[PATCH v2 0/3] improve symbolic-ref robustness

On Sun, Dec 20, 2015 at 02:26:37AM -0500, Jeff King wrote:

I noticed that an interrupt "git symbolic-ref" will not clean up
"HEAD.lock". So I started this series as an attempt to convert
create_symref() to "struct lock_file" to get the usual tempfile cleanup.

Here's version 2, based on comments from Michael. The first two patches
were picked out separately for jk/symbolic-ref-maint, so I've dropped
them here (so 1+2 here are the original 3+4).

The other differences from v1 are:

  - use "refname" instead of "ref" to match surrounding code

  - drop adjust_shared_perm, as lockfile does it for us

  - adjust reflog writing order (done in a new patch)

The patches are:

  [1/3]: create_symref: modernize variable names
  [2/3]: create_symref: use existing ref-lock code
  [3/3]: create_symref: write reflog while holding lock

-Peff