[Xen-changelog] [xen stable-4.4] tools/pygrub: Make pygrub understand default entry in string format

[patchbot@xxxxxxx]

commit 3f9d2e1863a2301a219ed9f34f6857df019555ee
Author:     Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Fri Jun 27 10:07:31 2014 -0400
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Fri Feb 27 15:16:04 2015 +0000

    tools/pygrub: Make pygrub understand default entry in string format
    
    Currently pygrub can only correctly parse grub2's default attribute when it 
is
    specified as a number. If it is set to ${saved_entry} or ${next_entry} then
    the first image (i.e. entry number 0) is selected. If any other value is
    specified (typically this would be the string in menuentry) pygrub will 
crash.
    
    This patch will allow pygrub to interpret default attribute if it is 
specified
    as a string (note that in case of submenus only the leaf string will be
    considered).
    
    Also issue a warning if default is set to ${saved_entry} or ${next_entry}.
    
    Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    (cherry picked from commit d1b93ea2615bd789ee28901f1f1c05ffb319cb61)
---
 tools/pygrub/src/GrubConf.py |   10 +++++-----
 tools/pygrub/src/pygrub      |   21 ++++++++++++++++++++-
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/tools/pygrub/src/GrubConf.py b/tools/pygrub/src/GrubConf.py
index 974cded..dea7044 100644
--- a/tools/pygrub/src/GrubConf.py
+++ b/tools/pygrub/src/GrubConf.py
@@ -231,7 +231,7 @@ class _GrubConfigFile(object):
         if val == "saved":
             self._default = 0
         else:
-            self._default = int(val)
+            self._default = val
 
         if self._default < 0:
             raise ValueError, "default must be positive number"
@@ -431,11 +431,11 @@ class Grub2ConfigFile(_GrubConfigFile):
                 
             if self.commands.has_key(com):
                 if self.commands[com] is not None:
-                    if arg.strip() == "${saved_entry}":
+                    arg_strip = arg.strip()
+                    if arg_strip == "${saved_entry}" or arg_strip == 
"${next_entry}":
+                        logging.warning("grub2's saved_entry/next_entry not 
supported")
                         arg = "0"
-                    elif arg.strip() == "${next_entry}":
-                        arg = "0"
-                    setattr(self, self.commands[com], arg.strip())
+                    setattr(self, self.commands[com], arg_strip)
                 else:
                     logging.info("Ignored directive %s" %(com,))
             elif com.startswith('set:'):
diff --git a/tools/pygrub/src/pygrub b/tools/pygrub/src/pygrub
index d0199bc..21265a1 100644
--- a/tools/pygrub/src/pygrub
+++ b/tools/pygrub/src/pygrub
@@ -463,9 +463,28 @@ class Grub:
     def run(self):
         timeout = int(self.cf.timeout)
 
-        self.selected_image = self.cf.default
+        if self.cf.default.isdigit():
+            self.selected_image = int(self.cf.default)
+        else:
+            # We don't fully support submenus. Look for the leaf value in
+            # "submenu0>submenu1>...>menuentry" and hope that it's unique.
+            title = self.cf.default
+            while 1:
+                try:
+                    title = re.search('(\S)>(\S.+$)',title).group(2)
+                except AttributeError:
+                    break
+
+            # Map string to index in images array
+            self.selected_image = 0
+            for i in range(len(self.cf.images)):
+                if self.cf.images[i].title == title:
+                    self.selected_image = i
+                    break
+
         # If the selected (default) image doesn't exist we select the first 
entry
         if self.selected_image > len(self.cf.images):
+            logging.warning("Default image not found")
             self.selected_image = 0
         self.isdone = False
         while not self.isdone:
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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