#! /bin/sh
#
# lnkpkg
#
# Shell script to create symbolic links in a user's test release 
# area, created under the BaBar code system, to the $BFDIST/packages 
# area.  If pkgA uses include files from a package in the test area, 
# but source in pkgA itself won't be modified, then pkgA can be 
# rebuilt by adding links in the test area, e.g.:
#
#       ~user/test/pkgA -> $BFDIST/packages/pkgA/V01-00-03
#       ~user/test/include/pkgA -> $BFDIST/packages/pkgA/V01-00-03/include
#
#
# Glenn Cooper Nov 1996
# Robert Harris, Jan 13, 1997: Changed $package to $1 to link include correctly
# Robert Harris, Jan 13, 1997: Added error handling and diagnostic printout
# Glenn Cooper, Jan 24, 1997: Remove (slow!) call to statusrel to get cvsRel
#
# Function:
#
#   
#
#
# Options:
#   -f  ("force") Overwrite any existing links
#
# Arguments:
#   <package>  package name
#   <tag>      Optional - if present, link to this version; if 
#              not present, link to current
#
##########################################################################

USAGE="Usage:  $0 <-f> [package] [version]"

# process options

force=0

#amj:FNAL: getopts has replaced getopt as recommended usage on SGI and 
#          DECUnix. Only getopts exists in the cygnus NT system.

while getopts f c
do
  case $c in
    f) force=1;;
  esac
done
shift `expr $OPTIND - 1`

# check for correct number of arguments
if [ "$#" -gt 2 -o "$#" -lt 1 ]; then
    echo "Error: $0 requires one or two arguments:"
    echo $USAGE
    exit 2
fi

# check to see whether link already exists
if [ -r $1 ]; then
  if [ $force = 0 ]; then
    echo "Warning: links for package $1 already exist."
    echo "To replace these, use the -f option."
    exit 2
  else
    echo "Replacing links for package $1."
  fi
fi
###############################################################


# remove old links if they exist
if [ -r $1 ]; then
  rm -f $1
fi
if [ -r include/$1 ]; then
  rm -f include/$1
fi

# create the links to the specified package
if [ "$#" -eq 2 ]; then
  # link to specified version
  # first check whether there is something to link to
  if [ -d $BFDIST/packages/$1/$2 ]; then
    # create the package link...
    ln -s $BFDIST/packages/$1/$2 $1
    # then create the include link
    if [ -d $BFDIST/packages/$1/$2/$1 ]; then
      ln -s $BFDIST/packages/$1/$2/$1 include/$1
    elif [ -d $BFDIST/packages/$1/$2/include ]; then
      ln -s $BFDIST/packages/$1/$2/include include/$1
    elif [ -d $BFDIST/packages/$1/$2/src ]; then
      ln -s $BFDIST/packages/$1/$2/src include/$1
    else
      ln -s $BFDIST/packages/$1/$2 include/$1
    fi
  else
    if [ -d $BFDIST/packages/$1 ]; then
      echo Error: package $1 version $2 does not exist. Available versions are
      ls $BFDIST/packages/$1
    else
      echo Error: package $1 does not exist. The release contains
      ls $BFDIST/packages
    fi
  fi
elif [ "$#" -eq 1 ]; then
  # version isn't specified, so use current version
  if [ -r .current ]; then
    currentRel=`cat .current`
    cvsRel=`ls -ld $BFDIST/releases/$currentRel/$1 | awk -F'/' '{print $NF}'`
  else
    echo "No version specified, and can't find file .current."
    echo "Please make sure you are using $0 from the top of \c"
    echo "your test release area."
    exit 2
  fi
  if [ "$cvsRel" = "" ]; then
    echo "Error: version number for $1 in $currentRel not available"
    exit 2
  else
    echo Release $currentRel uses $1 version $cvsRel, will link to this version.
    # first create the package link...
    ln -s $BFDIST/packages/$1/$cvsRel $1
    # then create the include link
    if [ -d $BFDIST/packages/$1/$cvsRel/$1 ]; then
      ln -s $BFDIST/packages/$1/$cvsRel/$1 include/$1
    elif [ -d $BFDIST/packages/$1/$cvsRel/include ]; then
      ln -s $BFDIST/packages/$1/$cvsRel/include include/$1
    elif [ -d $BFDIST/packages/$1/$cvsRel/src ]; then
      ln -s $BFDIST/packages/$1/$cvsRel/src include/$1
    else
      ln -s $BFDIST/packages/$1/$cvsRel include/$1
    fi
  fi
fi