Bug 1603988 - Part 1: Avoid to fail system-symbols-mac-upload-symbols when no symbols to upload r=marco,gsvelto

Currently, when task system-symbols-mac doesn't produce artifacts because of no data, then the task system-symbols-mac-upload-symbols is failing too.
So this patch aims to not fail the task in such a case.

Differential Revision: https://phabricator.services.mozilla.com/D59848

--HG--
extra : moz-landing-system : lando

taskcluster/ci/system-symbols-upload/kind.yml

@@ -23,7 +23,7 @@ job-template:
             SYMBOL_SECRET: "project/releng/gecko/build/level-{level}/gecko-symbol-upload"
     run:
         using: mach
-        mach: {artifact-reference: "python toolkit/crashreporter/tools/upload_symbols.py <build/public/build/target.crashreporter-symbols.zip>"}
+        mach: {artifact-reference: "python toolkit/crashreporter/tools/upload_symbols.py <build/public/build/target.crashreporter-symbols.zip> --ignore-missing"}
         sparse-profile: upload-symbols
     scopes:
         - secrets:get:project/releng/gecko/build/level-{level}/gecko-symbol-upload

toolkit/crashreporter/tools/upload_symbols.py

@@ -68,9 +68,31 @@ def main():
         description='Upload symbols in ZIP using token from Taskcluster secrets service.')
     parser.add_argument('zip',
                         help='Symbols zip file - URL or path to local file')
+    parser.add_argument('--ignore-missing',
+                        help='No error on missing files',
+                        action='store_true')
     args = parser.parse_args()
 
-    if not args.zip.startswith('http') and not os.path.isfile(args.zip):
+    def check_file_exists(url):
+        for i, _ in enumerate(redo.retrier(attempts=MAX_RETRIES), start=1):
+            try:
+                resp = requests.head(url, allow_redirects=True)
+                return resp.status_code == requests.codes.ok
+            except requests.exceptions.RequestException as e:
+                log.error('Error: {0}'.format(e))
+            log.info('Retrying...')
+        return False
+
+    if args.zip.startswith('http'):
+        is_existing = check_file_exists(args.zip)
+    else:
+        is_existing = os.path.isfile(args.zip)
+
+    if not is_existing:
+        if args.ignore_missing:
+            log.info('Zip file "{0}" does not exist!'.format(args.zip))
+            return 0
+        else:
             log.error('Error: zip file "{0}" does not exist!'.format(args.zip))
             return 1