kni: avoid using lsb_release script

The lsb_release script is part of an optional package which is not
always installed. On the other hand, /etc/lsb-release is always present
even on minimal Ubuntu installations.

    root@ubuntu1604:~# dpkg -S /etc/lsb-release
    base-files: /etc/lsb-release

Read the file if present and use the variables defined in it.

Signed-off-by: Robin Jarry <robin.jarry@6wind.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/lib/librte_eal/linuxapp/kni/Makefile b/lib/librte_eal/linuxapp/kni/Makefile
index 4e99e07..1e47561 100644 (file)
--- a/lib/librte_eal/linuxapp/kni/Makefile
+++ b/lib/librte_eal/linuxapp/kni/Makefile
@@ -44,8 +44,10 @@ MODULE_CFLAGS += -I$(RTE_OUTPUT)/include -I$(SRCDIR)/ethtool/ixgbe -I$(SRCDIR)/e
 MODULE_CFLAGS += -include $(RTE_OUTPUT)/include/rte_config.h
 MODULE_CFLAGS += -Wall -Werror
 
-ifeq ($(shell lsb_release -si 2>/dev/null),Ubuntu)
-MODULE_CFLAGS += -DUBUNTU_RELEASE_CODE=$(shell lsb_release -sr | tr -d .)
+-include /etc/lsb-release
+
+ifeq ($(DISTRIB_ID),Ubuntu)
+MODULE_CFLAGS += -DUBUNTU_RELEASE_CODE=$(subst .,,$(DISTRIB_RELEASE))
 UBUNTU_KERNEL_CODE := $(shell echo `grep UTS_RELEASE $(RTE_KERNELDIR)/include/generated/utsrelease.h \
         | cut -d '"' -f2 | cut -d- -f1,2 | tr .- ,`,1)
 MODULE_CFLAGS += -D"UBUNTU_KERNEL_CODE=UBUNTU_KERNEL_VERSION($(UBUNTU_KERNEL_CODE))"