funman300
126b03ad26
If `findmnt -no PARTUUID /` returns nothing (root on LVM, no GPT, unusual mount state) the script would silently write a broken resume=PARTUUID= line to /etc/kernel/cmdline. Bail with an error message instead. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
80 lines
2.7 KiB
Bash
Executable File
80 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
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# enable-hibernation.sh — one-time setup for laptop hibernation on btrfs.
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# Idempotent: re-runs are no-ops once everything is in place. Run with sudo.
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# After successful run, reboot before testing `systemctl hibernate`.
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set -euo pipefail
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if [ "$EUID" -ne 0 ]; then
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echo "Run as root: sudo bash $0" >&2
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exit 1
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fi
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SWAPFILE=/swapfile
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SWAPSIZE=16g
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ROOT_PARTUUID=$(findmnt -no PARTUUID /)
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[ -n "$ROOT_PARTUUID" ] || { echo "ERROR: could not determine root PARTUUID via findmnt." >&2; exit 1; }
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echo "==> Step 1/6: ensure swap file exists at $SWAPFILE (size $SWAPSIZE)"
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if [ ! -f "$SWAPFILE" ]; then
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btrfs filesystem mkswapfile --size "$SWAPSIZE" "$SWAPFILE"
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echo " created $SWAPFILE"
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else
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actual_bytes=$(stat -c %s "$SWAPFILE")
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min_bytes=$((14 * 1024 * 1024 * 1024))
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if [ "$actual_bytes" -lt "$min_bytes" ]; then
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echo "ERROR: $SWAPFILE exists but is smaller than 14 GiB (got $actual_bytes bytes)." >&2
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echo " Remove it manually and re-run." >&2
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exit 1
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fi
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echo " already exists ($((actual_bytes / 1024 / 1024 / 1024)) GiB) — skipping creation"
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fi
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echo "==> Step 2/6: activate swap and persist in fstab"
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if ! swapon --show | grep -q "^$SWAPFILE "; then
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swapon "$SWAPFILE"
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echo " swapon $SWAPFILE"
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else
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echo " already active — skipping swapon"
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fi
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if ! grep -qE "^$SWAPFILE\s" /etc/fstab; then
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printf '%s\tnone\tswap\tdefaults\t0 0\n' "$SWAPFILE" >> /etc/fstab
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echo " appended to /etc/fstab"
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else
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echo " /etc/fstab already references $SWAPFILE — skipping"
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fi
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echo "==> Step 3/6: compute resume params"
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RESUME_OFFSET=$(btrfs inspect-internal map-swapfile -r "$SWAPFILE")
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echo " resume=PARTUUID=$ROOT_PARTUUID"
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echo " resume_offset=$RESUME_OFFSET"
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echo "==> Step 4/6: ensure 'resume' hook in /etc/mkinitcpio.conf"
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if grep -qE "^HOOKS=\(.*\bresume\b.*\)" /etc/mkinitcpio.conf; then
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echo " resume hook already present — skipping"
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else
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sed -i -E 's/(^HOOKS=\(.*\bblock\b)/\1 resume/' /etc/mkinitcpio.conf
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if ! grep -qE "^HOOKS=\(.*\bresume\b.*\)" /etc/mkinitcpio.conf; then
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echo "ERROR: failed to insert 'resume' hook. Check /etc/mkinitcpio.conf manually." >&2
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exit 1
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fi
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echo " inserted 'resume' after 'block'"
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fi
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echo "==> Step 5/6: append resume params to /etc/kernel/cmdline"
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if grep -q "resume=" /etc/kernel/cmdline; then
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echo " cmdline already contains resume= — skipping"
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else
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sed -i "1 s|\$| resume=PARTUUID=$ROOT_PARTUUID resume_offset=$RESUME_OFFSET|" /etc/kernel/cmdline
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echo " appended to /etc/kernel/cmdline"
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fi
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echo "==> Step 6/6: regenerate UKI"
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mkinitcpio -P
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echo
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echo "Done. Reboot to activate hibernation:"
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echo " sudo reboot"
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echo
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echo "After reboot, test with: systemctl hibernate"
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