feat: added prefix/suffix support for GENERIC_PACKS (#1321)

For #1315

README.md

@@ -798,11 +798,21 @@ Example of expected ForgeAPI file format.
 ]
 ```
 
-### Generic pack file
+### Generic pack files
 
-To install all of the server content (jars, mods, plugins, configs, etc) from a zip file, such as a CurseForge modpack that is missing a server start script, then set `GENERIC_PACK` to the container path of the zip file. That, combined with `TYPE`, allows for custom content along with container managed server download and install.  
+To install all of the server content (jars, mods, plugins, configs, etc) from a zip or tgz file, such as a CurseForge modpack that is missing a server start script, then set `GENERIC_PACK` to the container path or URL of the archive file.
 
-If multiple generic packs need to be applied together, set `GENERIC_PACKS` instead, with a comma separated list of zip file paths and/or URLs to zip files.
+If multiple generic packs need to be applied together, set `GENERIC_PACKS` instead, with a comma separated list of archive file paths and/or URLs to files.
+
+To avoid repetition, each entry will be prefixed by the value of `GENERIC_PACKS_PREFIX` and suffixed by the value of `GENERIC_PACKS_SUFFIX`, both of which are optional. For example, the following variables
+
+```
+GENERIC_PACKS=configs-v9.0.1,mods-v4.3.6
+GENERIC_PACKS_PREFIX=https://cdn.example.org/
+GENERIC_PACKS_SUFFIX=.zip
+```
+
+would expand to `https://cdn.example.org/configs-v9.0.1.zip,https://cdn.example.org/mods-v4.3.6.zip`.
 
 ### Mod/Plugin URL Listing File 
 

scripts/start-setupModpack

@@ -188,13 +188,16 @@ esac
 fi
 
 : "${GENERIC_PACKS:=${GENERIC_PACK}}"
+: "${GENERIC_PACKS_PREFIX:=}"
+: "${GENERIC_PACKS_SUFFIX:=}"
 
 if [[ "${GENERIC_PACKS}" ]]; then
   IFS=',' read -ra packs <<< "${GENERIC_PACKS}"
 
   packFiles=()
-  for pack in "${packs[@]}"; do
-    if isURL "$pack"; then
+  for packEntry in "${packs[@]}"; do
+    pack="${GENERIC_PACKS_PREFIX}${packEntry}${GENERIC_PACKS_SUFFIX}"
+    if isURL "${pack}"; then
       mkdir -p /data/packs
       if ! outfile=$(get -o /data/packs --output-filename --skip-existing "$pack"); then
         log "ERROR: failed to download $pack"

tests/setuponlytests/generic-packs-prefix/docker-compose.yml

@@ -0,0 +1,14 @@
+version: "3"
+
+services:
+  mc:
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "true"
+      SETUP_ONLY: "TRUE"
+      GENERIC_PACKS: testing
+      GENERIC_PACKS_PREFIX: /packs/
+      GENERIC_PACKS_SUFFIX: .zip
+    volumes:
+      - ./packs:/packs
+      - ./data:/data

tests/setuponlytests/generic-packs-prefix/verify.sh

@@ -0,0 +1 @@
+mc-image-helper assert fileExists one.txt mods/two.txt

tests/setuponlytests/generic-packs/docker-compose.yml

@@ -1,12 +1,18 @@
 version: "3"
 
 services:
+  web:
+    image: nginx
+    volumes:
+      - ./web:/usr/share/nginx/html
   mc:
+    depends_on:
+      - web
     image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
     environment:
       EULA: "true"
       SETUP_ONLY: "TRUE"
-      GENERIC_PACKS: https://github.com/itzg/mc-image-helper/releases/download/v1.9.5/mc-image-helper-1.9.5.zip,/packs/testing.zip
+      GENERIC_PACKS: http://web/configs.zip,/packs/testing.zip
     volumes:
       - ./packs:/packs
       - ./data:/data

tests/setuponlytests/generic-packs/verify.sh

@@ -1 +1,2 @@
-mc-image-helper assert fileExists one.txt mods/two.txt
+mc-image-helper assert fileExists one.txt mods/two.txt
+mc-image-helper assert fileExists one.txt config/opt.yml