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Re: [Jailkit-users] libz?

From: email builder
Subject: Re: [Jailkit-users] libz?
Date: Thu, 19 Jan 2012 20:38:01 -0800 (PST)

>>  Hmm.  I zipped up a random README file and used less on it.  When I did

>>  that from a normal (non-jailed) account, it tells me:
>>  Archive:  README.zip   3925 bytes   1 file
>>  -rw-r--r--  2.3 unx     9564 tx defN 21-Dec-11 23:55 README
>>  1 file, 9564 bytes uncompressed, 3781 bytes compressed:  60.5%
>>  But when I su to a jailed user (or ssh to a jailed user), I get this:
>>  WARNING: terminal is not fully functional
>>  "README.zip" may be a binary file.  See it anyway?
>>  I hit "y" and then I see lots of e.g. 
> "<F5><CE><9A>-<B01>" which
>>  goes on randomly for a few pages.
>>  I'm not sure if that's just a terminal issue or if less/libz
>>  is malfunctioning.  (I tend to think it might just be the
>>  account's terminal?)
> no this looks to like the 'less' inside the jail is either a
> different less, or it is missing the zip functionality or library
> (I don't know what it needs to read zip files).

OK thanks. But if there's some lib missing for it to work,
shouldn't jk_init or jk_update catch it?

>>  *Something* had to require it to make jk_init put it into
>>  the jail, right?  What process does jk_init use to determine
>>  that?
> jk_init and jk_cp use ldd on all the binaries. However, yu cannot see 
> all libraries with ldd, libraries that are opened with ldopen() cannot 
> be detected that way.

Hmm, ok, well it seems like there's nothing I can
do to see what the problem is/was.

>>  Normally, does jk_update *remove* unused libraries?
> nope, it only detects differences between the real system and the jail
>>  Or is it normal to have a situation like this with what
>>  could be an orphaned library in the jail?  (Although it
>>  seems we don't know for sure that it should not be in
>>  the jail)
> I normally have my jails all configured in jk_init.ini, so after a major 
> operating system update I can recreate the jail from scratch using a 
> single jk_init command (and then copy the data back into the jail.

Maybe I'll try to figure out how I can do that myself.  I would 
suggest this as a good FAQ on the jailkit website.

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