[CRIU] [PATCH v2] crtools: also print the current kernel version

[Adrian Reber]

From: Adrian Reber <areber at redhat.com>

In addition to writing the CRIU version to the log file this adds the
current kernel version to the log file:

(00.000008) Version: 3.5 (gitid v3.5-511-ga8cc6cf)
(00.000303) Running on node01 Linux 3.10.0-513.el7.x86_64 #1 SMP Tue Feb 29 06:78:90 EST 2017 x86_64

v2:
 - small changes as suggested by Dmitry (thanks)

Signed-off-by: Adrian Reber <areber at redhat.com>
---
 criu/crtools.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/criu/crtools.c b/criu/crtools.c
index 293d631..5f00538 100644
--- a/criu/crtools.c
+++ b/criu/crtools.c
@@ -21,6 +21,7 @@
 
 #include <sys/time.h>
 #include <sys/resource.h>
+#include <sys/utsname.h>
 
 #include "int.h"
 #include "page.h"
@@ -421,6 +422,20 @@ static void init_configuration(int argc, char *argv[], int defaults_forbidden)
 	}
 }
 
+static void print_kernel_version(void)
+{
+	struct utsname buf;
+
+	if (uname(&buf) < 0) {
+		pr_perror("Reading kernel version failed!");
+		/* This pretty unlikely, just keep on running. */
+		return;
+	}
+
+	pr_info("Running on %s %s %s %s %s\n", buf.nodename, buf.sysname,
+		buf.release, buf.version, buf.machine);
+}
+
 int main(int argc, char *argv[], char *envp[])
 {
 #define PARSING_GLOBAL_CONF	1
@@ -967,6 +982,9 @@ int main(int argc, char *argv[], char *envp[])
 	compel_log_init(vprint_on_level, log_get_loglevel());
 
 	pr_info("Version: %s (gitid %s)\n", CRIU_VERSION, CRIU_GITID);
+
+	print_kernel_version();
+
 	if (opts.deprecated_ok)
 		pr_debug("DEPRECATED ON\n");
 
-- 
1.8.3.1