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[PATCH v9 0/5] [GSoC] remove_subtree(): reimplement using iterators

This is the ninth version of a patch series that implements the GSoC
microproject of converting a recursive call to readdir() to use

v1: https://public-inbox.org/git/CAGZ79kZwT-9mHTiOJ5CEjk2wDFkn6+NcogjX0=vjhsAh16ANYg@xxxxxxxxxxxxxx/T/#t
v2: https://public-inbox.org/git/CACsJy8Dxh-QPBBLfaFWPAWUsbA9GVXA7x+mXLjEvYKhk1zOpig@xxxxxxxxxxxxxx/T/#t
v3: https://public-inbox.org/git/CAGZ79kYtpmURSQWPumobA=e3JBFjKhWCdv_LPhKCd71ZRwMovA@xxxxxxxxxxxxxx/T/#t
v4: https://public-inbox.org/git/1490747533-89143-1-git-send-email-bnmvco@xxxxxxxxx/T/#e437a63e0c22c00c69b5d92977c9b438ed2b9fd3a
v5: https://public-inbox.org/git/1490844730-47634-1-git-send-email-bnmvco@xxxxxxxxx/T/#m2323f15e45de699f2e09364f40a62e17047cf453
v6: https://public-inbox.org/git/1491107726-21504-1-git-send-email-bnmvco@xxxxxxxxx/T/#t
v7: https://public-inbox.org/git/1491163388-41255-1-git-send-email-bnmvco@xxxxxxxxx/T/#t
v8: https://public-inbox.org/git/a60b2ed6-2b99-b134-05af-7c8492a6949c@xxxxxxxxxxxx/T/#t

Travis CI build: https://travis-ci.org/theiostream/git/builds/222919383

I think this is the closest to a final version we've ever gotten. I
followed all of Michael and Stefan's suggestions on top of v8, and with
Michael's endorsement made dir_iterator_begin() return NULL and set
errno appropriately in case of an error.

On second thought, maybe the extra code complexity required from
dir_iterator_begin()'s callers might be actually an advantage as
dir_iterator grows to tackle more complex dir traversing challenges on
Git. After all, we might want some special behavior depending on what
the given `path` is instead of always considering it valid and later
behaving as if it was an empty directory.

Thanks again for the reviews.

Daniel Ferreira (5):
  dir_iterator: add tests for dir_iterator API
  remove_subtree(): test removing nested directories
  dir_iterator: add helpers to dir_iterator_advance
  dir_iterator: refactor state machine model
  remove_subtree(): reimplement using iterators

 Makefile                        |   1 +
 dir-iterator.c                  | 252 +++++++++++++++++++++++++++++-----------
 dir-iterator.h                  |  35 ++++--
 entry.c                         |  42 +++----
 refs/files-backend.c            |  51 +++++---
 t/helper/.gitignore             |   1 +
 t/helper/test-dir-iterator.c    |  53 +++++++++
 t/t0065-dir-iterator.sh         | 113 ++++++++++++++++++
 t/t2000-checkout-cache-clash.sh |  11 ++
 9 files changed, 435 insertions(+), 124 deletions(-)
 create mode 100644 t/helper/test-dir-iterator.c
 create mode 100755 t/t0065-dir-iterator.sh

2.7.4 (Apple Git-66)