[Freedombox-discuss] Freedombox 0.2 almost ready - please test

[Sunil Mohan Adapa]

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On Thursday 13 March 2014 01:37 AM, A. F. Cano wrote:
[...]
> [sudo] password for afc: Creating disk image Creating partitions 
> Installing MBR Creating filesystem ext4 EEEK! Something bad
> happened... Cleaning up ERROR: command failed: ['mkfs', '-t',
> 'ext4', '/dev/mapper/loop0p1']
> 
> mke2fs 1.42.9 (4-Feb-2014) Could not stat /dev/mapper/loop0p1 ---
> No such file or directory
> 
> The device apparently does not exist; did you specify it
> correctly?

I was able to build virtualbox image without the above error. For your
case, it appears that kpartx, spawned by vmdebootstrap, failed to
create devicemapper device in /dev/mapper.

One possibility is that device-mapper module is not present in the
kernel. Does /proc/misc show device-mapper? Try modprobe dm_mod.

Another possibility is that libdevmapper is incompatible with the
kernel driver, perhaps after a dist-upgrade and before rebooting (as
reported by one user[1]). If so, try rebooting into the new kernel.

To diagnose the problem try the following:

root at localhost:~# dd if=/dev/zero of=/tmp/test_image  bs=1M count=1
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00584958 s, 179 MB/s
root at localhost:~# parted -s /tmp/test_image mktable msdos
root at localhost:~# parted -s /tmp/test_image mkpart primary ext4 0 100%
Warning: The resulting partition is not properly aligned for best
performance.
root at localhost:~# kpartx -av /tmp/test_image
add map loop0p1 (254:1): 0 2047 linear /dev/loop0 1
root at localhost:~# ls /dev/mapper/loop0p1
/dev/mapper/loop0p1
root at localhost:~# dmsetup status
loop0p1: 0 2047 linear
root at localhost:~# kpartx -d /tmp/test_image
loop deleted : /dev/loop0
root at localhost:~# dmsetup status
root at localhost:~# rm /tmp/test_image

Links:

1) http://tuxera.com/forum/viewtopic.php?f=2&t=953&view=next

- -- 
Sunil
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