[lxc-devel] [PATCH] auto-detect linux kernel release

[Francois-Xavier Bourlet]

Hi,

To be able to have setns (the syscall) support in lxc, you need to
have the linux kernel headers (or source).

Then the lxc build configuration system try to auto-detect the syscall
number using the linux kernel headers/sources. For that you need to
set an environ variable to help the build system to discover the linux
release you want use.

ex:
LINUX_KERNEL_RELEASE = `uname -r`
export LINUX_KERNEL_RELEASE

I mostly build lxc for the kernel I am running on, and so it could be
nice to have the ./configure setting up this variable for us. But let
the choice to customize it if needed.

Here's the patch I am using for it, I don't know as much autotools so
it could make you cry.

---
 config/linux.m4 |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/config/linux.m4 b/config/linux.m4
index 338f393..5c5918c 100644
--- a/config/linux.m4
+++ b/config/linux.m4
@@ -1,5 +1,9 @@
 AC_DEFUN([AC_LINUX],
 [
+	if test -z "$LINUX_KERNEL_RELEASE" ; then
+		LINUX_KERNEL_RELEASE=`uname -r`
+	fi
+	
 	AC_LINUX_DIR()
 	AC_LINUX_SRCARCH()
 ])
-- 
1.7.4.1


Regards,
-- 
François-Xavier Bourlet