mapper: Generate an environment file

Mapper will soon consume four command line arguments that
limit the scope of watched path and interface namespaces.

Add tooling to generate this environment file based on a
new bitbake variables.

Add xyz-openbmc_project and org-openbmc by default in the
Phosphor layer and other layers can add additional namespaces
as needed.

Change-Id: I1c03aa91b75d03652a8a8fb80737553fef224fdf
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/meta-phosphor/classes/phosphor-mapper.bbclass b/meta-phosphor/classes/phosphor-mapper.bbclass
new file mode 100644
index 000000000..26f369b14
--- /dev/null
+++ b/meta-phosphor/classes/phosphor-mapper.bbclass
@@ -0,0 +1,52 @@
+# Common code for recipes that modify the phosphor-mapper
+# configuration.
+#
+# Typically it is not desired to monitor all dbus traffic
+# on a system and as such, the phosphor-mapper has command
+# line options to control what path namespaces and dbus
+# interfaces it will keep track of.
+#
+# The Phosphor layer by default configures the mapper to
+# watch xyz.openbmc_project interfaces and paths only.  This
+# configuration file is intended to be inherited by
+# native recipes in other layers that wish to add namespaces
+# or interfaces to the mapper watchlist.
+
+# Add path namespaces to be monitored:
+# PHOSPHOR_MAPPER_NAMESPACE_append = " /foo/bar"
+
+# Add interfaces to be monitored:
+# PHOSPHOR_MAPPER_INTERFACE_append = " foo.bar"
+
+# Blacklist paths from being monitored:
+# PHOSPHOR_MAPPER_NAMESPACE_BLACKLIST_append = " /foo/bar/baz"
+
+# Blacklist interfaces from being monitored:
+# PHOSPHOR_MAPPER_INTERFACE_BLACKLIST_append = " foo.bar.baz"
+
+inherit phosphor-mapperdir
+
+python phosphor_mapper_do_postinst() {
+    def process_var(d, var, dir):
+        for p in listvar_to_list(d, var):
+            parent = d.getVar('D', True) + d.getVar(dir, True)
+            if not os.path.exists(parent):
+                os.makedirs(parent)
+            path = os.path.join(
+                parent,
+                '-'.join(p[1:].split(os.sep)))
+            with open(path, 'w+') as fd:
+                pass
+
+    process_var(d, 'PHOSPHOR_MAPPER_NAMESPACE', 'namespace_dir')
+    process_var(d, 'PHOSPHOR_MAPPER_INTERFACE', 'interface_dir')
+    process_var(d, 'PHOSPHOR_MAPPER_NAMESPACE_BLACKLIST', 'blacklist_dir')
+    process_var(
+        d, 'PHOSPHOR_MAPPER_INTERFACE_BLACKLIST', 'interfaceblacklist_dir')
+}
+
+do_install[vardeps] += "PHOSPHOR_MAPPER_NAMESPACE"
+do_install[vardeps] += "PHOSPHOR_MAPPER_INTERFACE"
+do_install[vardeps] += "PHOSPHOR_MAPPER_NAMESPACE_BLACKLIST"
+do_install[vardeps] += "PHOSPHOR_MAPPER_INTERFACE_BLACKLIST"
+do_install[postfuncs] += "phosphor_mapper_do_postinst"