new example for rsync/usb backup server

devices/gl-mt300n-v2/default.nix

@@ -173,6 +173,8 @@
           GPIOLIB="y";
           GPIO_MT7621 = "y";
 
+          PHY_RALINK_USB = "y";
+
           CMDLINE_PARTITION = "y";
           EARLY_PRINTK = "y";
 

examples/arhcive.nix

@@ -0,0 +1,179 @@
+# This is not part of Liminix per se. This is a "scratchpad"
+# configuration for a device I'm testing with.
+#
+# Parts of it do do things that Liminix eventually needs to do, but
+# don't look in here for solutions - just for identifying the
+# problems.
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  secrets = import ./extneder-secrets.nix;
+  inherit
+    (pkgs.liminix.networking)
+    address
+    udhcpc
+    interface
+    route
+  ;
+  inherit (pkgs.liminix.services) oneshot longrun bundle target;
+  inherit (pkgs.pseudofile) dir symlink;
+  inherit (pkgs) writeText dropbear ifwait serviceFns
+    ;
+in rec {
+  boot = {
+    tftp = {
+      enable = true;
+      serverip = "192.168.8.148";
+      ipaddr = "192.168.8.251";
+    };
+  };
+
+  imports = [
+    ../modules/tftpboot.nix
+    ../modules/wlan.nix
+    # ./modules/flashable.nix
+  ];
+
+  hostname = "arhcive";
+
+  kernel = {
+    config = {
+      USB = "y";
+      USB_EHCI_HCD = "y";
+      USB_EHCI_HCD_PLATFORM = "y";
+      USB_OHCI_HCD = "y";
+      USB_OHCI_HCD_PLATFORM = "y";
+      USB_SUPPORT = "y";
+      USB_COMMON = "y";
+      USB_STORAGE = "y";
+      USB_STORAGE_DEBUG = "n";
+      USB_UAS = "y";
+      USB_ANNOUNCE_NEW_DEVICES = "y";
+      SCSI = "y";
+      BLK_DEV_SD = "y";
+      USB_PRINTER = "y";
+      PARTITION_ADVANCED = "y";
+      MSDOS_PARTITION = "y";
+      EFI_PARTITION = "y";
+      EXT4_FS = "y";
+      EXT4_USE_FOR_EXT2 = "y";
+      FS_ENCRYPTION = "y";
+    };
+  };
+
+  services.dhcpc = (udhcpc config.hardware.networkInterfaces.lan {
+    dependencies = [ config.services.hostname ];
+  }) // { inherit (config.hardware.networkInterfaces.lan) device; };
+
+  services.sshd = longrun {
+    name = "sshd";
+    run = ''
+      mkdir -p /run/dropbear
+      ${dropbear}/bin/dropbear -E -P /run/dropbear.pid -R -F
+    '';
+  };
+
+  services.resolvconf = oneshot rec {
+    dependencies = [ services.dhcpc ];
+    name = "resolvconf";
+    up = ''
+      . ${serviceFns}
+      ( in_outputs ${name}
+      for i in $(output ${services.dhcpc} dns); do
+        echo "nameserver $i" > resolv.conf
+      done
+      )
+    '';
+    down = ''
+      rm -rf /run/service-state/${name}/
+    '';
+  };
+  filesystem = dir {
+    etc = dir {
+      "resolv.conf" = symlink "${services.resolvconf}/.outputs/resolv.conf";
+    };
+    srv = dir {};
+  };
+
+  services.defaultroute4 = route {
+    name = "defaultroute";
+    via = "$(output ${services.dhcpc} router)";
+    target = "default";
+    dependencies = [services.dhcpc];
+  };
+
+  programs.busybox  = {
+    applets = ["blkid" "lsusb" "tar"];
+    options = {
+      FEATURE_LS_TIMESTAMPS = "y";
+      FEATURE_LS_SORTFILES = "y";
+      FEATURE_BLKID_TYPE = "y";
+      FEATURE_MOUNT_FLAGS = "y";
+      FEATURE_MOUNT_LABEL = "y";
+      FEATURE_VOLUMEID_EXT = "y";
+    };
+  };
+
+  services.mount_external_disk = oneshot {
+    name = "mount_external_disk";
+    up = "mount -t ext4 LABEL=backup-disk /srv";
+    down = "umount /srv";
+  };
+
+  services.rsync =
+    let
+      secrets_file = oneshot rec {
+        name = "rsync-secrets";
+        up = ''
+          . ${serviceFns}
+          (in_outputs ${name}
+           echo  "backup:${secrets.rsync_secret}" > secrets)
+        '';
+        down = "true";
+      };
+      configFile = writeText "rsync.conf" ''
+        pid file = /run/rsyncd.pid
+        uid = store
+        [srv]
+          path = /srv
+          use chroot = yes
+          auth users = backup
+          read only = false
+          secrets file = ${secrets_file}/.outputs/secrets
+      '';
+    in longrun {
+      name = "rsync";
+      run = ''
+        ${pkgs.rsync}/bin/rsync --no-detach --daemon  --config=${configFile}
+      '';
+      dependencies = [
+        secrets_file
+        services.mount_external_disk
+        config.hardware.networkInterfaces.lan
+      ] ;
+    };
+
+    services.default = target {
+    name = "default";
+    contents =
+      let links = config.hardware.networkInterfaces;
+      in with config.services; [
+        links.lo links.eth links.wlan
+        defaultroute4
+        resolvconf
+        sshd
+        rsync
+      ];
+  };
+  users.root.passwd = lib.mkForce secrets.root_password;
+
+  users.store = {
+    uid=500; gid=500; gecos="Storage owner"; dir="/srv";
+    shell="/dev/null"; # authorizedKeys = [];
+  };
+
+  defaultProfile.packages = with pkgs; [e2fsprogs strace tcpdump ];
+}