Early Boot `/usr` Separation: Transition RC Scripts to rootfs-only (`/`) Binaries

[sighook]

Description:
Currently, several rc scripts in the package rely on binaries located in /usr (/usr/bin/logger, /usr/sbin/syslogd, /usr/bin/find, etc.) and resources like fonts and keymaps under /usr. On systems with a separate /usr filesystem, these scripts fail in early boot, leading to:

• Lost boot logs when logger or syslogd is invoked too early.
• Failed /tmp and /var/lock cleanup using /usr/bin/find.
• Keyboard, console, and font setup (loadkeys, setterm, setfont) may fail if font/keymap files are only in /usr.

Current Workarounds:

• BOOTLOG=YES captures early boot logs via bootlogd.
• Some scripts wrap /usr binaries with existence checks, but usage is inconsistent.
• Users may need to manually ensure /usr is available early.

Proposed Transition / Solution:

1. Rootfs-only binaries in early boot:

   • Move essential binaries to /bin or /sbin (or ensure copies exist).

     • Examples: logger, syslogd, find, loadkeys, setterm, setfont.

2. Minimal resources on rootfs:

   • Include a minimal set of fonts and keymaps under /lib or /etc for early console setup.

3. Early-boot safe scripts:

   • Replace /usr/bin/find calls with rootfs-safe shell loops.
   • Replace /usr/bin/logger calls with a wrapper that falls back to stdout.

4. Conditional execution / fallbacks:

   • If binaries or resources are missing, skip gracefully instead of failing early boot.

5. Documentation:

   • Document changed fonts/keymaps location in rc.conf manual page.
   • Document that /usr may not be available in early boot.
   • Recommend bootlogd for capturing early messages.

Goal:

• Ensure that all early-boot steps (cleanup, console setup, minimal logging) work reliably before /usr is mounted, while transitioning multiuser services to run after /usr becomes available.
• Keep scripts minimal, readable, and KISS-friendly.

Notes / References:

• Historical approaches in Slackware, CRUX, Debian pre-systemd, and Red Hat pre-systemd.
• Rootfs-only early boot ensures robust system startup even with a separate /usr.

[sighook]

Affected pkgsrc-core packages:

• util-linux: /usr/bin/logger, /usr/bin/setterm
• sysklogd: /usr/sbin/syslogd
• findutils: /usr/bin/find
• kbd: /usr/bin/loadkeys, /usr/bin/setfont and corresponding /usr/share/* files

[sighook]

Early boot must not rely on /usr/share/zoneinfo.

/etc/localtime should point to a rootfs copy (e.g., /lib/zoneinfo/UTC) for early scripts.

Full /usr/share/zoneinfo can be used safely after /usr is mounted, in multiuser mode (rc.multi).

[sighook]

related issue: #6