From c5f889bb4d10a260440796246a74190ad13431d5 Mon Sep 17 00:00:00 2001
From: Kevin Baensch <kb@ujamii.com>
Date: Thu, 17 Nov 2022 14:51:49 +0100
Subject: [PATCH] Make hostman listen for docker events.

---
 script/hostman.sh | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/script/hostman.sh b/script/hostman.sh
index 634b22f..4b9e9d9 100755
--- a/script/hostman.sh
+++ b/script/hostman.sh
@@ -7,17 +7,17 @@
 [ -z $DOCKER_HOSTNAME_VAR ] && DOCKER_HOSTNAME_VAR="VIRTUAL_HOST"
 
 query_docker () {
-    echo $(curl --unix-socket $DOCKER_SOCK_PATH --silent -g http://v1.41/$1/json$2)
+    curl --unix-socket $DOCKER_SOCK_PATH --silent -g http://v1.41/$1$2
 }
 
 get_host_list() {
     PROXY_HOST_CONF=""
-    CONTAINER_LIST=$(query_docker "containers" "?filters={%22network%22:[%22${NETWORK_NAME}%22],%22status%22:[%22running%22]}" | jq -cr '.[].Id')
+    CONTAINER_LIST=$(query_docker "containers/json" "?filters={%22network%22:[%22${NETWORK_NAME}%22],%22status%22:[%22running%22]}" | jq -cr '.[].Id')
 
     for id in $CONTAINER_LIST
     do
         # Query individual container to access relevant data
-        CONTAINER_DATA=$(query_docker "containers/${id}")
+        CONTAINER_DATA=$(query_docker "containers/${id}/json")
         if $RESOLVE_LOCALHOST
         then
             HOST_IP=$(echo $CONTAINER_DATA | jq -cr '.NetworkSettings.Networks.proxy.IPAddress')
@@ -35,9 +35,20 @@ get_host_list() {
     echo $PROXY_HOST_CONF
 }
 
-while true
-do
+update_host_list() {
     FILTERED_HOSTS=$(grep -ve "# Added by hostman$" $HOST_CONF_PATH)
     echo -e "$FILTERED_HOSTS$(get_host_list)" > $HOST_CONF_PATH
-    sleep 10
+}
+
+update_host_list
+# cannot filter because reailine no longer recognized lines otherwise (check how IFS changes)
+query_docker "events" | while  true
+do
+    read -r;
+    # wait for related events to finish
+    while [ $? -eq 0 ]
+    do
+        read -t 5 -r;
+    done
+    update_host_list
 done