mod-swsusp.sh

   1 #!/bin/sh
   2 # geninitrd mod: swsusp
   3 #
   4 USE_SWSUSP=${USE_SWSUSP:-yes}
   5
   6 # resume device
   7 swap_dev=""
   8
   9 # setup geninitrd module
  10 # @access       public
  11 setup_mod_swsusp() {
  12         if ! is_yes "$USE_SWSUSP"; then
  13                 return
  14         fi
  15
  16         swap_dev="$(awk '/^\/dev\// { print $1 }' /proc/swaps | grep -v /dev/zram | head -1)"
  17         if [ -z "$swap_dev" ]; then
  18             warn "Cannot determine swap device. You may try add specific device to kernel command line. Disabling swsusp support."
  19             USE_SWSUSP=no
  20         else
  21             verbose "swsusp: will try to resume from swap device $swap_dev"
  22         fi
  23 }
  24
  25 # find modules for for swsusp
  26 # @access       public
  27 find_modules_swsusp() {
  28         swap_dev="$(awk '/^\/dev\// { print $1 }' /proc/swaps | grep -v /dev/zram | head -1)"
  29
  30         # save state
  31         local vgvolumes=$LVM_VGVOLUMES
  32         find_modules_for_devpath $swap_dev
  33
  34         # check for saved state, differenciate between rootfs VG
  35         if [ "$LVM_VGVOLUMES" != "$vgvolumes" ]; then
  36                 # add swap device to LVM_SUSPENDVG
  37                 LVM_SUSPENDVG="$LVM_SUSPENDVG $LVM_VGVOLUMES"
  38                 LVM_VGVOLUMES=$vgvolumes
  39                 verbose "swap device is on LVM"
  40         fi
  41 }
  42
  43 # generate initrd fragment
  44 # @access       public
  45 initrd_gen_swsusp() {
  46         if ! is_yes "$USE_SWSUSP"; then
  47                 return
  48         fi
  49
  50         verbose "Setting up swsusp..."
  51
  52         mkdir -p $DESTDIR${swap_dev%/*}
  53         inst $swap_dev $swap_dev
  54
  55         mount_dev
  56         mount_sys
  57         echo "swap_dev=$swap_dev" | add_linuxrc
  58
  59         add_linuxrc <<-'EOF'
  60         resume=no
  61         for arg in $CMDLINE; do
  62                 if [ "${arg##resume=/dev/}" != "${arg}" ]; then
  63                         swap_dev=${arg##resume=}
  64                         resume=yes
  65                 elif [ "${arg##resume=}" != "${arg}" ]; then
  66                         resume=${arg##resume=}
  67                 fi
  68         done
  69
  70         if [ "$resume" = "yes" ] && [ -n "$swap_dev" ]; then
  71                 echo "Resuming from $swap_dev..."
  72                 echo "$swap_dev" > /sys/power/resume
  73         fi
  74         EOF
  75 }