Modules/Impermanence: Convert newhome/newroot to shell scripts

home/modules/fish/default.nix

@@ -133,33 +133,6 @@ in {
             ns = "nix shell nixpkgs#";
           }
 
-          # Impermanence
-          # TODO: Those should be a single script to be called with the search path (/ or /home/christoph or just .)
-          (let
-            fdIgnoreHome = "fdignore-home";
-            fdIgnoreRoot = "fdignore-root";
-
-            cmdHome = "sudo fd --one-file-system --base-directory /home/${username} --type f --hidden --ignore-file /home/${username}/.config/impermanence/${fdIgnoreHome}";
-            cmdRoot = "sudo fd --one-file-system --base-directory / --type f --hidden --ignore-file /home/${username}/.config/impermanence/${fdIgnoreRoot}";
-
-            fzfHome = "sudo fzf --preview 'bat --color=always --theme=ansi --style=numbers --line-range=:100 {}'";
-            fzfRoot = "sudo fzf --preview 'bat --color=always --theme=ansi --style=numbers --line-range=:100 /{}'";
-
-            mvHome = "mkdir -p /persist/home/${username}/$(dirname {}) && mv {} /persist/home/${username}/$(dirname {})";
-            mvRoot = "sudo mkdir -p /persist/$(dirname {}) && sudo mv {} /persist/$(dirname {})";
-
-            header = "--header 'Press CTRL-R to reload, CTRL-M to move, CTRL-F to ignore file'";
-
-            ignoreFileHome = "echo '{}' >> /home/${username}/.config/impermanence/${fdIgnoreHome}";
-            ignoreFileRoot = "echo '{}' >> /home/${username}/.config/impermanence/${fdIgnoreRoot}";
-
-            bindHome = "--bind 'ctrl-r:reload(${cmdHome}),ctrl-m:execute(${mvHome}),ctrl-f:execute(${ignoreFileHome})'";
-            bindRoot = "--bind 'ctrl-r:reload(${cmdRoot}),ctrl-m:execute(${mvRoot}),ctrl-f:execute(${ignoreFileRoot})'";
-          in {
-            newhome = ''${cmdHome} | ${fzfHome} ${header} ${bindHome}'';
-            newroot = ''${cmdRoot} | ${fzfRoot} ${header} ${bindRoot}'';
-          })
-
           # Abbrs only available if package is installed
 
           (abbrify pkgs.duf {
@@ -211,6 +184,8 @@ in {
             # grep = rg;
           })
 
+          (lib.optionalAttrs config.modules.rmpc.enable {r = "rcmp";})
+
           (abbrify pkgs.rsync rec {
             rsync = "rsync -ahv --inplace --partial --info=progress2";
             copy = rsync;

system/modules/impermanence/default.nix

@@ -38,15 +38,17 @@ in {
       #   group = config.users.users.${user}.group;
       # };
     };
+
+    mkRDir = mkDir "root";
+    mkRFile = mkFile "root";
+    mkUDir = mkDir "${username}";
+    mkUFile = mkFile "${username}";
   in
     lib.mkIf impermanence.enable {
-      environment.persistence."/persist" = let
+      # TODO: Create options to allow host-specific impermanence setup
-        mkRDir = mkDir "root";
+      #       inside the respective modules
-        mkRFile = mkFile "root";
+      environment.persistence."/persist" = {
-        mkUDir = mkDir "${username}";
+        hideMounts = false; # Sets x-gvfs-hide option
-        mkUFile = mkFile "${username}";
-      in {
-        hideMounts = true; # Sets x-gvfs-hide option
 
         files = [
           (mkRFile "/etc/adjtime" m644)
@@ -155,14 +157,57 @@ in {
         };
       };
 
-      # NOTE: This is REQUIRED for HM activation! Otherwise the home directory won't be writable!
+      # Add some helper scripts to identify files that might need persisting
+      environment.systemPackages = let
+        base = {
+          "root" = "/";
+          "home" = "/home/${username}";
+        };
+        ignore = {
+          "root" = "/home/${username}/.config/impermanence/fdignore-root";
+          "home" = "/home/${username}/.config/impermanence/fdignore-home";
+        };
+        move = {
+          "root" = "/persist/$(dirname {})";
+          "home" = "/persist/home/${username}/$(dirname {})";
+        };
+
+        mkHeader = "Press CTRL-R to reload, CTRL-M to move, CTRL-I to ignore file";
+        mkPreview = mode: "bat --color=always --theme=ansi --style=numbers --line-range=:100 ${base.${mode}}/{}";
+        mkReload = mode: "sudo fd --one-file-system --type f --hidden --base-directory ${base.${mode}} --ignore-file ${ignore.${mode}}";
+        mkIgnore = mode: "echo '{}' >> ${ignore.${mode}}";
+        mkMove = mode: "sudo mkdir -p ${move.${mode}} && sudo mv {} ${move.${mode}}";
+
+        mkScript = mode: ''
+          sudo ${mkReload mode} | \
+          sudo fzf \
+            --header "${mkHeader}" \
+            --preview "${mkPreview mode}" \
+            --bind "ctrl-r:reload:(${mkReload mode})" \
+            --bind "ctrl-i:execute:(${mkIgnore mode})" \
+            --bind "ctrl-m:execute:(${mkMove mode})"
+        '';
+
+        newroot = pkgs.writeShellScriptBin "newroot" (mkScript "root");
+        newhome = pkgs.writeShellScriptBin "newhome" (mkScript "home");
+      in [
+        newroot
+        newhome
+      ];
+
+      # NOTE: This is REQUIRED for HM activation!
+      #       Otherwise the home directory won't be writable!
       systemd.services."impermanence-fix-home-ownership" = let
         homeDir = "/home/${username}";
-        homeUser = builtins.toString config.users.users.${username}.uid;
+        homeUser =
-        homeGroup = builtins.toString config.users.groups.${config.users.users.${username}.group}.gid;
+          builtins.toString
+          config.users.users.${username}.uid;
+        homeGroup =
+          builtins.toString
+          config.users.groups.${config.users.users.${username}.group}.gid;
       in {
         description = "Fix impermanent home ownership";
-        wantedBy = ["home-manager-${username}.service"]; # Required for HM activation
+        wantedBy = ["home-manager-${username}.service"];
         before = ["home-manager-${username}.service"];
         after = ["home.mount"];
         partOf = ["home.mount"];
@@ -201,21 +246,18 @@ in {
           backupDuration = "7"; # Days
           mountDir = "/btrfs_tmp";
           persistDir = "${mountDir}/persist";
-
-          homeUser = builtins.toString config.users.users.${username}.uid;
-          homeGroup = builtins.toString config.users.groups.${config.users.users.${username}.group}.gid;
         in {
           description = "Clean impermanent btrfs subvolumes";
           wantedBy = ["initrd.target"];
-          # after = ["dev-mapper-crypted.device"];
           after = ["systemd-cryptsetup@crypted.service"];
           before = ["sysroot.mount"];
           unitConfig.DefaultDependencies = "no";
           serviceConfig.Type = "oneshot";
-          # path = ["/bin" config.system.build.extraUtils pkgs.coreutils-full];
 
-          # NOTE: If any single line of this script fails, the entire system might be bricked
+          # NOTE: If any single line of this script fails
-          #       NixOS automatically sets "-e", so if unlucky, the subvolumes won'e exist for mounting
+          #       the entire system might be bricked.
+          #       NixOS automatically sets "-e", so if unlucky,
+          #       the subvolumes won'e exist for mounting...
           script = let
             mvSubvolToPersist = subvol: ''
               if [[ -e ${mountDir}/${subvol} ]]; then
@@ -239,6 +281,7 @@ in {
               fi
             '';
 
+            # TODO: This fails and bricks the system
             deleteOldBackups = subvol: ''
               for old_${subvol} in $(find ${persistDir}/old_${subvol}s/ -maxdepth 1 -mtime +${backupDuration}); do
                 delete_subvolume_recursively "$old_${subvol}"