#!/bin/bash

# Auto-generate requirements for executables (both ELF and a.out) and library
# sonames, script interpreters, and perl modules.
#

ulimit -c 0

_OBJDUMP=$1
shift
_LIBPATH=$1
shift
_RPM_BUILD_ROOT=$1
shift


#
# --- Set needed to 0 for traditional find-requires behavior.
needed=0
if [ X"$1" = Xldd ]; then
    needed=0
elif [ X"$1" = Xobjdump ]; then
    needed=1
fi

#
# --- Grab the file manifest and classify files.
filelist=`sed "s/['\"]/\\\&/g"`
exelist=`echo $filelist | xargs -r file | egrep -v ":.* (commands|script) " | \
	grep ":.*executable" | cut -d: -f1`
scriptlist=`echo $filelist | xargs -r file | \
	egrep ":.* (commands|script) " | cut -d: -f1`
liblist=`echo $filelist | xargs -r file | \
	grep ":.*shared object" | cut -d : -f1`

interplist=
perllist=
pythonlist=
tcllist=

#
# --- Alpha does not mark 64bit dependencies
case `uname -m` in
  alpha*)	mark64="" ;;
  *)		mark64="()(64bit)" ;;
esac

if [ "$needed" -eq 0 ]; then
#
# --- Executable dependency sonames.
ff=$(for i in `find $_LIBPATH $_RPM_BUILD_ROOT 2>/dev/null`; do
file $i 2>/dev/null | grep 'shared object' >/dev/null 2>/dev/null  && echo $i
done)
ff_sonames=$(for i in $ff; do
soname=`$_OBJDUMP -p $i | grep SONAME | awk '{print $2}'`
echo "$i:$soname"
done)


dumped=
not_dumped=$exelist
full_names="yes"
while [ -n "$not_dumped" ]; do
new_requires=  
for f in $not_dumped; do
	dumped="`basename $f` $dumped"
	if [ "$full_names" != "yes" ]; then

		similar_named=`find $_LIBPATH $_RPM_BUILD_ROOT -name "$f*"`
		for i in $similar_named; do
			soname=`$_OBJDUMP -p $i | grep SONAME | awk '{print $2}'`
			if [ "$soname" == "$f" ] ; then
				f=$i
				break;
			fi
		done
		[ -r "$f" ] || for i in $ff_sonames;  do
			soname=`echo $i | gawk -F':' '{print $2}'`
			if [ "$soname" == "$f" ]; then
				f=`echo $i | gawk -F':' '{print $1}'`
				break
			fi
		done
		[ -r "$f" ] || continue
	else
   		[ -r $f -a -x $f ] || continue
	fi
    lib64=`if file -L $f 2>/dev/null | \
	grep "ELF 64-bit" >/dev/null; then echo "$mark64"; fi`
    new_requires_add=$(${_OBJDUMP} --private-headers $f | awk '/NEEDED/ {printf "%s\n",$2}' | awk '{
	if ($1 !~ /libNoVersion.so/ && $1 !~ /4[um]lib.so/ && $1 !~ /libredhat-kernel.so/) {
	    gsub(/'\''"/,"\\&",$1);
	    printf "%s'$lib64'\n", $1
	}
    }')
	new_requires="$new_requires_add $new_requires"
  done 
new_requires=`echo $new_requires | xargs -r -n 1 basename | sort -u`
requires="$new_requires $requires" 
requires=`for f in $requires; do echo "$f"; done | sort -u`
not_dumped=
for f in $new_requires; do
	if ! echo $dumped | grep "$f" >/dev/null 2>/dev/null; then
		not_dumped="$f $not_dumped" 
	fi
done
full_names=
done
for f in $requires; do
echo $f
done
requires=
#
# --- Library dependency sonames.

not_dumped=$liblist
full_names="yes"
while [ -n "$not_dumped" ]; do
new_requires=  
  for f in $not_dumped; do
    
	dumped="`basename $f` $dumped"
	if [ "$full_names" != "yes" ]; then

		similar_named=`find $_LIBPATH $_RPM_BUILD_ROOT -name "$f*"`
		for i in $similar_named; do
			soname=`$_OBJDUMP -p $i | grep SONAME | awk '{print $2}'`
			if [ "$soname" == "$f" ] ; then
				f=$i
				break;
			fi
		done
		[ -r "$f" ] || for i in $ff_sonames;  do
			soname=`echo $i | gawk -F':' '{print $2}'`
			if [ "$soname" == "$f" ]; then
				f=`echo $i | gawk -F':' '{print $1}'`
				break
			fi
		done
		[ -r "$f" ] || continue
	else
   		[ -r "$f" ] || continue
	fi
    lib64=`if file -L $f 2>/dev/null | \
	grep "ELF 64-bit" >/dev/null; then echo "$mark64"; fi`
    new_requires_add=$(${_OBJDUMP} $f --private-headers | awk '/NEEDED/ {printf "%s\n",$2}' | awk '{
	if ($1 !~ /libNoVersion.so/ && $1 !~ /4[um]lib.so/ && $1 !~ /libredhat-kernel.so/) {
	    gsub(/'\''"/,"\\&",$1);
	    printf "%s'$lib64'\n", $1
	}
    }')
	new_requires="$new_requires_add $new_requires"
  done 


new_requires=`echo $new_requires | xargs -r -n 1 basename | sort -u`
requires="$new_requires $requires" 
requires=`for f in $requires; do echo "$f"; done | sort -u`
not_dumped=
for f in $new_requires; do
	if ! echo $dumped | grep "$f"  >/dev/null 2>/dev/null ; then
		not_dumped="$f $not_dumped" 
	fi
done
full_names=
done
for f in $requires; do
	echo $f
done
fi

#
# --- Script interpreters.
for f in $scriptlist; do
    [ -r $f -a -x $f ] || continue
    interp=`head -1 $f | sed -e 's/^\#\![ 	]*//' | cut -d" " -f1`
    interplist="$interplist $interp"
    case $interp in
    */perl)	perllist="$perllist $f" ;;
    esac
done
[ -n "$interplist" ] && { echo "$interplist" | tr '[:blank:]' \\n | sort -u ; }

#
# --- Add perl module files to perllist.
for f in $filelist; do
    [ -r $f -a "${f%.pm}" != "${f}" ] && perllist="$perllist $f"
done

#
# --- Weak symbol versions (from glibc).
[ -n "$mark64" ] && mark64="(64bit)"
for f in $liblist $exelist ; do
    [ -r $f ] || continue
    lib64=`if file -L $f 2>/dev/null | \
	grep "ELF 64-bit" >/dev/null; then echo "$mark64"; fi`
    ${_OBJDUMP} -p $f | awk 'BEGIN { START=0; LIBNAME=""; needed='$needed'; }
	/^$/ { START=0; }
	/^Dynamic Section:$/ { START=1; }
	(START==1) && /NEEDED/ {
	    if (needed) { print $2 ; }
	}
	/^Version References:$/ { START=2; }
	(START==2) && /required from/ {
	    sub(/:/, "", $3);
	    LIBNAME=$3;
	}
	(START==2) && (LIBNAME!="") && ($4!="") && (($4~/^GLIBC_*/) || ($4~/^GCC_*/)) {
	    print LIBNAME "(" $4 ")'$lib64'";
	}
    '
done | sort -u

#
# --- Perl modules.
[ -x /usr/lib/rpm/perl.req -a -n "$perllist" ] && \
    echo $perllist | tr '[:blank:]' \\n | /usr/lib/rpm/perl.req | sort -u

#
# --- Python modules.
[ -x /usr/lib/rpm/python.req -a -n "$pythonlist" ] && \
    echo $pythonlist | tr '[:blank:]' \\n | /usr/lib/rpm/python.req | sort -u

#
# --- Tcl modules.
[ -x /usr/lib/rpm/tcl.req -a -n "$tcllist" ] && \
    echo $tcllist | tr '[:blank:]' \\n | /usr/lib/rpm/tcl.req | sort -u

exit 0