[get_url] skip checksum during --check (#66700)

Fix get_url failure in check mode (--check) when using the checksum
format <algorithm>:<url>.

Regression introduced in (#20532)

Fixes: #61369

changelogs/fragments/61369_get_url.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- get_url - skip checksum during ``--check`` (https://github.com/ansible/ansible/issues/61369).

lib/ansible/modules/get_url.py

@@ -358,16 +358,12 @@ def url_filename(url):
     return fn
 
 
-def url_get(module, url, dest, use_proxy, last_mod_time, force, timeout=10, headers=None, tmp_dest=''):
+def url_get(module, url, dest, use_proxy, last_mod_time, force, timeout=10, headers=None, tmp_dest='', method='GET'):
     """
     Download data from the url and store in a temporary file.
 
     Return (tempfile, info about the request)
     """
-    if module.check_mode:
-        method = 'HEAD'
-    else:
-        method = 'GET'
 
     start = datetime.datetime.utcnow()
     rsp, info = fetch_url(module, url, use_proxy=use_proxy, force=force, last_mod_time=last_mod_time, timeout=timeout, headers=headers, method=method)
@@ -573,7 +569,8 @@ def main():
 
     # download to tmpsrc
     start = datetime.datetime.utcnow()
-    tmpsrc, info = url_get(module, url, dest, use_proxy, last_mod_time, force, timeout, headers, tmp_dest)
+    method = 'HEAD' if module.check_mode else 'GET'
+    tmpsrc, info = url_get(module, url, dest, use_proxy, last_mod_time, force, timeout, headers, tmp_dest, method)
     result['elapsed'] = (datetime.datetime.utcnow() - start).seconds
     result['src'] = tmpsrc
 

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

@@ -382,6 +382,14 @@
     port: '{{ http_port }}'
     state: started
 
+- name: download src with sha1 checksum url in check mode
+  get_url:
+    url: 'http://localhost:{{ http_port }}/27617.txt'
+    dest: '{{ remote_tmp_dir }}'
+    checksum: 'sha1:http://localhost:{{ http_port }}/sha1sum.txt'
+  register: result_sha1_check_mode
+  check_mode: True
+
 - name: download src with sha1 checksum url
   get_url:
     url: 'http://localhost:{{ http_port }}/27617.txt'
@@ -473,6 +481,7 @@
 - name: Assert that the file was downloaded
   assert:
     that:
+      - result_sha1_check_mode is changed
       - result_sha1 is changed
       - result_sha256 is changed
       - result_sha256_with_dot is changed