[PATCH v2 0/5] Git filter protocol

From: Lars Schneider <larsxschneider@gmail.com>

Hi,

thanks a lot for the extensive reviews. I tried to address all mentioned
concerns and summarized them below. The most prominent changes since v1 are
the following:
* pipe communication uses a packet format (pkt-line) based protocol
* a long running filter application is defined with "filter.<driver>.process"
* Git offers a number of filter capabilties that a filter can request
  (right now only "smudge" and "clean" - in the future maybe "cleanFromFile",
  "smudgeToFile", and/or "stream")

Cheers, Lars

## Torsten:
* add "\n" line terminator after version in init sequence
* prepare big file for EXPENSIVE tests once
* set "#!/usr/bin/perl" as shebang for rot13.pl to mimic other Perl test scripts
* add test_have_prereq PERL to t0021

## Ramsay:
* use write_in_full(process->in, nbuf.buf, nbuf.len) to avoid unneccsary strlen call
* use read_in_full to read data that exceeds MAX_IO_SIZE properly
* fix test case to check for large file filtering

## Jakub:
* use standard input/standard output instead of stdin/stdout
* replace global variable "cmd_process_map" with a function parameter where possible
* avoid "strbuf_reset" after STRBUF_INIT
* align test_config_global
* rename rot13.pl to rot13-filter.pl
* make Perl style consistent
* describe hard coded filenames in test filter header
* improve docs
* add filter capabilities field (enables cleanToFile, smudgeFromFile, and/or stream later)
* explain that content size in bytes is encoded in ASCII
* consistent line ending for die call in Perl (without "\n")
* make rot13 test filter die in case of failure (instead of returning "fail")

## Eric:
* flush explicitly in Perl test filter
* do not initialize variables to NULL if they are set unconditionally
* fix no-op stop_protocol_filter
* use off_t instead of size_t
* improve test filter int parsing ($filelen =~ /\A\d+\z/ or die "bad filelen: $filelen")

## Peff:
* use pkt-line protocol
* do not use Perl autodie

## Remi:
* remove spaces after '<'

Lars Schneider (5):
  convert: quote filter names in error messages
  convert: modernize tests
  pkt-line: extract and use `set_packet_header` function
  convert: generate large test files only once
  convert: add filter.<driver>.process option

 Documentation/gitattributes.txt |  54 +++++++-
 convert.c                       | 281 +++++++++++++++++++++++++++++++++++++---
 pkt-line.c                      |  15 ++-
 pkt-line.h                      |   1 +
 t/t0021-conversion.sh           | 272 ++++++++++++++++++++++++++++++++------
 t/t0021/rot13-filter.pl         | 146 +++++++++++++++++++++
 6 files changed, 704 insertions(+), 65 deletions(-)
 create mode 100755 t/t0021/rot13-filter.pl

-- 2.9.0