criu: print criu and kernel versions from log_init()

log_init() opens a log file. We want to have criu and kernel versions in
each log file, so it looks reasonable to print them from log_init().

Without this patch, versions are not printed, if criu is called in the
swrk mode.
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Acked-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-service.c

@@ -307,8 +307,6 @@ static int setup_opts_from_req(int sk, CriuOpts *req)
 		goto err;
 	}
 
-	print_versions();
-
 	/* checking flags from client */
 	if (req->has_leave_running && req->leave_running)
 		opts.final_state = TASK_ALIVE;

criu/crtools.c

@@ -727,8 +727,6 @@ int main(int argc, char *argv[], char *envp[])
 	if (log_init(opts.output))
 		return 1;
 
-	print_versions();
-
 	if (opts.deprecated_ok)
 		pr_debug("DEPRECATED ON\n");
 

criu/include/util.h

@@ -377,6 +377,4 @@ static inline void print_stack_trace(pid_t pid) {}
 		___ret;									\
 	})
 
-extern void print_versions(void);
-
 #endif /* __CR_UTIL_H__ */

criu/log.c

@@ -9,6 +9,7 @@
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/resource.h>
+#include <sys/utsname.h>
 
 #include <fcntl.h>
 
@@ -20,6 +21,8 @@
 #include "rst-malloc.h"
 #include "common/lock.h"
 #include "string.h"
+#include "version.h"
+
 #include "../soccr/soccr.h"
 #include "compel/log.h"
 
@@ -135,6 +138,22 @@ char *log_first_err(void)
 	return first_err->s;
 }
 
+static void print_versions(void)
+{
+	struct utsname buf;
+
+	pr_info("Version: %s (gitid %s)\n", CRIU_VERSION, CRIU_GITID);
+
+	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 log_init(const char *output)
 {
 	int new_logfd, fd;
@@ -167,6 +186,8 @@ int log_init(const char *output)
 	if (fd < 0)
 		goto err;
 
+	print_versions();
+
 	return 0;
 
 err:

criu/util.c

@@ -34,7 +34,6 @@
 #include <netinet/tcp.h>
 #include <sched.h>
 #include <ctype.h>
-#include <sys/utsname.h>
 
 #include "bitops.h"
 #include "page.h"
@@ -54,7 +53,6 @@
 #include "cr-service.h"
 #include "files.h"
 #include "pstree.h"
-#include "version.h"
 
 #include "cr-errno.h"
 
@@ -1517,19 +1515,3 @@ void print_stack_trace(pid_t pid)
 	free(strings);
 }
 #endif
-
-void print_versions(void)
-{
-	struct utsname buf;
-
-	pr_info("Version: %s (gitid %s)\n", CRIU_VERSION, CRIU_GITID);
-
-	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);
-}