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Is this technique of umask=0 safe to use on an NTFS volume? I want to |
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mount an NTFS drive on my desktop so that a regular user can access it. |
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Is there a similar way to mount it with only read permissions, |
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seeing as writing to NTFS drives isn't usually a particularly good idea |
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with Linux. |
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Thanks, |
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Mike Swanson |
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rearden@××××××××××××××.com |
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On Fri, 12 Aug 2005 21:45:44 +0200, Holly Bostick wrote: |
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>>> > Don't you mean umask=0? umask inverts the bits, so 777 gives |
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>>> > --------- to all files. |
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>>> > |
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>>> > |
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> |
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>> |
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>> I'm currently in the middle of an 'argument' with someone else about |
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>> this, so explain, please. |
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>> |
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>> If umask masks bits off of the 'default' permissions, then what is the |
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>> point of umask=000? |
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To give rwxrwxrwx, which is fine for a FAT filesystem, and certainly |
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better than --------- |
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>> It seems that it would leave the permissions as the |
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>> default, which appear to be 755 (is there a creation mask of 022 |
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>> somewhere in the 'default' settings? |
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And there's the rub. Setting permissions to 755 only gives write access |
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to the owner, which is root when mounting at bootup. The other way of |
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dealing with this with FAT filesystems is to use the uid/gid options to |
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set yourself as the user, but that only works on a single user system. |
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>> The other person says that umask=000 removes all restrictions and gives |
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>> all permissions to everybody, but I just don't understand how this |
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>> could be, unless the specific file/mount point was already set that way |
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>> (no file creation mask, so the files are 'created' with the default |
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>> 777/666, or inherited the permission structure of the parent). |
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The mount point is irrelevant, what counts is the permissions on the |
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mounted filesystem, not the parent of the mount point. Once you mount |
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something on it, it takes on the permissions of the mounted device. |
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# ls -ld t |
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drwxr-xr-x 2 root root 6 Apr 21 13:34 t |
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# mount /dev/sdd1 t -o umask=0 |
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# ls -ld t |
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drwxrwxrwx 7 root root 16384 Jan 1 1970 t |
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See, the 755 changes to the 777 specified in the mount |
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options. /dev/sdd1 is a FAT16 formatted flash disk. |
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-- Neil Bothwick "We demand rigidly defined areas of doubt and |
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uncertainty!" |
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-- |
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gentoo-user@g.o mailing list |
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