Makefile: Add initial bootstrapping!

I also have the beginnings of building the ports tree, but that has
proven to be more involved than I wanted it to be.  For now we're doing
an "untrusted" pull of the Alpine keys off of the Alpine HTTPS
repository then doing key signing for everything else.  I plan on doing
that phase from the ports tree at a later date, but for now it has
proven too elusive...

GNUmakefile

@@ -1,23 +1,80 @@
+ARCH ?= x86_64
+PLATFORM ?= UEFI
+DESTROOT ?= destroot
+REPO ?= repo
+DOSU ?= sudo
+ALPINE_REPO ?= https://dl-cdn.alpinelinux.org/alpine/latest-stable/main/
+PKGS ?=
+BUSYBOX ?= busybox
+APORTSDIR ?= $(APORTS_MODULE)
+SHELL := /usr/bin/env bash
+
 GIMME_MODULE := git submodule update --init --recursive
+
+ABUILD_MODULE := modules/abuild
 ARCH_MODULE := modules/arch-install-scripts
 APK_MODULE := modules/apk-tools
+APORTS_MODULE := modules/aports
+
+ABUILD_SCRIPT := $(ABUILD_MODULE)/abuild
 APK_BIN := $(APK_MODULE)/src/apk
 
+ABUILD := $(BUSYBOX) ash $(CURDIR)/$(ABUILD_SCRIPT) -c -P $(CURDIR)/$(REPO) rootbld
 ACHROOT := $(ARCH_MODULE)/arch-chroot
 APK := LD_LIBRARY_PATH=$(APK_MODULE)/src $(APK_BIN)
 
-tools: $(ACHROOT) $(APK_BIN)
+### TOOLS ###
+
+tools: $(ACHROOT) $(APK_BIN) $(ABUILD_SCRIPT)
 
 $(ARCH_MODULE)/Makefile: .gitmodules
 	$(GIMME_MODULE) -- $(ARCH_MODULE)
 
 $(ACHROOT): $(ARCH_MODULE)/Makefile
-	$(MAKE) -C $(ARCH_MODULE) arch-chroot
+	$(MAKE) -j -C $(ARCH_MODULE) arch-chroot
 
 $(APK_MODULE)/Makefile: .gitmodules
 	$(GIMME_MODULE) -- $(APK_MODULE)
 
 $(APK_BIN): $(APK_MODULE)/Makefile
-	$(MAKE) -C $(APK_MODULE)
+	$(MAKE) -j -C $(APK_MODULE)
 
-.PHONY: tools
+$(ABUILD_MODULE)/Makefile: .gitmodules
+	$(GIMME_MODULE) -- $(ABUILD_MODULE)
+
+$(ABUILD_SCRIPT): $(ABUILD_MODULE)/Makefile
+	$(MAKE) -j -C $(ABUILD_MODULE) all
+
+### PORTS TREE ###
+
+$(APORTS_MODULE)/README.md: .gitmodules
+	$(GIMME_MODULE) -- $(APORTS_MODULE)
+
+aports: $(APORTS_MODULE)/README.md
+
+### REPO BUILDING ###
+
+# Something will go here...
+
+### INSTALLATION ###
+
+$(DESTROOT):
+	mkdir -p $(DESTROOT) || $(DOSU) mkdir -p $(DESTROOT)
+
+$(DESTROOT)/.bootstrap-done: $(DESTROOT) $(APK_BIN)
+	$(DOSU) $(APK) --arch $(ARCH) -X $(ALPINE_REPO) --root $(DESTROOT) \
+		-U --allow-untrusted --initdb add alpine-keys $(PKGS) && touch $@
+	$(DOSU) $(APK) --arch $(ARCH) -X $(ALPINE_REPO) --root $(DESTROOT) \
+		add alpine-base $(PKGS) && touch $@
+
+bootstrap: $(DESTROOT)/.bootstrap-done
+
+### CLEANLINESS ###
+clean:
+	git submodule deinit -f -- \
+		$(APK_MODULE) $(ABUILD_MODULE) $(APORTS_MODULE) $(ARCH_MODULE)
+	$(DOSU) rm -rf destroot/* repo/*
+
+### MAKEY-MAKEY ###
+
+.PHONY: tools bootstrap aports