From 9bbd7825ac162897f56aa6b6ec8a79b369db41ba Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@fakecake.org>
Date: Fri, 3 Nov 2023 20:14:55 +0300
Subject: make FPM upstream / web root configurable with envsubst like tt-rss

---
 .docker/web-nginx/Dockerfile | 22 +++++++++++++++++++++-
 .docker/web-nginx/nginx.conf |  8 ++++----
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/.docker/web-nginx/Dockerfile b/.docker/web-nginx/Dockerfile
index 41d8e3f..21b8645 100644
--- a/.docker/web-nginx/Dockerfile
+++ b/.docker/web-nginx/Dockerfile
@@ -1,3 +1,23 @@
 FROM registry.fakecake.org/docker.io/nginx:alpine
 
-COPY .docker/web-nginx/nginx.conf /etc/nginx/nginx.conf
+COPY .docker/web-nginx/nginx.conf /etc/nginx/templates/nginx.conf.template
+
+# By default, nginx will send the php requests to "app" server, but this server
+# name can be overridden at runtime by passing an APP_UPSTREAM env var
+ENV APP_UPSTREAM=${APP_UPSTREAM:-app}
+
+# Webroot (defaults to /var/www/html)
+ENV APP_WEB_ROOT=${APP_WEB_ROOT:-/var/www/html}
+
+# Base location for epube (defaults to /books)
+ENV APP_BASE=${APP_BASE:-/books}
+
+# In order to make epube appear on website root without /books/ set above as follows in .env:
+# APP_WEB_ROOT=/var/www/html/books
+# APP_BASE=
+
+# It's necessary to set the following NGINX_ENVSUBST_OUTPUT_DIR env var to tell
+# nginx to replace the env vars of /etc/nginx/templates/nginx.conf.template
+# and put the result in /etc/nginx/nginx.conf (instead of /etc/nginx/conf.d/nginx.conf)
+# See https://github.com/docker-library/docs/tree/master/nginx#using-environment-variables-in-nginx-configuration-new-in-119
+ENV NGINX_ENVSUBST_OUTPUT_DIR=/etc/nginx
diff --git a/.docker/web-nginx/nginx.conf b/.docker/web-nginx/nginx.conf
index 12d526a..ee297fd 100644
--- a/.docker/web-nginx/nginx.conf
+++ b/.docker/web-nginx/nginx.conf
@@ -18,19 +18,19 @@ http {
 	index index.php;
 
 	upstream app {
-		server app:9000;
+		server ${APP_UPSTREAM}:9000;
 	}
 
 	server {
 		listen 80;
 		listen [::]:80;
-		root /var/www/html;
+		root ${APP_WEB_ROOT};
 
-		location /books/db {
+		location ${APP_BASE}/db {
 			internal;
 		}
 
-		location /books/sessions {
+		location ${APP_BASE}/sessions {
 			internal;
 		}
 
-- 
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