[libvirt] [PATCH] check device-mapper when building without storage mpath

[Wen Congyang]

At 02/18/2011 04:46 PM, Jiri Denemark Write:
> On Fri, Feb 18, 2011 at 16:21:20 +0800, Osier Yang wrote:
>> 于 2011年02月18日 11:00, Wen Congyang 写道:
>>> +DEVMAPPER_CFLAGS=
>>> +DEVMAPPER_LIBS=
>>> +PKG_CHECK_MODULES([DEVMAPPER], [devmapper>= $DEVMAPPER_REQUIRED], [], [DEVMAPPER_FOUND=no])
>>> +if test "$DEVMAPPER_FOUND" = "no"; then
>>> +  # devmapper is missing pkg-config files in ubuntu, suse, etc
>>> +  save_LIBS="$LIBS"
>>> +  save_CFLAGS="$CFLAGS"
>>> +  DEVMAPPER_FOUND=yes
>>> +  AC_CHECK_HEADER([libdevmapper.h],,[DEVMAPPER_FOUND=no])
>>> +  AC_CHECK_LIB([devmapper], [dm_task_run],,[DEVMAPPER_FOUND=no])
>>> +  DEVMAPPER_LIBS="-ldevmapper"
>>> +  LIBS="$save_LIBS"
>>> +  CFLAGS="$save_CFLAGS"
>>> +fi
>>> +if test "$DEVMAPPER_FOUND" = "no" ; then
>>> +  AC_MSG_ERROR([You must install device-mapper-devel/libdevmapper>= $DEVMAPPER_REQUIRED to compile libvirt])
>>>   fi
>>>   AC_SUBST([DEVMAPPER_CFLAGS])
>>>   AC_SUBST([DEVMAPPER_LIBS])
>>
>> Thanks for the fix, actually It can be reproduced simply by:
>> % ./autogen.sh --with-storage-mpath=no
>> % make
>>
>> As src/util/util.c invokes "dm_is_dm_major".
> 
> Yes it does, but I'm not convinced this is the right approach to fix it. Why
> should libvirt always require device-mapper libraries? It only needs it for
> disk and mpath storage drivers so if neither of them is built, we shouldn't
> check for the library and we shouldn't call dm_is_dm_major.

Yes, you are right.
I will update this patch next week.

> 
> NACK to the current patch.
> 
> Jirka
>