if sigterm received, and networking is up, exit 0

LP: #1015223

1 files changed, 42 insertions, 11 deletions

diff --git a/upstart/cloud-init-nonet.conf b/upstart/cloud-init-nonet.conf
index 118ffc1c..bdeb5a2e 100644
--- a/upstart/cloud-init-nonet.conf
+++ b/upstart/cloud-init-nonet.conf
@@ -10,19 +10,50 @@ task
 console output
 
 script
-   # /run/network/static-network-up-emitted is written by
-   # upstart (via /etc/network/if-up.d/upstart). its presense would
-   # indicate that static-network-up has already fired.
-	EMITTED="/run/network/static-network-up-emitted"
-   [ -e "$EMITTED" -o -e "/var/$EMITTED" ] && exit 0
+   set +e  # you cannot trap TERM reliably with 'set -e'
+   SLEEP_CHILD=""
 
+   static_network_up() {
+	   local emitted="/run/network/static-network-up-emitted"
+      # /run/network/static-network-up-emitted is written by
+      # upstart (via /etc/network/if-up.d/upstart). its presense would
+      # indicate that static-network-up has already fired.
+      [ -e "$emitted" -o -e "/var/$emitted" ]
+   }
+   msg() {
+      echo "$UPSTART_JOB:" "$1"
+   }
+
+   handle_sigterm() {
+      # if we received sigterm and static networking is up then it probably
+      # came from upstart as a result of 'stop on static-network-up'
+      [ -z "$SLEEP_CHILD" ] || kill $SLEEP_CHILD
+      if static_network_up; then
+         msg "static networking is now up"
+         exit 0
+      fi
+      exit 2
+   }
+
+   dowait() {
+      msg "waiting $1 seconds for network device"
+      sleep "$1" &
+      SLEEP_CHILD=$!
+      wait $SLEEP_CHILD
+      SLEEP_CHILD=""
+   }
+
+   trap handle_sigterm TERM
+
+   # static_network_up already occurred
+   static_network_up && exit 0
+
+   # obj.pkl comes from cloud-init-local (or previous boot and
+   # manual_cache_clean)
    [ -f /var/lib/cloud/instance/obj.pkl ] && exit 0
 
-   short=10; long=120;
-   sleep ${short}
-   echo $UPSTART_JOB "waiting ${long} seconds for a network device."
-   sleep ${long}
-   echo $UPSTART_JOB "gave up waiting for a network device."
+   dowait 10
+   dowait 120
+   msg "gave up waiting for a network device."
    : > /var/lib/cloud/data/no-net
 end script
-# EOF