1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
290 lines
8.6 KiB
Tcl
Executable File
290 lines
8.6 KiB
Tcl
Executable File
#!/bin/sh
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# tcl magic \
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exec tclsh $0 $*
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################################################################################
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# Copyright (C) 1997
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# Michael Smith. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the author nor the names of any co-contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY Michael Smith AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL Michael Smith OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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################################################################################
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#
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# LibraryReport; produce a list of shared libraries on the system, and a list of
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# all executables that use them.
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#
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################################################################################
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#
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# Stage 1 looks for shared libraries; the output of 'ldconfig -r' is examined
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# for hints as to where to look for libraries (but not trusted as a complete
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# list).
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#
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# These libraries each get an entry in the global 'Libs()' array.
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#
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# Stage 2 walks the entire system directory heirachy looking for executable
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# files, applies 'ldd' to them and attempts to determine which libraries are
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# used. The path of the executable is then added to the 'Libs()' array
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# for each library used.
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#
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# Stage 3 reports on the day's findings.
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#
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################################################################################
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#
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# $FreeBSD$
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#
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#########################################################################################
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# findLibs
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#
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# Ask ldconfig where it thinks libraries are to be found. Go look for them, and
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# add an element to 'Libs' for everything that looks like a library.
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#
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proc findLibs {} {
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global Libs stats verbose;
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# Older ldconfigs return a junk value when asked for a report
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if {[catch {set liblist [exec ldconfig -r]} err]} { # get ldconfig output
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puts stderr "ldconfig returned nonzero, persevering.";
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set liblist $err; # there's junk in this
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}
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# remove hintsfile name, convert to list
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set liblist [lrange [split $liblist "\n"] 1 end];
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set libdirs ""; # no directories yet
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foreach line $liblist {
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# parse ldconfig output
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if {[scan $line "%s => %s" junk libname] == 2} {
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# find directory name
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set libdir [file dirname $libname];
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# have we got this one already?
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if {[lsearch -exact $libdirs $libdir] == -1} {
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lappend libdirs $libdir;
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}
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} else {
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puts stderr "Unparseable ldconfig output line :";
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puts stderr $line;
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}
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}
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# libdirs is now a list of directories that we might find libraries in
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foreach dir $libdirs {
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# get the names of anything that looks like a library
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set libnames [glob -nocomplain "$dir/lib*.so.*"]
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foreach lib $libnames {
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set type [file type $lib]; # what is it?
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switch $type {
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file { # looks like a library
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# may have already been referenced by a symlink
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if {![info exists Libs($lib)]} {
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set Libs($lib) ""; # add it to our list
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if {$verbose} {puts "+ $lib";}
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}
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}
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link { # symlink; probably to another library
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# If the readlink fails, the symlink is stale
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if {[catch {set ldest [file readlink $lib]}]} {
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puts stderr "Symbolic link points to nothing : $lib";
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} else {
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# may have already been referenced by another symlink
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if {![info exists Libs($lib)]} {
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set Libs($lib) ""; # add it to our list
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if {$verbose} {puts "+ $lib";}
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}
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# list the symlink as a consumer of this library
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lappend Libs($ldest) "($lib)";
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if {$verbose} {puts "-> $ldest";}
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}
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}
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}
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}
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}
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set stats(libs) [llength [array names Libs]];
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}
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################################################################################
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# findLibUsers
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#
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# Look in the directory (dir) for executables. If we find any, call
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# examineExecutable to see if it uses any shared libraries. Call ourselves
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# on any directories we find.
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#
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# Note that the use of "*" as a glob pattern means we miss directories and
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# executables starting with '.'. This is a Feature.
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#
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proc findLibUsers {dir} {
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global stats verbose;
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if {[catch {
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set ents [glob -nocomplain "$dir/*"];
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} msg]} {
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if {$msg == ""} {
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set msg "permission denied";
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}
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puts stderr "Can't search under '$dir' : $msg";
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return ;
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}
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if {$verbose} {puts "===>> $dir";}
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incr stats(dirs);
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# files?
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foreach f $ents {
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# executable?
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if {[file executable $f]} {
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# really a file?
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if {[file isfile $f]} {
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incr stats(files);
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examineExecutable $f;
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}
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}
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}
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# subdirs?
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foreach f $ents {
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# maybe a directory with more files?
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# don't use 'file isdirectory' because that follows symlinks
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if {[catch {set type [file type $f]}]} {
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continue ; # may not be able to stat
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}
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if {$type == "directory"} {
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findLibUsers $f;
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}
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}
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}
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################################################################################
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# examineExecutable
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#
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# Look at (fname) and see if ldd thinks it references any shared libraries.
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# If it does, update Libs with the information.
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#
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proc examineExecutable {fname} {
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global Libs stats verbose;
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# ask Mr. Ldd.
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if {[catch {set result [exec ldd $fname]} msg]} {
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return ; # not dynamic
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}
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if {$verbose} {puts -nonewline "$fname : ";}
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incr stats(execs);
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# For a non-shared executable, we get a single-line error message.
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# For a shared executable, we get a heading line, so in either case
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# we can discard the first line and any subsequent lines are libraries
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# that are required.
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set llist [lrange [split $result "\n"] 1 end];
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set uses "";
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foreach line $llist {
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if {[scan $line "%s => %s %s" junk1 lib junk2] == 3} {
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if {$lib == "not"} { # "not found" error
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set mlname [string range $junk1 2 end];
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puts stderr "$fname : library '$mlname' not known.";
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} else {
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lappend Libs($lib) $fname;
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lappend uses $lib;
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}
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} else {
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puts stderr "Unparseable ldd output line :";
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puts stderr $line;
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}
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}
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if {$verbose} {puts "$uses";}
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}
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################################################################################
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# emitLibDetails
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#
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# Emit a listing of libraries and the executables that use them.
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#
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proc emitLibDetails {} {
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global Libs;
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# divide into used/unused
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set used "";
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set unused "";
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foreach lib [array names Libs] {
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if {$Libs($lib) == ""} {
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lappend unused $lib;
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} else {
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lappend used $lib;
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}
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}
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# emit used list
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puts "== Current Shared Libraries ==================================================";
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foreach lib [lsort $used] {
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# sort executable names
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set users [lsort $Libs($lib)];
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puts [format "%-30s %s" $lib $users];
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}
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# emit unused
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puts "== Stale Shared Libraries ====================================================";
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foreach lib [lsort $unused] {
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# sort executable names
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set users [lsort $Libs($lib)];
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puts [format "%-30s %s" $lib $users];
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}
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}
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################################################################################
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# Run the whole shebang
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#
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proc main {} {
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global stats verbose argv;
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set verbose 0;
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foreach arg $argv {
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switch -- $arg {
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-v {
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set verbose 1;
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}
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default {
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puts stderr "Unknown option '$arg'.";
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exit ;
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}
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}
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}
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set stats(libs) 0;
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set stats(dirs) 0;
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set stats(files) 0;
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set stats(execs) 0
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findLibs;
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findLibUsers "/";
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emitLibDetails;
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puts [format "Searched %d directories, %d executables (%d dynamic) for %d libraries." \
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$stats(dirs) $stats(files) $stats(execs) $stats(libs)];
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}
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################################################################################
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main;
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