added remote shell detection

functions.sh

@@ -114,3 +114,10 @@ function rv() {
 	printf ' RV=%d \e[0m\n' $RV >&2
 }
 
+function hexy() {
+	python3 -c 'import sys
+for v in sys.argv[1:]:
+  print("{:02x}".format(int(v)), end="")
+print("")
+' $*
+}

is_remote.sh

@@ -0,0 +1,21 @@
+# Detect if the current session is running on a remote server by listing parent
+# processes of this shell and checking for things like sshd/tailscaled. Runs
+# first because multiple other things rely on this.
+
+
+function __is_remote() {
+	# names of daemon processes a remote shell might be a child process of
+	remote_daemons=(
+	    sshd
+	)
+
+	is_remote=()
+	parent_procs="$(pstree -s $$)"
+	for d in ${remote_daemons[@]}; do
+		if [[ "$parent_procs" =~ "$d" ]]; then
+			return 1
+		fi
+	done
+
+	return 0
+}