Unless --no-validate is passed, send-email will invoke
$repo->repo_path() in its search for a validate hook regardless of
whether a Git repo is actually present.  Teach send-email to first check
for repo existence.

Signed-off-by: Jonathan Tan <jonathanta...@google.com>
---
Thanks for the notification. Here's a patch to fix that.
---
 git-send-email.perl   | 32 +++++++++++++++++---------------
 t/t9001-send-email.sh |  8 ++++++++
 2 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index f0417f64e..94c54dc5a 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1755,21 +1755,23 @@ sub unique_email_list {
 sub validate_patch {
        my $fn = shift;
 
-       my $validate_hook = catfile(catdir($repo->repo_path(), 'hooks'),
-                                   'sendemail-validate');
-       my $hook_error;
-       if (-x $validate_hook) {
-               my $target = abs_path($fn);
-               # The hook needs a correct cwd and GIT_DIR.
-               my $cwd_save = cwd();
-               chdir($repo->wc_path() or $repo->repo_path())
-                       or die("chdir: $!");
-               local $ENV{"GIT_DIR"} = $repo->repo_path();
-               $hook_error = "rejected by sendemail-validate hook"
-                       if system($validate_hook, $target);
-               chdir($cwd_save) or die("chdir: $!");
-       }
-       return $hook_error if $hook_error;
+       if ($repo) {
+               my $validate_hook = catfile(catdir($repo->repo_path(), 'hooks'),
+                                           'sendemail-validate');
+               my $hook_error;
+               if (-x $validate_hook) {
+                       my $target = abs_path($fn);
+                       # The hook needs a correct cwd and GIT_DIR.
+                       my $cwd_save = cwd();
+                       chdir($repo->wc_path() or $repo->repo_path())
+                               or die("chdir: $!");
+                       local $ENV{"GIT_DIR"} = $repo->repo_path();
+                       $hook_error = "rejected by sendemail-validate hook"
+                               if system($validate_hook, $target);
+                       chdir($cwd_save) or die("chdir: $!");
+               }
+               return $hook_error if $hook_error;
+       }
 
        open(my $fh, '<', $fn)
                or die sprintf(__("unable to open %s: %s\n"), $fn, $!);
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 15128c755..d1e4e8ad1 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -1953,4 +1953,12 @@ test_expect_success $PREREQ 'invoke hook' '
        )
 '
 
+test_expect_success $PREREQ 'test that send-email works outside a repo' '
+       nongit git send-email \
+               --from="Example <nob...@example.com>" \
+               --to=nob...@example.com \
+               --smtp-server="$(pwd)/fake.sendmail" \
+               "$(pwd)/0001-add-master.patch"
+'
+
 test_done
-- 
2.13.0.506.g27d5fe0cd-goog

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