untaring into ext2fs ./dev/* entries

[Matthias Apitz]

El día Monday, January 20, 2014 a las 11:40:03AM +0100, Matthias Apitz escribió:

> 
> Hello,
> 
> I'm using an OpenSource Linux based cellphone. The software is provided
> as a tar-archive which must be unpacked into an ext2fs on a microSD;
> I do not have any Linux box and want to do this on my FreeBSD
> (10-CURRENT) laptop;
> 
> I can mount the ext2fs fine and when I say:
> 
> # cd /mnt
> # gtar --numeric-owner -xpzf shr-image-om-gta02.tar.gz 
> 
> it gives errors like this example for all special files:
> 
> gtar: ./dev/hda7: Cannot utime: Operation not supported
> gtar: ./dev/hda7: Cannot change ownership to uid 0, gid 6: Operation not supported
> gtar: ./dev/hda7: Cannot change mode to rw-rw----: Operation not supported

...

This issue is clearly related to ext2fs;

in UFS all is fine:

# mkdir dev
# mknod dev/hda7 b 3 7 root:mail
# chmod 0660 dev/hda7
# ls -l dev/hda7 
brw-rw----  1 root  mail  0x307 Jan 20 13:25 dev/hda7

in ext2fs mounted as /mnt it does not work:

# mkdir /mnt/dev
# mknod /mnt/dev/hda7 b 3 7 root:mail
mknod: setting ownership on /mnt/dev/hda7: Operation not supported
# chmod 0660 /mnt/dev/hda7
chmod: /mnt/dev/hda7: Operation not supported
# ls -l /mnt/dev/hda7
brw-r--r--  1 root  wheel  0x307 Jan 20 13:26 /mnt/dev/hda7

Is this a bug in ext2fs or a feature?

	matthias

-- 
Sent from my FreeBSD netbook

Matthias Apitz, <guru at unixarea.de>, http://www.unixarea.de/ f: +49-170-4527211
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5