[PATCH v2 00/14] Improved tool for testing across multiple namespaces

[David Gibson <david@gibson.dropbear.id.au>]

This series extends the "nsholder" tool we use in the tests to
"nstool" with some more features.  In particular it allows entering an
established namespace with capabilities intact, and it allows entering
them with less verbose options than nsenter.

For now this only gives a modest simplification of the tests, but it
should enable more in future.

I haven't managed to get all the way through the testsuite with this:
it's wedging in the IPv4 UDP throughput tests, but that's happening
for me with the main branch too.  I'll debug that, but I don't want to
delay this series on that for now.

Changes since v1:
 * Fixed a bunch of bad indentation from a bad copy/paste
 * Assorted minor cleanups based on review from Stefano

David Gibson (14):
  nstool: Rename nsholder to nstool
  nstool: Reverse parameters to nstool
  nstool: Move description of its operation modes from comment to usage
  nstool: Split some command line parsing and socket setup to
    subcommands
  nstool: Replace "pid" subcommand with "info" subcommand
  nstool: Detect what namespaces target is in
  nstool: Add magic number to advertized information
  nstool: Helpers to iterate through namespace types
  nstool: Add nstool exec command to execute commands in an nstool
    namespace
  nstool: Add --keep-caps option to nstool exec
  test: Initialise ${TRACE} properly
  test: Use "nstool exec" to slightly simplify tests
  nstool: Advertise the holder's cwd (in its mountns) across the socket
  nstool: Enter holder's cwd when changing mount ns with nstool exec

 test/.gitignore  |   2 +-
 test/Makefile    |   4 +-
 test/lib/context |  14 +-
 test/lib/setup   |  49 ++--
 test/nsholder.c  | 139 ------------
 test/nstool.c    | 565 +++++++++++++++++++++++++++++++++++++++++++++++
 test/run         |   5 +-
 7 files changed, 602 insertions(+), 176 deletions(-)
 delete mode 100644 test/nsholder.c
 create mode 100644 test/nstool.c

-- 
2.39.2