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gerdOffline
Post subject: cryptsetup + fstab + uuid don't work  PostPosted: 19.09.2010, 16:07



Joined: 2010-09-13
Posts: 94

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Hello,

i mount a hdd with cryptsetup to /dev/mapper/data2
blkid says then
      Code:
/dev/mapper/data2: LABEL="data" UUID="9688f835-1d32-4e1a-b66d-759b454f3a3d" TYPE="ext4"

Now my problem:
This entry in fstab works (automount works)
      Code:
/dev/mapper/data2  /media/1500 ext4 defaults,users 0 0

This entry doesn't work (and same if i use LABEL):
      Code:
UUID="9688f835-1d32-4e1a-b66d-759b454f3a3d" /media/1500 ext4 defaults,users 0 0

data2 is automounted, but to another directory (no dupe entries in fstab).
If i use
      Code:
UUID=9688f835-1d32-4e1a-b66d-759b454f3a3d /media/1500 ext4 defaults,users 0 0

i get a error popup no rights to mount and nothing is mounted.

Any ideas? Is this a bug and if yes for which program i should look for a bugreport or submit one?
 
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muchan
Post subject: RE: cryptsetup + fstab + uuid don  PostPosted: 19.09.2010, 21:08
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Joined: 2010-09-11
Posts: 468

      Quote:

Any ideas? Is this a bug and if yes for which program i should look for a bugreport or submit one?


My idea is that this is not a bug. because...
You already mounted the partition with that UUID to the device /dev/mapper/data2.
(I don't know how you did it, but I suppose /dev/mapper/data2 is device that shows
*decrypted* content of the bound partition.)
Then you want to mount /dev/mapper/data2, the decrypting device to a mountpoint
in file system /media/1500. so it works.

When you try to mount encrypted partition with the UUID directly to the mountpoint,
there is not decrypting device in the chain, so it should fail. and fails.

Well, I don't have any clue about encrypted disk. So I may be totally wrong.
 
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gerdOffline
Post subject: RE: cryptsetup + fstab + uuid don  PostPosted: 19.09.2010, 21:42



Joined: 2010-09-13
Posts: 94

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Yes, i think you are wrong.
The encrypted device has it's own UUID (and a own line in the output of blkid) and the posted UUID is the one from the decrypted device, which at this point is not mounted. There is also a entry in /dev/disk/by-uuid with this UUID, so i think it should be mountable.
Tomorrow i will try to mount it with uuid in the console and see if there is helpful output...
 
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michaaa62Offline
Post subject:   PostPosted: 20.09.2010, 01:49



Joined: 2010-09-11
Posts: 53
Location: Berlin, Germany
Status: Offline
Did you compare the output of
      Code:
blkid
with the output of
      Code:
ls -l /dev/disk/by-uuid
to crosscheck the UUIDs?
 
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gerdOffline
Post subject:   PostPosted: 20.09.2010, 09:22



Joined: 2010-09-13
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la -al /dev/mapper/
lrwxrwxrwx 1 root root data2 -> ../dm-8
(all other entries are NOT softlinks)

This fstab-entry works
      Code:
/dev/disk/by-uuid/9688f835-1d32-4e1a-b66d-759b454f3a3d /media/data ext4 defaults,users 0 0

This don't work
      Code:
UUID=9688f835-1d32-4e1a-b66d-759b454f3a3d /media/data ext4 defaults,users 0 0

I get a popup (in german, but i try to translate)
      Quote:
The volume "name" can't be mounted. You have no rights to mount the volume

BUT
mount /media/data
in a root console works!
 
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kris99Offline
Post subject:   PostPosted: 26.09.2010, 16:10



Joined: 2010-09-11
Posts: 21

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Did you enter the entry in

/etc/crypttab

      Code:
# <target name> <source device>                                          <key file>    <options>
sda8_crypt       /dev/disk/by-uuid/500107f1-c3cd-49cf-ab96-015c66fdee8e   none          luks

The UUID is the one of the crypted partition (s. b.)
      Code:
# ls -la /etc/crypttab
-rw-r--r-- 1 root root 130 Jun 14 15:22 /etc/crypttab

      Code:
# ls -la /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Sep 24 18:03 3d668e5b-6b30-4c22-984e-48bc1034c677 -> ../../dm-1
lrwxrwxrwx 1 root root 10 Sep 24 18:03 500107f1-c3cd-49cf-ab96-015c66fdee8e -> ../../sda8
lrwxrwxrwx 1 root root 10 Sep 24 18:03 a82e6615-b28e-41ed-9570-6e17b2cb30b4 -> ../../sda2
lrwxrwxrwx 1 root root 10 Sep 24 18:03 b95bdb17-5437-455d-b994-482de77a8177 -> ../../sda6
lrwxrwxrwx 1 root root 10 Sep 24 18:03 bdb10050-684f-46c8-b840-a4172786db03 -> ../../sda5                                                                             
lrwxrwxrwx 1 root root 10 Sep 24 18:03 c06ba6a5-b781-4fd2-bb6a-7d8fe6dbeaf1 -> ../../sda7                                                                             
lrwxrwxrwx 1 root root 10 Sep 24 18:03 EEF48D95F48D6127 -> ../../sda3
lrwxrwxrwx 1 root root 10 Sep 24 18:03 F536-7A4D -> ../../sda1
 
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gerdOffline
Post subject:   PostPosted: 26.09.2010, 17:22



Joined: 2010-09-13
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No, i didn't touched the crypttab.
But as my workaround works and the problem was only with my usb backup disks, which will be turned off the next months, i will not bother about this problem anymore.
 
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