[Xen-devel] [PATCH] tools/pygrub: Make pygrub understand default entry in string format

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

Currently pygrub can only correctly parse grub2's default attribute when
it is specified as a number. If is 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>
---
 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..1d8644d 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 a4a2423..955a1b0 100644
--- a/tools/pygrub/src/pygrub
+++ b/tools/pygrub/src/pygrub
@@ -450,9 +450,28 @@ 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):
+            log.warning("Default image not found")
             self.selected_image = 0
         self.isdone = False
         while not self.isdone:
-- 
1.7.10.4


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