[PATCHv2 0/7] Rerolling sb/submodule-parallel-fetch for the time after 2.7

I am sending out a new version for replacing sb/submodule-parallel-fetch for the time after the 2.7 release.

* Dropped the patch, which introduces xread_nonblock
* strbuf_read_once uses xread now. This is safe as we poll before using
  strbuf_read_once, so we know we won't stall.
* have the commit message reworded for "run-command: add an asynchronous parallel child processor"
  with Johannes' suggestion.
  
  Thanks,
  Stefan

Jonathan Nieder (1):
  submodule.c: write "Fetching submodule <foo>" to stderr

Stefan Beller (6):
  xread: poll on non blocking fds
  strbuf: add strbuf_read_once to read without blocking
  sigchain: add command to pop all common signals
  run-command: add an asynchronous parallel child processor
  fetch_populated_submodules: use new parallel job processing
  submodules: allow parallel fetching, add tests and documentation

 Documentation/fetch-options.txt |   7 +
 builtin/fetch.c                 |   6 +-
 builtin/pull.c                  |   6 +
 run-command.c                   | 335 ++++++++++++++++++++++++++++++++++++++++
 run-command.h                   |  80 ++++++++++
 sigchain.c                      |   9 ++
 sigchain.h                      |   1 +
 strbuf.c                        |  11 ++
 strbuf.h                        |   8 +
 submodule.c                     | 141 +++++++++++------
 submodule.h                     |   2 +-
 t/t0061-run-command.sh          |  53 +++++++
 t/t5526-fetch-submodules.sh     |  71 ++++++---
 test-run-command.c              |  55 ++++++-
 wrapper.c                       |  20 ++-
 15 files changed, 731 insertions(+), 74 deletions(-)