Improve TRAMP performance with SSH ControlMaster and persistent sockets

ansible/inventory/group_vars/desktop.yml

@@ -234,6 +234,10 @@ desktop_common_dotfiles:
     src: .local/bin/udiskie-password
     dest: .local/bin/udiskie-password
     mode: "0755"
+  - name: SSH config
+    src: .ssh/config
+    dest: .ssh/config
+    mode: "0600"
 
 desktop_i3_dotfiles:
   - name: i3 config

ansible/roles/dotfiles_common/tasks/main.yml

@@ -16,6 +16,15 @@
   loop: "{{ xdg_user_directories | default([]) }}"
   when: "'void' in group_names"
 
+- name: Ensure SSH socket directory exists
+  tags: [dotfiles, dotfiles:common]
+  ansible.builtin.file:
+    path: "{{ effective_user_home }}/.local/state/ssh/sockets"
+    state: directory
+    owner: "{{ effective_username }}"
+    group: "{{ effective_user_group }}"
+    mode: "0700"
+
 - name: Copy common dotfiles
   tags: [dotfiles, dotfiles:common]
   ansible.builtin.copy:

dotfiles/desktop/.emacs.d/init.el

@@ -19,6 +19,7 @@
   'tools/dired
   'tools/project
   'tools/spell
+  'tools/tramp
   'tools/lsp
   'tools/dap
   'tools/treesitter

dotfiles/desktop/.emacs.d/lisp/tools/tramp.el

@@ -0,0 +1,13 @@
+;;; tramp.el -*- lexical-binding: t; -*-
+
+(use-package tramp
+  :config
+  (setq tramp-use-ssh-controlmaster-options t)
+  (setq tramp-chunksize 500)
+  (setq tramp-verbose 0)
+  (setq tramp-gvfs-wget "wget --quiet")
+  (setq tramp-cache-read-persistent-cache t))
+
+(provide 'tools/tramp)
+
+;;; tramp.el ends here

dotfiles/desktop/.ssh/config

@@ -0,0 +1,7 @@
+Host *
+    ControlMaster auto
+    ControlPath ~/.local/state/ssh/sockets/%r@%h-%p
+    ControlPersist 600
+    Compression yes
+    ServerAliveInterval 60
+    ServerAliveCountMax 3