 'DEFAULT'
 
+- template:
+    src: template_destpath_test.j2
+    dest: "{{ output_dir }}/template_destpath.templated"
+
+- copy:
+    content: "{{ output_dir}}/template_destpath.templated\n"
+    dest: "{{ output_dir }}/template_destpath.expected"
+
+- name: compare templated file to known good template_destpath
+  shell: diff -uw {{output_dir}}/template_destpath.templated {{output_dir}}/template_destpath.expected
+  register: diff_result
+
+- name: verify templated template_destpath matches known good
+  assert:
+    that:
+        - 'diff_result.stdout == ""'
+        - "diff_result.rc == 0"
+
 # aliases file requires root for template tests so this should be safe
 - include: backup_test.yml

test/integration/targets/template/templates/template_destpath_test.j2

@@ -0,0 +1 @@
+{{ template_destpath }}