1798063 - Pref set using `mach mochitest --setpref` is no longer reflected in value returned from SpecialPowers.getCharPref()

Status: RESOLVED FIXED

(Core :: Preferences: Backend, defect)

Description

[Botond Ballo [:botond]]

STR

In a local build, run ./mach mochitest --setpref apz.subtest=helper_scrollby_bug1531796.html gfx/layers/apz/test/mochitest/test_group_mainthread.html

Expected results

The SpecialPowers.getCharPref("apz.subtest", "") call here returns "helper_scrollby_bug1531796.html" (which then has the effect that only this subtest is run).

Actual results

The call returns an empty string (which then has the effect that all subtests are run).

This is a recent regression, but since the STR require a mach environment I'm not sure how to get a regression range.

Comment 1

[Botond Ballo [:botond]]

The regressing bug here is bug 1782444. There appears to be a new "sanitization" mechanism which is preventing the value of the pref from being propagated from the parent process to the content process, which is where it's read.

Comment 2

[Botond Ballo [:botond]]

Tom, is the appropriate fix here to add apz.subtest to this allowlist?

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1782444

Comment 4

[Tom Ritter [:tjr] (OOTO until 7/21)]

Yes, that's correct!

Comment 5

[Botond Ballo [:botond]]

Attachment: Bug 1798063 - Allowlist the apz.subtest pref. r=tjr

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/2d51df2b0344
Allowlist the apz.subtest pref. r=tjr

Comment 7

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/2d51df2b0344