[autotest] Drop RPC support for specifying a test kernel.

Our legacy Autotest code included support for specifying a specific
kernel to be tested when creating a job.  That support wasn't
appropriate for Chrome OS, and didn't work.

All existing user level interfaces for specifying a kernel (CLI and
AFE) have been changed to drop this feature.  This change removes
support for the feature in the RPC calls.  Lower-level layers still
contain support that is unused, which will be removed in subsequent
CLs.

BUG=chromium:266704
TEST=Look at control file from AFE job creation page; run atest job create

Change-Id: Ifb0c6888f550f6cda98195b489ba8076cdf47e6b
Reviewed-on: https://chromium-review.googlesource.com/346570
Commit-Ready: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
diff --git a/frontend/afe/control_file.py b/frontend/afe/control_file.py
index a88a8b4..8971a88 100644
--- a/frontend/afe/control_file.py
+++ b/frontend/afe/control_file.py
@@ -16,152 +16,11 @@
 
 EMPTY_TEMPLATE = 'def step_init():\n'
 
-CLIENT_KERNEL_TEMPLATE = """\
-kernel_list = %(client_kernel_list)s
-
-def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-
-
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), '%(kernel_args)s'))
-    testkernel.boot(args=cmdline)
-
-
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
-"""
-
-SERVER_KERNEL_TEMPLATE = """\
-kernel_list = %%(server_kernel_list)s
-kernel_install_control = \"""
-%s    pass
-\"""
-
-from autotest_lib.client.common_lib import error
-
-at = autotest.Autotest()
-
-%%(upload_config_func)s
-def install_kernel(machine, kernel_info):
-    host = hosts.create_host(machine)
-    at.install(host=host)
-    %%(call_upload_config)s
-    at.run(kernel_install_control %%%%
-           {'client_kernel_list': repr([kernel_info])}, host=host)
-
-
-num_machines_required = len(machines)
-if len(machines) > 4:
-    # Allow a large multi-host tests to proceed despite a couple of hosts
-    # failing to properly install the desired kernel (exclude those hosts).
-    # TODO(gps): Figure out how to get and use SYNC_COUNT here.  It is defined
-    # within some control files and will end up inside of stepN functions below.
-    num_machines_required = len(machines) - 2
-
-
-def step_init():
-    # a host object we use solely for the purpose of finding out the booted
-    # kernel version, we use machines[0] since we already check that the same
-    # kernel has been booted on all machines
-    if len(kernel_list) > 1:
-        kernel_host = hosts.create_host(machines[0])
-
-    for kernel_info in kernel_list:
-        func = lambda machine: install_kernel(machine, kernel_info)
-        good_machines = job.parallel_on_machines(func, machines)
-        if len(good_machines) < num_machines_required:
-            raise error.TestError(
-                    "kernel installed on only %%%%d of %%%%d machines."
-                    %%%% (len(good_machines), num_machines_required))
-
-        # Replace the machines list that step_test() will use with the
-        # ones that successfully installed the kernel.
-        machines[:] = good_machines
-
-        # have server_job.run_test() automatically add the kernel version as
-        # a suffix to the test name otherwise we cannot run the same test on
-        # different kernel versions
-        if len(kernel_list) > 1:
-            job.automatic_test_tag = kernel_host.get_kernel_ver()
-        step_test()
-
-
-def step_test():
-""" % CLIENT_KERNEL_TEMPLATE
-
 CLIENT_STEP_TEMPLATE = "    job.next_step('step%d')\n"
 SERVER_STEP_TEMPLATE = '    step%d()\n'
 
-UPLOAD_CONFIG_FUNC = """
-def upload_kernel_config(host, kernel_info):
-    \"""
-    If the kernel_info['config_file'] is a URL it will be downloaded
-    locally and then uploaded to the client and a copy of the original
-    dictionary with the new path to the config file will be returned.
-    If the config file is not a URL the function returns the original
-    dictionary.
-    \"""
-    import os
-    from autotest_lib.client.common_lib import autotemp, utils
 
-    config_orig = kernel_info.get('config_file')
-
-    # if the file is not an URL then we assume it's a local client path
-    if not config_orig or not utils.is_url(config_orig):
-        return kernel_info
-
-    # download it locally (on the server) and send it to the client
-    config_tmp = autotemp.tempfile('kernel_config_upload', dir=job.tmpdir)
-    try:
-        utils.urlretrieve(config_orig, config_tmp.name)
-        config_new = os.path.join(host.get_autodir(), 'tmp',
-                                  os.path.basename(config_orig))
-        host.send_file(config_tmp.name, config_new)
-    finally:
-        config_tmp.clean()
-
-    return dict(kernel_info, config_file=config_new)
-
-"""
-
-CALL_UPLOAD_CONFIG = 'kernel_info = upload_kernel_config(host, kernel_info)'
-
-
-def kernel_config_file(kernel, platform):
-    """Gets the kernel config.
-
-    @param kernel The kernel rpm .
-    @param platform The platform object.
-
-    @return The kernel config string or None.
-    """
-    if (not kernel.endswith('.rpm') and platform and
-        platform.kernel_config):
-        return platform.kernel_config
-    return None
-
-
-def read_control_file(test):
+def _read_control_file(test):
     """Reads the test control file from local disk.
 
     @param test The test name.
@@ -174,43 +33,7 @@
     return control_contents
 
 
-def get_kernel_stanza(kernel_list, platform=None, kernel_args='',
-                      is_server=False, upload_kernel_config=False):
-
-    template_args = {'kernel_args' : kernel_args}
-
-    # add 'config_file' keys to the kernel_info dictionaries
-    new_kernel_list = []
-    for kernel_info in kernel_list:
-        if kernel_info.get('config_file'):
-            # already got a config file from the user
-            new_kernel_info = kernel_info
-        else:
-            config_file = kernel_config_file(kernel_info['version'], platform)
-            new_kernel_info = dict(kernel_info, config_file=config_file)
-
-        new_kernel_list.append(new_kernel_info)
-
-    if is_server:
-        template = SERVER_KERNEL_TEMPLATE
-        # leave client_kernel_list as a placeholder
-        template_args['client_kernel_list'] = '%(client_kernel_list)s'
-        template_args['server_kernel_list'] = repr(new_kernel_list)
-
-        if upload_kernel_config:
-            template_args['call_upload_config'] = CALL_UPLOAD_CONFIG
-            template_args['upload_config_func'] = UPLOAD_CONFIG_FUNC
-        else:
-            template_args['call_upload_config'] = ''
-            template_args['upload_config_func'] = ''
-    else:
-        template = CLIENT_KERNEL_TEMPLATE
-        template_args['client_kernel_list'] = repr(new_kernel_list)
-
-    return template % template_args
-
-
-def add_boilerplate_to_nested_steps(lines):
+def _add_boilerplate_to_nested_steps(lines):
     """Adds boilerplate magic.
 
     @param lines The string of lines.
@@ -227,19 +50,19 @@
     return lines
 
 
-def format_step(item, lines):
+def _format_step(item, lines):
     """Format a line item.
     @param item The item number.
     @param lines The string of lines.
 
     @returns The string lines.
     """
-    lines = indent_text(lines, '    ')
+    lines = _indent_text(lines, '    ')
     lines = 'def step%d():\n%s' % (item, lines)
     return lines
 
 
-def get_tests_stanza(tests, is_server, prepend=None, append=None,
+def _get_tests_stanza(tests, is_server, prepend=None, append=None,
                      client_control_file='', test_source_build=None):
     """ Constructs the control file test step code from a list of tests.
 
@@ -265,36 +88,14 @@
         raw_control_files = site_rpc_interface.get_test_control_files_by_build(
                 tests, test_source_build)
     else:
-        raw_control_files = [read_control_file(test) for test in tests]
-    return _get_tests_stanza(raw_control_files, is_server, prepend, append,
-                             client_control_file=client_control_file)
-
-
-def _get_tests_stanza(raw_control_files, is_server, prepend, append,
-                      client_control_file=''):
-    """
-    Implements the common parts of get_test_stanza.
-
-    A site_control_file that wants to implement its own get_tests_stanza
-    likely wants to call this in the end.
-
-    @param raw_control_files A list of raw control file data to be combined
-        into a single control file.
-    @param is_server bool, Is this a server side test?
-    @param prepend A list of steps to prepend to each client test.
-    @param append A list of steps to append to each client test.
-    @param client_control_file If specified, use this text as the body of a
-        final client control file to append to raw_control_files after fixups.
-
-    @returns The combined mega control file.
-    """
+        raw_control_files = [_read_control_file(test) for test in tests]
     if client_control_file:
-        # 'return locals()' is always appended incase the user forgot, it
+        # 'return locals()' is always appended in case the user forgot, it
         # is necessary to allow for nested step engine execution to work.
         raw_control_files.append(client_control_file + '\nreturn locals()')
-    raw_steps = prepend + [add_boilerplate_to_nested_steps(step)
+    raw_steps = prepend + [_add_boilerplate_to_nested_steps(step)
                            for step in raw_control_files] + append
-    steps = [format_step(index, step)
+    steps = [_format_step(index, step)
              for index, step in enumerate(raw_steps)]
     if is_server:
         step_template = SERVER_STEP_TEMPLATE
@@ -307,7 +108,7 @@
     return header + '\n' + '\n\n'.join(steps) + footer
 
 
-def indent_text(text, indent):
+def _indent_text(text, indent):
     """Indent given lines of python code avoiding indenting multiline
     quoted content (only for triple " and ' quoting for now).
 
@@ -354,8 +155,7 @@
     return prepend, append
 
 
-def _sanity_check_generate_control(is_server, client_control_file, kernels,
-                                   upload_kernel_config):
+def _sanity_check_generate_control(is_server, client_control_file):
     """
     Sanity check some of the parameters to generate_control().
 
@@ -369,68 +169,30 @@
                 {'tests' : 'You cannot run server tests at the same time '
                  'as directly supplying a client-side control file.'})
 
-    if kernels:
-        # make sure that kernel is a list of dictionarions with at least
-        # the 'version' key in them
-        kernel_error = model_logic.ValidationError(
-                {'kernel': 'The kernel parameter must be a sequence of '
-                 'dictionaries containing at least the "version" key '
-                 '(got: %r)' % kernels})
-        try:
-            iter(kernels)
-        except TypeError:
-            raise kernel_error
-        for kernel_info in kernels:
-            if (not isinstance(kernel_info, dict) or
-                    'version' not in kernel_info):
-                raise kernel_error
 
-        if upload_kernel_config and not is_server:
-            raise model_logic.ValidationError(
-                    {'upload_kernel_config': 'Cannot use upload_kernel_config '
-                                             'with client side tests'})
-
-
-def generate_control(tests, kernels=None, platform=None, is_server=False,
-                     profilers=(), client_control_file='', profile_only=None,
-                     upload_kernel_config=False, test_source_build=None):
+def generate_control(tests, is_server=False, profilers=(),
+                     client_control_file='', profile_only=None,
+                     test_source_build=None):
     """
     Generate a control file for a sequence of tests.
 
     @param tests A sequence of test control files to run.
-    @param kernels A sequence of kernel info dictionaries configuring which
-            kernels to boot for this job and other options for them
-    @param platform A platform object with a kernel_config attribute.
     @param is_server bool, Is this a server control file rather than a client?
     @param profilers A list of profiler objects to enable during the tests.
     @param client_control_file Contents of a client control file to run as the
             last test after everything in tests.  Requires is_server=False.
     @param profile_only bool, should this control file run all tests in
             profile_only mode by default
-    @param upload_kernel_config: if enabled it will generate server control
-            file code that uploads the kernel config file to the client and
-            tells the client of the new (local) path when compiling the kernel;
-            the tests must be server side tests
     @param test_source_build: Build to be used to retrieve test code. Default
                               to None.
 
     @returns The control file text as a string.
     """
-    _sanity_check_generate_control(is_server=is_server, kernels=kernels,
-                                   client_control_file=client_control_file,
-                                   upload_kernel_config=upload_kernel_config)
-
-    control_file_text = ''
-    if kernels:
-        control_file_text = get_kernel_stanza(
-                kernels, platform, is_server=is_server,
-                upload_kernel_config=upload_kernel_config)
-    else:
-        control_file_text = EMPTY_TEMPLATE
-
+    _sanity_check_generate_control(is_server=is_server,
+                                   client_control_file=client_control_file)
+    control_file_text = EMPTY_TEMPLATE
     prepend, append = _get_profiler_commands(profilers, is_server, profile_only)
-
-    control_file_text += get_tests_stanza(tests, is_server, prepend, append,
-                                          client_control_file,
-                                          test_source_build)
+    control_file_text += _get_tests_stanza(tests, is_server, prepend, append,
+                                           client_control_file,
+                                           test_source_build)
     return control_file_text
diff --git a/frontend/afe/doctests/001_rpc_test.txt b/frontend/afe/doctests/001_rpc_test.txt
index caf4bd4..f21bf99 100644
--- a/frontend/afe/doctests/001_rpc_test.txt
+++ b/frontend/afe/doctests/001_rpc_test.txt
@@ -428,40 +428,15 @@
 
 # generate a control file
 >>> cf_info = rpc_interface.generate_control_file(
-...     tests=['sleeptest', 'my_test'],
-...     kernel=[{'version': '2.6.18'}, {'version': '2.6.18-blah.rpm'},
-...             {'version': '2.6.26', 'cmdline': 'foo bar'}],
-...     label='my_label')
+...     tests=['sleeptest', 'my_test'])
 >>> print cf_info['control_file'] #doctest: +NORMALIZE_WHITESPACE
-kernel_list = [{'version': '2.6.18', 'config_file': u'my_kernel_config'}, {'version': '2.6.18-blah.rpm', 'config_file': None}, {'cmdline': 'foo bar', 'version': '2.6.26', 'config_file': u'my_kernel_config'}]
 def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), ''))
-    testkernel.boot(args=cmdline)
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
     job.next_step('step0')
     job.next_step('step1')
+<BLANKLINE>
 def step0():
     job.run_test('testname')
+<BLANKLINE>
 def step1():
     job.run_test('testname')
 >>> cf_info['is_server'], cf_info['synch_count'], cf_info['dependencies']
@@ -469,34 +444,9 @@
 
 # generate a control file from existing body text.
 >>> cf_info_pi = rpc_interface.generate_control_file(
-...     kernel=[{'version': '3.1.41'}], label='my_label',
 ...     client_control_file='print "Hi"\n')
 >>> print cf_info_pi['control_file'] #doctest: +NORMALIZE_WHITESPACE
-kernel_list = [{'version': '3.1.41', 'config_file': u'my_kernel_config'}]
 def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), ''))
-    testkernel.boot(args=cmdline)
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
     job.next_step('step0')
 def step0():
     print "Hi"
@@ -792,8 +742,7 @@
 ## hosts or meta_hosts.
 
 >>> sleep_cf_info = rpc_interface.generate_control_file(
-...         tests=['sleeptest'],  kernel=[{'version': '2.6.18'}],
-...         label='two-label')
+...         tests=['sleeptest'])
 >>> job_id = rpc_interface.create_job(
 ...         name='atomic_sleeptest', priority=30,
 ...         control_file=sleep_cf_info['control_file'],
diff --git a/frontend/afe/doctests/003_misc_rpc_features.txt b/frontend/afe/doctests/003_misc_rpc_features.txt
index 53938d1..559e196 100644
--- a/frontend/afe/doctests/003_misc_rpc_features.txt
+++ b/frontend/afe/doctests/003_misc_rpc_features.txt
@@ -84,226 +84,21 @@
 def step3():
     job.profilers.delete('iostat')
 
-# test preserving of the kernel config file setting
->>> cf_info = rpc_interface.generate_control_file(
-...     tests=['sleeptest'],
-...     kernel=[{'version': '2.6.18', 'config_file': 'foo/bar'}])
->>> print cf_info['control_file'] #doctest: +NORMALIZE_WHITESPACE
-kernel_list = [{'version': '2.6.18', 'config_file': 'foo/bar'}]
-def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), ''))
-    testkernel.boot(args=cmdline)
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
-    job.next_step('step0')
-def step0():
-    job.run_test('testname')
-
-# upload_kernel_config requires server side test
->>> rpc_interface.generate_control_file(tests=['sleeptest'],
-...        kernel=[{'version': '2.6.18', 'config_file': 'foo/bar'}],
-...        upload_kernel_config=True)
-Traceback (most recent call last):
-ValidationError: {'upload_kernel_config': 'Cannot use upload_kernel_config with client side tests'}
-
 # server-side control file generation
 >>> rpc_interface.modify_test('sleeptest', test_type='Server')
->>> cf_info = rpc_interface.generate_control_file(tests=['sleeptest'],
-...        kernel=[{'version': '2.6.18'}, {'version': '2.6.22'}])
+>>> cf_info = rpc_interface.generate_control_file(tests=['sleeptest'])
 >>> print cf_info['control_file'] #doctest: +NORMALIZE_WHITESPACE
-kernel_list = [{'version': '2.6.18', 'config_file': None}, {'version': '2.6.22', 'config_file': None}]
-kernel_install_control = """
-kernel_list = %(client_kernel_list)s
 def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), ''))
-    testkernel.boot(args=cmdline)
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
-    pass
-"""
-from autotest_lib.client.common_lib import error
-at = autotest.Autotest()
-def install_kernel(machine, kernel_info):
-    host = hosts.create_host(machine)
-    at.install(host=host)
-    at.run(kernel_install_control %
-           {'client_kernel_list': repr([kernel_info])}, host=host)
-num_machines_required = len(machines)
-if len(machines) > 4:
-    # Allow a large multi-host tests to proceed despite a couple of hosts
-    # failing to properly install the desired kernel (exclude those hosts).
-    # TODO(gps): Figure out how to get and use SYNC_COUNT here.  It is defined
-    # within some control files and will end up inside of stepN functions below.
-    num_machines_required = len(machines) - 2
-def step_init():
-    # a host object we use solely for the purpose of finding out the booted
-    # kernel version, we use machines[0] since we already check that the same
-    # kernel has been booted on all machines
-    if len(kernel_list) > 1:
-        kernel_host = hosts.create_host(machines[0])
-    for kernel_info in kernel_list:
-        func = lambda machine: install_kernel(machine, kernel_info)
-        good_machines = job.parallel_on_machines(func, machines)
-        if len(good_machines) < num_machines_required:
-            raise error.TestError(
-                    "kernel installed on only %d of %d machines."
-                    % (len(good_machines), num_machines_required))
-        # Replace the machines list that step_test() will use with the
-        # ones that successfully installed the kernel.
-        machines[:] = good_machines
-        # have server_job.run_test() automatically add the kernel version as
-        # a suffix to the test name otherwise we cannot run the same test on
-        # different kernel versions
-        if len(kernel_list) > 1:
-            job.automatic_test_tag = kernel_host.get_kernel_ver()
-        step_test()
-def step_test():
     step0()
+<BLANKLINE>
 def step0():
     job.run_test('testname')
+<BLANKLINE>
 step_init()
+<BLANKLINE>
 >>> cf_info['is_server']
 True
 
-# server-side control file generation with kernel config upload code
->>> cf_info = rpc_interface.generate_control_file(tests=['sleeptest'],
-...        kernel=[{'version': '2.6.18', 'config_file': 'foo/bar'}],
-...        upload_kernel_config=True)
->>> print cf_info['control_file'] #doctest: +NORMALIZE_WHITESPACE
-kernel_list = [{'version': '2.6.18', 'config_file': 'foo/bar'}]
-kernel_install_control = """
-kernel_list = %(client_kernel_list)s
-def step_init():
-    for kernel_info in kernel_list:
-        job.next_step(boot_kernel, kernel_info)
-        job.next_step(step_test, kernel_info['version'])
-    if len(kernel_list) > 1:
-        job.use_sequence_number = True  # include run numbers in directory names
-def boot_kernel(kernel_info):
-    # remove kernels (and associated data) not referenced by the bootloader
-    for host in job.hosts:
-        host.cleanup_kernels()
-    testkernel = job.kernel(kernel_info['version'])
-    if kernel_info['config_file']:
-        testkernel.config(kernel_info['config_file'])
-    testkernel.build()
-    testkernel.install()
-    cmdline = ' '.join((kernel_info.get('cmdline', ''), ''))
-    testkernel.boot(args=cmdline)
-def step_test(kernel_version):
-    global kernel
-    kernel = kernel_version  # Set the global in case anyone is using it.
-    if len(kernel_list) > 1:
-        # this is local to a machine, safe to assume there's only one host
-        host, = job.hosts
-        job.automatic_test_tag = host.get_kernel_ver()
-    pass
-"""
-from autotest_lib.client.common_lib import error
-at = autotest.Autotest()
-def upload_kernel_config(host, kernel_info):
-    """
-    If the kernel_info['config_file'] is a URL it will be downloaded
-    locally and then uploaded to the client and a copy of the original
-    dictionary with the new path to the config file will be returned.
-    If the config file is not a URL the function returns the original
-    dictionary.
-    """
-    import os
-    from autotest_lib.client.common_lib import autotemp, utils
-    config_orig = kernel_info.get('config_file')
-    # if the file is not an URL then we assume it's a local client path
-    if not config_orig or not utils.is_url(config_orig):
-        return kernel_info
-    # download it locally (on the server) and send it to the client
-    config_tmp = autotemp.tempfile('kernel_config_upload', dir=job.tmpdir)
-    try:
-        utils.urlretrieve(config_orig, config_tmp.name)
-        config_new = os.path.join(host.get_autodir(), 'tmp',
-                                  os.path.basename(config_orig))
-        host.send_file(config_tmp.name, config_new)
-    finally:
-        config_tmp.clean()
-    return dict(kernel_info, config_file=config_new)
-def install_kernel(machine, kernel_info):
-    host = hosts.create_host(machine)
-    at.install(host=host)
-    kernel_info = upload_kernel_config(host, kernel_info)
-    at.run(kernel_install_control %
-           {'client_kernel_list': repr([kernel_info])}, host=host)
-num_machines_required = len(machines)
-if len(machines) > 4:
-    # Allow a large multi-host tests to proceed despite a couple of hosts
-    # failing to properly install the desired kernel (exclude those hosts).
-    # TODO(gps): Figure out how to get and use SYNC_COUNT here.  It is defined
-    # within some control files and will end up inside of stepN functions below.
-    num_machines_required = len(machines) - 2
-def step_init():
-    # a host object we use solely for the purpose of finding out the booted
-    # kernel version, we use machines[0] since we already check that the same
-    # kernel has been booted on all machines
-    if len(kernel_list) > 1:
-        kernel_host = hosts.create_host(machines[0])
-    for kernel_info in kernel_list:
-        func = lambda machine: install_kernel(machine, kernel_info)
-        good_machines = job.parallel_on_machines(func, machines)
-        if len(good_machines) < num_machines_required:
-            raise error.TestError(
-                    "kernel installed on only %d of %d machines."
-                    % (len(good_machines), num_machines_required))
-        # Replace the machines list that step_test() will use with the
-        # ones that successfully installed the kernel.
-        machines[:] = good_machines
-        # have server_job.run_test() automatically add the kernel version as
-        # a suffix to the test name otherwise we cannot run the same test on
-        # different kernel versions
-        if len(kernel_list) > 1:
-            job.automatic_test_tag = kernel_host.get_kernel_ver()
-        step_test()
-def step_test():
-    step0()
-def step0():
-    job.run_test('testname')
-step_init()
-
 # test that multiline quoted strings are not indented
 >>> import common
 >>> from autotest_lib.frontend.afe import test, control_file
diff --git a/frontend/afe/rpc_interface.py b/frontend/afe/rpc_interface.py
index 116a327..d5de365 100644
--- a/frontend/afe/rpc_interface.py
+++ b/frontend/afe/rpc_interface.py
@@ -748,17 +748,14 @@
 
 # jobs
 
-def generate_control_file(tests=(), kernel=None, label=None, profilers=(),
+def generate_control_file(tests=(), profilers=(),
                           client_control_file='', use_container=False,
-                          profile_only=None, upload_kernel_config=False,
-                          db_tests=True, test_source_build=None):
+                          profile_only=None, db_tests=True,
+                          test_source_build=None):
     """
-    Generates a client-side control file to load a kernel and run tests.
+    Generates a client-side control file to run tests.
 
     @param tests List of tests to run. See db_tests for more information.
-    @param kernel A list of kernel info dictionaries configuring which kernels
-        to boot for this job and other options for them
-    @param label Name of label to grab kernel config from.
     @param profilers List of profilers to activate during the job.
     @param client_control_file The contents of a client-side control file to
         run at the end of all tests.  If this is supplied, all tests must be
@@ -772,10 +769,6 @@
     @param profile_only A boolean that indicates what default profile_only
         mode to use in the control file. Passing None will generate a
         control file that does not explcitly set the default mode at all.
-    @param upload_kernel_config: if enabled it will generate server control
-            file code that uploads the kernel config file to the client and
-            tells the client of the new (local) path when compiling the kernel;
-            the tests must be server side tests
     @param db_tests: if True, the test object can be found in the database
                      backing the test model. In this case, tests is a tuple
                      of test IDs which are used to retrieve the test objects
@@ -795,14 +788,13 @@
         return dict(control_file='', is_server=False, synch_count=1,
                     dependencies=[])
 
-    cf_info, test_objects, profiler_objects, label = (
-        rpc_utils.prepare_generate_control_file(tests, kernel, label,
-                                                profilers, db_tests))
+    cf_info, test_objects, profiler_objects = (
+        rpc_utils.prepare_generate_control_file(tests, profilers,
+                                                db_tests))
     cf_info['control_file'] = control_file.generate_control(
-        tests=test_objects, kernels=kernel, platform=label,
-        profilers=profiler_objects, is_server=cf_info['is_server'],
+        tests=test_objects, profilers=profiler_objects,
+        is_server=cf_info['is_server'],
         client_control_file=client_control_file, profile_only=profile_only,
-        upload_kernel_config=upload_kernel_config,
         test_source_build=test_source_build)
     return cf_info
 
diff --git a/frontend/afe/rpc_utils.py b/frontend/afe/rpc_utils.py
index eea15b9..4b3e383 100644
--- a/frontend/afe/rpc_utils.py
+++ b/frontend/afe/rpc_utils.py
@@ -285,8 +285,7 @@
     return False
 
 
-def prepare_generate_control_file(tests, kernel, label, profilers,
-                                  db_tests=True):
+def prepare_generate_control_file(tests, profilers, db_tests=True):
     if db_tests:
         test_objects = [models.Test.smart_get(test) for test in tests]
     else:
@@ -309,8 +308,6 @@
         synch_count = max(test.sync_count for test in test_objects)
     else:
         synch_count = 1
-    if label:
-        label = models.Label.smart_get(label)
 
     if db_tests:
         dependencies = set(label.name for label
@@ -321,7 +318,7 @@
 
     cf_info = dict(is_server=is_server, synch_count=synch_count,
                    dependencies=list(dependencies))
-    return cf_info, test_objects, profiler_objects, label
+    return cf_info, test_objects, profiler_objects
 
 
 def check_job_dependencies(host_objects, job_dependencies):