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fix(waybar): SIGUSR2 reload to avoid surface-recreate ghost on theme switch

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Theme-switching ran systemctl --user restart waybar.service, which tears
down waybar's wayland layer-shell surface and creates a new one
back-to-back. Hyprland needs a frame to clear the destroyed surface; the
new instance attaches its surface immediately, so for a frame or two the
old waybar pixels remain visible behind/under the new bar - the
"artifacts and old colors on top of new" symptom most visible on the
fresh compositor of the live ISO.

Switch to SIGUSR2 reload, which makes waybar re-read config.jsonc and
CSS (including @import-ed files like ~/.config/nomarchy/current/theme/
waybar.css that theme-switch rewrites) without destroying the surface.
Full systemctl start is kept for the cold-start case.

Drive-by: replace the `systemctl list-unit-files` presence check with
`systemctl cat` - list-unit-files returns 0 even on no-match, so the
old check would always pick the systemctl branch and never fall through
to the pkill fallback on systems where waybar isn't a systemd unit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Bernardo Magri
2026-04-30 19:24:25 +01:00
parent d06ef86bb9
commit 386da51178
1 changed files with 16 additions and 7 deletions
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23
features/scripts/utils/nomarchy-restart-waybar
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@@ -1,13 +1,22 @@
#!/bin/bash #!/bin/bash
# Waybar is provided as a Home Manager user service # Reload waybar in place when it's already running. SIGUSR2 makes waybar
# (programs.waybar.systemd.enable = true), so the right way to restart it is # re-read its config.jsonc and CSS (including @import-ed files like
# via systemd. `pkill + uwsm-app` races with HM's sd-switch on theme changes # ~/.config/nomarchy/current/theme/waybar.css that theme-switch rewrites)
# and sometimes lands the new waybar without a full environment, producing # without destroying its layer-shell surface. A full systemctl restart
# the "wrong colors after theme switch" symptom. # tears the surface down and creates a new one back-to-back, leaving a
# frame or two where Hyprland hasn't cleared the dead surface yet — that's
# the "old on top of new with artifacts" you see after a theme switch on
# the live ISO.
if pgrep -x waybar >/dev/null; then
exec pkill -SIGUSR2 -x waybar
fi
if systemctl --user list-unit-files waybar.service >/dev/null 2>&1; then # Not running yet — start it. Prefer the HM systemd user unit
exec systemctl --user restart waybar.service # (programs.waybar.systemd.enable = true). `systemctl cat` returns
# non-zero when the unit doesn't exist; `list-unit-files` does not.
if systemctl --user cat waybar.service >/dev/null 2>&1; then
exec systemctl --user start waybar.service
fi fi
# Fallback for systems where waybar isn't managed by systemd. # Fallback for systems where waybar isn't managed by systemd.