File Switch-target-driver-DB-root-dir-to-etc-target.patch of Package python-rtslib-fb.9370

From f823033e5c6beced0590a00064e1e7a55e76a995 Mon Sep 17 00:00:00 2001
From: Lee Duncan <lduncan@suse.com>
Date: Tue, 13 Jun 2017 09:45:30 -0700
Subject: [PATCH] Switch target driver DB root dir to /etc/target

This switches the kernel target driver directory from
the default of /var/target to /etc/target, if the
"dbroot" sysfs attribute is present. If not, the default
of /var/target is maintained. This has to be done
by rtslib/root.py since this module loads the
target_core_mod module, where the dbroot value
must be updated before any target_core_* drivers
register with target_core_mod.
---
 rtslib/root.py | 24 ++++++++++++++++++++++++
 rtslib/tcm.py  |  3 ++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/rtslib/root.py b/rtslib/root.py
index 99a25b778cd1..ee7b1039bd06 100644
--- a/rtslib/root.py
+++ b/rtslib/root.py
@@ -28,6 +28,7 @@ from .fabric import FabricModule
 from .tcm import so_mapping, bs_cache, StorageObject
 from .utils import RTSLibError, RTSLibALUANotSupported, modprobe, mount_configfs
 from .utils import dict_remove, set_attributes
+from .utils import fread, fwrite
 from .alua import ALUATargetPortGroup
 
 default_save_file = "/etc/target/saveconfig.json"
@@ -57,6 +58,12 @@ class RTSRoot(CFSNode):
     '''
 
     # RTSRoot private stuff
+
+    # this should match the kernel target driver default db dir
+    _default_dbroot = "/var/target"
+    # this is where the target DB is to be located (instead of the default)
+    _preferred_dbroot = "/etc/target"
+
     def __init__(self):
         '''
         Instantiate an RTSRoot object. Basically checks for configfs setup and
@@ -75,6 +82,8 @@ class RTSRoot(CFSNode):
             modprobe('target_core_mod')
             self._create_in_cfs_ine('any')
 
+        self._set_dbroot_if_needed()
+
     def _list_targets(self):
         self._check_self()
         for fabric_module in self.fabric_modules:
@@ -148,6 +157,19 @@ class RTSRoot(CFSNode):
     def __str__(self):
         return "rtslib"
 
+    def _set_dbroot_if_needed(self):
+        dbroot_path = self.path + "/dbroot"
+        if not os.path.exists(dbroot_path):
+            self._dbroot = self._default_dbroot
+            return
+        self._dbroot = fread(dbroot_path)
+        if self._dbroot != self._preferred_dbroot:
+            fwrite(dbroot_path, self._preferred_dbroot+"\n")
+            self._dbroot = fread(dbroot_path)
+
+    def _get_dbroot(self):
+        return self._dbroot
+
     # RTSRoot public stuff
 
     def dump(self):
@@ -320,6 +342,8 @@ class RTSRoot(CFSNode):
             doc="Get the list of all FabricModule objects.")
     alua_tpgs = property(_list_alua_tpgs,
             doc="Get the list of all ALUA TPG objects.")
+    dbroot = property(_get_dbroot,
+            doc="Get the target database root")
 
 def _test():
     '''Run the doctests.'''
diff --git a/rtslib/tcm.py b/rtslib/tcm.py
index 82ef34e0634e..73bfbe3b8359 100644
--- a/rtslib/tcm.py
+++ b/rtslib/tcm.py
@@ -78,7 +78,8 @@ class StorageObject(CFSNode):
         need to read it in and squirt it back into configfs when we configure
         the storage object. BLEH.
         """
-        aptpl_dir = "/var/target/pr"
+        from .root import RTSRoot
+        aptpl_dir = "%s/pr" % RTSRoot().dbroot
 
         try:
             lines = fread("%s/aptpl_%s" % (aptpl_dir, self.wwn)).split()
-- 
2.12.3