From 196f9c8c68661ded8698b6d19d10e1c72e027d48 Mon Sep 17 00:00:00 2001
From: Takumi Sueda <puhitaku@gmail.com>
Date: Tue, 27 Oct 2020 20:14:29 +0900
Subject: [PATCH] Enable APT cache / describe how to debootstrap

---
 .gitignore |  2 ++
 Makefile   |  8 +++++++-
 README.md  | 18 ++++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index e928dc6..9592128 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 env
 debian
+cache/*
+!cache/.gitkeep
diff --git a/Makefile b/Makefile
index 84a0fd3..1e5e401 100644
--- a/Makefile
+++ b/Makefile
@@ -78,7 +78,13 @@ debian:
 		exit 1; \
 	fi
 	mkdir debian
-	sudo debootstrap --arch=armel --foreign buster debian/
+	sudo debootstrap --arch=armel --foreign buster debian/ http://localhost:65432/debian/
 	sudo cp /usr/bin/qemu-arm-static debian/usr/bin/
 	sudo cp ./tools/setup_debian.sh debian/
 	sudo chroot debian /setup_debian.sh
+
+.PHONY:
+aptcache:
+	./tools/aptcache_linux_amd64 \
+		-rule 'local=localhost:65432, remote=ftp.jaist.ac.jp' \
+		-rule 'local=localhost:65433, remote=security.debian.org'
diff --git a/README.md b/README.md
index 4b45708..e530a0e 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,24 @@ Build Linux
 1. Confirm that `linux-brain/arch/arm/boot/zImage` exists.
 
 
+Bootstrap Debian Buster
+-----------------------
+
+1. Partition an SD card into two partitions
+
+    - 1st: FAT32 (vfat), about 100MB
+    - 2st: ext4, fill remaining capacity
+
+1. Run APT cache in background: `make aptcache`
+
+1. Run `make debian`
+
+1. Copy all contents in `./debian` into the 2nd partition in the card.
+
+    - `sudo cp -ar ./debian/* /path/to/your/sd/2nd/partition/`
+    - Please make sure that all attributes are preserved with `-a` flag
+
+
 Watch changes in submodules & auto-build
 ----------------------------------------