bug#14890: Wrong hash for tzdata

[ludo@gnu.org (Ludovic Courtès)]

Andreas Enge <andreas@enge.fr> skribis:

> $ guix build tzdata --no-substitutes -S
>
> ...
> starting download of `/nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-
> tzdata2013d.tar.gz' from `http://www.iana.org/time-
> zones/repository/releases/tzdata2013d.tar.gz'...
> http://www.iana.org/.../tzdata2013d.tar.gz      100.0% of 213.8 KiB
> output path `/nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-
> tzdata2013d.tar.gz' should have sha256 hash 
> `08jzd8y2xkgd89wqrv3835pqr48yjabaczxr2rmg42zaykr11an0', instead has 
> `011v63ppr73vhjgxv00inkn5pc7z48i8lhbapkpdq3kfczq9c76d'

Hmm, works for me:

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build tzdata -S
The following file will be downloaded:
   /nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz
@ substituter-started /nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz /home/ludo/src/guix/nix/scripts/substitute-binary
downloading `/nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz' from `http://hydra.gnu.org/nar/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz'...
http://hydra.gnu.org/nar/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz	 167.1 KiB transferred@ substituter-succeeded /nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz
/nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz

$ sudo cat /nix/var/nix/substitute-binary/cache/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq 
(narinfo (version 0) (date 1374056150) (value "StorePath: /nix/store/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz\nURL: http://hydra.gnu.org/nar/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz\nCompression: bzip2\nFileHash: \nFileSize: \nNarHash: sha256:0x25a56v6j6xhmbbfl29f97ch4prfr9xsbbgw4r9p5dk9qw09wvv\nNarSize: 727152\nReferences: \nDeriver: j1c8v7bfpalq8vpk31pkazcczdgl52vq-tzdata2013d.tar.gz.drv\nSystem: x86_64-linux\n"))
--8<---------------cut here---------------end--------------->8---

> The file stored on hydra is
>    gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz
> which has been decompressed before storage and is in fact not a .tar.gz, 
> but a .tar. It is identical to the decompressed file from the iana website.

What makes you think so?  It’s a bzip2-compressed nar:

--8<---------------cut here---------------start------------->8---
$ wget -O tgz http://hydra.gnu.org/nar/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz
--2013-07-17 12:19:28--  http://hydra.gnu.org/nar/gryg2h8lp3s8cc4zgxw14yn7d0wgc9lq-tzdata2013d.tar.gz

[...]

2013-07-17 12:19:29 (171 KB/s) - ‘tgz’ saved [171109]

$ file tgz
tgz: bzip2 compressed data, block size = 900k

$ bunzip2 < tgz > nar

$ grep nix-archive nar
Binary file nar matches

$ guile -c '(use-modules (guix nar)) (call-with-input-file "nar" (lambda (p) (restore-file p ",,out")))'

$ file ,,out
,,out: POSIX tar archive (GNU)

$ guix hash ,,out
08jzd8y2xkgd89wqrv3835pqr48yjabaczxr2rmg42zaykr11an0
--8<---------------cut here---------------end--------------->8---

Could it be that there was a transient networking failure or something?

Thanks,
Ludo’.