Good day.
We've done following change in our XCP installation, I think it can be
useful for others (and may be to upstream).
It change order of "extra_args" appending - instead joining to
'internal' VM kernel args this patch add them to the front.
Rationale: if user make some (unbootable) error inside VM (f.e. make a
mistake in 'root' option) it can change it via PV-args of virtual
machine (instead xe-edit-bootloader). This allows us to provide
'failsafe' services to customer without administrator interaction. Linux
do have very simple behavior: if option repeated, first value used.
--- /usr/bin/pygrub.old 2012-02-20 17:55:22.000000000 +0400
+++ /usr/bin/pygrub 2012-02-20 17:56:01.000000000 +0400
@@ -753,7 +753,7 @@
if chosencfg["args"] == None:
chosencfg["args"] = extra_args
else:
- chosencfg["args"] += " " + extra_args
+ chosencfg["args"] = extra_args + " " + chosencfg["args"]
if not_really:
bootcfg["kernel"] = "<kernel:%s>" % chosencfg["kernel"]
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