Getting a list of dependencies which have to be installed ?

[Eric Schuele]

On 12/14/2006 12:10, Frank Staals wrote:
> Hey...,
> 
> Is there a utility to display the dependencies of a port which have yet 
> to be installed ? I know you can get a complete dependency list on 
> freebsd.org/ports , pkg_info -r or just looking in the files in the 
> ports dir. But is there a command to display only the dependencies which 
> haven't been installed on your system yet ? I also looked at pkg_add -n 
> but it immediately starts fetching the packages needed. I don't want to 
> start downloading the complete package just because I want a list of 
> ports I haven't installed yet.
> 
> Or is the only way making a diff between the pkg_info -r output and your 
> pkg_info -a ? If so : Is there a way to tell pkg_info when using the -r 
> flag on a not-yet-installed-port to only get a list of the dependencies 
> instead of downloading the complete package ? Or is there just an other 
> utility which can display this information which I'm not aware of ?
> 
> Thanks in advance,
> 

I needed this functionality, so I wrote a script... and sent it to the 
list for thoughts and opinions.  After a few folks chipped in... this is 
what we had.

Try the following (mind any wrapping):
#! /bin/sh

# Script to determine the differences between what is necessary for
# a port, and what is already present on the local machine.

awkprgt='{
         count = 0
         pkgs = ""
         for(i=5; i<=NF-2; i++) {
           pkg = $i

           # the "if" is here to hack it around when you get:
           # This port requires package(s) "" to build.
           if (pkg != "\"\"") {
             if (index(pkg, "\"") == 1)
               {pkg = substr(pkg, 2, length(pkg)-1)}
             if (index(pkg, "\"") > 1)
               {pkg = substr(pkg, 1, length(pkg)-1)}

             if ( system("pkg_info -e " pkg) == 1) {
               pkgs = pkgs " " pkg
               count++
             }
           }
         }

         if ( count ) {
           printf "You need the following %d (%typ) perequisites:", count
           print pkgs
         }
         else {
           print "All (%typ) prerequisites are present."
         }

       }
       END {
         # triggered, eg., by audio/artswrapper (on my box, at least)
         if( ! FNR) {
           print "Bogus (empty) %s dependency information"
         }
       }
'

awkit() {
         # Resolve "%s"-s via sed is a blunt hack
         # but good enough here and thus we don't have
         # to care about the number of occurrences
         awk "`echo "$awkprgt" | sed s/%typ/$1/g`"
}


make pretty-print-build-depends-list | awkit build

make pretty-print-run-depends-list | awkit run

### End Script

HTH.  I use it all the time.

-- 
Regards,
Eric