Re: [PATCH v2 00/15][GSoC] iterate dirs before or after their contents

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On 09/05/2022 18:51, Plato Kiorpelidis wrote:
This is the second version of a patch series which implements pre-order and
post-order iteration over directories. In this version I use the new iteration
scheme to convert entry.c remove_subtree() function from using opendir/readdir/
closedir API to dir-iterator API.

v1: https://lore.kernel.org/git/20220410111852.2097418-1-kioplato@xxxxxxxxx/

Fork: https://github.com/kioplato/git/tree/dir-iterator-v2
CI: https://github.com/kioplato/git/actions/runs/2295239114
I've ran the full test suite for each commit.

In comparison to v1 I changed/fixed/improved:

* In this version I followed Phillip's suggestion[1] to explain why I'm making
the changes in each commit's description and create smaller, targeted commits.
In v1 I did a lot of renaming to directory paths, test descriptions and files.
In this version these renames have their own commits.

* Explained why I converted dir_iterator_advance() from iterative implementation
to recursive in the related commit. Ævar[2] and Phillip[3] asked about why I did
this conversion, so I thought it was appropriate to include an explanation in
the commit's description.

* I talked about a subtle unexpected behavior of dir_iterator_begin() [4]. I was
wrong about the two new states for the deepest directory. I introduced those
states in order to implement recursive dir_iterator_advance() and not to deal
with the unexpected behavior of dir_iterator_begin(). Therefore I splitted the
conversion of dir_iteartor_advance() and the changes to deal with the unexpected
behavior of dir_iteartor_begin() into two different commits. They need their own
commits since they are two unrelated changes.

* Split the commit that introduces pre-order and post-order iteration into two.
Like Phillip suggested here[5] the first changes dir-iterator default behavior
and the second implements post-order iterator over directories. This helps split
the tests introduced, which helps generate smaller diffs.

* Like Phillip suggested [6], I'll work with the existing code and change one
aspect at a time in stages. In this series I converted entry.c remove_subtree()
to use dir-iterator API instead of opendir/readdir/closedir API.

* The redundant tests [7] in this version were not removed. Instead I kept them
for more detailed testing which helps in case a test fails.

* Ævar's idea[8] to change the default swich case in test-dir-iterator made me
realize that test-dir-iterator does not print errno codes set by failed calls to
dir_iterator_advance(). Therefore I made test-dir-iterator print them which
makes all tests test_cmp for the errno code set by either dir_iteartor_begin()
or dir_iterator_advance(). This presumably has the same effect as changing the
default switch case to use BUG() macro. This change also led to two others, one
that makes test-dir-iterator explicitly print ELOOP errno and the second that
improves readability by consistently returning, C standard constants, either
EXIT_SUCCESS or EXIT_FAILURE, instead of mixed integers and exit() calls.

* fixed coding style and introduces an enum for returning constants instead of
more integers which worsens readability, as suggested by Ævar [9].

I also didn't CC Michael and Matheus in this version, since they weren't
interested in v1 where I did CC them.

Thanks for the detailed change description. I've commented on the implementation but I've not had time to look at the test changes. I'm afraid I still don't see the initial refactoring of dir-iterator.c as am improvement. It is nice to see the post order traversal being used in remove_subtree(). Just to let you know, I'm going to off the list for the next couple of weeks, I'll try and catch up with this series later.

Best Wishes

Phillip

[1]: https://lore.kernel.org/git/ed6656e0-a865-319e-0f56-23ab1da3eef3@xxxxxxxxx/
[2]: https://lore.kernel.org/git/220411.86o817j2dt.gmgdl@xxxxxxxxxxxxxxxxxxx/
[3]: https://lore.kernel.org/git/35160d46-d337-2110-f968-238abb7e9f0e@xxxxxxxxx/
[4]: https://lore.kernel.org/git/20220427154526.uuhpkoee322l7kmz@compass/
[5]: https://lore.kernel.org/git/b75aaee8-c037-e8e0-6ee0-729922059352@xxxxxxxxx/
[6]: https://lore.kernel.org/git/df287d4f-e9da-4ce0-d7e9-1b1fe7671aab@xxxxxxxxx/
[7]: https://lore.kernel.org/git/220411.86sfqjj2o0.gmgdl@xxxxxxxxxxxxxxxxxxx/
[8]: https://lore.kernel.org/git/220411.86wnfvj2q6.gmgdl@xxxxxxxxxxxxxxxxxxx/
[9]: https://lore.kernel.org/git/220411.86o817j2dt.gmgdl@xxxxxxxxxxxxxxxxxxx/

Plato Kiorpelidis (15):
   t0066: refactor dir-iterator tests
   t0066: remove dependency between unrelated tests
   t0066: shorter expected and actual output file names
   test-dir-iterator: consistently return EXIT_FAILURE or EXIT_SUCCESS
   test-dir-iterator: print EACCES and ELOOP errno set by dir_iterator
   test-dir-iterator: print errno name set by dir_iterator_advance
   t0066: better test coverage for dir-iterator
   t0066: reorder tests from simple to more complex
   t0066: rename test directories
   dir-iterator: refactor dir_iterator_advance()
   dir-iterator: open root dir in dir_iterator_begin()
   t0066: rename subtest descriptions
   dir-iterator: option to iterate dirs in pre-order
   dir-iterator: option to iterate dirs in post-order
   entry.c: use dir-iterator to avoid explicit dir traversal

  builtin/clone.c              |    4 +-
  dir-iterator.c               |  334 ++++++--
  dir-iterator.h               |   36 +-
  entry.c                      |   38 +-
  refs/files-backend.c         |    2 +-
  t/helper/test-dir-iterator.c |   24 +-
  t/t0066-dir-iterator.sh      | 1478 +++++++++++++++++++++++++++++++---
  7 files changed, 1704 insertions(+), 212 deletions(-)





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