+case $(debian-codename) in
+ # needed for debootstrap scripts for fai since fai requires debian
+ flidas)
+ curl http://archive.ubuntu.com/ubuntu/project/ubuntu-archive-keyring.gpg | s apt-key add -
+ s dd of=/etc/apt/preferences.d/flidas-xenial <<EOF
+Package: *
+Pin: release a=xenial
+Pin-Priority: -100
+
+Package: *
+Pin: release a=xenial-updates
+Pin-Priority: -100
+
+Package: *
+Pin: release a=xenial-security
+Pin-Priority: -100
+EOF
+ s dd of=/etc/apt/sources.list.d/xenial.list 2>/dev/null <<EOF
+deb http://us.archive.ubuntu.com/ubuntu/ xenial main
+deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main
+deb http://us.archive.ubuntu.com/ubuntu/ xenial-security main
+EOF
+
+ s apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
+ s dd of=/etc/apt/preferences.d/flidas-bionic <<EOF
+Package: *
+Pin: release a=bionic
+Pin-Priority: -100
+
+Package: *
+Pin: release a=bionic-updates
+Pin-Priority: -100
+
+Package: *
+Pin: release a=bionic-security
+Pin-Priority: -100
+EOF
+
+ # better to run btrfs-progs which matches our kernel version
+ # (note, renamed from btrfs-tools)
+ s dd of=/etc/apt/preferences.d/btrfs-progs <<EOF
+Package: btrfs-progs libzstd1
+Pin: release a=bionic
+Pin-Priority: 1005
+
+Package: btrfs-progs libzstd1
+Pin: release a=bionic-updates
+Pin-Priority: 1005
+
+Package: btrfs-progs libzstd1
+Pin: release a=bionic-security
+Pin-Priority: 1005
+EOF
+
+
+ t=$(mktemp)
+ cat >$t <<EOF
+deb http://us.archive.ubuntu.com/ubuntu/ bionic main
+deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main
+deb http://us.archive.ubuntu.com/ubuntu/ bionic-security main
+EOF
+ f=/etc/apt/sources.list.d/bionic.list
+ if ! diff -q $t $f; then
+ s cp $t $f
+ s chmod 644 $f
+ p update
+ fi
+
+ # no special reason, but its better for btrfs-progs to
+ # be closer to our kernel version
+ pi btrfs-progs
+
+ t=$(mktemp -d)
+ cd $t
+ aptitude download debootstrap/xenial
+ ex *
+ ex data.tar.gz
+ s cp ./usr/share/debootstrap/scripts/* /usr/share/debootstrap/scripts
+
+ ;;
+esac
+
+# /run and /dev/shm are listed as required for pulseaudio. All 4 in the group
+# listed in the default config as suggested.
+# /run/usr/1000 i noticed was missing for pulseaudio
+# /run/user/0 just seemed like a not bad idea, given the above
+tu /etc/schroot/desktop/fstab <<'EOF'
+/run /run none rw,bind 0 0
+/run/lock /run/lock none rw,bind 0 0
+/dev/shm /dev/shm none rw,bind 0 0
+/run/shm /run/shm none rw,bind 0 0
+/run/user/1000 /run/user/1000 none rw,bind 0 0
+/run/user/1001 /run/user/1001 none rw,bind 0 0
+/run/user/0 /run/user/0 none rw,bind 0 0
+EOF
+
+mkschroot() {
+ distro=$1
+ shift
+ case $distro in
+ ubuntu)
+ repo=http://archive.ubuntu.com/ubuntu/
+ ;;
+ debian)
+ repo=http://deb.debian.org/debian/
+ ;;
+ esac
+ n=$1
+ shift
+ if schroot -l | grep -xFq chroot:$n; then
+ echo "$0: $n schroot already installed, skipping"
+ return 0
+ fi
+ apps=($@)
+ d=/nocow/schroot/$n
+ s dd of=/etc/schroot/chroot.d/$n.conf <<EOF
+[$n]
+description=$n
+type=directory
+directory=$d
+profile=desktop
+preserve-environment=true
+users=$USER,traci
+EOF
+ if [[ -e $d/bin ]]; then
+ s chroot $d apt-get update
+ s chroot $d apt-get -y dist-upgrade --purge --auto-remove
+ cd; s schroot -c $n -- apt-get install --allow-unauthenticated -y ${apps[@]}
+ else
+ s mkdir -p $d
+
+ s debootstrap $n $d $repo
+ cd; s schroot -c $n -- apt-get install --allow-unauthenticated -y ${apps[@]}
+ fi
+ s cp -P {,$d}/etc/localtime
+}
+s dd of=/etc/systemd/system/schrootupdate.service <<'EOF'
+[Unit]
+Description=schrootupdate
+After=multi-user.target
+
+[Service]
+Type=oneshot
+ExecStart=/a/bin/log-quiet/sysd-mail-once schrootupdate /a/bin/distro-setup/schrootupdate
+EOF
+s dd of=/etc/systemd/system/schrootupdate.timer <<'EOF'
+[Unit]
+Description=schrootupdate
+
+[Timer]
+OnCalendar=*-*-* 04:20:00
+
+[Install]
+WantedBy=timers.target
+EOF
+s systemctl daemon-reload
+sgo schrootupdate.timer
+