packagedeps

#!/bin/sh

#+
#  Name:
#     packagedeps

#  Purpose:
#     Report all the packages that a package depends on, given the
#     package name.

#  Description:
#     Uses the "echodeps" command to obtain a list of all the packages
#     that the named package depends on, it then goes on to get the
#     packages that these packages depend on and so on until all
#     dependent packages have been identified. These are then listed. 
#     If no packages are required then a message:
#
#        "Package $package has no known dependencies"
#     
#     is reported. Note this must be run from the "source" directory.
#     The results of the dependency check are also returned in the
#     file: "$1".depends.

#  Type of Module:
#     Shell script.

#  Copyright:
#     Copyright (C) 2003 Central Laboratory of the Research Councils

#  Authors:
#     PWD: P.W. Draper (Starlink, Durham University)
#     {enter_new_authors_here}

#  History:
#     30-SEP-2003 (PWD):
#        Original version.
#     {enter_further_changes_here}

#  Bugs:
#     {note_any_bugs_here}

#-

if test "$1" = ""; then 
   echo "Usage: ./scripts/packagedeps package"
   exit
fi

#  See if a properties file exists for this package, and if it also
#  contains a "jar.class.path" property.

package=$1
properties=${package}/.properties

if test ! -f $properties; then
   echo "Package $package has no known dependencies"
   exit
fi

jarpath=`grep 'jar\.class\.path=' $properties`

if test -z "$jarpath"; then
   echo "Package $package has no known dependencies"
   exit
fi

#  Dodgy algorithm as we don't have hashed arrays so uniqueness
#  is hard to establish. Keep two files -- one has the list of
#  dependencies from last time and one is appended to by all the
#  dependencies of the currently known packages. Keep doing this until
#  both these files have the same content (when passed through uniq).

dependsfile=${package}.depends
lastdependsfile=${package}.last

#  Get dependencies of the primary package.
./scripts/echodeps $properties > $dependsfile

#  The dependencies last time list is initially empty.
if test -f $lastdependsfile; then
   rm $lastdependsfile
fi
touch $lastdependsfile

#  Compare the two dependency files until they are the same.
until cmp -s $lastdependsfile $dependsfile; do

   cp $dependsfile $lastdependsfile

   #  Look over the current packages getting their dependencies.
   for f in `cat $lastdependsfile`; do
      if test -f $f/.properties; then
         ./scripts/echodeps $f/.properties >> $dependsfile
      fi
   done
  
   # Make all dependencies unique.
   cat $dependsfile | sort | uniq > tmp.depends
   mv tmp.depends $dependsfile
done

#  Echo the dependencies 
cat $dependsfile
rm $lastdependsfile
exit