[PATCH 1/2] fsmonitor: Read from getcwd(), not the PWD environment variable

[Alex Vandiver <alexmv@dropbox.com>]

Though the process has chdir'd to the root of the working tree, the
PWD environment variable is only guaranteed to be updated accordingly
if a shell is involved -- which is not guaranteed to be the case.
That is, if `/usr/bin/perl` is a binary, $ENV{PWD} is unchanged from
whatever spawned `git` -- if `/usr/bin/perl` is a trivial shell
wrapper to the real `perl`, `$ENV{PWD}` will have been updated to the
root of the working copy.

Update to read from the Cwd module using the `getcwd` syscall, not the
PWD environment variable.  The Cygwin case is left unchanged, as it
necessarily _does_ go through a shell.

Signed-off-by: Alex Vandiver <alexmv@dropbox.com>
---
 t/t7519/fsmonitor-watchman                 | 3 ++-
 templates/hooks--fsmonitor-watchman.sample | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/t/t7519/fsmonitor-watchman b/t/t7519/fsmonitor-watchman
index a3e30bf54..5fe72cefa 100755
--- a/t/t7519/fsmonitor-watchman
+++ b/t/t7519/fsmonitor-watchman
@@ -41,7 +41,8 @@ if ($system =~ m/^MSYS_NT/ || $system =~ m/^MINGW/) {
 	$git_work_tree =~ s/[\r\n]+//g;
 	$git_work_tree =~ s,\\,/,g;
 } else {
-	$git_work_tree = $ENV{'PWD'};
+	require Cwd;
+	$git_work_tree = Cwd::cwd();
 }
 
 my $retry = 1;
diff --git a/templates/hooks--fsmonitor-watchman.sample b/templates/hooks--fsmonitor-watchman.sample
index 9a082f278..ba6d88c5f 100755
--- a/templates/hooks--fsmonitor-watchman.sample
+++ b/templates/hooks--fsmonitor-watchman.sample
@@ -40,7 +40,8 @@ if ($system =~ m/^MSYS_NT/ || $system =~ m/^MINGW/) {
 	$git_work_tree =~ s/[\r\n]+//g;
 	$git_work_tree =~ s,\\,/,g;
 } else {
-	$git_work_tree = $ENV{'PWD'};
+	require Cwd;
+	$git_work_tree = Cwd::cwd();
 }
 
 my $retry = 1;
-- 
2.15.0.rc1.413.g76aedb451