mawk 1.33 of Ubuntu 10.10 still has problems with RS="\0".
Part of boot info script where RS="\0" is used:
------------------------------------------------------------------------------------------
get_embedded_menu () {
local source=$1 titlename=$2;
# Check if magic bytes that go before the embedded menu, are present.
offset_menu=$(dd if="${source}" count=4 bs=128k 2>> ${Trash} | hexdump -v -e
'/1 "%02x"' | grep -b -o 'b0021ace000000000000000000000000');
if [ -n ${offset_menu} ] ; then
# Magic found.
titlebar_gen "${titlename}" " embedded menu";
echo
'--------------------------------------------------------------------------------'
>> "${Log1}";
# Calcutate the exact offset to the embedded menu.
offset_menu=$(( ( ${offset_menu%:*} / 2 ) + 16 ));
dd if="${source}" count=1 skip=1 bs=${offset_menu} 2>> ${Trash} |
${AWK} 'BEGIN { RS="\0" } { if (NR == 1) print $0 }' >> "${Log1}";
echo
'--------------------------------------------------------------------------------'
>> "${Log1}";
fi
}
------------------------------------------------------------------------------------------
I found a version of mawk, maintained by a new developer:
http://invisible-island.net/mawk/
New mawk changelog (debian patches included + new things):
http://invisible-island.net/mawk/CHANGES
How to reproduce:
-----------------
Download the development version of boot_info_script:
wget -O boot_info_script-gawk.sh
'http://bootinfoscript.git.sourceforge.net/git/gitweb.cgi?p=bootinfoscript/bootinfoscript;a=blob_plain;f=boot_info_script.sh;hb=2cc05957ff2c1ac777be114514e57ed54fb22989'
Replace gawk with mawk:
sed -e 's|gawk|mawk|' boot_info_script-gawk.sh >
boot_info_script-mawk-1.3.3.sh
Copy grldr (grub4dos) file to the root of a partition:
http://code.google.com/p/grub4dos-chenall/downloads/list
Compile the new version of mawk and do:
sed -e 's|gawk|/home/user/mawk-1.3.4-20100625/mawk|' boot_info_script-gawk.sh
> boot_info_script-mawk-1.3.4.sh
Run boot_info_script-gawk.sh and boot_info_script-mawk-1.3.3.sh:
sudo bash boot_info_script-gawk.sh RESULT-gawk.txt
sudo bash boot_info_script-mawk-1.3.3.sh RESULT-mawk-1.3.3.txt
sudo bash boot_info_script-mawk-1.3.4.sh RESULT-mawk-1.3.4.txt
Compare the output files:
diff -u RESULT-mawk-1.3.3.txt RESULT-gawk.txt ==> a lot of differences
diff -u RESULT-mawk-1.3.4.txt RESULT-gawk.txt ==> no difference
For mawk-1.3.3, you will see something like this:
========================== sdb1/grldr embedded menu: ===========================
--------------------------------------------------------------------------------
pxe detect
configfile
default 0
timeout 1
--------------------------------------------------------------------------------
For gawk and mawk-1.3.4, you will see something like this (correct):
========================== sdb1/grldr embedded menu: ===========================
--------------------------------------------------------------------------------
pxe detect
configfile
default 0
timeout 1
title find /menu.lst, /boot/grub/menu.lst, /grub/menu.lst
errorcheck off
configfile /menu.lst || configfile /MENU.LST
configfile /boot/grub/menu.lst || configfile /BOOT/GRUB/MENU.LST
configfile /grub/menu.lst || configfile /GRUB/MENU.LST
find --set-root --ignore-floppies --ignore-cd /menu.lst && configfile
/menu.lst
find --set-root --ignore-floppies --ignore-cd /boot/grub/menu.lst &&
configfile /boot/grub/menu.lst
find --set-root --ignore-floppies --ignore-cd /grub/menu.lst &&
configfile /grub/menu.lst
errorcheck on
commandline
title commandline
commandline
title reboot
reboot
title halt
halt
--------------------------------------------------------------------------------
Another bug in mawk is also solved in the mawk 0.3.4 version:
https://bugs.launchpad.net/ubuntu/+source/mawk/+bug/716920
Can this mawk binary be upgraded or can the default awk been set to gawk if
mawk can't be updated?
Shipping a broken awk (mawk v1.33) as default is wrong, IMHO.
mawk 0.3.4 probably solves a lot of other reported bugs too.
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https://bugs.launchpad.net/bugs/400409
Title:
RS is readonly
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