scripts: check-html-references: Rename --prefix to --webroot and make it mandatory

Force users to pass the path to the root of the webpage the script
should check. The script lives in a different subdirectory so the
default of the current directory doesn't make much sense.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

docs/meson.build

@@ -359,7 +359,7 @@ test(
   python3_prog,
   args: [
     check_html_references_prog.full_path(),
-    '--prefix',
+    '--webroot',
     meson.project_build_root() / 'docs'
   ],
   env: runutf8,

scripts/check-html-references.py

@@ -127,14 +127,14 @@ def check_targets(targets, anchors):
 
 
 parser = argparse.ArgumentParser(description='HTML reference checker')
-parser.add_argument('--prefix', default='.',
-                    help='build tree prefix')
+parser.add_argument('--webroot', required=True,
+                    help='path to the web root')
 parser.add_argument('--external', action="store_true",
                     help='print external references instead')
 
 args = parser.parse_args()
 
-files = get_file_list(args.prefix)
+files = get_file_list(args.webroot)
 
 targets, anchors = process_all(files)