[Buildroot] [PATCH 0/6 v2] fs: fix and better handle capabilities

Yann E. MORIN yann.morin.1998 at free.fr
Mon Nov 12 17:32:53 UTC 2018

Hello All!

As reported by Ricardo in #11216, and recently noticed thanks to the
runtime tests he added, handling file capabilities is broken.

Ricardo did a very good job at pinpointing the issue, and that is caused
by the recent-ish split of the filesystem infra with the use of the
intermediate tarball.

It turns out that playing with fakeroot, tar, and capabilities is a lost
game, as fakeroot behaves badly with the special handling tar does with
the security.capability extended attribute.

This series fixes the issue with the first patch, in which we simply get
rid of the intermediate tarball, and directly rsync from the global
target/ directory to populate the per-filesystem target directory. This
means that any common fincalisation under fakaeroot is no longer
possible, so they have to be replicated for each filesystem instead.

The only remaining common part is now the generation of the various
tables: devices, permisions and users.

Then, the tar filesystem is fixed to store the xattrs.

Then there are tow clean-up patches, which pave the way to two fixes.

First, we allow permissions provided by users to override the internal
permissions, as we do for all user-provided settings. Second, we fix the
static device creation conditions.

Yann E. MORIN.

The following changes since commit cd0ca09e43be8bd87fa35c96fa099a338b85de36

  {linux, linux-headers}: bump 4.{4, 9, 14, 18}.x series (2018-11-11 22:11:04 +0100)

are available in the git repository at:


for you to fetch changes up to ae80646fbb9d0e7f40434b16ebe5173ee3a4654c

  fs: make static device nodes creation more logical (2018-11-12 18:28:28 +0100)

Yann E. MORIN (6):
      fs: get over the intermediate tarball
      fs/tar: add support for xattrs (thus capabilties)
      fs: rename internal variable
      fs: split devices and permissions tables
      fs: allow user provided permissions to override packages permissions
      fs: make static device nodes creation more logical

 fs/common.mk                                    | 92 +++++++++++--------------
 fs/tar/tar.mk                                   |  2 +-
 support/testing/tests/core/test_post_scripts.py |  4 +-
 3 files changed, 44 insertions(+), 54 deletions(-)

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