buildhistory: improve git commit robustness

* Check if BUILDHISTORY_DIR exists before doing anything with it, in
  case no tasks that would have created it have executed
* Ensure the git repo in BUILDHISTORY_DIR is initialised with "git init"
  before attempting to do anything with it
* Check if any files have been added or changed before adding and
  committing, to avoid an error from "git commit"

(From OE-Core rev: 8eff4fea13317a741114f2a2e8e228d0155ba64c)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions