Update bootstrap so that it works again

bootstrap

@@ -3,30 +3,44 @@
 
 export IN_NIX_SHELL=
 
-set -e
+set -ex
 
 mkdir -p /mnt/home/balsoft/projects
 nixos-generate-config --root /mnt
-echo 'import /home/balsoft/projects/nixos-config "$(hostname)"' > /mnt/etc/nixos/configuration.nix
+echo import /home/balsoft/projects/nixos-config \"$(hostname)\" > /mnt/etc/nixos/configuration.nix
 cd /mnt/home/balsoft/projects
-git clone ssh://git@github.com/balsoft/nixos-config
+[ -d nixos-config ] || git clone ssh://git@github.com/balsoft/nixos-config
 cd nixos-config
 
 touch secret.nix
-while [[ -s secret.nix ]]
+while [[ ! -s secret.nix ]]
 do gpg -dq secret.nix.gpg > secret.nix
 done
 
-mv /mnt/etc/nixos/hardware-configuration.nix hardware-configuration/$(hostname).nix
+[ -s hardware-configuration/$(hostname).nix ] || mv /mnt/etc/nixos/hardware-configuration.nix hardware-configuration/$(hostname).nix
 
-mkdir /home/balsoft
+mkdir -p /home/balsoft
 mount --rbind /mnt/home/balsoft /home/balsoft
 mount --rbind /mnt/etc/nixos /etc/nixos
-umount -l /nix/.rw-store
-cp /nix/ /mnt -r
+
+export NIX_PATH=
+
+nixpkgs=$(nix eval --raw '(import ./nix/sources.nix).nixpkgs')
+nix-store --repair-path $nixpkgs # Evaluating doesn't actually add it to store
+rm /tmp/nixpkgs -rf
+cp -r $nixpkgs /tmp/nixpkgs # Because we lose everything we added to store after we unmount it
+
+export NIX_PATH=nixpkgs=/tmp/nixpkgs:nixos-config=/etc/nixos/configuration.nix
+
+nix copy --all --to /mnt --no-require-sigs
+
+echo The following operation is irreversible. RET to continue.
+read
+
+umount -l /nix/.rw-store || echo "RW-store is not mounted."
 mount --rbind /mnt/nix /nix
 
-./build --substituters "https://cache.balsoft.ru https://cache.nixos.org" --no-require-sigs
+nix-build /tmp/nixpkgs/nixos -A system --substituters "https://cache.balsoft.ru https://cache.nixos.org" --no-require-sigs
 nixos-install --system ./result
 cd /mnt/home/balsoft
 chmod 777 -R .