1 files changed, 16 insertions, 4 deletions

diff --git a/partitions/Makefile b/partitions/Makefile
index f8ef259..1e40c07 100644
--- a/partitions/Makefile
+++ b/partitions/Makefile
@@ -9,22 +9,34 @@ whole.img:
 key.img:
         partvi key
 
+persist.img:
+        [ ! -e $@ ]
+        fallocate -l 20G $@
+        truncate -s 0 $@
+        truncate -s 20G $@
+
+persist := $(shell [ -e persist.img ] && printf %s '-drive file=persist.img,media=disk,driver=raw' || true)
+
 .PHONY: usb emu key emu-key keymu
 usb: whole.img
         usb=$$(usb) && sudo dd status=progress if="$<" of="$$usb"
 
-emu = qemu-system-x86_64 -m 800 -enable-kvm -boot c
+define emu
+        qemu-system-x86_64 -m 800 -enable-kvm -boot c \
+          -drive file=$(1),media=disk,driver=raw \
+          $(persist)
+endef
 
 emu: whole.img
-        $(emu) $<
+        $(call emu,$<)
 
 emu-key keymu: key.img
-        $(emu) $<
+        $(call emu,$<)
 
 key: key.img
         usb=$$(usb) && \
                 sudo dd status=progress bs=1048576 if="$<" of="$$usb" && \
-                sudo $(emu) "$$usb"
+                sudo "$(call emu,"$$usb")"
 
 clean:
         rm -rf _build whole.img key.img