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Drive gate: set the realistic newtab prefs so a human-cursor click can't lose the about:newtab race

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FF150+Fission auto-loads about:newtab (TopSitesFeed) ~100ms-1s after a tab's
first navigation — a cross-process BC swap that replaces the page. The wrapper
always disables this (prefs.py); the raw-Playwright drive gate did not, so any
action that adds latency (e.g. the human-cursor motion path) let the page vanish
mid-sequence and surfaced as a phantom "waiting for locator" timeout — an
environment artifact, not a binary defect. The gate now launches with the same
newtab-suppression prefs every real run uses.

Add republish.yml: re-gate + publish an existing build run's artifacts without
rebuilding, for when all builds succeeded but a gate/test bug blocked publish.
This commit is contained in:
feder-cr 2026-06-16 23:40:29 +02:00
parent 29262a644e
commit 30a79cefc9
2 changed files with 233 additions and 1 deletions
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20
scripts/ci_drive_gate.py
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@ -87,12 +87,30 @@ def _start_server():
return srv, srv.server_address[1]
# FF150 + Fission auto-loads about:newtab (TopSitesFeed) ~100ms-1s after a tab's
# first navigation — a cross-process BC swap that REPLACES the page out from under
# the test. The wrapper always disables it (see prefs.py); raw Playwright does not,
# so the binary's realistic config must set it here too. Without this the drive page
# can vanish mid-sequence (it loses the race whenever an action adds latency, e.g.
# the human-cursor path), surfacing as a phantom "waiting for locator" timeout that
# is an environment artifact, not a binary defect.
_REALISTIC_PREFS = {
"browser.startup.page": 0,
"browser.newtabpage.enabled": False,
"browser.newtab.preload": False,
"browser.newtabpage.activity-stream.feeds.topsites": False,
"browser.newtabpage.activity-stream.feeds.section.topstories": False,
"browser.newtabpage.activity-stream.enabled": False,
}
def _drive(exe: str, url: str, full: bool) -> str:
"""One full drive attempt. Returns the UA on success; raises on failure."""
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.firefox.launch(executable_path=exe, headless=True)
browser = p.firefox.launch(executable_path=exe, headless=True,
firefox_user_prefs=_REALISTIC_PREFS)
try:
page = browser.new_page()
resp = page.goto(url, wait_until="load")