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Date:      Mon, 17 Jan 2000 16:46:03 -0800 (PST)
From:      David Wolfskill <dhw@whistle.com>
To:        freebsd-questions@freebsd.org
Subject:   /bin/sh in FreeBSD-2.10-R gets "Syntax error: Bad substitution"
Message-ID:  <200001180046.QAA73150@pau-amma.whistle.com>
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One of our servers is (still!) running FreeBSD-2.1.0-R (because I
haven't figured out how to upgrade it with as little disruption as I'm
comfortable with).

I've been upgrading the version of the BIND package running on various
machines -- a Solaris 2.6 box & 3 FreeBSD (3.2-R) boxen at home yesterday,
and I did a couple of FreeBSD boxen here at work this morning (3.1-R &
2.2.6-R).

But this one that's running 2.1.0-R chokes in trying to deal with the
src/port/settings script during the initial "make clean":

whistle# 27 make clean
Making /usr/local/src/bind-8.2.2.P5/src/.systype
Making .settings
port/settings: 1: Syntax error: Bad substitution
*** Error code 2

Stop.


OK; so that's a Bad Thing.  :-(

So I tried to figure out what was going on:

whistle# 35 make -n
set -e;  version=`cat Version`;  systype=`sh port/systype .systype`;  if [ $systype = "unknown" ]; then  echo "There is no BIND port for this system in this kit.";  else  settings=`sh port/settings .settings  < port/$systype/Makefile.set`;  PATH=`pwd`/port/$systype/bin:$PATH; export PATH;  for x in include port lib bin; do  ( cd $x; pwd;  eval "make $settings  SYSTYPE=$systype  VER=$version  all";  );  done  fi

OK... so port/settings is just a shell script; I copied it to /tmp and
inserted

set -x
set -v

just after the #!/bin/sh line.

Then:

whistle# 36 sh
# set -e
# export version;version=`cat Version`
# echo $version
8.2.2-P5
# export systype;systype=`sh port/systype .systype`
Using .systype
# echo $systype
freebsd
# export settings;settings=`sh /tmp/settings .settings  < port/$systype/Makefile.set`
+ set -v
+ cachefile=.settings
+ [ -f .settings ]
+ echo Making .settings
Making .settings
+ LC_COLLATE=C
+ export LC_COLLATE
+ result=
/tmp/settings: 1: Syntax error: Bad substitution
whistle# 37 


Bleagh....


So I fired up an xterm for the only general-purpose computer left at
home that didn't get the BIND upgrade over the weekend -- a Sun 3/60,
running SunOS 4.1.1_U1.

And the "make clean" (and other stuff, though it's only perhaps halfway
through the "make all"; I only started it about 30 minutes ago -- Sun
3/60s aren't overwhelmingly fast (any more)) works just fine there... so
I'm wondering if possibly there was a bug in FreeBSD's /bin/sh circa
2.1.0-R that I might be able to circumvent.

Here's the script (as modified with the additional "set" statements):

-------------%<-------------------------------
#!/bin/sh

set -x
set -v

# this process is necessary because make(1) puts its command line into
# the environment, and when we exec a sub-make we need these command
# line settings (like CDEBUG=-g for example) to override what we get out
# of port/$systype/Makefile.set.  therefore feed Makefile.set to this
# and it will merge things appropriately.  a cache file is maintained
# to avoid calling this script way too often.

cachefile=${1-//}
if [ -f "$cachefile" ]; then
        echo "Using $cachefile" >&2
        exec cat $cachefile
fi

case $cachefile in
//) ;;
*)   echo "Making $cachefile" >&2 ;;
esac


# expr is sensitive to LC_COLLATE settings.  We want 'C'.
LC_COLLATE=C
export LC_COLLATE

result=''
while read setting; do
        var=`expr "$setting" : "'\([A-Z0-9_]*\)="`
        val=`expr "$setting" : "'[A-Z0-9_]*=\([^']*\)'\$"`
        eval "env=`echo \\${\$var-'$val'}`"
        result="$result '$var=$env'"
done    

case $cachefile in
//) echo $result ;;
*)  echo $result > $cachefile
    exec cat $cachefile ;;
esac 

exit

------------->%-------------------------------

(Yes, I *know* I need to upgrade the machine.  It is running some rather
mission-critical workload, such as being a critical internal mail relay
& nameserver.  I've been working on lessening our dependence on the one
machine, in preparation for replacing it.  But I have a few other things
to do, too....)

Thanks in advance,
david
-- 
David Wolfskill		dhw@whistle.com		UNIX System Administrator
voice: (650) 577-7158	pager: (888) 347-0197	FAX: (650) 372-5915


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