🐛 Add haproxy.cfg for 2.x versions

Build will check which one is installed and only enable the correct
one.

See also guysoft#711

src/modules/octopi/filesystem/root/etc/haproxy/haproxy.2.x.cfg

@@ -0,0 +1,49 @@
+global
+        maxconn 4096
+        user haproxy
+        group haproxy
+        log /dev/log local1 debug
+        tune.ssl.default-dh-param 2048
+
+defaults
+        log     global
+        mode    http
+        compression algo gzip
+        option  httplog
+        option  dontlognull
+        retries 3
+        option redispatch
+        option http-server-close
+        option forwardfor
+        maxconn 2000
+        timeout connect 5s
+        timeout client  15min
+        timeout server  15min
+
+frontend public
+        bind :::80 v4v6
+        bind :::443 v4v6 ssl crt /etc/ssl/snakeoil.pem
+        option forwardfor except 127.0.0.1
+        use_backend webcam if { path_beg /webcam/ }
+        use_backend webcam_hls if { path_beg /hls/ }
+        use_backend webcam_hls if { path_beg /jpeg/ }
+        default_backend octoprint
+
+backend octoprint
+        acl needs_scheme req.hdr_cnt(X-Scheme) eq 0
+
+        http-request replace-path ^([^\ :]*)\ /(.*) \1\ /\2
+        http-request add-header X-Scheme https if needs_scheme { ssl_fc }
+        http-request add-header X-Scheme http if needs_scheme !{ ssl_fc }
+        option forwardfor
+        server octoprint1 127.0.0.1:5000
+        errorfile 503 /etc/haproxy/errors/503-no-octoprint.http
+
+backend webcam
+        http-request replace-path /webcam/(.*) /\1
+        server webcam1  127.0.0.1:8080
+        errorfile 503 /etc/haproxy/errors/503-no-webcam.http
+
+backend webcam_hls
+        server webcam_hls_1 127.0.0.1:28126
+        errorfile 503 /etc/haproxy/errors/503-no-webcam-hls.http

src/modules/octopi/start_chroot_script

@@ -227,6 +227,15 @@ fi
 if [ "$OCTOPI_INCLUDE_HAPROXY" == "yes" ]
 then
   systemctl_if_exists enable gencert.service
+
+  haproxy_version=$(dpkg -s haproxy | grep '^Version:' | awk '{print $2}')
+  if [[ $haproxy_version = 2.* ]]; then
+    mv /etc/haproxy/haproxy.2.x.cfg /etc/haproxy/haproxy.cfg
+    rm /etc/haproxy/haproxy.1.x.cfg
+  else
+    mv /etc/haproxy/haproxy.1.x.cfg /etc/haproxy/haproxy.cfg
+    rm /etc/haproxy/haproxy.2.x.cfg
+  fi
 else
   # let's remove the configs for system services we don't need
   rm /etc/systemd/system/gencert.service