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Wiring:
arch-audit.timer (daily, RandomizedDelaySec=1h, Persistent=true)
→ arch-audit.service (After=network-online.target)
→ /run/arch-audit.txt ('--upgradable' output, atomic via .tmp+mv)
→ custom/arch-audit waybar module (interval 300s)
→ mako 'critical' once/24h while count > 0
→ on-click: `ghostty -e nvim -R /run/arch-audit.txt`
The bar entry stays hidden when there are no fixable CVEs, fades in as
red 'CVE N' the moment arch-audit finds at least one, and the throttled
mako means you'll see exactly one notification per day instead of one
per waybar poll. No -Sy refresh and no auto-update — this only reports
the gap between what's installed and what's already in the repos.
Why /run and not the user's runtime dir: the producer is a system unit
(needs the system's pacman db on the network-online path), the consumer
is a user-scope waybar that just reads it; /run is the canonical 'fast,
volatile, world-readable' system-tmpfs and survives the reboot cycle in
exactly the way we want — fresh empty file on every boot, repopulated
on the next timer fire.
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Template service+timer that runs `btrfs balance start -dusage=50
-musage=50 %f` once a month on the instance's mount path. Mirrors the
shape of the stock btrfs-scrub@.{service,timer} so the operational
model is identical: enable btrfs-balance@-.timer for /, btrfs-balance@\
x2dhome.timer for /home, etc.
Why a partial balance and not a full one: full `btrfs balance start`
rewrites every block group, which on a multi-TB volume takes hours and
can chew through enormous amounts of CSUM/free-space-tree work.
`-dusage=50 -musage=50` only consolidates block groups that are less
than half full, which is exactly the operation that reclaims space
'lost' to fragmentation after lots of small writes — the only practical
reason a healthy single-disk btrfs needs balancing at all.
`Nice=19 IOSchedulingClass=idle` keeps it out of the way of foreground
work; `KillSignal=SIGINT` (same as btrfs-scrub) lets a graceful Ctrl-C
checkpoint the operation cleanly. Persistent=true catches the run on
next boot if the machine was off when the timer fired.
Enabled in systemd-units/system.txt as btrfs-balance@-.timer (root
volume only — /home isn't a separate subvolume on this machine).
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sommerfeld