l green-host: use cryfs & nixos-containers

1 files changed, 63 insertions, 46 deletions

diff --git a/lass/2configs/green-host.nix b/lass/2configs/green-host.nix
index 0cccbc30..6cccab4b 100644
--- a/lass/2configs/green-host.nix
+++ b/lass/2configs/green-host.nix
@@ -1,38 +1,44 @@
 { config, lib, pkgs, ... }:
 with import <stockholm/lib>;
 
-{
+let
+
+  cname = "green";
+  cryfs = pkgs.cryfs.overrideAttrs (old: {
+    patches = [
+      (pkgs.writeText "file_mode.patch" ''
+        --- a/src/cryfs/filesystem/CryNode.cpp
+        +++ b/src/cryfs/filesystem/CryNode.cpp
+        @@ -171,7 +171,7 @@ CryNode::stat_info CryNode::stat() const {
+             result.uid = fspp::uid_t(getuid());
+             result.gid = fspp::gid_t(getgid());
+         #endif
+        -    result.mode = fspp::mode_t().addDirFlag().addUserReadFlag().addUserWriteFlag().addUserExecFlag();
+        +    result.mode = fspp::mode_t().addDirFlag().addUserReadFlag().addUserWriteFlag().addUserExecFlag().addGroupReadFlag().addGroupExecFlag().addOtherReadFlag().addOtherExecFlag();;
+             result.size = fsblobstore::DirBlob::DIR_LSTAT_SIZE;
+             //TODO If possible without performance loss, then for a directory, st_nlink should return number of dir entries (including "." and "..")
+             result.nlink = 1;
+      '')
+    ] ++ old.patches;
+  });
+
+in {
   imports = [
     <stockholm/lass/2configs/container-networking.nix>
     <stockholm/lass/2configs/syncthing.nix>
-    { #hack for already defined
-      systemd.services."container@green".reloadIfChanged = mkForce false;
-      systemd.services."container@green".preStart = ''
-        ${pkgs.mount}/bin/mount | ${pkgs.gnugrep}/bin/grep -q ' on /var/lib/containers/green '
-      '';
-      systemd.services."container@green".postStop = ''
-        set -x
-        ${pkgs.umount}/bin/umount /var/lib/containers/green
-        ls -la /dev/mapper/control
-        ${pkgs.devicemapper}/bin/dmsetup ls
-        ${pkgs.cryptsetup}/bin/cryptsetup -v luksClose /var/lib/sync-containers/green.img
-      '';
-    }
   ];
 
-  services.syncthing.declarative.folders."/var/lib/sync-containers".devices = [ "icarus" "skynet" "littleT" "shodan" ];
-  krebs.permown."/var/lib/sync-containers" = {
-    owner = "root";
-    group = "syncthing";
-    umask = "0007";
-  };
+  programs.fuse.userAllowOther = true;
 
-  system.activationScripts.containerPermissions = ''
-    mkdir -p /var/lib/containers
-    chmod 711 /var/lib/containers
-  '';
+  services.syncthing.declarative.folders."/var/lib/sync-containers/${cname}".devices = [ "icarus" "skynet" "littleT" "shodan" ];
+  # krebs.permown."/var/lib/sync-containers/${cname}" = {
+  #   owner = "root";
+  #   group = "syncthing";
+  #   umask = "0007";
+  # };
 
-  containers.green = {
+  systemd.services."container@green".reloadIfChanged = mkForce false;
+  containers.${cname} = {
     config = { ... }: {
       environment.systemPackages = [
         pkgs.git
@@ -42,41 +48,52 @@ with import <stockholm/lib>;
       users.users.root.openssh.authorizedKeys.keys = [
         config.krebs.users.lass.pubkey
       ];
+      system.activationScripts.fuse = {
+        text = ''
+          ${pkgs.coreutils}/bin/mknod /dev/fuse c 10 229
+        '';
+        deps = [];
+      };
     };
+    allowedDevices = [
+      { modifier = "rwm"; node = "/dev/fuse"; }
+    ];
     autoStart = false;
     enableTun = true;
     privateNetwork = true;
-    hostAddress = "10.233.2.15";
-    localAddress = "10.233.2.16";
+    hostAddress = "10.233.2.15"; # TODO find way to automatically calculate IPs
+    localAddress = "10.233.2.16"; # TODO find way to automatically calculate IPs
   };
 
   environment.systemPackages = [
-    (pkgs.writeDashBin "start-green" ''
-      set -fu
-      CONTAINER='green'
-      IMAGE='/var/lib/sync-containers/green.img'
-
-      ${pkgs.cryptsetup}/bin/cryptsetup status "$CONTAINER" >/dev/null
-      if [ "$?" -ne 0 ]; then
-        ${pkgs.cryptsetup}/bin/cryptsetup luksOpen "$IMAGE" "$CONTAINER"
-      fi
-
-      mkdir -p /var/lib/containers/"$CONTAINER"
+    (pkgs.writeDashBin "start-${cname}" ''
+      set -euf
 
-      ${pkgs.mount}/bin/mount | grep -q " on /var/lib/containers/"$CONTAINER" "
-      if [ "$?" -ne 0 ]; then
-        ${pkgs.mount}/bin/mount -o sync /dev/mapper/"$CONTAINER" /var/lib/containers/"$CONTAINER"
+      mkdir -p /var/lib/containers/${cname}/var/state
+      chown ${config.services.syncthing.user}: /var/lib/containers/${cname}/var/state
+      if ! ${pkgs.mount}/bin/mount | grep -q '^cryfs@/var/lib/sync-containers/${cname} on /var/lib/containers/${cname}/var/state '; then
+        /run/wrappers/bin/sudo -u "${config.services.syncthing.user}" \
+          ${cryfs}/bin/cryfs /var/lib/sync-containers/${cname} /var/lib/containers/${cname}/var/state -o allow_other -o default_permissions
       fi
 
-      STATE=$(${pkgs.nixos-container}/bin/nixos-container status "$CONTAINER")
+      STATE=$(${pkgs.nixos-container}/bin/nixos-container status ${cname})
       if [ "$STATE" = 'down' ]; then
-        ${pkgs.nixos-container}/bin/nixos-container start "$CONTAINER"
+        ${pkgs.nixos-container}/bin/nixos-container start ${cname}
       fi
-      ping -c1 green.r
-      if [ "$?" -ne 0 ]; then
-        ${pkgs.nixos-container}/bin/nixos-container run green -- nixos-rebuild -I /var/src switch
+
+      if ! ping -c1 -q -w5 ${cname}.r && [ -d /var/lib/containers/${cname}/var/src ]; then
+        ${pkgs.nixos-container}/bin/nixos-container run ${cname} -- ${pkgs.writeDash "deploy-${cname}" ''
+          mkdir -p /var/state/var_src
+          ln -sf state/var_Src /var/src
+          nixos-rebuild -I /var/src switch
+        ''}
       fi
+    '')
+    (pkgs.writeDashBin "stop-${cname}" ''
+      set -euf
 
+      ${pkgs.nixos-container}/bin/nixos-container stop ${cname}
+      ${cryfs}/bin/cryfs-unmount /var/lib/containers/${cname}/var/state
     '')
   ];
 }