Configure keybinding and command to renew environment (SSH_AUTH_SOCK, DISPLAY) inside tmux session when attached back to existing session

tmux/renew_env.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -eu
+
+pane_fmt="#{pane_id} #{pane_in_mode} #{pane_input_off} #{pane_dead} #{pane_current_command}"
+tmux list-panes -s -F "$pane_fmt" | awk '
+  $2 == 0 && $3 == 0 && $4 == 0 && $5 ~ /(bash|zsh|ksh|fish)/ { print $1 }
+' | while read -r pane_id; do
+  # renew environment variables according to update-environment tmux option
+  # also clear screen
+  tmux send-keys -t "$pane_id" 'Enter' 'eval "$(tmux show-env -s)"' 'Enter' 'C-l'
+done;

tmux/tmux.conf

@@ -309,13 +309,20 @@ set -g @prefix_highlight_show_copy_mode 'on'
 set -g @prefix_highlight_copy_mode_attr "fg=$color_dark,bg=$color_secondary"
 
 
+# =====================================
+# ===        Renew environment      ===
+# =====================================
+set -g update-environment \
+  "DISPLAY\
+  SSH_ASKPASS\
+  SSH_AUTH_SOCK\
+  SSH_AGENT_PID\
+  SSH_CONNECTION\
+  SSH_TTY\
+  WINDOWID\
+  XAUTHORITY"
 
-# ============================
-# ===         Hooks        ===
-# ============================
-
-# Prompt to rename window right after it's created
-set-hook -g after-new-window 'command-prompt -I "#{window_name}" "rename-window '%%'"'
+bind '$' run "~/.tmux/renew_env.sh"
 
 
 # ============================