forgot to commit openos

data/openos/bin/hostname.lua

@@ -0,0 +1,30 @@
+local shell = require("shell")
+local args, ops = shell.parse(...)
+local hostname = args[1]
+
+if hostname then
+  local file, reason = io.open("/etc/hostname", "w")
+  if not file then
+    io.stderr:write("failed to open for writing: ", reason, "\n")
+    return 1
+  end
+  file:write(hostname)
+  file:close()
+  ops.update = true
+else
+  local file = io.open("/etc/hostname")
+  if file then
+    hostname = file:read("*l")
+    file:close()
+  end
+end
+
+if ops.update then
+  os.setenv("HOSTNAME_SEPARATOR", hostname and #hostname > 0 and ":" or "")
+  os.setenv("HOSTNAME", hostname)
+elseif hostname then
+  print(hostname)
+else
+  io.stderr:write("Hostname not set\n")
+  return 1
+end