Introduce Exclude Fragments option

Allows you to exclude any fragments that get added. 
Good use case: do not deploy litecoin lightning node when using btc lightning

Should also help users with advanced customization scenarios

README.md

@@ -129,6 +129,7 @@ You can read [the article](https://medium.com/@BtcpayServer/hosting-btcpay-serve
 * `BTCPAY_SSHTRUSTEDFINGERPRINTS`: Optional, BTCPay will ensure that it is connecting to the expected SSH server by checking the host's public key against these fingerprints
 * `BTCPAYGEN_DOCKER_IMAGE`: Optional, Specify which generator image to use if you have customized the C# generator. Set to `btcpayserver/docker-compose-generator:local` to build the generator locally at runtime.
 * `BTCPAY_IMAGE`: Optional, Specify which btcpayserver image to use if you have a customized btcpayserver.
+* `BTCPAYGEN_EXCLUDE_FRAGMENTS`:  Semicolon-separated list of fragments you want to forcefully exclude(eg. `litecoin-clightning`)
 
 Additionally, there are specific environment variables for some addons:
 

btcpay-setup.sh

@@ -66,6 +66,7 @@ Environment variables:
 Add-on specific variables:
     LIBREPATRON_HOST: If libre patron is activated with opt-add-librepatron, the hostname of your libre patron website (eg. librepatron.example.com)
     WOOCOMMERCE_HOST: If woocommerce is activated with opt-add-woocommerce, the hostname of your woocommerce website (eg. store.example.com)
+	BTCPAYGEN_EXCLUDE_FRAGMENTS:  Semicolon-separated list of fragments you want to forcefully exclude(eg. litecoin-clightning)
 END
 }
 
@@ -161,6 +162,7 @@ BTCPAYGEN_CRYPTO9:$BTCPAYGEN_CRYPTO9
 BTCPAYGEN_REVERSEPROXY:$BTCPAYGEN_REVERSEPROXY
 BTCPAYGEN_LIGHTNING:$BTCPAYGEN_LIGHTNING
 BTCPAYGEN_ADDITIONAL_FRAGMENTS:$BTCPAYGEN_ADDITIONAL_FRAGMENTS
+BTCPAYGEN_EXCLUDE_FRAGMENTS:$BTCPAYGEN_EXCLUDE_FRAGMENTS
 BTCPAY_IMAGE:$BTCPAY_IMAGE
 ACME_CA_URI:$ACME_CA_URI
 ----------------------
@@ -200,6 +202,7 @@ export BTCPAYGEN_CRYPTO9=\"$BTCPAYGEN_CRYPTO9\"
 export BTCPAYGEN_LIGHTNING=\"$BTCPAYGEN_LIGHTNING\"
 export BTCPAYGEN_REVERSEPROXY=\"$BTCPAYGEN_REVERSEPROXY\"
 export BTCPAYGEN_ADDITIONAL_FRAGMENTS=\"$BTCPAYGEN_ADDITIONAL_FRAGMENTS\"
+export BTCPAYGEN_EXCLUDE_FRAGMENTS=\"$BTCPAYGEN_EXCLUDE_FRAGMENTS\"
 export BTCPAY_DOCKER_COMPOSE=\"$BTCPAY_DOCKER_COMPOSE\"
 export BTCPAY_BASE_DIRECTORY=\"$BTCPAY_BASE_DIRECTORY\"
 export BTCPAY_ENV_FILE=\"$BTCPAY_ENV_FILE\"

build.ps1

@@ -21,6 +21,7 @@ docker run -v "$(Get-Location)\Generated:/app/Generated" `
            -e "BTCPAYGEN_CRYPTO9=$BTCPAYGEN_CRYPTO9" `
            -e "BTCPAYGEN_REVERSEPROXY=$BTCPAYGEN_REVERSEPROXY" `
            -e "BTCPAYGEN_ADDITIONAL_FRAGMENTS=$BTCPAYGEN_ADDITIONAL_FRAGMENTS" `
+           -e "BTCPAYGEN_EXCLUDE_FRAGMENTS=$BTCPAYGEN_EXCLUDE_FRAGMENTS" `
            -e "BTCPAYGEN_LIGHTNING=$BTCPAYGEN_LIGHTNING" `
            -e "BTCPAYGEN_SUBNAME=$BTCPAYGEN_SUBNAME" `
            --rm $BTCPAYGEN_DOCKER_IMAGE

build.sh

@@ -22,6 +22,7 @@ docker run -v "$(pwd)/Generated:/app/Generated" \
            -e "BTCPAYGEN_CRYPTO9=$BTCPAYGEN_CRYPTO9" \
            -e "BTCPAYGEN_REVERSEPROXY=$BTCPAYGEN_REVERSEPROXY" \
            -e "BTCPAYGEN_ADDITIONAL_FRAGMENTS=$BTCPAYGEN_ADDITIONAL_FRAGMENTS" \
+           -e "BTCPAYGEN_EXCLUDE_FRAGMENTS=$BTCPAYGEN_EXCLUDE_FRAGMENTS" \
            -e "BTCPAYGEN_LIGHTNING=$BTCPAYGEN_LIGHTNING" \
            -e "BTCPAYGEN_SUBNAME=$BTCPAYGEN_SUBNAME" \
            --rm $BTCPAYGEN_DOCKER_IMAGE

docker-compose-generator/src/DockerComposition.cs

@@ -27,6 +27,11 @@ namespace DockerGenerator
 			get;
 			set;
 		} = new string[0];
+		public string[] ExcludeFragments
+		{
+			get;
+			set;
+		} = new string[0];
 
 		public static DockerComposition FromEnvironmentVariables()
 		{
@@ -46,6 +51,11 @@ namespace DockerGenerator
 												.Where(t => !string.IsNullOrWhiteSpace(t))
 												.Select(t => t.EndsWith(".yml") ? t.Substring(0, t.Length - ".yml".Length) : t)
 												.ToArray();
+			composition.ExcludeFragments = (Environment.GetEnvironmentVariable("BTCPAYGEN_EXCLUDE_FRAGMENTS") ?? "").ToLowerInvariant()
+												.Split(new char[] { ';' , ',' })
+												.Where(t => !string.IsNullOrWhiteSpace(t))
+												.Select(t => t.EndsWith(".yml") ? t.Substring(0, t.Length - ".yml".Length) : t)
+												.ToArray();
 			return composition;
 		}
 	}

docker-compose-generator/src/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -72,6 +72,7 @@ namespace DockerGenerator
 			{
 				fragments.Add(fragment.Trim());
 			}
+			fragments = fragments.Where(s => !composition.ExcludeFragments.Contains(s)).ToHashSet();
 			var def = new DockerComposeDefinition(name, fragments.ToList());
 			def.FragmentLocation = fragmentLocation;
 			def.BuildOutputDirectory = output;