GNU bug report logs - #61722
(guix cpio) produces corrupted archives when there are non-ASCII filenames

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Subject: bug#61722: closed (Re: bug#61722: (guix cpio) produces corrupted
 archives when there are non-ASCII filenames)
Date: Sat, 25 Feb 2023 19:53:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#61722: (guix cpio) produces corrupted archives when there are non-ASCII filenames

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 61722 <at> debbugs.gnu.org.

-- 
61722: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=61722
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: 61722-done <at> debbugs.gnu.org
Cc: Josselin Poiret <dev <at> jpoiret.xyz>, Christopher Baines <mail <at> cbaines.net>,
 Simon Tournier <zimon.toutoune <at> gmail.com>, mhw <at> netris.org,
 Ludovic Courtès <ludo <at> gnu.org>,
 Tobias Geerinckx-Rice <me <at> tobias.gr>, Ricardo Wurmus <rekado <at> elephly.net>,
 Mathieu Othacehe <othacehe <at> gnu.org>
Subject: Re: bug#61722: (guix cpio) produces corrupted archives when there
 are non-ASCII filenames
Date: Sat, 25 Feb 2023 14:52:15 -0500

Hi,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:

> Fixes <https://issues.guix.gnu.org/61722>.
>
> * guix/cpio.scm (file->cpio-header): Compute the file name length in bytes rather than in
> characters.
> (file->cpio-header*, special-file->cpio-header*): Likewise.
> (write-cpio-archive): Likewise, and write the file name as UTF-8 bytes, not
> textually, to avoid encoding it as ISO-8859-1.

Pushed to master.

Closing.

-- 
Thanks,
Maxim

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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: bug-guix <bug-guix <at> gnu.org>
Subject: (guix cpio) produces corrupted archives when there are non-ASCII
 filenames
Date: Wed, 22 Feb 2023 22:14:26 -0500

Hi,

It appears that the code we have to generate CPIO archives doesn't
handle the presence of non-ASCII characters in the file names of files
to be archived well:

First, to make rpm usable on a Guix System:

--8<---------------cut here---------------start------------->8---
# mkdir /var/lib/rpm
# chown root:users /var/lib/rpm
# chmod g+rw /var/lib/rpm
--8<---------------cut here---------------end--------------->8---

Then, produce a problematic CPIO via 'guix pack -f rpm', which uses
(guix cpio):

--8<---------------cut here---------------start------------->8---
$ rpm_archive=$(guix pack -R -C none -f rpm nss-certs)
--8<---------------cut here---------------end--------------->8---

Notice that it cannot be installed:
--8<---------------cut here---------------start------------->8---
$ mkdir /tmp/nss-certs
# rpm --prefix=/tmp/nss-certs -i $rpm_archive
error: unpacking of archive failed: cpio: Bad magic
error: nss-certs-3.81-0.x86_64: install failed
--8<---------------cut here---------------end--------------->8---

Let's now inspect the cpio itself.

--8<---------------cut here---------------start------------->8---
$ guix shell rpm cpio
[env]$ rpm2cpio $rpm_archive > nss-certs.cpio
[env]$ cpio -t < nss-certs.cpio |& grep -B3 junk
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/9482e63a.0
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/9846683b.0
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/988a38cb.0
cpio: warning: skipped 248 bytes of junk
--
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/Microsoft_RSA_Root_Certificate_Authority_2017.pem
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/NAVER_Global_Root_Certification_Authority.pem
./gnu/store/1klwvqm3njp070h982ydcix1gzf2zmdl-nss-certs-3.81/etc/ssl/certs/NetLock_Arany_=Class_Gold=_Főtanúsítvány.
cpio: warning: skipped 4 bytes of junk
--8<---------------cut here---------------end--------------->8---

I haven't yet pin-pointed what the problem is.

I could do with extra eyes :-).

-- 
Thanks,
Maxim

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