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Thread: One owner for a folder

  1. #1
    uluyol901 NNTP User

    Default One owner for a folder


    Is it possible to set an owner/set of permissions for a certain
    directory on an ext3 partition, and have all subdirs and files keep
    those as well?

    Example:
    I have an ext3 partition mounted at /files, and I want all the
    files/dirs in /files/shared to have root:user/777 permissions even with
    files added by a different user.

    Thanks.


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  2. #2
    ken yap NNTP User

    Default Re: One owner for a folder


    777 is a bad idea, at least you could have specified 775.

    Files inherit the owner + group of the creating process. If you let the
    users write to the filesystem directly, you can't control the uid/gid.
    To be able to control the uid/gid, you need an intermediate process
    between the user's process and the filesystem.

    Samba can do this. Besides samba you could try a FUSE filesystem to be
    the intermediary.


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  3. #3
    some-guy NNTP User

    Default Re: One owner for a folder


    How would I use FUSE?


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  4. #4
    ken yap NNTP User

    Default Re: One owner for a folder


    FUSE is not a single filesystem but rather a framework for creating
    filesystems that are materialised by a userspace process. FUSE provides
    the kernel hooks, and the libraries, and you have to provide the
    process. I don't know if there is any code ready-made for your
    requirements, but what you want is for a userspace process to manage the
    directory you want to give access to and then to reexport this as
    another filesystem. Have a look at the FUSE documentation.


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  5. #5
    ken yap NNTP User

    Default Re: One owner for a folder


    Another way, which I haven't looked at in any detail, is to use Posix
    ACL inheritance to give the appropriate permissions to objects in the
    subtree, bypassing the ownership issue. I'm assuming the reason you want
    a common owner is actually to make sure the files are available to all
    regardless of who created it. The common Linux filesystems support Posix
    ACLs. See the long discussion here. As you can see, the work was done by
    a SUSE developer.

    'POSIX Access Control Lists on Linux'
    (http://www.suse.de/~agruen/acl/linux-acls/online/)

    Take note of caveats re copying to other systems and backing up objects
    with Posix ACLs.

    But ACLs could be quite complex to understand, you should master the
    basic Unix permission system first. I can vouch for the complexity,
    having tangled with it on OS/X (also a Posix system, as it is based on
    BSD) today.


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  6. #6
    KaptRoger NNTP User

    Default Re: One owner for a folder


    The answer I believe is no.

    Users creating files in that directory will create files owned by
    themselves, with group access determined by their current primary group.
    The permissions on those newly created files will be determined by
    their umask.

    The only answer that springs to my mind is a cron run script (!)
    running every 5 mins that chowns (change user/group) and chmods (change
    permissions) (-R [recursive]) all everything below the nominated
    directory (/files). No perfect by any means, but might be acceptable to
    the users. I would suggest that the script sets the permissions for
    owner and group and sets world/other to nothing (chmod 770), and that
    you have a specific group that the users can belong to that is just for
    this directory (and others like it).

    ACLs won't achieve what you desire either, as the ownership of the
    files won't be changed, they will merely grant access to the files.

    Cheers


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