[PATCH v4 0/5] Improving performance of git clean

v3 of the patch can be found here: http://thread.gmane.org/gmane.comp.version-control.git/267422

Changes in v4:
* changed some tests to use more meaningful dir names.
* fixed performance test by doing "git clean -n" to avoid
  timing setup code. Increased test size to 100000 directories
  (~0.5s runtime).
* changed interface of read_gitfile_gently to be able to
  return error code.
* fixed a compiler warning in read_gitfile_gently ("warning:
  ‘dir’ may be used uninitialized in this function").
* added sanity check of git file size in read_gitfile_gently
* updated commit message in [5/5] to more clearly motivate
  remaining behavioral changes of git clean.

Thanks to Junio C Hamano and Jeff King for comments and help on v3.

Erik Elfström (5):
  setup: add gentle version of read_gitfile
  setup: sanity check file size in read_gitfile_gently
  t7300: add tests to document behavior of clean and nested git
  p7300: add performance tests for clean
  clean: improve performance when removing lots of directories

 builtin/clean.c       |  26 +++++++++--
 cache.h               |   3 +-
 setup.c               |  88 ++++++++++++++++++++++++++++-------
 t/perf/p7300-clean.sh |  31 +++++++++++++
 t/t7300-clean.sh      | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 252 insertions(+), 22 deletions(-)
 create mode 100755 t/perf/p7300-clean.sh