[PATCH 00/21] replacement for dt/refs-backend-lmdb v7 patch 04/33

Patch 04/33 in David Turner's refs-backend-lmdb series v7 [1] did way too much in a single patch, and in fact got a few minor things wrong. Instead of that patch, I suggest this patch series, which

* Splits the changes into smaller steps.

* Adds a bunch of tests of deleting references with invalid but safe
  names, including symbolic references and including references
  reached via symbolic references. Two of these tests fail when run
  against David's patch 04 due to changes in output.

* Arranges for the "flags" argument to read_raw_ref() always to be
  non-NULL, which eliminates the need for a lot of "if (flags)"
  guards.

* Eliminates the now-superfluous "bad_name" local variable.

* Move the management of the scratch space sb_path from
  resolve_ref_unsafe() to read_raw_ref().

* Inlines resolve_ref_1() into resolve_ref_unsafe().

* Changes some callers of resolve_ref_unsafe() to pass flags=NULL
  instead of creating a local flags variable that is never used.

* Changes some callers to check for errors before using the return
  value of resolve_ref_unsafe().

I hope that the result is easier to understand and audit, even though it consists of more patches (indeed, *because* of that).

This patch series applies on top of David's patch 03/33 the same place David applied it in his repo [2]. It is also available in situ from my GitHub repo [3] as branch "pluggable-backends-patch4"

If this series is used, later patches from David's series would need to be rebased on top of it. This is a little bit messy but not difficult; the result can be seen in branch "pluggable-backends-rebased" in my GitHub repo [3] (albeit without adjusting the LMDB-related patches).

Michael

[1] http://article.gmane.org/gmane.comp.version-control.git/287971 [2] https://github.com/dturner-tw/git/tree/dturner/pluggable-backends [3] https://github.com/mhagger/git

David Turner (1):
  files-backend: break out ref reading

Michael Haggerty (20):
  t1430: test the output and error of some commands more carefully
  t1430: clean up broken refs/tags/shadow
  t1430: don't rely on symbolic-ref for creating broken symrefs
  t1430: test for-each-ref in the presence of badly-named refs
  t1430: improve test coverage of deletion of badly-named refs
  resolve_missing_loose_ref(): simplify semantics
  resolve_ref_unsafe(): use for loop to count up to MAXDEPTH
  resolve_ref_unsafe(): ensure flags is always set
  resolve_ref_1(): eliminate local variable
  resolve_ref_1(): reorder code
  resolve_ref_1(): eliminate local variable "bad_name"
  read_raw_ref(): manage own scratch space
  Inline resolve_ref_1() into resolve_ref_unsafe()
  read_raw_ref(): change flags parameter to unsigned int
  fsck_head_link(): remove unneeded flag variable
  cmd_merge(): remove unneeded flag variable
  get_default_remote(): remove unneeded flag variable
  checkout_paths(): remove unneeded flag variable
  check_aliased_update(): check that dst_name is non-NULL
  show_head_ref(): check the result of resolve_ref_namespace()

 builtin/checkout.c          |   3 +-
 builtin/fsck.c              |   3 +-
 builtin/merge.c             |   4 +-
 builtin/receive-pack.c      |   2 +-
 builtin/submodule--helper.c |   3 +-
 http-backend.c              |   4 +-
 refs/files-backend.c        | 341 ++++++++++++++++++++++++--------------------
 t/t1430-bad-ref-name.sh     | 132 +++++++++++++++--
 8 files changed, 312 insertions(+), 180 deletions(-)