On Thu, Jul 14, 2011 at 11:51:25AM -0400, Michael MacLeod wrote:
> I recently updated the kernel on an Ubuntu 11.04 PVM domU. The dom0 is an
> up to date Debian Squeeze host (Xen 4.0.1). Attempting to start the domU
> after this with xm create gives "Error: Boot loader didn't return any
> data!". I ran pygrub against the domU manually, I got the following:
> Traceback (most recent call last):
> File "/usr/lib/xen-default/bin/pygrub", line 669, in <module>
> chosencfg = run_grub(file, entry, fs, incfg["args"])
> File "/usr/lib/xen-default/bin/pygrub", line 549, in run_grub
> g = Grub(file, fs)
> File "/usr/lib/xen-default/bin/pygrub", line 205, in __init__
> self.read_config(file, fs)
> File "/usr/lib/xen-default/bin/pygrub", line 413, in read_config
> self.cf.parse(buf)
> File "/usr/lib/xen-4.0/bin/../lib/python/grub/GrubConf.py", line 400, in
> parse
> raise RuntimeError, "syntax error: closing brace without menuentry"
> RuntimeError: syntax error: closing brace without menuentry
> Looking at GrubConf.py, around line 400 we have this bit of logic:
> title_match = re.match('^menuentry ["\'](.*)["\'] (.*){', l)
> if title_match:
> if img is not None:
> raise RuntimeError, "syntax error: cannot nest
> menuentry (%d %s)" % (len(img),img)
> img = []
> title = title_match.group(1)
> continue
> if l.startswith("}"):
> if img is None:
> raise RuntimeError, "syntax error: closing brace
> without menuentry"
> Looking at the grub.cfg, I see the following section:
> menuentry 'Ubuntu, with Linux 2.6.38-10-generic' --class ubuntu --class
> gnu-linux --class gnu --class os {
> <snip>
> }
> menuentry 'Ubuntu, with Linux 2.6.38-10-generic (recovery mode)' --class
> ubuntu --class gnu-linux --class gnu --class os {
> <snip>
> }
> submenu "Previous Linux versions" {
> menuentry 'Ubuntu, with Linux 2.6.38-8-generic' --class ubuntu --class
> gnu-linux --class gnu --class os {
> <snip>
> }
> menuentry 'Ubuntu, with Linux 2.6.38-8-generic (recovery mode)' --class
> ubuntu --class gnu-linux --class gnu --class os {
> <snip>
> }
> }
> Note that this grub.cfg contains a submenu entry. I'm not particular
> familiar with python, but it appears that GrubConf.py checks all lines
> with a closing bracket for a matching menuentry line, and this submenu
> causes that check to fail. There's also the error about nesting
> menuentries, but I see not logic for matching against a submenu. The
> workaround is to remove the submenu and it's closing bracket from the
> grub.cfg, but the fix would be to add support for submenus to pygrub.
Feel free to contribute such a patch :)
-- Pasi
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