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I have two writeable directories branch1 and branch2 tied together with AUFS on Debian 8 to the mount point union.

Mount options: br=branch1=rw:branch2=rw

branch1 and branch2 each contain a subdirectory dir with permissions 700. When I change the permissions with chmod 755 union/dir, only the first directory branch1/dir is altered, branch2/dir ramains as it is.

Problem: Group and other users can't access union/dir even after setting chmod 755 because branch2/dir is still chmod 700.

Is there a way to make AUFS apply changed permissions to all directories in the union or is it always limited to the topmost one?

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  • What is the unserlying filesystem used? aufs reportedly has problems dealing with btrfs. Commented Jun 6, 2015 at 12:48
  • @Ned64 It is ext4. Commented Jun 6, 2015 at 13:24
  • There is a mount option dirperm1 that works around the problem. Commented Jun 7, 2015 at 13:51
  • Apparently this behavior is by design: sourceforge.net/p/aufs/bugs/21/#1293 and dirperm1 is necessary. Commented Jun 7, 2015 at 17:08

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It sounds to me like you have done everything right, so I would suggest filing a bug against aufs.

PS: Kontrollfreak has done that already, and the fix is to use the dirperm1 mount option, according to http://sourceforge.net/p/aufs/bugs/21/#1293 . Thanks for your research @Kontrollfreak .

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  • I compiled a new kernel 3.19.8 with aufs 3.19 to verify this is not a bug in the Debian package and it isn't. So I filed a bug report at aufs.sourceforge.net. Thanks for bringing me on the right track. Commented Jun 7, 2015 at 13:50

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