[PATCH 0/5] Fix two mkdir/rmdir races

There seem to be a lot of mkdir/rmdir races in the Git code. Fix two of them.

It is hard to construct test cases for races without a lot of extra test infrastructure. So I have tested them as best I can using instrumented code (not included here).

Michael Haggerty (5):
  safe_create_leading_directories(): modernize format of "if" chaining
  safe_create_leading_directories(): reduce scope of local variable
  safe_create_leading_directories(): add "slash" pointer
  safe_create_leading_directories(): fix a mkdir/rmdir race
  rename_ref(): fix a mkdir()/rmdir() race

 refs.c      | 10 +++++++++-
 sha1_file.c | 56 +++++++++++++++++++++++++++++++++-----------------------
 2 files changed, 42 insertions(+), 24 deletions(-)