Allow prefs to be overridden from a file and set WPT-specific prefs from file (#33163)

* Allow prefs to be passed in from a separate file

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Add wpt-prefs.json for setting WPT-specific prefs

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* fix argument to read_prefs_file

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Update test_parse_pref test

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Add line in executorservo.py to read from wpt-prefs.json

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Update MANIFEST.json

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Update expectations

Signed-off-by: Daniel Adams <msub2official@gmail.com>

* Disable dom.webxr.test for interfaces test

Signed-off-by: Daniel Adams <msub2official@gmail.com>

---------

Signed-off-by: Daniel Adams <msub2official@gmail.com>

ports/servoshell/desktop/cli.rs

@@ -45,6 +45,12 @@ pub fn main() {
         "A preference to set to disable",
         "dom.webgpu.enabled=false",
     );
+    opts.optmulti(
+        "",
+        "prefs-file",
+        "Load in additional prefs from a file.",
+        "--prefs-file /path/to/prefs.json",
+    );
 
     let opts_matches;
     let content_process_token;

ports/servoshell/prefs.rs

@@ -22,15 +22,17 @@ pub fn register_user_prefs(opts_matches: &Matches) {
         .filter(|path| path.exists());
 
     let mut userprefs = if let Some(path) = user_prefs_path {
-        let mut file = File::open(path).expect("Error opening user prefs");
-        let mut txt = String::new();
-        file.read_to_string(&mut txt)
-            .expect("Can't read user prefs file");
-        prefs::read_prefs_map(&txt).expect("Can't parse user prefs file")
+        read_prefs_file(path.to_str().expect("Failed to read user prefs"))
     } else {
         HashMap::new()
     };
 
+    let prefs_from_files: Vec<HashMap<String, PrefValue>> = opts_matches
+        .opt_strs("prefs-file")
+        .iter()
+        .map(|path| read_prefs_file(path))
+        .collect();
+
     let argprefs: HashMap<String, PrefValue> = opts_matches
         .opt_strs("pref")
         .iter()
@@ -54,16 +56,30 @@ pub fn register_user_prefs(opts_matches: &Matches) {
         })
         .collect();
 
-    // --pref overrides user prefs.json
+    // Apply --prefs-file prefs first
+    for prefs in prefs_from_files {
+        userprefs.extend(prefs);
+    }
+
+    // Then apply individually passed prefs from --pref
     userprefs.extend(argprefs);
 
     prefs::add_user_prefs(userprefs);
 }
 
+fn read_prefs_file(path: &str) -> HashMap<String, PrefValue> {
+    let mut file = File::open(path).expect("Error opening user prefs");
+    let mut txt = String::new();
+    file.read_to_string(&mut txt)
+        .expect("Can't read user prefs file");
+    prefs::read_prefs_map(&txt).expect("Can't parse user prefs file")
+}
+
 #[cfg(test)]
 fn test_parse_pref(arg: &str) {
     let mut opts = getopts::Options::new();
     opts.optmulti("", "pref", "", "");
+    opts.optmulti("", "prefs-file", "", "");
     let args = vec!["servo".to_string(), "--pref".to_string(), arg.to_string()];
     let matches = match opts::from_cmdline_args(opts, &args) {
         opts::ArgumentParsingResult::ContentProcess(m, _) => m,

resources/wpt-prefs.json

@@ -0,0 +1,3 @@
+{
+  "dom.webxr.test": true
+}

tests/wpt/meta/MANIFEST.json

@@ -489596,7 +489596,7 @@
         []
        ],
        "executorservo.py": [
-        "9c938b6e75e27c61167294a941629928fa33db73",
+        "c23f7632c9ef5f0acbdbb569db41f741ccf9de89",
         []
        ],
        "executorservodriver.py": [

tests/wpt/mozilla/meta-legacy-layout/mozilla/interfaces.html.ini

@@ -0,0 +1 @@
+prefs: [dom.webxr.test: false]

tests/wpt/mozilla/meta/mozilla/interfaces.html.ini

@@ -0,0 +1 @@
+prefs: [dom.webxr.test: false]

tests/wpt/mozilla/meta/webxr/create_session.https.html.ini

@@ -1,4 +0,0 @@
-[create_session.https.html]
-  expected: ERROR
-  [create_session]
-    expected: TIMEOUT

tests/wpt/mozilla/meta/webxr/obtain_frame.https.html.ini

@@ -1,3 +0,0 @@
-[obtain_frame.https.html]
-  [obtain_frame]
-    expected: FAIL

tests/wpt/mozilla/meta/webxr/sessionavailable.https.html.ini

@@ -1,4 +1,4 @@
 [sessionavailable.https.html]
-  expected: ERROR
+  expected: TIMEOUT
   [Requesting immersive session in a sessionavailable handler should succeed]
     expected: TIMEOUT

tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservo.py

@@ -78,6 +78,7 @@ class ServoExecutor(ProcessTestExecutor):
             args += ["--user-stylesheet", stylesheet]
         for pref, value in self.environment.get('prefs', {}).items():
             args += ["--pref", f"{pref}={value}"]
+        args += ["--prefs-file", "resources/wpt-prefs.json"]
         if self.browser.ca_certificate_path:
             args += ["--certificate-path", self.browser.ca_certificate_path]
         if extra_args: