commands/update_bootcfg/update_bootcfg.sh

   1 #!/bin/sh
   2 set -e
   3
   4 ROOT=`printroot -r`
   5 DEFAULTCFG=/etc/boot.cfg.default
   6 LOCALCFG=/etc/boot.cfg.local
   7 TMP=/boot.cfg.temp
   8 DIRSBASE=/boot/minix
   9 INHERIT="ahci acpi no_apic"
  10
  11 filter_entries()
  12 {
  13         # This routine performs three tasks:
  14         # - substitute variables in the configuration lines;
  15         # - remove multiboot entries that refer to nonexistent kernels;
  16         # - adjust the default option for line removal and different files.
  17         # The last part is handled by the awk part of the routine.
  18
  19         while read line
  20         do
  21                 # Substitute variables like $rootdevname and $args
  22                 line=$(eval echo \"$line\")
  23
  24                 if ! echo "$line" | grep -sq '^menu=.*multiboot'
  25                 then
  26                         echo "$line"
  27                         continue
  28                 fi
  29
  30                 # Check if the referenced kernel is present
  31                 kernel=`echo "$line" | sed -n 's/.*multiboot[[:space:]]*\(\/[^[:space:]]*\).*/\1/p'`
  32                 if [ ! -r "$kernel" ]
  33                 then
  34                         echo "Warning: config contains entry for \"$kernel\" which is missing! Entry skipped." 1>&2
  35                         echo "menu=SKIP"
  36                 else
  37                         echo "$line"
  38                 fi
  39         done | awk '
  40                 BEGIN {
  41                         count=1
  42                         base=0
  43                         default=0
  44                 }
  45                 /^menu=SKIP$/ {
  46                         # A menu entry discarded by the kernel check above
  47                         skip[count++]=1
  48                         next
  49                 }
  50                 /^menu=/ {
  51                         # A valid menu entry
  52                         skip[count++]=0
  53                         print
  54                         next
  55                 }
  56                 /^BASE=/ {
  57                         # The menu count base as passed in by count_entries()
  58                         sub(/^.*=/,"",$1)
  59                         base=$1+0
  60                         next
  61                 }
  62                 /^default=/ {
  63                         # The default option
  64                         # Correct for the menu count base and store for later
  65                         sub(/^.*=/,"",$1)
  66                         default=$1+base
  67                         next
  68                 }
  69                 {
  70                         # Any other line
  71                         print
  72                 }
  73                 END {
  74                         # If a default was given, correct for removed lines
  75                         # (do not bother to warn if the default itself is gone)
  76                         if (default) {
  77                                 for (i = default; i > 0; i--)
  78                                         if (skip[i]) default--;
  79                                 print "default=" default
  80                         }
  81                 }
  82         '
  83 }
  84
  85 count_entries()
  86 {
  87         echo -n "BASE="; grep -cs '^menu=' "$1"
  88 }
  89
  90 if [ ! -b "$ROOT" ]
  91 then
  92         echo root device $ROOT not found
  93         exit 1
  94 fi
  95
  96 rootdevname=`echo $ROOT | sed 's/\/dev\///'`
  97
  98 # Construct a list of inherited arguments for boot options to use. Note that
  99 # rootdevname must not be passed on this way, as it is changed during setup.
 100 args=""
 101 for k in $INHERIT; do
 102         if sysenv | grep -sq "^$k="; then
 103                 kv=$(sysenv | grep "^$k=")
 104                 args="$args $kv"
 105         fi
 106 done
 107
 108 if [ -r $DEFAULTCFG ]
 109 then
 110         filter_entries < $DEFAULTCFG >> $TMP
 111 fi
 112
 113 if [ -d /boot/minix_latest -o -h /boot/minix_latest ]
 114 then
 115         latest=`basename \`stat -f "%Y" /boot/minix_latest\``
 116 fi
 117
 118 [ -d $DIRSBASE ] && for i in `ls $DIRSBASE/`
 119 do
 120         build_name="`basename $i`"
 121         if [ "$build_name" != "$latest" ]
 122         then
 123                 echo "menu=Start MINIX 3 ($build_name):load_mods $DIRSBASE/$i/mod*;multiboot $DIRSBASE/$i/kernel rootdevname=$rootdevname $args" >> $TMP
 124         fi
 125 done
 126
 127 if [ -r $LOCALCFG ]
 128 then
 129         # If the local config supplies a "default" option, we assume that this
 130         # refers to one of the options in the local config itself. Therefore,
 131         # we increase this default by the number of options already present in
 132         # the output so far. To this end, count_entries() inserts a special
 133         # token that is recognized and filtered out by filter_entries().
 134         (count_entries $TMP; cat $LOCALCFG) | filter_entries >> $TMP
 135 fi
 136
 137 mv $TMP /boot.cfg
 138
 139 sync