[PATCH 2/7] perl/Git.pm: set up command environment on Windows

["Gustavo L. de M. Chaves" <gnustavo@cpan.org>]

From: "Gustavo L. de M. Chaves" <gnustavo@cpan.org>

Routine _cmd_exec invokes _setup_git_cmd_env inside the child process
before invoking an external git command to set up the environment
variables GIT_DIR and GIT_WORK_TREE and, also, to chdir to the
repository. But _cmd_exec is only used on Unix. On Windows, it's not
used and the main code path is in _command_common_pipe, which didn't
prepare the environment like _cmd_exec.

Without this environment preparation some git commands, such as "git
clone", don't work.

We can't use _setup_git_cmd_env in this case because we don't use a
forking open like _cmd_exec does and don't get a chance to make such
preparations on the child process.

So, the preparation is done on _command_common_pipe by setting up
localized environment variables and by chdir temporarily just before
invoking the external command.

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
---
 perl/Git.pm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/perl/Git.pm b/perl/Git.pm
index 658b602..e14b41a 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -1302,6 +1302,19 @@ sub _command_common_pipe {
 		#	warn 'ignoring STDERR option - running w/ ActiveState';
 		$direction eq '-|' or
 			die 'input pipe for ActiveState not implemented';
+
+		# Set up repo environment
+		local $ENV{GIT_DIR}       = $self->repo_path() if defined $self && $self->repo_path();
+		local $ENV{GIT_WORK_TREE} = $self->wc_path()   if defined $self && $self->repo_path() && $self->wc_path();
+
+		my $cwd = cwd;
+
+		if (defined $self) {
+			chdir $self->repo_path() if $self->repo_path();
+			chdir $self->wc_path()	 if $self->wc_path();
+			chdir $self->wc_subdir() if $self->wc_subdir();
+		}
+
 		# the strange construction with *ACPIPE is just to
 		# explain the tie below that we want to bind to
 		# a handle class, not scalar. It is not known if
@@ -1310,6 +1323,7 @@ sub _command_common_pipe {
 		tie (*ACPIPE, 'Git::activestate_pipe', $cmd, @args);
 		$fh = *ACPIPE;
 
+		chdir $cwd;
 	} else {
 		my $pid = open($fh, $direction);
 		if (not defined $pid) {
-- 
1.7.12.464.g83379df.dirty