fix travis

Now we need linux-headers to build as vsock requires
<linux/vm_sockets.h>. But ubuntu saves it to
/usr/src/linux-headers-$(uname -r)/include/uapi
in its linux-headers package. Need to move it to /usr/include/linux
manually because one cannot include the uapi directory directly.

Signed-off-by: Peng Tao <bergwolf@gmail.com>

Author: bergwolf

.travis.yml

@@ -9,7 +9,9 @@ matrix:
 
 before_install:
   - sudo apt-get update -qq
-  - sudo apt-get install -y autoconf automake pkg-config libdevmapper-dev libsqlite3-dev libvirt-dev qemu libvirt-bin -qq
+  - sudo apt-get install -y -qq autoconf automake pkg-config libdevmapper-dev libsqlite3-dev libvirt-dev qemu libvirt-bin linux-headers-$(uname -r)
+  - sudo mkdir -p /usr/include/linux
+  - sudo cp /usr/src/linux-headers-$(uname -r)/include/uapi/linux/vm_sockets.h /usr/include/linux
   - cd `mktemp -d`
   - wget https://git.fedorahosted.org/cgit/lvm2.git/snapshot/lvm2-2_02_131.tar.xz
   - tar xf lvm2-2_02_131.tar.xz

configure.ac

@@ -73,6 +73,9 @@ AS_IF([test "x$enable_daemon" = "xno"],[SYSTEMD_SYSTEMUNIT=no])
 AC_SUBST(SYSTEMD_SYSTEMUNIT)
 AM_CONDITIONAL(SYSTEMD, test "x${SYSTEMD_SYSTEMUNIT}" != "xno" )
 
+AC_CHECK_FILE([/usr/include/linux/vm_sockets.h],
+	      [], [AC_MSG_ERROR(Cannot find linux/vm_sockets.h)])
+
 AC_CONFIG_FILES([
   Makefile
   src/Makefile