[Buildroot] [PATCH] package/openvmtools: enable openvmtools kernel modules

[Romain Naour <romain.naour@openwide.fr>]

Hi Thomas, Karoly, All

Le 20/02/2015 09:22, Thomas Petazzoni a ?crit :
> Dear Romain Naour,
> 
> On Fri, 20 Feb 2015 00:20:46 +0100, Romain Naour wrote:
> 
>> diff --git a/package/openvmtools/0008-configure-don-t-append-build-directory-to-LINUXINCLU.patch b/package/openvmtools/0008-configure-don-t-append-build-directory-to-LINUXINCLU.patch
>> new file mode 100644
>> index 0000000..5d18d9f
>> --- /dev/null
>> +++ b/package/openvmtools/0008-configure-don-t-append-build-directory-to-LINUXINCLU.patch
>> @@ -0,0 +1,31 @@
>> +From 796296f35c6992b4c685b7926a2aff9cd3bcac81 Mon Sep 17 00:00:00 2001
>> +From: Romain Naour <romain.naour@openwide.fr>
>> +Date: Mon, 16 Feb 2015 11:30:23 +0100
>> +Subject: [PATCH 8/8] configure: don't append build directory to LINUXINCLUDE.
>> +
>> +This break the build when LINUXDIR point to the kernel linux sources
>> +(ie not from /lib/module/uname -r/build/include)
>> +
>> +Use directly --with-linuxdir=$(LINUX_DIR)/build if necessary.
>> +
>> +Signed-off-by: Romain Naour <romain.naour@openwide.fr>
>> +---
>> + configure.ac |    2 +-
>> + 1 file changed, 1 insertion(+), 1 deletion(-)
>> +
>> +diff --git a/configure.ac b/configure.ac
>> +index 549736f..6c97785 100644
>> +--- a/configure.ac
>> ++++ b/configure.ac
>> +@@ -148,7 +148,7 @@ if test "$with_kernel_modules" = "yes"; then
>> +          if test ! -d "$LINUXDIR/kernel/"; then
>> +              AC_MSG_ERROR([$LINUXDIR/kernel does not exist])
>> +          fi
>> +-         LINUXINCLUDE="$LINUXDIR/build/include"
>> ++         LINUXINCLUDE="$LINUXDIR/include"
> 
> I believe this patch may not be needed. The idea of the original code
> is that $LINUXDIR should be set to /lib/modules/<kernelversion>/. In a
> normal system, this directory contains a "build" symbolic link, which
> points back to the kernel source directory, or the kernel headers
> directory.
> 
> thomas at skate:/lib/modules/3.16.0-31-generic$ ls -l
> total 4052
> lrwxrwxrwx  1 root root     40 f?vr. 10 17:36 build -> /usr/src/linux-headers-3.16.0-31-generic
> [...]
> 

Thanks for the review,

The --with-linuxdir option is confusing because one can understand (like me)
that we can use directly the kernel source directory.

> 
>> + if test "$os" = "linux"; then
>> +-   MODULES_DIR="$LINUXDIR/kernel/"
>> ++   # MODULES_DIR is used to install vmware modules to the target
>> ++   # Use DESTDIR to define the target rootfs when installing
>> ++   MODULES_DIR="/lib/modules/$KERNEL_RELEASE/kernel/"
> 
> Same here: LINUXDIR is expected to point
> at /lib/modules/<kernelversion>/, and the "kernel" subdirectory in here
> is where kernel modules are installed. So if you point LINUXDIR
> to /lib/modules/<kernelversion>/, this patch should not be needed.
> 
> Now, there is one trick: in the current Buildroot, the kernel modules
> are only installed to $(TARGET_DIR), and when installed, the 'build'
> symbolic link is removed, because it points to a non-nonsensical
> location since the kernel sources (or kernel headers) are not installed
> in $(TARGET_DIR).
> 
> So either we need to keep your patches (but they have no chance of
> being upstreamed), or we install kernel modules to $(STAGING_DIR). I'm
> not sure if we want to do that just for the sake of openvmtools, though.
> 
> So in the end, maybe what you did is the best approach.

The open-vm-tools kernel module build system is not very cross-compilation
friendly and as Karoly said in his reply [1], most of the kernel modules has
been upstreamed.

Not sure upstream will work on this in near future.
But those modules are still needed for "older" kernel.

I need to check when the vmware modules have been merged.

[1] http://lists.busybox.net/pipermail/buildroot/2015-February/119751.html

Best regards,
Romain

> 
>> +config BR2_PACKAGE_OPENVMTOOLS_KERNEL_MODULES
>> +	bool "Openvmtools Linux Kernel Modules"
>> +	depends on BR2_LINUX_KERNEL
>> +	help
>> +	  Build openvmtools's Linux kernel modules.
>> +
>> +comment "Openvmtools's Linux kernel modules needs a Linux kernel to be built"
> 
> needs -> need
> 
> Thomas
>