From 81b23d75d873cbabc086729022a4b9b4f3d22a66 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 12 Sep 2022 12:23:08 +0200
Subject: Add support for aarch64

---
 bootstrap | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 53 insertions(+), 13 deletions(-)

(limited to 'bootstrap')

diff --git a/bootstrap b/bootstrap
index c202e4c..b32a931 100755
--- a/bootstrap
+++ b/bootstrap
@@ -4,6 +4,8 @@
 #
 # Assumptions/expectations:
 #
+# - Bootstrapping for the host CPU (currently x86_64 or aarch64).
+#
 # - Host debootstrap/debian-archive-keyring matching release.
 #
 # - /btrfs/<user> is a btrfs directory where the current user can create
@@ -32,6 +34,20 @@ id="$(id -un)"
 btrfs=/btrfs
 root="$btrfs/$id/buildos"
 
+arch="$(uname -m)"
+
+case "$arch" in
+  x86_64)
+    debian_arch=amd64
+    ;;
+  aarch64)
+    debian_arch=arm64
+    ;;
+  *)
+    error "unsupported architecture: $arch"
+    ;;
+esac
+
 # Source distribution and packages. Base packages are installed on stage 1 via
 # debootstrap. Extra packages are added on stage 4 via apt-get install. The
 # idea is to be able to add extra packages without upgrading the base system.
@@ -42,7 +58,7 @@ root="$btrfs/$id/buildos"
 #  - some packages (such as CPU microcode updates) are in non-free.
 #  - systemd-container seems to be required by host systemd-nspawn.
 #  - must explicitly select between dbus and dbus-broker
-#  - not installing linux-image-amd64 since building custom below
+#  - not installing linux-image-* since building custom below
 #
 release="testing"
 components="main,contrib,non-free"
@@ -52,8 +68,7 @@ mirror="http://http.us.debian.org/debian/"
 base_pkgs="locales,klibc-utils,sudo"
 base_pkgs+=",udev,dbus,systemd-timesyncd,systemd-container"
 base_pkgs+=",kmod,linux-base,firmware-linux-free,irqbalance"
-base_pkgs+=",intel-microcode"  #,amd64-microcode
-base_pkgs+=",pciutils,usbutils,dmidecode,cpuid"
+base_pkgs+=",pciutils,usbutils,dmidecode"
 base_pkgs+=",hdparm,btrfs-progs"
 base_pkgs+=",lm-sensors,smartmontools,linux-cpupower"
 
@@ -66,10 +81,20 @@ base_pkgs+=",tftp-hpa,tftpd-hpa"
 
 base_pkgs+=",zstd,xz-utils"
 base_pkgs+=",less,nano,time"
+base_pkgs+=",g++,make"
 
-base_pkgs+=",qemu-system-x86,qemu-utils,socat"
+base_pkgs+=",qemu-utils,socat"
 
-base_pkgs+=",g++,make"
+case "$arch" in
+  x86_64)
+    base_pkgs+=",cpuid"
+    base_pkgs+=",intel-microcode"  #,amd64-microcode
+    base_pkgs+=",qemu-system-x86"
+    ;;
+  aarch64)
+    base_pkgs+=",qemu-system-arm"
+    ;;
+esac
 
 extra_pkgs=""
 
@@ -212,7 +237,7 @@ if [ "$stage" -eq "1" ]; then
 
   sudo debootstrap \
     --foreign \
-    --arch=amd64 \
+    --arch="$debian_arch" \
     --merged-usr \
     --variant=minbase \
     --components="$components" \
@@ -256,9 +281,18 @@ rm /etc/localtime
 
 # Both nspawn and debootstrap try to mount /proc /sys (Debian bug#840372).
 #
-mkdir /tmp/proc /tmp/sys
-mount --move /proc /tmp/proc
-mount --move /sys /tmp/sys
+# @@ TMP this now causes issues with newer systemd.
+#
+#mkdir /tmp/proc /tmp/sys
+#mount --move /proc /tmp/proc
+#mount --move /sys /tmp/sys
+
+# systemd-nspawn "helpfully" creates a /lib64 symlink that then trips
+# up is-usr-merged package (Debain bug #1019575).
+#
+if [ $arch = aarch64 ]; then
+  rm /lib64
+fi
 
 # Run second stage of debootstrap.
 #
@@ -425,7 +459,7 @@ apt-get install -y dwarves
 cd /usr/src
 tar xf linux-source-*
 mv linux-source-*/ linux
-xzcat linux-config-*/config.amd64_none_amd64.xz >linux/.config
+xzcat linux-config-*/config.${debian_arch}_none_${debian_arch}.xz >linux/.config
 cd linux
 
 # Adjust configuration.
@@ -449,6 +483,12 @@ scripts/config --disable INIT_STACK_ALL_ZERO
 scripts/config --enable  DEBUG_INFO_NONE
 scripts/config --disable DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 
+# aarch64/5.19 additions:
+#
+scripts/config --disable KCOV
+scripts/config --disable SHADOW_CALL_STACK
+scripts/config --disable VIDEO_ADV7511
+
 # Disable sound subsystem/drivers.
 #
 sed -i -re '/^CONFIG_SND_.+/d' .config
@@ -660,12 +700,12 @@ etc/systemd/system/multi-user.target.wants/buildos.service
 EOF
   cd "$owd"
 
-  cat buildos-rootfs.cpio.gz buildos-init.cpio.gz >buildos-initrd
+  cat buildos-rootfs.cpio.gz buildos-init.cpio.gz >"buildos-initrd-$arch"
 
   # Copy the kernel image next to the initramfs for convenience.
   #
-  cp "$root/vmlinuz" buildos-image
-  echo "$buildid" >buildos-buildid
+  cp "$root/vmlinuz" "buildos-image-$arch"
+  echo "$buildid" >"buildos-buildid-$arch"
 
   subvol_snapshot -r "$root" "$root-6"
 fi
-- 
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