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diff --git a/bbot/worker/worker.cli b/bbot/worker/worker.cli
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+// file      : bbot/worker.cli
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : TBC; see accompanying LICENSE file
+
+include <bbot/common.cli>;
+
+"\section=1"
+"\name=bbot-worker"
+"\summary=build bot worker"
+
+namespace bbot
+{
+  {
+    "<options> <module> <conf-var>",
+
+    "
+    \h|SYNOPSIS|
+
+    \cb{bbot-worker --help}\n
+    \cb{bbot-worker --version}\n
+    \c{\b{bbot-worker --bootstrap} [<options>]}\n
+    \c{\b{bbot-worker --startup} [<options>]}\n
+    \c{\b{bbot-worker} [<options>] <module>... <conf-var>...}
+
+    \h|DESCRIPTION|
+
+    \cb{bbot-worker} @@ TODO.
+
+    If the \cb{--bootstrap} mode option is specified, then the worker performs
+    the initial machine bootstrap and writes the bootstrap result manifest to
+    \c{stdout}. If the \cb{--startup} mode option is specified, then the
+    worker performs the environment setup and then re-executes in the build
+    mode. If neither of the mode options is specified, then the worker
+    proceeds to performing the build task.
+    "
+  }
+
+  class worker_options
+  {
+    "\h|OPTIONS|"
+
+    //
+    // NOTE: when adding new options, consider whether they should be
+    //       propagated from startup to build.
+    //
+
+    bool --help {"Print usage information and exit."}
+    bool --version {"Print version and exit."}
+
+    bool --bootstrap
+    {
+      "Perform the inital machine bootstrap insteading of building."
+    }
+
+    bool --startup
+    {
+      "Perform the environment setup and then re-execute for building."
+    }
+
+    bool --systemd-daemon
+    {
+      "Run as a simple systemd daemon."
+    }
+
+    dir_path --build
+    {
+      "<dir>",
+      "The directory to perform the build in. If not specified, then the
+       current working directory is used."
+    }
+
+    dir_path --environments
+    {
+      "<dir>",
+      "The directory containing the environment setup executables. If not
+       specified, then the user's home directory is used."
+    }
+
+    uint16_t --verbose = 1
+    {
+      "<level>",
+      "Set the diagnostics verbosity to <level> between 0 and 6 with level 1
+       being the default."
+    }
+
+    // Testing options.
+    //
+    string --tftp-host = "196.254.111.222"
+    {
+      "<addr>",
+      "The TFTP host address and, optionally, port to use to download the
+       build task and to upload the build result. By default the link-local
+       address 196.254.111.222 with the standard TFTP port (69) is used."
+    }
+  };
+
+  "
+  \h|EXIT STATUS|
+
+  Non-zero exit status is returned in case of an error.
+  "
+}