Add EXTRA_CONFIG and CONFIG_DISABLE options.

README.md

@@ -45,7 +45,14 @@ variables:
    Cache peers for the squid instance may be specified with multiple CACHE_PEER
    environment variables. The suffix of each is used to determine ordering by
    the unix `sort` function.
-
+ * `EXTRA_CONFIGx`
+   Extra non-specific configuration lines to be appended after the main body of
+   the configuration file. This is a good place for custom ACL parameters.
+ * `CONFIG_DISABLE`
+   Default `no`
+   If set to `yes` then squid configuration templating is disabled entirely, allowing
+   bind mounting the configuration file in manually instead. The certificate and SSL
+   setup still runs normally.
     
 # Example Usage
 The following command line will get you up and running quickly. It presumes

docker-squid/squid.bsh

@@ -43,15 +43,31 @@ chown -R proxy: /var/lib/ssl_db
 #ssl_db
 
 # Set the configuration
-p2 -t /squid.conf.p2 > /etc/squid4/squid.conf
+if [ "$CONFIG_DISABLE" != "yes" ]; then
+    p2 -t /squid.conf.p2 > /etc/squid4/squid.conf
 
-# Parse the cache peer lines from the environment and add them to the
-# configuration
-echo '# CACHE PEERS FROM DOCKER' >> /etc/squid4/squid.conf
-env | grep 'CACHE_PEER' | sort | while read cacheline; do
-    echo "# $cacheline " >> /etc/squid4/squid.conf
-    echo "cache_peer ${!cacheline}" >> /etc/squid4/squid.conf
-done
+    # Parse the cache peer lines from the environment and add them to the
+    # configuration
+    echo '# CACHE PEERS FROM DOCKER' >> /etc/squid4/squid.conf
+    env | grep 'CACHE_PEER' | sort | while read cacheline; do
+        echo "# $cacheline " >> /etc/squid4/squid.conf
+        echo "cache_peer ${!cacheline}" >> /etc/squid4/squid.conf
+    done
+
+    # Parse the extra config lines and append them to the configuration
+    echo '# EXTRA CONFIG FROM DOCKER' >> /etc/squid4/squid.conf
+    env | grep 'EXTRA_CONFIG' | sort | while read extraline; do
+        echo "# $extraline " >> /etc/squid4/squid.conf
+        echo "${!extraline}" >> /etc/squid4/squid.conf
+    done
+else
+    echo "CONFIGURATION TEMPLATING IS DISABLED."
+fi
+
+if [ ! -e /etc/squid4/squid.conf ]; then
+    echo "ERROR: /etc/squid4/squid.conf does not exist. Squid will not work."
+    exit 1
+fi
 
 squid -z -N
 squid -N