Write multipathd.conf in anaconda so that dracut can find it.

This writes a multipathd.conf that whitelists the devices we're using in
our multipath devices.  It's a fairly basic configuration, and it doesn't
handle ALUA yet.

1 files changed, 37 insertions, 0 deletions

diff --git a/storage/devicelibs/mpath.py b/storage/devicelibs/mpath.py
new file mode 100644
index 000000000..3de91af62
--- /dev/null
+++ b/storage/devicelibs/mpath.py
@@ -0,0 +1,37 @@
+
+class MultipathConfigWriter:
+    def __init__(self):
+        self.blacklist_exceptions = []
+        self.mpaths = []
+
+    def addMultipathDevice(self, mpath):
+        for parent in mpath.parents:
+            self.blacklist_exceptions.append(parent.name)
+        self.mpaths.append(mpath)
+
+    def write(self):
+        ret = ""
+        ret += """\
+# multipath.conf written by anaconda
+
+blacklist {
+        devnode "*"
+}
+
+blacklist_exceptions {
+"""
+        for device in self.blacklist_exceptions:
+            ret += "\tdevnode \"^%s$\"\n" % (device,)
+        ret += """\
+}
+
+multipaths {
+"""
+        for mpath in self.mpaths:
+            ret += "\tmultipath {\n"
+            for k,v in mpath.config.items():
+                ret += "\t\t%s %s\n" % (k, v)
+            ret += "\t}\n\n"
+        ret += "}\n"
+
+        return ret