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Update configuration.nix

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ska
2025-12-22 15:58:52 +00:00
parent 4c5ddf223c
commit 70a55816ce
1 changed files with 11 additions and 13 deletions
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24
configuration.nix
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@@ -212,13 +212,13 @@
############################################################ ############################################################
systemd.services.shutdown-on-root-usb-loss = { systemd.services.shutdown-on-root-usb-loss = {
description = "Shutdown if USB device backing / disappears"; description = "Shutdown if device backing / disappears";
wantedBy = [ "multi-user.target" ]; wantedBy = [ "multi-user.target" ];
after = [ "local-fs.target" ]; after = [ "local-fs.target" ];
serviceConfig = { serviceConfig = {
Type = "simple"; Type = "simple";
ExecStart = pkgs.writeShellScript "watch-root-usb" '' ExecStart = pkgs.writeShellScript "watch-root-device" ''
set -e set -e
FINDMNT=${pkgs.util-linux}/bin/findmnt FINDMNT=${pkgs.util-linux}/bin/findmnt
@@ -227,23 +227,21 @@
SLEEP=${pkgs.coreutils}/bin/sleep SLEEP=${pkgs.coreutils}/bin/sleep
SYSTEMCTL=${pkgs.systemd}/bin/systemctl SYSTEMCTL=${pkgs.systemd}/bin/systemctl
# Resolve root source
ROOT_SRC="$($FINDMNT -n -o SOURCE / || true)" ROOT_SRC="$($FINDMNT -n -o SOURCE / || true)"
[ -z "$ROOT_SRC" ] && exit 0 [ -z "$ROOT_SRC" ] && exit 0
if [[ "$ROOT_SRC" == /dev/dm-* ]]; then # Walk up to the top-level block device
PARENT="$($LSBLK -no PKNAME "$ROOT_SRC")" DEV="$ROOT_SRC"
ROOT_DEV="/dev/$PARENT" while PARENT="$($LSBLK -no PKNAME "$DEV" 2>/dev/null)"; [ -n "$PARENT" ]; do
else DEV="/dev/$PARENT"
ROOT_DEV="$ROOT_SRC" done
fi
TRAN="$($LSBLK -no TRAN "$ROOT_DEV" || true)" DEV_NAME="$($BASENAME "$DEV")"
[ "$TRAN" != "usb" ] && exec $SLEEP infinity
DEV_NAME="$($BASENAME "$ROOT_DEV")"
# Watch until the block device disappears
while [ -e "/sys/class/block/$DEV_NAME" ]; do while [ -e "/sys/class/block/$DEV_NAME" ]; do
$SLEEP 1 $SLEEP 0.5
done done
$SYSTEMCTL poweroff $SYSTEMCTL poweroff