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epriestley c6fc05ee09 Pull Git filesize logic into a separate LowLevel query and use more Iterators
Summary:
Depends on D19829. Ref T13216. See PHI908. The current implementation is kind of a lot to live in `CommitHookEngine` and will likely fail if `git diff-tree` produces more than 2GB of output.

Pull it out and make it slightly more robust against enormous commits. It's probably limited by this, now:

```
implode("\n", $every_path)
```

We could replace that with some `PhutilReverseRopeSource` primitive or something but since we don't have one of those and it seems unlikely that we'll hit this case in practice, I left it here for now with just the easy stuff converted to be stream-oriented.

Test Plan:
Used this script to test the query against various commits, got good results:

```
<?php

require_once 'scripts/init/init-script.php';

$viewer = PhabricatorUser::getOmnipotentUser();

$repository = id(new PhabricatorRepositoryQuery())
  ->setViewer($viewer)
  ->withCallsigns(array('P'))
  ->executeOne();

var_dump(
  id(new DiffusionLowLevelFilesizeQuery())
    ->setRepository($repository)
    ->withIdentifier($argv[1])
    ->execute());
```

Used this to find large commits in history and pull filesizes (worked great, although our largest commit only touches a couple thousand paths):

```
for hash in `git log --format=%H`; do echo -n $hash; echo -n ' '; git diff-tree -r --no-commit-id $hash | wc -l | awk '{print $1}'; done | awk '{print $2 " " $1}' | sort -n
```

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13216

Differential Revision: https://secure.phabricator.com/D19830
2018-11-28 14:32:59 -08:00
bin Add a bin/herald test ... for doing test runs via the CLI 2018-11-15 15:48:52 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Recover when cookies are disabled in Firefox and accessing localStorage throws 2018-11-26 16:30:42 -08:00
scripts Add a bin/herald test ... for doing test runs via the CLI 2018-11-15 15:48:52 -08:00
src Pull Git filesize logic into a separate LowLevel query and use more Iterators 2018-11-28 14:32:59 -08:00
support Use phutil_microseconds_since(...) to simplify some timing arithmetic 2018-11-08 16:46:32 -08:00
webroot Recover when cookies are disabled in Firefox and accessing localStorage throws 2018-11-26 16:30:42 -08:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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