get rid of forego

As a side effect, this fixes the crash on restart if files referenced in previous generated configuration are now missing

Dockerfile

@@ -13,10 +13,6 @@ RUN apt-get update \
 RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
  && sed -i 's/^http {/&\n    server_names_hash_bucket_size 128;/g' /etc/nginx/nginx.conf
 
-# Install Forego
-ADD https://github.com/jwilder/forego/releases/download/v0.16.1/forego /usr/local/bin/forego
-RUN chmod u+x /usr/local/bin/forego
-
 ENV DOCKER_GEN_VERSION 0.7.3
 
 RUN wget https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
@@ -31,4 +27,3 @@ ENV DOCKER_HOST unix:///tmp/docker.sock
 VOLUME ["/etc/nginx/certs"]
 
 ENTRYPOINT ["/app/docker-entrypoint.sh"]
-CMD ["forego", "start", "-r"]

Dockerfile.alpine

@@ -10,10 +10,6 @@ RUN apk add --no-cache --virtual .run-deps \
 RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
  && sed -i 's/^http {/&\n    server_names_hash_bucket_size 128;/g' /etc/nginx/nginx.conf
 
-# Install Forego
-ADD https://github.com/jwilder/forego/releases/download/v0.16.1/forego /usr/local/bin/forego
-RUN chmod u+x /usr/local/bin/forego
-
 ENV DOCKER_GEN_VERSION 0.7.3
 
 RUN wget --quiet https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-alpine-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
@@ -28,4 +24,3 @@ ENV DOCKER_HOST unix:///tmp/docker.sock
 VOLUME ["/etc/nginx/certs"]
 
 ENTRYPOINT ["/app/docker-entrypoint.sh"]
-CMD ["forego", "start", "-r"]

Procfile

@@ -1,2 +0,0 @@
-dockergen: docker-gen -watch -notify "nginx -s reload" /app/nginx.tmpl /etc/nginx/conf.d/default.conf
-nginx: nginx

docker-entrypoint.sh

@@ -1,7 +1,86 @@
 #!/bin/bash
-set -e
+###############################################################################
+#
+# Signals:
+#   - HUP: reload docker-gen
+#   - USR1: reload nginx
+#
+###############################################################################
+set -u
 
-# Warn if the DOCKER_HOST socket does not exist
+function start_docker_gen {
+    echo "~~~~~ Starting docker-gen ~~~~~"
+    {
+        while true; do
+            docker-gen -watch -notify "kill -USR1 1" /app/nginx.tmpl /etc/nginx/conf.d/default.conf
+            echo "docker-gen exited"
+            echo "~~~~~ Restarting docker-gen ~~~~~~"
+        done
+    } &
+}
+
+function start_nginx {
+    echo "~~~~~ Starting nginx ~~~~~"
+    {
+        while true; do
+            nginx
+            echo "nginx exited, checking config..."
+            if nginx -t; then
+                echo "~~~~~ Restarting nginx ~~~~~~"
+            else
+                exit 1
+            fi
+        done
+    } &
+}
+
+
+function reload_nginx {
+    if pgrep nginx >/dev/null; then
+        # nginx is already running
+        echo "~~~~~ Reloading nginx ~~~~~"
+        pkill -HUP nginx
+    else
+        start_nginx
+    fi
+}
+
+###############################################################################
+
+function handle_SIGHUP {
+    echo "~~~~~ Signal HUP received ~~~~~"
+    if ! pgrep nginx >/dev/null; then
+        echo "~~~~~ Starting nginx ~~~~~"
+        nginx &
+    fi
+    pkill -HUP docker-gen  # forward SIGHUP to docker-gen
+    wait
+}
+
+function handle_SIGUSR1 {
+    echo "~~~~~ Signal USR1 received ~~~~~"
+    reload_nginx
+    wait
+}
+
+###############################################################################
+
+# If the user has run provided a command, run it instead
+if [ $# -ne 0 ]; then
+	exec "$@"
+fi
+
+cat <<-OEBANNER
+    ███╗   ██╗ ██████╗ ██╗███╗   ██╗██╗  ██╗     ██████╗ ██████╗  ██████╗ ██╗  ██╗██╗   ██╗
+    ████╗  ██║██╔════╝ ██║████╗  ██║╚██╗██╔╝     ██╔══██╗██╔══██╗██╔═══██╗╚██╗██╔╝╚██╗ ██╔╝
+    ██╔██╗ ██║██║  ███╗██║██╔██╗ ██║ ╚███╔╝█████╗██████╔╝██████╔╝██║   ██║ ╚███╔╝  ╚████╔╝
+    ██║╚██╗██║██║   ██║██║██║╚██╗██║ ██╔██╗╚════╝██╔═══╝ ██╔══██╗██║   ██║ ██╔██╗   ╚██╔╝
+    ██║ ╚████║╚██████╔╝██║██║ ╚████║██╔╝ ██╗     ██║     ██║  ██║╚██████╔╝██╔╝ ██╗   ██║
+    ╚═╝  ╚═══╝ ╚═════╝ ╚═╝╚═╝  ╚═══╝╚═╝  ╚═╝     ╚═╝     ╚═╝  ╚═╝ ╚═════╝ ╚═╝  ╚═╝   ╚═╝
+OEBANNER
+
+
+# Error if the DOCKER_HOST socket does not exist
 if [[ $DOCKER_HOST == unix://* ]]; then
 	socket_file=${DOCKER_HOST#unix://}
 	if ! [ -S $socket_file ]; then
@@ -10,13 +89,15 @@ if [[ $DOCKER_HOST == unix://* ]]; then
 			Typically you should run your jwilder/nginx-proxy with: \`-v /var/run/docker.sock:$socket_file:ro\`
 			See the documentation at http://git.io/vZaGJ
 		EOT
-		socketMissing=1
-	fi
-fi
-
-# If the user has run the default command and the socket doesn't exist, fail
-if [ "$socketMissing" = 1 -a "$1" = forego -a "$2" = start -a "$3" = '-r' ]; then
 		exit 1
 	fi
+fi
 
-exec "$@"
+
+trap handle_SIGHUP HUP
+trap handle_SIGUSR1 USR1
+trap "exit 0" TERM
+
+rm /etc/nginx/conf.d/default.conf
+start_docker_gen
+wait

test/test_restart.py

@@ -0,0 +1,34 @@
+import pytest
+import time
+
+
+def test_dockergen_is_running(docker_compose):
+    assert docker_compose.containers.get("reverseproxy").exec_run("pgrep docker-gen") != ''
+
+
+def test_nginx_is_running(docker_compose):
+    assert docker_compose.containers.get("reverseproxy").exec_run("pgrep nginx") != ''
+
+
+def test_nginx_answers_with_503(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://nginx-proxy/")
+    assert r.status_code == 503
+
+
+def test_survive_restart(docker_compose, nginxproxy):
+    docker_compose.containers.get("reverseproxy").restart()
+    time.sleep(2)  # give time to eventually fail
+    assert docker_compose.containers.get("reverseproxy").status == "running"
+
+
+def test_dockergen_is_still_running(docker_compose):
+    assert docker_compose.containers.get("reverseproxy").exec_run("pgrep -c docker-gen") != ''
+
+
+def test_nginx_is_still_running(docker_compose):
+    assert docker_compose.containers.get("reverseproxy").exec_run("pgrep -c nginx") != ''
+
+
+def test_nginx_still_answers_with_503(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://nginx-proxy/")
+    assert r.status_code == 503

test/test_restart.yml

@@ -0,0 +1,5 @@
+reverseproxy:
+  container_name: reverseproxy
+  image: jwilder/nginx-proxy:test
+  volumes:
+    - /var/run/docker.sock:/tmp/docker.sock:ro