Don't build kernel modules by default

doc/temci_exec.rst

@@ -782,7 +782,7 @@ Requires root privileges.
 disable_cpu_caches
 ~~~~~~~~~~~~~~~~~~
 Disables the L1 and L2 caches on x86 and x86-64 architectures.
-It uses a small custom kernel module (be sure to compile it via ``temci setup`` after install the appropriate
+It uses a small custom kernel module (be sure to compile it via ``temci setup --build_kernel_modules`` after install the appropriate
 ``kernel-devel`` package, see `Installation <installation.html>`_).
 
 *Attention*: It will slow down your system by orders of magnitude, giving you essentially a Pentium I like processor.
@@ -863,7 +863,7 @@ flush_cpu_caches
 Write back and flush Internal caches; initiate writing-back and flushing of external caches
 (see `WBINVD <https://www.felixcloutier.com/x86/wbinvd>`_).
 
-It uses a small custom kernel module (be sure to compile it via ``temci setup`` after install the appropriate
+It uses a small custom kernel module (be sure to compile it via ``temci setup --build_kernel_modules`` after install the appropriate
 ``kernel-devel`` package, see `Installation <installation.html>`_).
 
 nice

temci/run/run_driver_plugin.py

@@ -378,7 +378,7 @@ def teardown(self):
 class DisableCPUCaches(AbstractRunDriverPlugin):
     """
     Disable the L1 and L2 caches on x86 and x86-64 architectures.
-    Uses a small custom kernel module (be sure to compile it via 'temci setup').
+    Uses a small custom kernel module (be sure to compile it via 'temci setup --build_kernel_modules').
 
     :warning: slows program down significantly and has probably other weird consequences
     :warning: this is untested

temci/scripts/cli.py

@@ -165,7 +165,11 @@ def cli():
                           run_options["common"])
         }
     },
-    "clean": CmdOptionList()
+    "clean": CmdOptionList(),
+    "setup": CmdOptionList(CmdOption("build_kernel_modules", type_scheme=Bool() // Default(False)
+                                     // Description("Build the rusage helper program and the "
+                                                    "kernel modules used for disabling "
+                                                    "the CPU caches (with the --build_kernel_modules option)")))
 }
 misc_commands_description = {
     "completion": {
@@ -961,14 +965,15 @@ def cli_with_error_catching():
 
 
 @cli.command(short_help=command_docs["setup"])
-def setup():
-    temci__setup()
+@cmd_option(misc_commands["setup"])
+def setup(**kwargs):
+    temci__setup(**kwargs)
 
 
-@document_func(command_docs["setup"])
-def temci__setup():
+@document_func(command_docs["setup"], misc_commands["setup"])
+def temci__setup(build_kernel_modules: bool):
     from temci.setup.setup import make_scripts
-    make_scripts()
+    make_scripts(build_kernel_modules)
 
 
 if sphinx_doc():

temci/setup/setup.py

@@ -48,15 +48,19 @@ def exec(dir: str, cmd: str):
         raise ExecError(cmd, str(out), str(err))
 
 
-def make_scripts():
+def make_scripts(build_kernel_modules: bool = False):
     """
     Builds the C and C++ code inside the scripts directory.
+
+    :param build_kernel_modules: build the kernel modules for disabling the CPU caches too
     """
     try:
         exec("rusage", "make")
     except ExecError as err:
         logging.error(err)
         exit(1)
+    if not build_kernel_modules:
+        return
     try:
         exec("cpu_cache/disable", "make")
         exec("cpu_cache/flush", "make")

temci/utils/click_helper.py

@@ -228,7 +228,7 @@ def callback(context: Context, param: click.Option, val):
             self.completion_hints = self.type_scheme.completion_hints
         self.is_flag = is_flag is True or (is_flag is None and type(self.type_scheme) in [Bool, BoolOrNone])  # type: bool
         """ Is this option flag like? """
-        if self.is_flag:
+        if self.is_flag and settings_key is not None:
             self.completion_hints = None
             self.short = None