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] [DESTDIR]" >&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.$$; exit $e' 0 2
  29
  30 mdec=/usr/mdec  # bootstraps
  31 # If no DESTDIR specified, then act on / or on the current chroot
  32 DESTDIR=
  33 # Check arguments.
  34 case "$#:$1" in
  35 1:bootable | 1:hdboot )
  36         # LSC Broken, if $# == 1, then $2,$3 are not set...
  37         action=$1
  38         ;;
  39 2:bootable | 2:hdboot )
  40         action=$1 DESTDIR=$2
  41         ;;
  42 *)      usage
  43 esac
  44
  45 # Get the device table.
  46 FSTAB=/etc/fstab
  47 touch $FSTAB
  48 if grep -q "Poor man" $FSTAB
  49 then    . $FSTAB
  50 else    root="`awk <$FSTAB '{ if($2=="/") { print $1 } }'`"
  51 fi
  52
  53 # The real root device may be the RAM disk.
  54 realroot=`printroot -r`
  55
  56 # If it's an initial fstab, pretend root is real root
  57 if [ "$root" = "/dev/ROOT" -o -z "$root" ]
  58 then    root=$realroot
  59 fi
  60
  61 case $action in
  62 bootable | hdboot)
  63         # We need the root device.
  64
  65         if [ $realroot = $root ]
  66         then
  67                 rootdir=
  68         else
  69                 umount $root 2>/dev/null
  70                 mount $root /mnt || exit
  71                 rootdir=/mnt
  72         fi
  73 esac
  74
  75 case $action in
  76 hdboot)
  77         sh tell_config OS_RELEASE . OS_VERSION >/tmp/mkb.$$
  78         version=`sed 's/["      ]//g;/^$/d' </tmp/mkb.$$`
  79
  80         # Retrieve the git revision; this only succeeds
  81         # if git is available, it's a git checkout, *and*
  82         # there are no uncommitted changes.
  83         if git diff --quiet 2>/dev/null
  84         then    gitrev="-`git describe --always`"
  85         fi
  86
  87         revision=`cat revision 2>/dev/null`
  88
  89         if [ -z "$revision" ]
  90         then    rrevision=""
  91                 gitrev=""
  92         else    rrevision=r$revision
  93         fi
  94
  95         oldrev=$revision
  96
  97         if [ -z "$revision" ]
  98         then
  99                 revision=0
 100                 rrevision=""
 101         else
 102                 revision=`expr $revision + 1`
 103                 rrevision=r$revision
 104         fi
 105
 106         target="${version}${rrevision}${gitrev}"
 107
 108         rotate_oldest "$DESTDIR/boot/minix"
 109
 110         # rotate system processes. We assume latest ones are in
 111         # /boot/modules/.temp and we maintain /boot/modules/ by ourselves.
 112         [ -d $DESTDIR/boot/minix/.temp ] || exit 1
 113         rm -rf $DESTDIR/boot/minix/"$target"/
 114         mv $DESTDIR/boot/minix/.temp $DESTDIR/boot/minix/"$target"
 115         rm -f $DESTDIR/boot/minix_latest
 116         ln -s minix/"$target" $DESTDIR/boot/minix_latest
 117
 118         # Save the revision number.
 119         test "$revision" != "$oldrev" && echo $revision >revision
 120
 121         test $realroot != $root && umount $root
 122         echo "Done."
 123         ;;
 124 esac
 125 sync
 126 exit 0