Use qcow for BaseSystem.img instead because it sheds 2G off image size. Add back in stock OpenCore bootdisks; size negligible after removing cache.

Dockerfile

@@ -147,7 +147,9 @@ WORKDIR /home/arch/OSX-KVM
 
 ARG SHORTNAME=catalina
 
-RUN make
+RUN make \
+    && qemu-img convert BaseSystem.dmg -O qcow2 -p -c BaseSystem.img \
+    && rm ./BaseSystem.dmg
 
 ARG LINUX=true
 
@@ -182,7 +184,7 @@ RUN touch Launch.sh \
     && tee -a Launch.sh <<< '-smbios type=2 \' \
     && tee -a Launch.sh <<< '-audiodev ${AUDIO_DRIVER:-alsa},id=hda -device ich9-intel-hda -device hda-duplex,audiodev=hda \' \
     && tee -a Launch.sh <<< '-device ich9-ahci,id=sata \' \
-    && tee -a Launch.sh <<< '-drive id=OpenCoreBoot,if=none,snapshot=on,format=qcow2,file=${BOOTDISK:-/home/arch/OSX-KVM/OpenCore/OpenCore.qcow2} \' \
+    && tee -a Launch.sh <<< '-drive id=OpenCoreBoot,if=none,snapshot=on,format=${BASESYSTEM_FORMAT},file=${BOOTDISK:-/home/arch/OSX-KVM/OpenCore/OpenCore.qcow2} \' \
     && tee -a Launch.sh <<< '-device ide-hd,bus=sata.2,drive=OpenCoreBoot \' \
     && tee -a Launch.sh <<< '-device ide-hd,bus=sata.3,drive=InstallMedia \' \
     && tee -a Launch.sh <<< '-drive id=InstallMedia,if=none,file=/home/arch/OSX-KVM/BaseSystem.img,format=raw \' \
@@ -285,6 +287,11 @@ RUN ln -s /home/arch/OSX-KVM/OpenCore /home/arch/OSX-KVM/OpenCore-Catalina || tr
 # for example, -e ADDITIONAL_PORTS=hostfwd=tcp::23-:23,
 ENV ADDITIONAL_PORTS=
 
+# since the Makefile uses raw, and raw uses the full disk amount
+# we want to use a compressed qcow2
+# ENV BASESYSTEM_FORMAT=raw
+ENV BASESYSTEM_FORMAT=qcow2
+
 # add additional QEMU boot arguments
 ENV BOOT_ARGS=
 

Dockerfile.naked

@@ -243,29 +243,29 @@ ARG STOCK_MASTER_PLIST_URL_NOPICKER=https://raw.githubusercontent.com/sickcodes/
 ARG STOCK_BOOTDISK=/home/arch/OSX-KVM/OpenCore/OpenCore.qcow2
 ARG STOCK_BOOTDISK_NOPICKER=/home/arch/OSX-KVM/OpenCore/OpenCore-nopicker.qcow2
 
-# RUN ./Docker-OSX/osx-serial-generator/generate-specific-bootdisk.sh \
+RUN ./Docker-OSX/osx-serial-generator/generate-specific-bootdisk.sh \
-#     --master-plist-url="${STOCK_MASTER_PLIST_URL}" \
+    --master-plist-url="${STOCK_MASTER_PLIST_URL}" \
-#     --model "${STOCK_DEVICE_MODEL}" \
+    --model "${STOCK_DEVICE_MODEL}" \
-#     --serial "${STOCK_SERIAL}" \
+    --serial "${STOCK_SERIAL}" \
-#     --board-serial "${STOCK_BOARD_SERIAL}" \
+    --board-serial "${STOCK_BOARD_SERIAL}" \
-#     --uuid "${STOCK_UUID}" \
+    --uuid "${STOCK_UUID}" \
-#     --mac-address "${STOCK_MAC_ADDRESS}" \
+    --mac-address "${STOCK_MAC_ADDRESS}" \
-#     --width "${STOCK_WIDTH}" \
+    --width "${STOCK_WIDTH}" \
-#     --height "${STOCK_HEIGHT}" \
+    --height "${STOCK_HEIGHT}" \
-#     --output-bootdisk "${STOCK_BOOTDISK}" || exit 1 \
+    --output-bootdisk "${STOCK_BOOTDISK}" || exit 1 \
-#     ; rm -rf /var/tmp/.guestfs-*
+    ; rm -rf /var/tmp/.guestfs-*
-
+
-# RUN ./Docker-OSX/osx-serial-generator/generate-specific-bootdisk.sh \
+RUN ./Docker-OSX/osx-serial-generator/generate-specific-bootdisk.sh \
-#     --master-plist-url="${STOCK_MASTER_PLIST_URL_NOPICKER}" \
+    --master-plist-url="${STOCK_MASTER_PLIST_URL_NOPICKER}" \
-#     --model "${STOCK_DEVICE_MODEL}" \
+    --model "${STOCK_DEVICE_MODEL}" \
-#     --serial "${STOCK_SERIAL}" \
+    --serial "${STOCK_SERIAL}" \
-#     --board-serial "${STOCK_BOARD_SERIAL}" \
+    --board-serial "${STOCK_BOARD_SERIAL}" \
-#     --uuid "${STOCK_UUID}" \
+    --uuid "${STOCK_UUID}" \
-#     --mac-address "${STOCK_MAC_ADDRESS}" \
+    --mac-address "${STOCK_MAC_ADDRESS}" \
-#     --width "${STOCK_WIDTH}" \
+    --width "${STOCK_WIDTH}" \
-#     --height "${STOCK_HEIGHT}" \
+    --height "${STOCK_HEIGHT}" \
-#     --output-bootdisk "${STOCK_BOOTDISK_NOPICKER}" || exit 1 \
+    --output-bootdisk "${STOCK_BOOTDISK_NOPICKER}" || exit 1 \
-#     ; rm -rf /var/tmp/.guestfs-*
+    ; rm -rf /var/tmp/.guestfs-*
 
 
 WORKDIR /home/arch/OSX-KVM