1. 02 Apr, 2010 1 commit
    • Jeff King's avatar
      introduce notes-cache interface · a941d5e3
      Jeff King authored
      Notes provide a fast lookup mechanism for data keyed by
      sha1. This is ideal for caching certain operations, like
      textconv filters.
      This patch builds some infrastructure to make it simpler to
      use notes trees as caches. In particular, caches:
        1. don't have arbitrary commit messages. They store a
           cache validity string in the commit, and clear the tree
           when the cache validity string changes.
        2. don't keep any commit history. The accumulated history
           of a a cache is just useless cruft.
        3. use a looser form of locking for ref updates. If two
           processes try to write to the cache simultaneously, it
           is OK if one overwrites the other, losing some changes.
           It's just a cache, so we will just end up with an extra
      Signed-off-by: default avatarJeff King <peff@peff.net>
      Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>