MinGW port pull request

From: Johannes Sixt <johannes.sixt@telecom.at>

Junio,

please pull the MinGW (Windows) port patch series from

git://repo.or.cz/git/mingw/j6t.git for-junio

The interdiff since I submitted the patch series

 http://thread.gmane.org/gmane.comp.version-control.git/75250/focus=76276

is below.

This code base has been used in production since months, and editorial issues have been ironed out since I submitted the series. The interdiff is fairly small (it's mostly some new vsnprintf() fixes and a new utime() wrapper). The interdiff does not show that we don't need to modify git-clone.sh anymore ;) IMHO, this is material for 'next'.

At this point I would like to thank all contributors to the porting effort. Some of your patches have been integrated in other patches in the series, which now carry my authorship (that is, I'm the one to blame), but I still have credited you in the commit message.

Here's the patch summary:

* Part 1: Get it going
01/38 Add compat/regex.[ch] and compat/fnmatch.[ch].
02/38 Compile some programs only conditionally.
03/38 Add target architecture MinGW.

With these patches we have a working git.exe that can successfully run those builtins that need only read-access of the repository, like git log, git diff, etc.

* Part 2: Working locally is possible
04/38 Windows: Use the Windows style PATH separator ';'.
05/38 Windows: Strip ".exe" from the program name.
06/38 Windows: Implement a wrapper of the open() function.
07/38 Windows: A minimal implemention of getpwuid().
08/38 Windows: always chmod(, 0666) before unlink().
09/38 Windows: Work around misbehaved rename().
10/38 setup.c: Prepare for Windows directory separators.
11/38 Windows: Treat Windows style path names.
12/38 Windows: Handle absolute paths in safe_create_leading_directories().
13/38 Windows: Implement gettimeofday().
14/38 Windows: Fix PRIuMAX definition.
15/38 Windows: Implement setitimer() and sigaction().

Now builtins that write to the repository work as long as they don't need to spawn secondary processes.

* Part 3: Shell scripts and start_command()
16/38 Windows: Wrap execve so that shell scripts can be invoked.
17/38 Windows: A pipe() replacement whose ends are not inherited to
      children.
18/38 Windows: Implement start_command().
19/38 Windows: Change the name of hook scripts to make them not
      executable.

Now scripted tools and the builtins and standalone programs work that depend on start_command().

* Part 4: Remote connections
20/38 Windows: A rudimentary poll() emulation.
21/38 Windows: Disambiguate DOS style paths from SSH URLs.
22/38 Windows: Implement asynchronous functions as threads.
23/38 Windows: Work around incompatible sort and find.
24/38 Windows: Implement wrappers for gethostbyname(), socket(), and
      connect().

Remote connections, both push and fetch, using local transport as well as connections via ssh and native git protocol work.

* Part 5: Optimizations
25/38 Windows: Implement a custom spawnve().
26/38 Windows: Add a new lstat and fstat implementation based on Win32
      API.
27/38 Windows: Add a custom implementation for utime().
28/38 Windows: Use a customized struct stat that also has the st_blocks
      member.

* Part 6: Tie up loose ends
29/38 Turn builtin_exec_path into a function.
30/38 Windows: Compute the fallback for exec_path from the program
      invocation.
31/38 Windows: Use a relative default template_dir and ETC_GITCONFIG
32/38 When installing, be prepared that template_dir may be relative.
33/38 Windows: Make the pager work.
34/38 Windows: Work around an oddity when a pipe with no reader is written
      to.
35/38 Windows: Make 'git help -a' work.
36/38 Windows: TMP and TEMP environment variables specify a temporary
      directory.
37/38 Windows: Fix ntohl() related warnings about printf formatting
38/38 compat/pread.c: Add a forward declaration to fix a warning

This fixes some final remaining oddities, minor missing features, and works around differences between POSIX and Windows.

 Documentation/git.txt |    6 +-
 Makefile              |   49 ++-
 cache.h               |    2 +-
 compat/fnmatch.c      |  488 +++++++++++++++++
 compat/fnmatch.h      |   84 +++
 compat/mingw.c        | 1008 +++++++++++++++++++++++++++++++++++
 compat/mingw.h        |  208 ++++++++
 compat/regex.c        | 4927 ++++++++++++++++++++(lots...)
 compat/regex.h        |  490 +++++++++++++++++
 compat/snprintf.c     |   19 +-
 connect.c             |    2 +-
 date.c                |    2 +-
 exec_cmd.c            |   41 ++-
 git-compat-util.h     |   31 +-
 git-sh-setup.sh       |   13 +
 git.c                 |   14 +
 help.c                |   33 +-
 pager.c               |   40 ++-
 path.c                |    7 +
 run-command.c         |  126 ++++-
 run-command.h         |    5 +
 setup.c               |   58 ++-
 sha1_file.c           |   14 +-
 templates/Makefile    |   11 +-
 transport.c           |    3 +-
 upload-pack.c         |    2 +
 write_or_die.c        |    7 +-
 27 files changed, 7617 insertions(+), 73 deletions(-)

Interdiff follows (it's line wrapped, just for exposition):