regenerate-pgo

name	regenerate-pgo
description	Regenerate cmd/trayscale/default.pgo by launching an isolated Trayscale, driving representative UI paths under PPROF, then replacing the profile. Use when updating PGO, collecting a CPU profile for default.pgo, refreshing profile-guided optimization, or when the user runs /regenerate-pgo.

Regenerate PGO

Replace cmd/trayscale/default.pgo with a CPU profile from this checkout's binary.

Read .cursor/skills/verify-trayscale/SKILL.md first. Use control-trayscale only as the launch/drive/cleanup mechanism. Do not follow its verification recipes and do not write proof artifacts.

Run every command from the repo root:

CTRL=.cursor/skills/verify-trayscale/scripts/control-trayscale
PROFILE=$(mktemp /tmp/trayscale-pgo.XXXXXX.pprof)

Keep that $PROFILE path for launch, validation, and the final copy.

Launch

control-trayscale launch copies the process environment into the isolated session. cmd/trayscale writes a CPU profile to PPROF when main returns.

PPROF="$PROFILE" $CTRL launch
$CTRL doctor

Doctor requirements are the same as verify-trayscale. If doctor fails, read the run logs, run cleanup, and stop.

The live tailscaled is shared. Memory GSettings do not isolate Tailscale prefs or Taildrop.

Do not

Follow verify-trayscale forbidden actions (use_exit_node, login, change_control_server, admin_dashboard, the header connect switch, option switches). quit is required at the end and is the exception.

Also never:

• activate peer.sendFile, open a send/receive file chooser, or drop files on a peer page
• click Use as exit node
• advertise or remove routes
• switch profiles
• click About Website, Report an Issue, or about.save-debug-info

Skip a coverage step whose AT-SPI handle is missing. Do not substitute a forbidden action.

Drive

Keep the process up long enough for the 5s poller to run several times.

1. Snapshot the tree to stdout. Section titles are This machine, Exit Nodes, Online, and Offline.
2. If the tree has Not Connected, skip peer pages. Still open About and Preferences.
3. This machine: select the hostname row if the self page is not showing (grouping 'Tailscale IPs'). Click one Tailscale IP copy button if a button is named with an address.
4. If Mullvad Exit Nodes is in the tree, select --role label --name "Mullvad Exit Nodes" --exact. Do not enable an exit node. Do not expand every country.
5. Select up to five Online peer labels and one Offline peer label, if those rows exist.
6. $CTRL action search-peers. If fill on the search entry fails, skip typing.
7. $CTRL action about, then $CTRL wait --role dialog --name About --exact --timeout 10. Do not click links.
8. $CTRL action preferences, then wait for dialog 'Preferences'. Do not toggle rows.
9. sleep 15 so the poller samples the open UI.

Tray code is unreachable on the isolated bus. Leave it uncovered.

Stop and install

The profile is complete only after pprof.StopCPUProfile runs, which happens when main returns. cleanup sends SIGTERM and skips that defer.

$CTRL action quit --i-mean-it

Wait until doctor no longer reports a live window or bus_name_owned. If the process is still up after about 10s, send SIGINT to the isolated trayscale PID (the binary under the verify run dir). Do not signal by binary name.

Then:

$CTRL cleanup
go tool pprof -top -nodecount=20 "$PROFILE"
cp "$PROFILE" cmd/trayscale/default.pgo
rm -f "$PROFILE"
go test -vet=all ./...

go tool pprof must print sampled functions. If it errors, the profile is truncated; leave cmd/trayscale/default.pgo unchanged.

Replace cmd/trayscale/default.pgo. Do not merge with go tool pprof -proto. Do not leave $PROFILE in the repo.

Report which coverage steps ran, which were skipped and why, and that go test -vet=all ./... passed.