update_bootcfg(8): various improvements
- inherit a predefined set of system environment variables (the current set of inherited variables is: ahci; acpi; no_apic); - auto-adjust the default menu option when lines are auto-removed; - add variable substitution support for /etc/boot.cfg.local; - make default menu options in boot.cfg.local relative to itself, allowing one to set the default to a menu option from this file.
This commit is contained in:
David van Moolenbroek
parent
3fab01cdb2
commit
ceefd434f1
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@ -6,26 +6,85 @@ DEFAULTCFG=/etc/boot.cfg.default
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LOCALCFG=/etc/boot.cfg.local
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TMP=/boot.cfg.temp
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DIRSBASE=/boot/minix
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INHERIT="ahci acpi no_apic"
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filter_missing_entries()
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filter_entries()
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{
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# This routine performs three tasks:
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# - substitute variables in the configuration lines;
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# - remove multiboot entries that refer to nonexistent kernels;
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# - adjust the default option for line removal and different files.
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# The last part is handled by the awk part of the routine.
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while read line
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do
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if ! echo "$line" | grep -s -q 'multiboot'
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# Substitute variables like $rootdevname and $args
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line=$(eval echo \"$line\")
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if ! echo "$line" | grep -sq '^menu=.*multiboot'
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then
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echo "$line"
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continue
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fi
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# Check if kernel presents
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# Check if the referenced kernel is present
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kernel=`echo "$line" | sed -n 's/.*multiboot[[:space:]]*\(\/[^[:space:]]*\).*/\1/p'`
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if [ ! -r "$kernel" ]
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then
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echo "Warning: config contains entry for \"$kernel\" which is missing! Entry skipped." 1>&2
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echo "menu=SKIP"
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else
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echo "$line"
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fi
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done
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done | awk '
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BEGIN {
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count=1
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base=0
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default=0
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}
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/^menu=SKIP$/ {
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# A menu entry discarded by the kernel check above
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skip[count++]=1
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next
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}
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/^menu=/ {
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# A valid menu entry
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skip[count++]=0
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print
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next
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}
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/^BASE=/ {
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# The menu count base as passed in by count_entries()
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sub(/^.*=/,"",$1)
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base=$1+0
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next
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}
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/^default=/ {
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# The default option
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# Correct for the menu count base and store for later
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sub(/^.*=/,"",$1)
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default=$1+base
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next
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}
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{
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# Any other line
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print
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}
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END {
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# If a default was given, correct for removed lines
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# (do not bother to warn if the default itself is gone)
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if (default) {
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for (i = default; i > 0; i--)
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if (skip[i]) default--;
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print "default=" default
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}
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}
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'
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}
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count_entries()
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{
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echo -n "BASE="; grep -cs '^menu=' "$1"
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}
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if [ ! -b "$ROOT" ]
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@ -36,14 +95,22 @@ fi
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rootdevname=`echo $ROOT | sed 's/\/dev\///'`
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# Construct a list of inherited arguments for boot options to use. Note that
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# rootdevname must not be passed on this way, as it is changed during setup.
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args=""
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for k in $INHERIT; do
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if sysenv | grep -sq "^$k="; then
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kv=$(sysenv | grep "^$k=")
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args="$args $kv"
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fi
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done
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if [ -r $DEFAULTCFG ]
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then
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default_cfg=`cat $DEFAULTCFG`
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# Substitute variables like $rootdevname
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echo "$default_cfg" | while read line; do eval echo \"$line\" | filter_missing_entries >> $TMP; done
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filter_entries < $DEFAULTCFG >> $TMP
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fi
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if [ -e /boot/minix_latest -a -d /boot/minix_latest -o -h /boot/minix_latest ]
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if [ -d /boot/minix_latest -o -h /boot/minix_latest ]
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then
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latest=`basename \`stat -f "%Y" /boot/minix_latest\``
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fi
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@ -53,11 +120,19 @@ do
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build_name="`basename $i`"
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if [ "$build_name" != "$latest" ]
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then
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echo "menu=Start MINIX 3 ($build_name):load_mods $DIRSBASE/$i/mod*;multiboot $DIRSBASE/$i/kernel rootdevname=$rootdevname" >> /$TMP
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echo "menu=Start MINIX 3 ($build_name):load_mods $DIRSBASE/$i/mod*;multiboot $DIRSBASE/$i/kernel rootdevname=$rootdevname $args" >> $TMP
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fi
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done
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[ -r $LOCALCFG ] && cat $LOCALCFG | filter_missing_entries >> $TMP
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if [ -r $LOCALCFG ]
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then
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# If the local config supplies a "default" option, we assume that this
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# refers to one of the options in the local config itself. Therefore,
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# we increase this default by the number of options already present in
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# the output so far. To this end, count_entries() inserts a special
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# token that is recognized and filtered out by filter_entries().
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(count_entries $TMP; cat $LOCALCFG) | filter_entries >> $TMP
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fi
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mv $TMP /boot.cfg
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@ -1,8 +1,8 @@
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clear=1
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timeout=5
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default=2
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menu=Start MINIX 3:load_mods /boot/minix_default/mod*;multiboot /boot/minix_default/kernel rootdevname=$rootdevname
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menu=Start latest MINIX 3:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname
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menu=Start latest MINIX 3 in single user mode:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname bootopts=-s
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menu=Start MINIX 3:load_mods /boot/minix_default/mod*;multiboot /boot/minix_default/kernel rootdevname=$rootdevname $args
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menu=Start latest MINIX 3:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname $args
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menu=Start latest MINIX 3 in single user mode:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname bootopts=-s $args
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menu=Edit menu option:edit
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menu=Drop to boot prompt:prompt
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