[PATCH v2] git-send-email: honor $PATH for sendmail binary

[Florian Klink]

This extends git-send-email to also consider sendmail binaries in $PATH,
in addition to the (fixed) list of /usr/sbin and /usr/lib.fixed) list of
paths.

Signed-off-by: Florian Klink <flo...@flokli.de>
---
 Documentation/git-send-email.txt | 6 +++---
 git-send-email.perl              | 4 +++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index bac9014ac..7af48f8eb 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -203,9 +203,9 @@ a password is obtained using 'git-credential'.
        specify a full pathname of a sendmail-like program instead;
        the program must support the `-i` option.  Default value can
        be specified by the `sendemail.smtpServer` configuration
-       option; the built-in default is `/usr/sbin/sendmail` or
-       `/usr/lib/sendmail` if such program is available, or
-       `localhost` otherwise.
+       option; the built-in default is to search in $PATH,
+       then /usr/sbin and /usr/lib/sendmail afterwards if such program
+       is available, falling back to `localhost` otherwise.
 
 --smtp-server-port=<port>::
        Specifies a port different from the default port (SMTP
diff --git a/git-send-email.perl b/git-send-email.perl
index 2208dcc21..570f04079 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -885,7 +885,9 @@ if (defined $initial_reply_to) {
 }
 
 if (!defined $smtp_server) {
-       foreach (qw( /usr/sbin/sendmail /usr/lib/sendmail )) {
+       my @sendmail_paths = map {"$_/sendmail"} split /:/, $ENV{PATH};
+       push @sendmail_paths, qw( /usr/sbin/sendmail /usr/lib/sendmail );
+       foreach (@sendmail_paths) {
                if (-x $_) {
                        $smtp_server = $_;
                        last;
-- 
2.15.0