Can't get disnix to work on Ubuntu 14.04 LTS

[matthiasbeyer]

So I installed things on a Ubuntu 14.04 LTS VM:

sudo apt-get update -y
sudo apt-get upgrade -y
sudo apt-get install htop curl -y

curl https://nixos.org/nix/install | sh
. /home/clouduser/.nix-profile/etc/profile.d/nix.sh

nix-env -i $(nix-build -E 'with import <nixpkgs> {}; dysnomia.override { jobTemplate = "direct"; }')
nix-env -f '<nixpkgs>' -iA disnix

sudo cp /nix/var/nix/profiles/default/etc/dbus-1/system.d/disnix.conf /etc/dbus-1/system.d/
sudo cp /nix/var/nix/profiles/default/share/doc/disnix/disnix-service.initd /etc/init.d/

sudo mv /etc/init.d/disnix-service.initd /etc/init.d/disnix
sudo chmod +x /etc/init.d/disnix

osrel() {
    cat /etc/os-release | grep -E "$1"
}

if [[ $(osrel "^NAME=" | grep Debian) ]]; then
    sudo systemctl daemon-reload
elsif [[ $(osrel "^NAME=" | grep Ubuntu) ]]; then
    if [[ $(osrel "^VERSION_ID" | cut -d "=" -f 2) =~ '"14.04"' ]];
    then
        sudo initctl reload-configuration
    else
        echo "NOT SUPPORTED: $(osrel "^VERSION_ID")"
        exit 1
    fi
fi


for n in 2 3 4 5; do
    sudo ln -s /etc/init.d/disnix-service.initd /etc/rc${n}.d/S06disnix-service;
done

sudo vim /etc/dbus-1/system.d/disnix.conf
sudo vim /etc/init.d/disnix

sudo chmod a+w /var/run
sudo /etc/init.d/disnix start
sudo /etc/init.d/disnix status

echo "DONE"

And it seems that the call to sudo /etc/init.d/disnix start somehow failed (status returns nothing and gives exit code 3).

@svanderburg thinks that the dbus name gets lost somewhere.

With this patch applied (git diff):

diff --git a/src/dbus-service/disnix-service.c b/src/dbus-service/disnix-service.c
index 288d7b9..c279524 100644
--- a/src/dbus-service/disnix-service.c
+++ b/src/dbus-service/disnix-service.c
@@ -84,6 +84,12 @@ static void on_name_acquired(GDBusConnection *connection, const gchar *name, gpo
 static void on_name_lost(GDBusConnection *connection, const gchar *name, gpointer user_data)
 {
     g_printerr("Name lost: %s\n", name);
+
+       if (connection == NULL)
+               g_printerr("No D-Bus connection has been established!\n");
+       else
+               g_printerr("A D-Bus connection seems to have been established!\n");
+
     exit(1);
 }

I get the following output:

$ ./result/bin/disnix-service 
The Disnix service is running!
Name lost: org.nixos.disnix.Disnix
A D-Bus connection seems to have been established

So at least something seems to work.

I'm not sure where the actual error is located, though.

[svanderburg]

I installed a Ubuntu 14.04 LTS image myself and everything seems to work fine.

I suspect this is a problem lies with glib or dbus, or a combination of both, and maybe newer versions have solved it.

In my attempt, I installed the very latest versions of the packages and used the latest unstable Nixpkgs version.

[tomberek]

Happens with QEMU NixOS images as well on intial build. Works fine after a reboot.

[tomberek]

This setup helped by get to a position where disnix/dysnomia starts to work on ubuntu. I'm sure some of it isn't required, but it's a start.

#!/usr/bin/env bash                                                                                          
                                                                                                             
#Install basic stuff
sudo apt install -y curl openssh-server                                                                      
                                                                                                             
#Get Nix                                                                                                     
if ! command -v nix 2>/dev/null ; then                                                                       
    yes | bash <(curl https://nixos.org/nix/install) --daemon                                                
fi                                                                                                           
. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh                                                  
                                                                                                             
# Ensure multi-user nix is in PATH                                                                           
sudo tee /etc/environment <<EOF                                                                              
PATH="/nix/var/nix/profiles/default/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"        
LANG="en_US.UTF-8"
EOF
sudo tee /etc/bash.bashrc <<EOF
if [ -e '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh' ];then                                   
  . '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'                                              
fi
EOF

# Install disnix
sudo -Hi nix-env -iA nixpkgs.disnix nixpkgs.dysnomia
sudo ln -s /etc/systemd /etc/systemd-mutable
sudo cp /nix/var/nix/profiles/default/etc/dbus-1/system.d/disnix.conf /etc/dbus-1/system.d/.                 

sudo tee /etc/systemd/system/disnix.service <<EOF
[Install]
WantedBy=multi-user.target
[Unit]
After=dbus.service
[Service]
Environment=PATH=/nix/var/nix/profiles/default/bin:/bin
ExecStart=/nix/var/nix/profiles/default/bin/disnix-service                                                   
EOF

# Setup disnix requirements
sudo mkdir -p /var/log/disnix
sudo groupadd disnix || true
sudo usermod -a -G disnix $USER | true

# Start disnix service
sudo systemctl daemon-reload
sudo systemctl reload dbus
sudo systemctl enable disnix
sudo systemctl reenable disnix
sudo systemctl start disnix

# Create keys if not already made
if [ ! -f ~/.ssh/id_rsa ] ; then
    ssh-keygen -N "" -f ~/.ssh/id_rsa
fi