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#!/bin/sh -ef
export LC_ALL=C

rpmsoname()
{
	rpm -qp --qf '[%{PROVIDES}\n]' "$1" >prov || return
	grep -oE '^lib[^/()]+[.]so\>[^/()]*' prov >sonames || return 0

	# Files map to themselves; symbolic links cause a headache.
	# Sample file entry:	perl5.8.7	/usr/bin/perl5.8.7
	# Sample link entry:	libperl.so.5.8	/usr/lib/libperl.so.5.8	libperl.so.5.8.7
	rpm -qp --qf '[%{BASENAMES}\t%{FILENAMES}\t%{FILELINKTOS}\n]' "$1" >list
	awk -F'\t' '$NF==""{print$1"\t"$2}$NF{print>"/dev/fd/3"}' list >files 3>links

	# Make links absolute.  Sample diff:
	# 	-perl5	/usr/bin/perl5	perl5.8.7
	# 	+perl5	/usr/bin/perl5	/usr/bin/perl5.8.7
	perl -MFile::Spec::Functions=rel2abs -MFile::Basename=dirname -ni -aF'\t' -le \
		'$F[-1]=rel2abs$F[-1],dirname$F[-2];{$F[-1]=~s$/[^/]+/\.\./$/$&&redo}$,="\t",print@F' links

	# Now follow links (i.e. a->b,b->c => a->c,b->c). Sample diff:
	#	-libpri.so       /usr/lib/libpri.so      /usr/lib/libpri.so.1
	#	+libpri.so       /usr/lib/libpri.so      /usr/lib/libpri.so.1.0
	#	 libpri.so.1     /usr/lib/libpri.so.1    /usr/lib/libpri.so.1.0
	while :; do
		sort -t$'\t' -o links1 -k3,3 links
		sort -t$'\t' -o links2 -k2,2 links
		join -t$'\t' -13 -22 -o '1.1 1.2 2.3' links1 links2 >elinks
		[ -s elinks ] || break
		sort -t$'\t' -o links -u -k1,2 elinks links
	done

	# Join links against files.
	sort -t$'\t' -o files -k2 files
	sort -t$'\t' -o links -k3 links
	join -t$'\t' -12 -23 -o '2.1 2.3' files links >filelinks
	join -t$'\t' -12 -23 -o '2.1 2.3' -v2 files links >externlinks

	# Now ready to join sonames on files+filelinks.
	sort -o sonames -u sonames
	sort -o map -u files filelinks
	join -t$'\t' -j 1 -o '2.1 2.2' sonames map >mapped
	join -t$'\t' -j 1 -o 0 -v1 sonames map >unmapped

	# The results.
	awk -F'\t' '{print$2"\t"$1}' mapped |sort -u

	# Now warnings.
	join -t$'\t' -j 1 -o '1.1 1.2 2.2' mapped mapped |awk -F'\t' \
		'$2!=$3{print$1"\t"$2}' >multimapped
	if [ -s multimapped ]; then
		echo "warning: ${1##*/}: multimapped sonames:"
		sort -u multimapped
	fi >&2
	if [ -s unmapped ]; then
		echo "warning: ${1##*/}: unmapped sonames:"
		# TODO: extra analysis based on externlinks
		sort -u unmapped
	fi >&2
}

. rpmargs -c rpmsoname "$@"

: <<'__EOF__'

=head1	NAME

rpmsoname - list files that provide sonames in RPM package(s)

=head1	SYNOPSIS

B<rpmsoname> [B<-h>] [I<options>] [I<FILE>...] [I<DIR>...]

=head1	DESCRIPTION

B<rpmsoname> produces two-column output (typically one line per each soname).
Column one contains file path; column two contains corresponding soname.
When processing a directory, an additional column is prepended to the
output, which is typically RPM file basename.

Note that the name B<rpmsoname> is probably a misnomer: the script does not
deal with ELF C<DT_SONAME> entries.  What it does is try to map soname-like
entries from RPM C<PROVIDES> list to regular files within the very same RPM
package (using C<BASENAMES>, C<FILENAMES>, and C<FILELINKTOS> lists from RPM
header).

=head1	OPTIONS

Options and arguments manage a set of RPM packages to be processed;
they are those of rpmargs(1).

=head1	AUTHOR

Written by Alexey Tourbin <at@altlinux.org>.

=head1	COPYING

Copyright (c) 2006 Alexey Tourbin, ALT Linux Team.

This is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.

=head1	SEE ALSO

rpmargs(1)

=cut

__EOF__