nixCraft

fangorn · #1 (**permalink**) 10-06-2006, 06:44 PM

Hi!

I have a function in sh (FreeBSD) which looks like this:

Code:

config_replace() {
        SOURCE=$2
        TARGET=$3
        VARS_FILE=M_Config_vars_only_$1.inc
SED_CMD_O=""
CMD_00=""
exec 3<> ${VARS_FILE}
while read line <&3
do {
if [ ! `echo $line |grep "^#"` ]
then
MY_VAR=`echo $line|awk -F"=" '{print $1}'`
MY_VAL=`echo $line|awk -F"=" '{print $2}'`
if [ `grep -so -m 1 "__${MY_VAR}__" $SOURCE` ]
then
SED_CMD_0=$(eval echo -n ${SED_CMD_0} -e 's,__${MY_VAR}__,${MY_VAL},g')
fi
fi
}
done
echo "${SED_CMD_0}">/tmp/tmp.cmd
exec 3>&-
ble=$(sed -e "s,-e\ s,-e\ \'s,g" -e "s,\,g,\,g\',g" /tmp/tmp.cmd)
eval sed $ble $SOURCE > $TARGET
}

is fed with a config file like this:

Code:

M_HOST_SHORT=${M_NAME}
M_DOMAIN="somedomain.com"
M_HOST_LONG=${M_HOST_SHORT}.${M_DOMAIN}
M_SRV_NO="13"
M_APP_NET_PFX="192.168.100"
M_NFS_NET_PFX="192.168.101"
M_NFS_IP=${M_NFS_NET_PFX}.${M_SRV_NO}
M_APP_IP=${M_APP_NET_PFX}.${M_SRV_NO}

and so on. I call it like this:

Code:

config_replace somemachine ${SRC_DIR}/some.conf ${TARGET_DIR}/some.conf

and naturally it replaces all variables like __M_APP_IP__ it finds in some.conf

The function works fine mostly, there's but one problem: the last variable in the config file doesn't get "evaluated" (for the lack of a better word) ONLY if it's a complex variable. To clarify things:

If the last variable found in some.conf is M_HOST_SHORT, or anything with one value, or even one variable - works fine.

If on the other hand it's M_APP_IP - no values will be placed where they shoud, just the "${M_APP_NET_PFX}.${M_SRV_NO}".

And this only happens for the last variable so I assume there's something wrong with the loop. Can't find what, so maybe you could help me understand my own code

. Thanks in advance.

--
Best Regards,
Daniel

sweta · #2 (**permalink**) 10-10-2006, 03:37 AM

Wow that script is really badly written. All I can say is run script as follows to see what is going on:

Code:

sh -x config_replace somemachine ${SRC_DIR}/some.conf ${TARGET_DIR}/some.conf

or better pass -v option too

Code:

sh x- v- config_replace somemachine ${SRC_DIR}/some.conf ${TARGET_DIR}/some.conf

Above two statements will give you lots of debugging info.

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Weird variable evaluation problem (FreeBSD, sh)

Weird variable evaluation problem (FreeBSD, sh)

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