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  2. #!/bin/busybox sh
  4. rescue_shell() {
  5. printf '\e[1;31m' # bold red foreground
  6. printf "$1 Dropping you to a shell."
  7. printf "\e[00m\n" # normal colour foreground
  8. # load the keymap
  9. [ -f /keymap ] && loadkmap < /keymap
  10. exec setsid cttyhack /bin/sh
  11. }
  13. # initialise
  14. mount -t proc none /proc || rescue_shell "mount /proc failed."
  15. mount -t sysfs none /sys || rescue_shell "mount /sys failed."
  16. mount -t devtmpfs none /dev || rescue_shell "mount /dev failed."
  18. # set hardcoded default values
  19. crypt_root=""
  20. root=""
  21. resume=""
  22. mount_ro_rw='ro'
  24. # parse kernel command line
  25. for p in $(cat /proc/cmdline); do
  26. case "${p}" in
  27. # crypt_root=*)
  28. # crypt_root="${p#*=}"
  29. # ;;
  30. root=*)
  31. root="${p#*=}"
  32. ;;
  33. resume=*)
  34. resume="${p#*=}"
  35. ;;
  36. ro|rw)
  37. mount_ro_rw="${p}"
  38. ;;
  39. esac
  40. done
  43. # # decrypt
  44. # # convert UUID or LABEL to device node
  45. # crypt_root="$(findfs "${crypt_root}")"
  46. # # decryption is first tried using the key file /crypto_key.bin
  47. # # if this fails, prompt for a password
  48. # cryptsetup open "${crypt_root}" lvm --type luks --key-file /crypto_key.bin || \
  49. # cryptsetup open "${crypt_root}" lvm --type luks || \
  50. # rescue_shell "Decryption failed."
  52. # activate lvm
  53. # create /dev/mapper/control
  54. lvm vgscan --mknodes || rescue_shell "vgscan failed."
  55. # activate all LVM volumes
  56. lvm vgchange --sysinit -a ly || rescure_shell "vgchange failed."
  57. # create device nodes for the volumes
  58. lvm vgscan --mknodes || rescue_shell "vgscan failed."
  60. # mount the real root
  61. # convert UUID or LABEL to device node
  62. root="$(findfs "${root}")"
  63. mount -o "${mount_ro_rw}" "${root}" /mnt/root || rescue_shell "mount ${root} failed."
  65. # enable resume from hibernate
  66. if [ -n "${resume}" ]; then
  67. # copy the major:minor of the swap block device into /sys/power/resume
  68. printf '%u:%u\n' $(stat -L -c '0x%t 0x%T' "${resume}") > /sys/power/resume || \
  69. rescue_shell "Activating resume failed."
  70. fi
  72. # clean up
  73. umount /proc
  74. umount /sys
  75. umount /dev
  77. # boot the real system
  78. exec switch_root /mnt/root /sbin/init
  79.  
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