From 56d79696fbe149e4e54e2bcb2e2c04a0f3743e30 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@cryptonomic.net>
Date: Sun, 28 Feb 2021 07:33:45 -0500
Subject: emu support for persist.img

---
 partitions/Makefile | 20 ++++++++++++++++----
 1 file 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
-- 
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