Dear List,

I'm setting up a chroot to run my webserver in; I need only a few simple
programs from /bin and /usr/bin (cat, head, date, nc, etc..);

I used to have a script that would analyze the output of "ldd <prog>"
and produce a list of all the libs needed to run the said programs;

after I upgraded from Debian.sarge to Debian.etch it stopped working; I
can see that both the output of ldd and the structure of /lib has
changed substantially!!!

so I guess I need to understand how to read the output of ldd!
please see if you can help me:

$ uname -a
Linux kellogs 2.6.18-6-686 #1 SMP Sun Feb 10 22:11:31 UTC 2008 i686 GNU/Linux

$ ldd --version
ldd (GNU libc) 2.3.6
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.

$ ldd /bin/cat
        linux-gate.so.1 =>  (0xffffe000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7eb0000)
        /lib/ld-linux.so.2 (0xb7fe8000)

how do I read the output of ldd?

line #1 points to an empty name; why?
"locate linux-gate" returns nothing!!!

why such a deep dir structure in line #2?
I was *really* scared when I did:
$ find /lib -name libc.so.6 -exec ls -Ll {} \;
-rwxr-xr-x 1 root root 1147548 Jan 19 10:14 /lib/libc.so.6
-rw-r--r-- 1 root root 1241392 Jan 19 10:15 /lib/tls/i686/cmov/libc.so.6
-rw-r--r-- 1 root root 1245488 Jan 19 10:14 /lib/tls/libc.so.6
$
wow!!! 3 different versions of libc.so.6!!!
(I hope there was a *strong* reason for that)

line #3 has no pointer (=>)! why?

to put it simple: I need to know the list of libs from /lib and /usr/lib
that I have to mirror in /opt/www/lib and /opt/www/usr/lib in order to
/opt/www/bin/cat to run inside the chroot;

[]s and TIA,

PS: this post would fit better in linux.debian.usr but my messages to it
    are being silently dropped! and I used to post to linux.debian.user
    w/o problems! is linux.debian.user being moderated now?

-- 
Otavio Exel /<\oo/>\ oexel@economatica.com.br

In comp.os.linux.misc Otavio Exel <oexel@economatica.com.br>:
[..]
> $ ldd /bin/cat
>        linux-gate.so.1 =>  (0xffffe000)
>        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7eb0000)
>        /lib/ld-linux.so.2 (0xb7fe8000)

> how do I read the output of ldd?

> line #1 points to an empty name; why?
> "locate linux-gate" returns nothing!!!

Because it isn't there, it is not existing as file, but handled
by the kernel at a fixed memory position, iirc DSO (virtual). You
should be able to find it in /proc/self/maps if you look for
[vdso].

Good luck

[left the rest for others to answer]

-- 
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo zvpunry@urvzvat.qr | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 101: Collapsed Backbone