releasetools/mkboot

   1 #!/bin/sh
   2 #
   3 #       mkboot 2.0 - make root device bootable, etc.
   4 #                                                       Author: Kees J. Bot
   5
   6 usage() {
   7         echo "Usage: $0 [bootable | hdboot]" >&2
   8         exit 1
   9 }
  10
  11 rotate_oldest() {
  12         base_dir="$1"
  13         set -- `ls -t "$base_dir"`
  14
  15         case $# in
  16         0|1|2|3)
  17                 # Not much there, do not remove a thing.
  18                 ;;
  19         *)
  20                 # Remove the third-newest image in /boot/$hdboot_t, but
  21                 # only if there's an older one (which is kept).
  22                 echo "rm $root:$base_dir/$3"
  23                 rm -rf "$base_dir/$3"
  24         esac
  25 }
  26
  27
  28 trap 'e=$?; rm -f /tmp/mkb.$$; exit $e' 0 2
  29
  30 mdec=/usr/mdec  # bootstraps
  31
  32 # Check arguments.
  33 case "$#:$1" in
  34 1:bootable | 1:hdboot )
  35         action=$1 dev=$2 size=$3
  36         ;;
  37 *)      usage
  38 esac
  39
  40 # Get the device table.
  41 FSTAB=/etc/fstab
  42 touch $FSTAB
  43 if grep -q "Poor man" $FSTAB
  44 then    . $FSTAB
  45 else    root="`awk <$FSTAB '{ if($2=="/") { print $1 } }'`"
  46 fi
  47
  48 # The real root device may be the RAM disk.
  49 realroot=`printroot -r`
  50
  51 # If it's an initial fstab, pretend root is real root
  52 if [ "$root" = "/dev/ROOT" -o -z "$root" ]
  53 then    root=$realroot
  54 fi
  55
  56 case $action in
  57 bootable | hdboot)
  58         # We need the root device.
  59
  60         if [ $realroot = $root ]
  61         then
  62                 rootdir=
  63         else
  64                 umount $root 2>/dev/null
  65                 mount $root /mnt || exit
  66                 rootdir=/mnt
  67         fi
  68 esac
  69
  70 case $action in
  71 hdboot)
  72         sh tell_config OS_RELEASE . OS_VERSION >/tmp/mkb.$$
  73         version=`sed 's/["      ]//g;/^$/d' </tmp/mkb.$$`
  74
  75         # Retrieve the git revision; this only succeeds
  76         # if git is available, it's a git checkout, *and*
  77         # there are no uncommitted changes.
  78         if git diff --quiet 2>/dev/null
  79         then    gitrev="-`git describe --always`"
  80         fi
  81
  82         revision=`cat revision 2>/dev/null`
  83
  84         if [ -z "$revision" ]
  85         then    rrevision=""
  86                 gitrev=""
  87         else    rrevision=r$revision
  88         fi
  89
  90         oldrev=$revision
  91
  92         if [ -z "$revision" ]
  93         then
  94                 revision=0
  95                 rrevision=""
  96         else
  97                 revision=`expr $revision + 1`
  98                 rrevision=r$revision
  99         fi
 100
 101         target="${version}${rrevision}${gitrev}"
 102
 103         rotate_oldest "$rootdir/boot/minix"
 104
 105         # rotate system processes. We assume latest ones are in
 106         # /boot/modules/.temp and we maintain /boot/modules/ by ourselves.
 107         [ -d /boot/minix/.temp ] || exit 1
 108         rm -rf /boot/minix/"$target"/
 109         mv /boot/minix/.temp /boot/minix/"$target"
 110         rm -f /boot/minix_latest
 111         ln -s minix/"$target" /boot/minix_latest
 112
 113         # Save the revision number.
 114         test "$revision" != "$oldrev" && echo $revision >revision
 115
 116         test $realroot != $root && umount $root
 117         echo "Done."
 118         ;;
 119 esac
 120 sync
 121 exit 0