File mono-find-requires of Package mono-core

#!/usr/bin/bash
#
# mono-find-requires
#
# Authors:
#       Ben Maurer (bmaurer@ximian.com)
#
# (C) 2005 Novell (http://www.novell.com)
#
# Args: builddir buildroot libdir

IFS=$'\n'
filelist=($(grep -Ev '/usr/doc/|/usr/share/doc/'))
monolist=($(printf "%s\n" "${filelist[@]}" | grep -E "\\.(exe|dll)\$"))

# If monodis is in the package being installed, use that one
# This is to support building mono
build_bindir="$2/usr/bin"
build_libdir="$2$3"

if [ -x $build_bindir/monodis ]; then
    monodis="$build_bindir/monodis"
    export LD_LIBRARY_PATH=$build_libdir${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
elif [ -x /usr/bin/monodis ]; then
    monodis="/usr/bin/monodis"
else
    exit 0;
fi

export MONO_SHARED_DIR=$1

REQUIRES=$(
	for i in "${monolist[@]}"; do
		($monodis --assemblyref $i | awk '
			BEGIN { START=0; LIBNAME=""; VERSION=""; }
			(START==0) && /^[0-9]+: Version=/ {
				START=1;
				sub(/Version=/, "", $2);
				VERSION=$2
			}
	
			(START==1) && /^\tName=/ {
				sub(/Name=/, "", $1);
				LIBNAME=$1
				# Allow rpm deps to be resolved for 1.0 profile version
				if (VERSION=="1.0.3300.0")
					OP=">="
				else
					OP="="
				print "mono(" LIBNAME ") " OP " " VERSION	
				START=0
			}
		    ') 2> /dev/null
	done
)

PROVIDES=$(
	for i in "${monolist[@]}"; do
		($monodis --assembly $i | awk '
			BEGIN { LIBNAME=""; VERSION=""; }
			/^Version:/ { VERSION=$2 }
			/^Name:/    { LIBNAME=$2 }
			END {
				if (VERSION && LIBNAME)
					print "mono(" LIBNAME ") = " VERSION
			}
		    ') 2>/dev/null
	done
)
#
# This is a little magic trick to get all REQUIRES that are not
# in PROVIDES. While RPM functions correctly when such deps exist,
# they make the metadata a bit bloated.
#

# Filter out dups from both lists
REQUIRES=$(echo "$REQUIRES" | sort | uniq)
PROVIDES=$(echo "$PROVIDES" | sort | uniq)

#
# Get a list of elements that exist in exactly one of PROVIDES or REQUIRES
#
UNIQ=$(echo "$PROVIDES
$REQUIRES" | sort | uniq -u)

#
# Of those, only chose the ones that are in REQUIRES
#
echo "$UNIQ
$REQUIRES" | sort | uniq -d