AW: AW: AW: AW: AW: Issue with tar (Busybox 1.20.2): unknown file type

[dietmar.schindler at manroland-web.com]

> Von: piquemal michel [mailto:michel_piquemal at yahoo.fr]
> Gesendet: Montag, 24. Juni 2013 16:09
> ...
> I did rebuilt the whole uclibc and toolchain with long file support: same result (see below
> the extended printf of stat structure): it's definitely an alignment issue.
> Could that come from some GCC optimization? I've not set any in busybox config. It seems
> default buildroot toochain build has some GGC optimizations.
>
> It really seems a related busybox issue (probably something in .config), since other own-
> applications I compiled work without issues: including those working with stat/lstat (through
> glob() for instance).

You cannot infer from a working glob() that there is no issue with [l]stat, since glob() doesn't need the mode flags for example.

> I could not upload cross-compiled uClibc on target, since if I touch the target's one in /lib
> (ram mapped), the target won't work anymore, and I can not build/flash a new firmware.
>
>
>
> # busybox_dyn tar -cf toto.tar tst
> tar: status=0 flags=1  statbuf.st_ino=117074 statbuf.st_mode=838
> tar: sizeof(statbuf.st_ino)=4   offsetof(struct stat, st_mode)=20
> device    : 0x1
> inode     : 117074
> mode      : 0x346
> nlink     : 16877
> uid       : 2
> gid       : 0
> rdev      : 0x0
> size      : 0
> blksize   : 0
> blocks    : 4096
> atime     : 796000001
> mtime     : 796000001
> ctime     : 796000001
> tar: tst: unknown file type
> tar: error exit delayed from previous errors
>
> # busybox_stat tar -cf toto.tar tst
>
> tar: status=0 flags=1  statbuf.st_ino=838 statbuf.st_mode=16877
> tar: sizeof(statbuf.st_ino)=4   offsetof(struct stat, st_mode)=20
> device    : 0x1
> inode     : 838
> mode      : 0x41ed
> nlink     : 2
> uid       : 0
> gid       : 0
> rdev      : 0x0
> size      : 0
> blksize   : 4096
> blocks    : 0
> atime     : 1372079482
> mtime     : 1371975600
> ctime     : 1371975600
> ...

To sum up the findings: The different libc versions on your development and target systems have different definitions of "struct stat"; the development system has st_mode at offset 20, whereas the target's libc places st_ino at offset 20 and st_mode behind it.
The right thing to do would be using the same or compatible versions of libc (most importantly, the header files) on both systems. If you neither dare to update the target's libc nor can find the old libc header files for use on the development system, a dirty hack would be to patch the header file containing the definition of "struct stat" so that st_mode is moved back to offset 20. (You might post "struct stat" if you're unsure how to do it.)
--
Regards,
Dietmar
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