Monday, May 11, 2020

DSM6: Run services like inetd in Synology debian-chroot

Somehow systemd does not run in the debian-chroot, so in case inetd is working for you, here’s how:
ssh to your synology

sudo -s
chroot /volume1/@appstore/debian-chroot/var/chroottarget /bin/bash
apt install wget tcpd zip unzip openssl lftp openbsd-inetd

Install software of choice. Then:

service openbsd-inetd start
exit

Auto-start the inetd service with the debian-chroot:

sqlite3 /volume1/@appstore/debian-chroot/var/debian-chroot.db
INSERT INTO services VALUES ('0', 'INETD', '/etc/init.d/openbsd-inetd','ps -p $(cat /var/run/inetd.pid)');
.quit

DSM6: Create a Synology x64 debian chroot

1 Install the synology “noarch” package
Go to the Package Center, then Settings
Trusted sources, “Synology Inc. and trusted publishers”
Package Sources, Add, “SynoCommunity” + “http://packages.synocommunity.com/”
Community, install Python (v2.x, not v3) and nano
Manual Install, debian-chroot_noarch-all_8.4-7.spk but DO NOT “Run after installation”

2 Fix the DSM Interface
Ssh to your Synology

sudo -s
cd /volume1/@appstore/debian-chroot/env/bin
./pip install click
nano /var/packages/debian-chroot/target/app/debian-chroot.js

Then replace

"url": "3rdparty/debian-chroot/debian-chroot.cgi/direct/router",
with
"url": "/webman/3rdparty/debian-chroot/debian-chroot.cgi/direct/router",
and:
'url': '3rdparty/debian-chroot/debian-chroot.cgi/direct/poller',
with
'url': '/webman/3rdparty/debian-chroot/debian-chroot.cgi/direct/poller',

And alter the onclose function:

onClose: function () { 
    this.doClose();
    this.mainPanel.onDeactivate();
    return true;
},

3 Replace the binaries with x64
Remove old binaries:

cd /volume1/@appstore/debian-chroot/var
rm -rf chroottarget

Put the x64 chroot.tar.gz in the current directory

tar zxvf chroot.tar.gz
echo "chroot" >/volume1/@appstore/debian-chroot/var/chroottarget/etc/hostname
cp /etc/resolv.conf /volume1/@appstore/debian-chroot/var/chroottarget/etc/resolv.conf
touch /usr/local/debian-chroot/var/installed

If you created a chroot for a different architecture than x64, use the following command. Otherwise skip this.

chroot /volume1/@appstore/debian-chroot/var/chroottarget /debootstrap/debootstrap --second-stage

The chroot is now installed. Start it:

/var/packages/debian-chroot/scripts/start-stop-status start

Enter the chroot:

chroot /volume1/@appstore/debian-chroot/var/chroottarget /bin/bash

Post-installation steps:

apt update && apt upgrade && apt autoremove
apt-get install locales
dpkg-reconfigure locales -> only "[*] en_US.UTF-8 UTF-8" -> system default: en_US.UTF-8
dpkg-reconfigure tzdata -> set correct timezone, e.g. Europe, Amsterdam

Optional
If you want extra mounts in your chroot, look in: 

/var/packages/debian-chroot/scripts/start-stop-status

example to add a Synology share called stuff to the chroot:

add to BOTTOM of all mount commands in section start_daemon script:
        grep -q "${CHROOTTARGET}/mnt/site " /proc/mounts || mount -o bind /volume1/stuff ${CHROOTTARGET}/mnt/site
add to TOP of all umount commands in section stop_daemon script:
        umount ${CHROOTTARGET}/mnt/site

Reboot your synology

Create debian x64 chroot files (for Synology debian-chroot)

On your current installed debian x64 installation:

sudo apt install debootstrap
sudo debootstrap stable chroottarget
sudo tar -cvzf chroot.tar.gz chroottarget

Save the chroot.tar.gz

The above creates a debian chroot. Here’s how to make an Ubuntu one. jammy is currently the latest LTS:

debootstrap jammy chroottarget/ http://archive.ubuntu.com/ubuntu/

If you need to create a chroot for a different architecture, eg armhf, the second command would be:

sudo debootstrap --foreign --arch armhf stable chroottarget