[M3devel] moving versions into simple text file (sh?)

[Roland Illig]

Jay schrieb:
> I'd like to (finally) move the default versions out into a simple file.
> 
> Given:
> 
> jbook15:/dev2/cm3/scripts jay$ cat version
> CM3VERSION d5.7.0
> CM3VERSIONNUM 050700
> CM3LASTCHANGED 2008-03-16
> 
> Is there any chance this is Posix/Solaris compliant?
> 
> get_version() {
>   if [ -n "$(eval echo \$$1)" ] ; then
>     return
>   fi
>   eval "$1=\"$(echo $(grep "$1 " $root/scripts/version | awk '{print 
> $2}'))\""
> }

Solaris' /bin/sh doesn't know the $(...) operator. Why do you need "eval 
echo" at all? Better use this:

# usage: get_version VARNAME
get_version() {
   eval "gv__set=\${$1+set}"
   if [ "$gv__set" != "set" ]; then
     gv__value=`awk '$1 == "'"$1"'" { print $2 }' $root/scripts/version`
     eval "$1=\$gv__value"
   fi
}

$ /bin/sh
$ . ./get_version.sh
$ set -x

$ get_version CM3VERSION
+ get_version CM3VERSION
+ eval __set=${CM3VERSION+set}
__set=
+ [  != set ]
+ awk $1 == "CM3VERSION" { print $2 } version
value=d5.7.0
+ eval CM3VERSION=$value
CM3VERSION=d5.7.0

$ get_version CM3VERSION
+ get_version CM3VERSION
+ eval __set=${CM3VERSION+set}
__set=set
+ [ set != set ]

Roland