[PATCH] test: add configurable port to smtp-dummy

[David Bremner]

This is to allow smtp-dummy to potentially be used from multiple T*.sh
without collisions during parallel test running.
---
 test/T310-emacs.sh | 3 +++
 test/smtp-dummy.c  | 7 ++++++-
 test/test-lib.sh   | 4 +++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/test/T310-emacs.sh b/test/T310-emacs.sh
index c06a8133..3eab1ba9 100755
--- a/test/T310-emacs.sh
+++ b/test/T310-emacs.sh
@@ -5,6 +5,9 @@ test_description="emacs interface"
 
 EXPECTED=$NOTMUCH_SRCDIR/test/emacs.expected-output
 
+# this port must be unique to each test script using smtp-dummy
+export SMTP_DUMMY_PORT=25125
+
 add_email_corpus
 
 # syntax errors in test-lib.el cause mysterious failures
diff --git a/test/smtp-dummy.c b/test/smtp-dummy.c
index 71992edd..4cd66f5c 100644
--- a/test/smtp-dummy.c
+++ b/test/smtp-dummy.c
@@ -120,6 +120,7 @@ int
 main (int argc, char *argv[])
 {
     const char *progname;
+    const char *port_str;
     char *output_filename;
     FILE *peer_file = NULL, *output = NULL;
     int sock = -1, peer, err;
@@ -191,7 +192,11 @@ main (int argc, char *argv[])
 
     memset (&addr, 0, sizeof (addr));
     addr.sin_family = AF_INET;
-    addr.sin_port = htons (25025);
+    if ((port_str = getenv ("SMTP_DUMMY_PORT")))
+	addr.sin_port = htons (atoi (port_str));
+    else
+	addr.sin_port = htons (25025);
+
     addr.sin_addr = *(struct in_addr *) hostinfo->h_addr;
     err = bind (sock, (struct sockaddr *) &addr, sizeof (addr));
     if (err) {
diff --git a/test/test-lib.sh b/test/test-lib.sh
index 43339902..f3be537b 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -93,6 +93,8 @@ TEST_GDB=${TEST_GDB:-gdb}
 TEST_CC=${TEST_CC:-cc}
 TEST_CFLAGS=${TEST_CFLAGS:-"-g -O0"}
 
+SMTP_DUMMY_PORT=${SMTP_DUMMY_PORT:-25025}
+
 # Protect ourselves from common misconfiguration to export
 # CDPATH into the environment
 unset CDPATH
@@ -324,7 +326,7 @@ emacs_deliver_message ()
 	"(let ((message-send-mail-function 'message-smtpmail-send-it)
                (mail-host-address \"example.com\")
 	       (smtpmail-smtp-server \"localhost\")
-	       (smtpmail-smtp-service \"25025\"))
+	       (smtpmail-smtp-service \"${SMTP_DUMMY_PORT}\"))
 	   (notmuch-mua-mail)
 	   (message-goto-to)
 	   (insert \"test_suite at notmuchmail.org\nDate: 01 Jan 2000 12:00:00 -0000\")
-- 
2.20.1