GNU bug report logs -
#36853
mklabel does not clear mdraid version 0.90 metadata
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bug-parted <at> gnu.org
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bug#36853
; Package
parted
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(Tue, 30 Jul 2019 09:37:02 GMT)
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Michael Hudson-Doyle <michael.hudson <at> canonical.com>
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(Tue, 30 Jul 2019 09:37:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
[Message part 1 (text/plain, inline)]
Chasing down a bug report
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1828558 where
installing over a device previously used in a RAID array, I found that
parted's mklabel does not erase mdraid metadata 0.90 metadata (and only
that version). Here's my test script
#!/bin/bash
set -xeu
parted --version
rm -f image.img
truncate -s 1G image.img
n=$(uuidgen | cut -d- -f1)
dev="$(losetup -Pf --show image.img)"
mdadm --create --metadata 0.90 --force --level 1 -n 1 --assume-clean
/dev/md/$n $dev
mdadm --stop /dev/md/$n
losetup -d $dev
parted --script --align optimal image.img -- mklabel msdos
wipefs image.img
and here's the output on my system:
+ parted --version
parted (GNU parted) 3.2
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by <
http://git.debian.org/?p=parted/parted.git;a=blob_plain;f=AUTHORS>.
+ rm -f image.img
+ truncate -s 1G image.img
++ uuidgen
++ cut -d- -f1
+ n=e0c43267
++ losetup -Pf --show image.img
+ dev=/dev/loop44
+ mdadm --create --metadata 0.90 --force --level 1 -n 1 --assume-clean
/dev/md/e0c43267 /dev/loop44
mdadm: array /dev/md/e0c43267 started.
+ mdadm --stop /dev/md/e0c43267
mdadm: stopped /dev/md/e0c43267
+ losetup -d /dev/loop44
+ parted --script --align optimal image.img -- mklabel msdos
+ wipefs image.img
DEVICE OFFSET TYPE UUID
LABEL
image.img 0x3fff0000 linux_raid_member 6dbbfe69-809c-7a77-14d5-894fb9296617
image.img 0x1fe dos
Looking at ped_disk_clobber none of this is surprising: the 0.90 metadata
is somewhere between 127 and 64 kiB from the end of the device and this
isn't touched.
If this is indeed deemed a bug it could be pragmatically fixed by wiping
more from the end of the disk or more cleverly by using libblkid to locate
and zap all superblocks.
Cheers,
mwh
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"Brian C. Lane" <bcl <at> redhat.com>
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You have taken responsibility.
(Tue, 30 Jul 2019 17:30:02 GMT)
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Michael Hudson-Doyle <michael.hudson <at> canonical.com>
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bug acknowledged by developer.
(Tue, 30 Jul 2019 17:30:03 GMT)
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Message #10 received at 36853-done <at> debbugs.gnu.org (full text, mbox):
On Tue, Jul 30, 2019 at 09:19:49PM +1200, Michael Hudson-Doyle wrote:
> Chasing down a bug report
> https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1828558 where
> installing over a device previously used in a RAID array, I found that
> parted's mklabel does not erase mdraid metadata 0.90 metadata (and only
> that version). Here's my test script
This is working as expected, parted tries not to touch more than it
needs to and this situation will often come up when you re-partition a
disk using the same values as a previous installation. You need to use
something like wipefs on the disk before creating the new partitions.
Thanks,
--
Brian C. Lane (PST8PDT) - weldr.io - lorax - parted
bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
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internal_control <at> debbugs.gnu.org
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(Wed, 28 Aug 2019 11:24:04 GMT)
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This bug report was last modified 4 years and 214 days ago.
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