generate squashfs during build

.gitignore

@@ -1,2 +1,3 @@
 /fw/*/build
 /fw/*/sdkconfig.old
+/assets/doom.squashfs

Makefile

@@ -1,4 +1,20 @@
 SHELL=/bin/bash
 .PHONY: default
-default:
+default: assets/doom.squashfs
 	. esp-idf/export.sh && cd fw/s3-boy-doom && idf.py set-target esp32s3 && idf.py build && cd build && esptool.py --chip esp32s3 merge_bin -t 0 --output s3-boy-doom-combined.bin `tail -n +2 flash_args` 0x110000 ../../../assets/doom.squashfs
+
+.PHONY: squash
+squash: assets/doom.squashfs
+assets/doom.squashfs: assets/doom-root/doom/doom1.wad Makefile
+	mksquashfs assets/doom-root $@ -noappend \
+		-all-root -no-exports -no-sparse -no-xattrs -all-time 1 -noI \
+		-b 32k -comp gzip -Xwindow-size 14 \
+
+.PHONY: flash-squash
+ifneq ($(origin PORT),undefined)
+P_PORT=-p $(PORT)
+else
+P_PORT=
+endif
+flash-squash: assets/doom.squashfs
+	esptool.py $(P_PORT) write_flash 0x110000 $<