File 1155-Don-t-send-unasked-for-systemd-notificatio... of Package erlang

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File 1155-Don-t-send-unasked-for-systemd-notifications.patch of Package erlang (Revision d640c60217a54e3d275f1b5b4a2197bf)

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From 16b921ad1c847ba0754adc10d2d45b17973dcd19 Mon Sep 17 00:00:00 2001
From: Alexey Lebedeff <alebedev@mirantis.com>
Date: Tue, 29 Mar 2016 20:30:22 +0300
Subject: [PATCH] Don't send unasked for systemd notifications

Suppose we have some erlang system that uses systemd unit with
Type=notify - so this should send startup confirmation itself. But if
systemd-enabled epmd will be started as a first step of that system
startup, empd startup confirmation will be misinterpeted by systemd. And
our erlang service will be considered 'ready' to early. Also this will
interefere with systemd MAINPID detection: systemd will be monitoring
`epmd` process instead of `beam` one.

For example, rabbitmq works around this issue by starting epmd using
separate short-lived beam process, with NOTIFY_SOCKET environment
variable reset - only in this way we could be sure that epmd will not
interfere with rabbit startup sequence.

This patch disables indiscriminate confirmation sending, and does it
only when it was explicitly asked to do so.
---
 erts/epmd/src/epmd.c     | 6 ++++--
 erts/epmd/src/epmd_srv.c | 8 +++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/erts/epmd/src/epmd.c b/erts/epmd/src/epmd.c
index 5513cb2..4740ce8 100644
--- a/erts/epmd/src/epmd.c
+++ b/erts/epmd/src/epmd.c
@@ -592,8 +592,10 @@ void epmd_cleanup_exit(EpmdVars *g, int exitval)
       free(g->argv);
   }
 #ifdef HAVE_SYSTEMD_DAEMON
-  sd_notifyf(0, "STATUS=Exited.\n"
-                "ERRNO=%i", exitval);
+  if (g->is_systemd){
+    sd_notifyf(0, "STATUS=Exited.\n"
+               "ERRNO=%i", exitval);
+  }
 #endif /* HAVE_SYSTEMD_DAEMON */
   exit(exitval);
 }
diff --git a/erts/epmd/src/epmd_srv.c b/erts/epmd/src/epmd_srv.c
index e1bac99..59d59ad 100644
--- a/erts/epmd/src/epmd_srv.c
+++ b/erts/epmd/src/epmd_srv.c
@@ -452,9 +452,11 @@ void run(EpmdVars *g)
   num_sockets = bound;
 #ifdef HAVE_SYSTEMD_DAEMON
     }
-    sd_notifyf(0, "READY=1\n"
-                  "STATUS=Processing port mapping requests...\n"
-                  "MAINPID=%lu", (unsigned long) getpid());
+    if (g->is_systemd) {
+      sd_notifyf(0, "READY=1\n"
+                    "STATUS=Processing port mapping requests...\n"
+                    "MAINPID=%lu", (unsigned long) getpid());
+    }
 #endif /* HAVE_SYSTEMD_DAEMON */
 
   dbg_tty_printf(g,2,"entering the main select() loop");
-- 
2.1.4

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File 1155-Don-t-send-unasked-for-systemd-notifications.patch of Package erlang (Revision d640c60217a54e3d275f1b5b4a2197bf)

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