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feat(install): system-wide low-disk login warning via /etc/profile.d

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Add etc/profile.d/disk-usage-warning.sh (POSIX sh) that warns in bold
red at login when / or /home cross 85% usage. Deployed system-wide via
install_disk_warning() (sudo install -D -m 0644), gated inside the
apt-get block since df --output=pcent and /etc/profile.d are GNU/Debian
conventions absent on macOS. Idempotent and re-runnable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CN1KSmsuLG6TxSeN5m8xvM
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Bastien Chanot
2026-06-24 18:00:17 +02:00
co-authored by Claude Opus 4.8
parent 57cdfeaf25
commit c0fddc6f94
7 changed files with 56 additions and 0 deletions
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@@ -29,3 +29,10 @@ enable+start `gnome-remote-desktop.service`. Auth = 2 layers: shared gate creds
Listening socket + TLS + enable NOT enough alone. TPM warn `Init TPM credentials failed ... using
GKeyFile as fallback` = harmless on TPM-less host (creds → keyfile). Connect: client → ip:3389,
accept self-signed cert, gate creds, then GDM user. Supersedes LRN-003 for Wayland GNOME.
## LRN-005 — df --output=pcent is GNU-only → keep /etc/profile.d disk scripts Linux-gated
2026-06-24. `df --output=pcent` (and `/etc/profile.d` itself) are GNU coreutils / Debian conventions,
absent on macOS BSD df. Any install step deploying such a snippet system-wide must sit inside the
`command -v apt-get` (Linux) block, never the OS-agnostic path. Deploy idempotently with
`sudo install -D -m 0644 src /etc/profile.d/x.sh` (-D makes the dir, overwrite = re-runnable). Caveat:
`/etc/profile.d/*.sh` runs for LOGIN shells only — non-login terminals need `/etc/bash.bashrc` instead.