$PID_FILE, $WATCH_FILE, $DHPARAM_FILE now a thing

README.md

@@ -16,15 +16,21 @@ The image is based on the [`openresty:stretch` docker hub image](https://hub.doc
  - `NO_DHPARAM` (default: unset)  
     if set to string `"true"`, `dhparam` generation will be skipped entirely; this is *not* a good idea, and should be used only for internal/utility nginx instances that run behind another webserver with TLS support.
 
+ - `PID_FILE` (default: "`/usr/local/openresty/nginx/logs/nginx.pid`")
+ - `WATCH_FILE` (default: "`/usr/local/openresty/nginx/logs/logrotate`")
+ - `DHPARAM_FILE` (default: "`/etc/ssl/nginx/dhparam.pem`")
+    these control the locations where the `run.sh` script expects to find the `nginx` pidfile, the file to watch for logrotate signalling, and the SSL DH parameters files; these should reflect `nginx` config.
+
+    
 ## Operation
 
-Upon start it creates a dhparam file in `/etc/ssl/nginx/dhparam.pem` (if the file does not exist) and sets an `inotify` watch on `/srv/logs/nginx/logrotate`. Once the watch discovers that the watchfile has been modified, it sends the `USR1` signal to `nginx`, which causes it to reload the logfiles.
+Upon start it creates a dhparam file in `$DHPARAM_FILE` (if the file does not exist) and sets an `inotify` watch on `$WATCH_FILE`. Once the watch discovers that the watchfile has been modified, it sends the `USR1` signal to `nginx`, which causes it to reload the logfiles.
 
 Use by volume-mounting the watchfile in this container and in a container that logrotate runs in, and making sure logrotate touches/modifies that file, for instance by using the following in your logrotate config files:
 
 ```
 postrotate
-      /bin/date > /srv/logs/nginx/logrotate
+      /bin/date > /usr/local/openresty/nginx/logs/logrotate # or whatever is in $WATCH_FILE
 ```
 
 ## ToDo

run.sh

@@ -23,13 +23,13 @@
 
 # yes, this is dead-simple; just watch this file,
 # and if it gets modified, send nginx the signal
-WATCH_FILE="/usr/local/openresty/nginx/logs/logrotate"
+[ -z $WATCH_FILE ] && WATCH_FILE="/usr/local/openresty/nginx/logs/logrotate"
 
 # we need this for signal sending
-PID_FILE="/usr/local/openresty/nginx/logs/nginx.pid"
+[ -z $PID_FILE ] && PID_FILE="/usr/local/openresty/nginx/logs/nginx.pid"
 
-# we need this for DHParram generation
-DHPARAM_FILE="/etc/ssl/nginx/dhparam.pem"
+# we need this for dhparam generation
+[ -z $DHPARAM_FILE ] && DHPARAM_FILE="/etc/ssl/nginx/dhparam.pem"
 
 # this waits for changes in $WATCH_FILE and sends nginx a USR1 signal to reload the logfiles
 function watch_logfiles {