rework server-side daemon to be reloadable via ssh

admin/daemon.bash

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+source "${BASH_SOURCE%/*}/daemon/common.bash"
+build_log="/tmp/treehouse_build.log"
+
+trap 'kill 0' EXIT
+
+rm -f $reload_fifo
+mkfifo $reload_fifo
+
+reload() {
+    # This just kind of assumes regeneration doesn't take too long.
+    kill "$treehouse_pid"
+    cargo run --release -- serve --port 8082 > "$build_log" &
+    treehouse_pid="$!"
+}
+
+reload
+
+while true; do
+    read command < "$reload_fifo"
+    case "$command" in
+        reload)
+            echo "Reloading"
+            reload;;
+    esac
+done