nix.install

   1
   2 pre_install () {
   3   # Check that the group and users don't already exist
   4   if [[ -n $(cut -d: -f1 /etc/group | grep -w nixbld) ]]; then
   5     echo "The nixbld group already exists.  This install cannot proceed."
   6     exit 1
   7   fi
   8
   9   for i in {1..10}; do
  10     if [[ -n $(cut -d: -f1 /etc/passwd | grep -w nixbld$i) ]]; then
  11       echo "The nixbld$i user already exists.  This install cannot proceed."
  12       exit 1
  13     fi
  14   done
  15 }
  16
  17 create_users () {
  18   # Create a nixbld group.
  19   groupadd -r nixbld
  20
  21   # Create 10 nixbld{i} users
  22   for i in {1..10}; do
  23     useradd -g nixbld -G nixbld -r -N -M -d /var/empty -s /sbin/nologin nixbld$i
  24   done
  25 }
  26
  27 delete_users() {
  28   # Remove the users
  29   for i in {1..10}; do
  30     userdel nixbld$i
  31   done
  32
  33   # Remove the group
  34   groupdel nixbld
  35 }
  36
  37 create_store() {
  38   # Create nix folders and set permissions
  39   mkdir -p /nix/store
  40   chown root.nixbld /nix/store
  41   chmod 1775 /nix/store
  42   mkdir -p -m 1777 /nix/var/nix/gcroots/per-user
  43   mkdir -p -m 1777 /nix/var/nix/profiles/per-user
  44 }
  45
  46 restore_store() {
  47   # Restore folder permissions
  48   chmod 755 /nix/store
  49   chown root.root /nix/store
  50 }
  51
  52 init_channels() {
  53  # Initialize default nix channel
  54   echo "Initializing default nix channel"
  55   source /etc/profile.d/nix.sh
  56   nix-channel --update
  57 }
  58
  59 daemon_info() {
  60   echo "To start the nix daemon, execute one of the following:"
  61   echo
  62   echo "    systemctl enable nix-daemon.socket       # Sets the daemon to start on next boot"
  63   echo "    systemctl enable --now nix-daemon.socket # Starts now and on next boot too"
  64   echo
  65   echo "Also, if this is a new install, you need to start a new login shell or otherwise"
  66   echo
  67   echo "    source /etc/profile.d/nix.sh"
  68   echo "    source /etc/profile.d/nix-daemon.sh"
  69   echo
  70   echo "Once your environment is set-up, you will need to add some channels.  You can see how"
  71   echo "to do that here:"
  72   echo "    https://nixos.org/nix/manual/#sec-channels"
  73 }
  74
  75 post_install() {
  76   create_users
  77   create_store
  78   init_channels
  79   daemon_info
  80 }
  81
  82 pre_upgrade() {
  83   systemctl stop nix-daemon.socket
  84   systemctl stop nix-daemon
  85 }
  86
  87 post_upgrade() {
  88   delete_users
  89   create_users
  90   create_store
  91   daemon_info
  92 }
  93
  94 pre_remove() {
  95   restore_store
  96   delete_users
  97 }