More work on ssh bootstrap

shell-integration/ssh/bootstrap.sh

@@ -0,0 +1,79 @@
+#!/bin/sh
+# Copyright (C) 2022 Kovid Goyal <kovid at kovidgoyal.net>
+# Distributed under terms of the GPLv3 license.
+
+# read the transmitted data from STDIN
+saved_tty_settings=$(command stty -g)
+command stty -echo
+encoded_data_file=$(mktemp)
+
+cleanup_on_bootstrap_exit() {
+    [[ ! -z "$encoded_data_file" ]] && command rm -f "$encoded_data_file"
+    [[ ! -z "$saved_tty_settings" ]] && command stty "$saved_tty_settings"
+}
+trap 'cleanup_on_bootstrap_exit' EXIT
+
+data_started="n"
+data_complete="n"
+pending_data=""
+if [[ -z "$HOSTNAME" ]]; then
+    hostname=$(hostname)
+    if [[ -z "$hostname" ]]; then hostname="_"; fi
+else
+    hostname=$(HOSTNAME)
+fi
+# ask for the SSH data
+data_password="DATA_PASSWORD"
+password_filename="PASSWORD_FILENAME"
+printf "\eP@kitty-ssh|$password_filename:$data_password:$hostname\e\\"
+
+while IFS= read -r line; do
+    case "$line" in
+        *"KITTY_SSH_DATA_START")
+            prefix=$(command expr "$line" : "\(.*\)KITTY_SSH_DATA_START")
+            pending_data="$pending_data$prefix"
+            data_started="y";
+            ;;
+        "KITTY_SSH_DATA_END")
+            data_complete="y";
+            ;;
+        *)
+            if [[ "$data_started" == "y" ]]; then
+                echo -n "$line" >> "$encoded_data_file"
+            else
+                pending_data="$pending_data$line\n"
+            fi
+            ;;
+    esac
+    if [[ "$data_complete" == "y" ]]; then break; fi
+done
+command stty "$saved_tty_settings"
+saved_tty_settings=""
+if [[ ! -z "$pending_data" ]]; then
+    printf "\eP@kitty-echo|$(echo -n "$pending_data" | base64)\e\\"
+fi
+command base64 -d < "$encoded_data_file" | command tar xjf - --no-same-owner
+rc=$?
+command rm -f "$encoded_data_file"
+encoded_data_file=""
+if [ "$rc" != "0" ]; then echo "Failed to extract data transmitted by ssh kitten over the TTY device" > /dev/stderr; exit 1; fi
+
+# compile terminfo for this system
+if [ -x "$(command -v tic)" ]; then
+    tname=".terminfo"
+    if [ -e "/usr/share/misc/terminfo.cdb" ]; then
+        # NetBSD requires this see https://github.com/kovidgoyal/kitty/issues/4622
+        tname=".terminfo.cdb"
+    fi
+    tic_out=$(command tic -x -o "$HOME/$tname" ".terminfo/kitty.terminfo" 2>&1)
+    rc=$?
+    if [ "$rc" != "0" ]; then echo "$tic_out"; exit 1; fi
+    export TERMINFO="$HOME/$tname"
+fi
+
+# If a command was passed to SSH execute it here
+EXEC_CMD
+
+# ensure $USER is set
+if [ -z "$USER" ]; then export USER=$(whoami); fi
+