[Plugin] add kernel module triggers

Add a new mechanism to trigger plugin execution on the presence
of one or more named Linux kernel module.

Plugins may now declare a "kernel_mods" list (in the same manner
as files, packages etc.) that will cause that plugin to run.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

2 files changed, 18 insertions, 2 deletions

diff --git a/sos/plugins/__init__.py b/sos/plugins/__init__.py
index a018472d..580c0941 100644
--- a/sos/plugins/__init__.py
+++ b/sos/plugins/__init__.py
@@ -128,6 +128,7 @@ class Plugin(object):
     packages = ()
     files = ()
     commands = ()
+    kernel_mods = ()
     archive = None
     profiles = ()
     sysroot = '/'
@@ -934,7 +935,7 @@ class Plugin(object):
         overridden.
         """
         # some files or packages have been specified for this package
-        if any([self.files, self.packages, self.commands]):
+        if any([self.files, self.packages, self.commands, self.kernel_mods]):
             if isinstance(self.files, six.string_types):
                 self.files = [self.files]
 
@@ -944,6 +945,9 @@ class Plugin(object):
             if isinstance(self.commands, six.string_types):
                 self.commands = [self.commands]
 
+            if isinstance(self.kernel_mods, six.string_types):
+                self.kernel_mods = [self.kernel_mods]
+
             if isinstance(self, SCLPlugin):
                 # save SCLs that match files or packages
                 type(self)._scls_matched = []
@@ -968,9 +972,15 @@ class Plugin(object):
         return True
 
     def _files_pkgs_or_cmds_present(self, files, packages, commands):
+            kernel_mods = self.policy.lsmod()
+
+            def have_kmod(kmod):
+                return kmod in kernel_mods
+
             return (any(os.path.exists(fname) for fname in files) or
                     any(self.is_installed(pkg) for pkg in packages) or
-                    any(is_executable(cmd) for cmd in commands))
+                    any(is_executable(cmd) for cmd in commands) or
+                    any(have_kmod(kmod) for kmod in self.kernel_mods))
 
     def default_enabled(self):
         """This decides whether a plugin should be automatically loaded or
diff --git a/sos/policies/__init__.py b/sos/policies/__init__.py
index 5bdc7d85..9e2b719e 100644
--- a/sos/policies/__init__.py
+++ b/sos/policies/__init__.py
@@ -508,6 +508,12 @@ class LinuxPolicy(Policy):
     def sanitize_case_id(self, case_id):
         return re.sub(r"[^-a-z,A-Z.0-9]", "", case_id)
 
+    def lsmod(self):
+        """Return a list of kernel module names as strings.
+        """
+        lines = shell_out("lsmod", timeout=0).splitlines()
+        return [line.split()[0].strip() for line in lines]
+
     def pre_work(self):
         # this method will be called before the gathering begins