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rc.S: early mount of /dev on a devtmpfs

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This commit is contained in:
Tom Mortensen
2025-06-25 15:10:09 -07:00
parent 732129de72
commit bce42c6657
1 changed files with 22 additions and 12 deletions
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34
etc/rc.d/rc.S
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@@ -11,6 +11,10 @@
# Set the path.
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin
# Limetech - Mount /dev on a devtmpfs
/bin/mkdir -p /dev
/sbin/mount -n -t devtmpfs devtmpfs /dev
# Mount /proc if it is not already mounted:
if [[ ! -d /proc/sys ]]; then
/sbin/mount -v proc /proc -n -t proc 2>/dev/null
@@ -60,21 +64,25 @@ fi
# LimeTech - determine if the 'unraidlabel' kernel append parameter was
# provided to override which device is mounted for /boot (default: UNRAID)
UNRAIDLABEL="UNRAID"
UNRAIDROOT=
UNRAIDBOOT=
ROOT=
set -- $(/bin/cat /proc/cmdline)
for x in "$@"; do
case "$x" in
unraidboot=*)
UNRAIDBOOT="${x#unraidboot=}"
;;
unraidlabel=*)
UNRAIDLABEL="${x#unraidlabel=}"
;;
root=*)
UNRAIDROOT="${x#root=}"
ROOT="${x#root=}"
;;
esac
done
[[ -z "$UNRAIDBOOT" ]] && UNRAIDBOOT="$UNRAIDLABEL"
# LimeTech - poll for device with $UNRAIDLABEL present, with 30-sec timeout
# this serves to synchronize this script with USB subsystem
# terminate the boot sequence
abort() {
/bin/umount -a
read -p "$1 - press ENTER key to reboot..."
@@ -82,17 +90,19 @@ abort() {
/sbin/reboot -fd
}
# find which device/partition has the UNRAIDBOOT label
find_device() {
# find which USB flash device/partition has the indicated label
local i
for i in {1..30}; do
DEVICE=$(/sbin/blkid -L $UNRAIDLABEL)
DEVICE=$(/sbin/blkid -L $UNRAIDBOOT)
[[ -z $DEVICE ]] && /bin/sleep 1 || return 0
done
return 1
}
/bin/echo -n "waiting up to 30 sec for device with label $UNRAIDLABEL to come online ... "
# LimeTech - poll for device with $UNRAIDBOOT present, with 30-sec timeout
# this serves to synchronize this script with kernel device discovery
/bin/echo -n "waiting up to 30 sec for device with BOOT $UNRAIDBOOT to come online ... "
find_device && /bin/echo "found $DEVICE" || abort "not found"
# detect filesystem from boot device
@@ -140,7 +150,7 @@ bzmount(){
/sbin/mount -v -t overlay overlay -o lowerdir=/$MNTDIR,upperdir=/var/local/overlay/$MNTDIR,workdir=/var/local/overlay-work/$MNTDIR /$MNTDIR
}
if [[ $UNRAIDROOT == "" ]]; then
if [[ $ROOT == "" ]]; then
bzcheck "bzimage"
bzcheck "bzroot"
bzcheck "bzroot-gui"
@@ -164,15 +174,15 @@ if [[ $UNRAIDROOT == "" ]]; then
/bin/mv -f /var/empty/* /var/log
else
/bin/echo "Checking root filesystem"
/sbin/fsck -C -a $UNRAIDROOT
/sbin/fsck -C -a $ROOT
RETVAL=$?
[[ $RETVAL -ge 2 ]] && abort "fsck failed with return value $RETVAL"
# Remount the root filesystem in read-write mode
/bin/echo "Remounting $UNRAIDROOT with read-write enabled."
/bin/echo "Remounting $ROOT with read-write enabled."
/sbin/mount -w -v -n -o remount /
RETVAL=$?
[[ $RETVAL -gt 0 ]] && abort "failed to remount $UNRAIDROOT r/w with return value $RETVAL"
[[ ! -f /etc/rc.d/rc.S.cont ]] && abort "unable to continue - you must remove 'root=$UNRAIDROOT' from syslinux.cfg"
[[ $RETVAL -gt 0 ]] && abort "failed to remount $ROOT r/w with return value $RETVAL"
[[ ! -f /etc/rc.d/rc.S.cont ]] && abort "unable to continue - you must remove 'root=$ROOT' from syslinux.cfg"
fi
# set permissions for non vfat boot on /boot