tests: log api reboot test failures

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

src/tests/api_reboot.c

@@ -29,17 +29,46 @@
 
 #include "lxc/lxccontainer.h"
 #include "lxctest.h"
+#include "utils.h"
+
+#ifndef HAVE_STRLCPY
+#include "include/strlcpy.h"
+#endif
+
+#define TSTNAME "lxc-api-reboot"
 
 int main(int argc, char *argv[])
 {
 	int i;
 	struct lxc_container *c;
 	int ret = EXIT_FAILURE;
+	struct lxc_log log;
+	char template[sizeof(P_tmpdir"/reboot_XXXXXX")];
+
+	(void)strlcpy(template, P_tmpdir"/reboot_XXXXXX", sizeof(template));
+
+	i = lxc_make_tmpfile(template, false);
+	if (i < 0) {
+		lxc_error("Failed to create temporary log file for container %s\n", TSTNAME);
+		exit(EXIT_FAILURE);
+	} else {
+		lxc_debug("Using \"%s\" as temporary log file for container %s\n", template, TSTNAME);
+		close(i);
+	}
+
+	log.name = TSTNAME;
+	log.file = template;
+	log.level = "TRACE";
+	log.prefix = "reboot";
+	log.quiet = false;
+	log.lxcpath = NULL;
+	if (lxc_log_init(&log))
+		exit(ret);
 
 	/* Test that the reboot() API function properly waits for containers to
 	 * restart.
 	 */
-	c = lxc_container_new("reboot", NULL);
+	c = lxc_container_new(TSTNAME, NULL);
 	if (!c) {
 		lxc_error("%s", "Failed to create container \"reboot\"");
 		exit(ret);
@@ -120,8 +149,24 @@ int main(int argc, char *argv[])
 on_error_put:
 	lxc_container_put(c);
 
-	if (ret == EXIT_SUCCESS)
+	if (ret == EXIT_SUCCESS) {
 		lxc_debug("%s\n", "All reboot tests passed");
+	} else {
+		int fd;
+
+		fd = open(template, O_RDONLY);
+		if (fd >= 0) {
+			char buf[4096];
+			ssize_t buflen;
+			while ((buflen = read(fd, buf, 1024)) > 0) {
+				buflen = write(STDERR_FILENO, buf, buflen);
+				if (buflen <= 0)
+					break;
+			}
+			close(fd);
+		}
+	}
+	(void)unlink(template);
 
 	exit(ret);
 }