When ICON is GIF, extract only first frame

scripts/start-finalExec

@@ -5,13 +5,19 @@
 isDebugging && set -x
 
 if [ -n "$ICON" ]; then
-    if [ ! -e server-icon.png ] || [ "${OVERRIDE_ICON}" == "TRUE" ]; then
+    if [ ! -e server-icon.png ] || isTrue "${OVERRIDE_ICON}"; then
       log "Using server icon from $ICON..."
       # Not sure what it is yet...call it "img"
-      curl -sSL -o /tmp/icon.img $ICON
-      specs=$(identify /tmp/icon.img | awk '{print $2,$3}')
-      if [ "$specs" = "PNG 64x64" ]; then
+      if ! get -o /tmp/icon.img "$ICON"; then
+        log "ERROR: failed to download icon from $ICON"
+        exit 1
+      fi
+      read -r -a specs < <(identify /tmp/icon.img | awk 'NR == 1 { print $2, $3 }')
+      if [ "${specs[0]} ${specs[1]}" = "PNG 64x64" ]; then
         mv /tmp/icon.img /data/server-icon.png
+      elif [ "${specs[0]}" = GIF ]; then
+        log "Converting GIF image to 64x64 PNG..."
+        convert "/tmp/icon.img[0]" -resize 64x64! /data/server-icon.png
       else
         log "Converting image to 64x64 PNG..."
         convert /tmp/icon.img -resize 64x64! /data/server-icon.png

tests/setuponlytests/icon-gif-multiframe/docker-compose.yml

@@ -0,0 +1,22 @@
+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"
+      ICON: http://web/motion-tween-example.gif
+      # the following are only used to speed up test execution
+      TYPE: CUSTOM
+      CUSTOM_SERVER: /servers/fake.jar
+      VERSION: 1.18.1
+    volumes:
+      - ./data:/data
+      - ./fake.jar:/servers/fake.jar

tests/setuponlytests/icon-gif-multiframe/verify.sh

@@ -0,0 +1 @@
+mc-image-helper assert fileExists server-icon.png

tests/setuponlytests/icon-png-atscale/docker-compose.yml

@@ -0,0 +1,22 @@
+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"
+      ICON: http://web/4737386_minecraft_squircle_icon.png
+      # the following are only used to speed up test execution
+      TYPE: CUSTOM
+      CUSTOM_SERVER: /servers/fake.jar
+      VERSION: 1.18.1
+    volumes:
+      - ./data:/data
+      - ./fake.jar:/servers/fake.jar

tests/setuponlytests/icon-png-atscale/verify.sh

@@ -0,0 +1 @@
+mc-image-helper assert fileExists server-icon.png

tests/setuponlytests/icon-png-scale/docker-compose.yml

@@ -0,0 +1,22 @@
+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"
+      ICON: http://web/4737386_minecraft_squircle_icon.png
+      # the following are only used to speed up test execution
+      TYPE: CUSTOM
+      CUSTOM_SERVER: /servers/fake.jar
+      VERSION: 1.18.1
+    volumes:
+      - ./data:/data
+      - ./fake.jar:/servers/fake.jar

tests/setuponlytests/icon-png-scale/verify.sh

@@ -0,0 +1 @@
+mc-image-helper assert fileExists server-icon.png