[LTP] [PATCH 1/2] lib/tst_kvercmp: Add support to get distname for Ubuntu in tst_kvcmp_distname

[Po-Hsu Lin]

The kver on Ubuntu will be something like these:
* 4.4.0-187-generic
* 5.4.0-1021-kvm
* 4.15.0-1093-azure

So it's better to grep for ^ID=ubuntu in /etc/os-release to determine
the distname, instead of doing this from checking kver substring like
what we did for RHEL / Oracle Linux

Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
---
 lib/tst_kvercmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/tst_kvercmp.c b/lib/tst_kvercmp.c
index dc3bb669b..349d45543 100644
--- a/lib/tst_kvercmp.c
+++ b/lib/tst_kvercmp.c
@@ -139,6 +139,11 @@ const char *tst_kvcmp_distname(const char *kver)
 	if (strstr(kver, ".el6"))
 		return "RHEL6";
 
+	// Special case for Ubuntu, kernel version cannot reveal the dist_name
+	int rc = WEXITSTATUS(system("grep -q ^ID=ubuntu /etc/os-release 2>/dev/null"));
+	if (rc == 0)
+		return "UBUNTU";
+
 	return NULL;
 }
 
-- 
2.17.1