[PATCH v2 0/5] minor pack-name cleanups

Here's a re-roll of the series from:

  http://public-inbox.org/git/20170315212617.6x57bvltinuozv4q@sigill.intra.peff.net/

The general gist is the same, but there are a number of changes:

  - I dropped the first patch factoring out finalize_file(), as Ramsay
    pointed out a subtle difference between the index and pack handling.

  - I added an extra patch on top (5/5 here) to get the same
    pointer-aliasing safety that the factored-out function got us
    (more so, actually, as it protects keep_msg, too).

  - I re-ordered the odb_pack_keep() cleanup before the odb_pack_name()
    cleanups, which lets us do the latter in one swoop (and avoids
    explaining "well, we can't do .keep yet, because..." in the commit
    message)

  - The original had two patches doing the odb_pack_name() conversion.
    Now that it has fewer caveats, I felt comfortable lumping it all
    into one (patch 4/5 here).

  [1/5]: move odb_* declarations out of git-compat-util.h
  [2/5]: sha1_file.c: make pack-name helper globally accessible
  [3/5]: odb_pack_keep(): stop generating keepfile name
  [4/5]: replace snprintf with odb_pack_name()
  [5/5]: index-pack: make pointer-alias fallbacks safer

 builtin/index-pack.c | 31 +++++++++++++++----------------
 cache.h              | 21 +++++++++++++++++++++
 environment.c        |  6 ++----
 fast-import.c        | 26 +++++++++++++-------------
 git-compat-util.h    |  2 --
 sha1_file.c          | 17 ++++++-----------
 6 files changed, 57 insertions(+), 46 deletions(-)