Allow ICON to reference a local file

scripts/start-finalExec

@@ -7,20 +7,33 @@ isDebugging && set -x
 if [ -n "$ICON" ]; then
     if [ ! -e server-icon.png ] || isTrue "${OVERRIDE_ICON}"; then
       log "Using server icon from $ICON..."
-      # Not sure what it is yet...call it "img"
-      if ! get -o /tmp/icon.img "$ICON"; then
-        log "ERROR: failed to download icon from $ICON"
+      if isURL "$ICON"; then
+        # Not sure what it is yet...call it "img"
+        if ! get -o /tmp/icon.img "$ICON"; then
+          log "ERROR: failed to download icon from $ICON"
+          exit 1
+        fi
+        ICON=/tmp/icon.img
+        iconSrc="url"
+      elif [ -f "$ICON" ]; then
+        iconSrc="file"
+      else
+        log "ERROR: $ICON does not appear to be a URL or existing file"
         exit 1
       fi
-      read -r -a specs < <(identify /tmp/icon.img | awk 'NR == 1 { print $2, $3 }')
+      read -r -a specs < <(identify "$ICON" | awk 'NR == 1 { print $2, $3 }')
       if [ "${specs[0]} ${specs[1]}" = "PNG 64x64" ]; then
-        mv /tmp/icon.img /data/server-icon.png
+        if [ $iconSrc = url ]; then
+          mv -f /tmp/icon.img /data/server-icon.png
+        else
+          cp -f "$ICON" /data/server-icon.png
+        fi
       elif [ "${specs[0]}" = GIF ]; then
         log "Converting GIF image to 64x64 PNG..."
-        convert "/tmp/icon.img[0]" -resize 64x64! /data/server-icon.png
+        convert "$ICON"[0] -resize 64x64! /data/server-icon.png
       else
         log "Converting image to 64x64 PNG..."
-        convert /tmp/icon.img -resize 64x64! /data/server-icon.png
+        convert "$ICON" -resize 64x64! /data/server-icon.png
       fi
     fi
 fi

tests/setuponlytests/icon-file-exact/docker-compose.yml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+  mc:
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "true"
+      SETUP_ONLY: "true"
+      ICON: /extra/4737386_minecraft_squircle_icon_64x64.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
+      - ./extra:/extra
+      - ./fake.jar:/servers/fake.jar

tests/setuponlytests/icon-file-exact/verify.sh

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

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

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+  mc:
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "true"
+      SETUP_ONLY: "true"
+      ICON: /extra/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
+      - ./extra:/extra
+      - ./fake.jar:/servers/fake.jar

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

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