cov: annotate to silent some coverity warning

daemons/dmeventd/dmeventd.c

@@ -1441,7 +1441,8 @@ static int _open_fifo(const char *path)
 	} else if (!S_ISFIFO(st.st_mode) || st.st_uid ||
 		   (st.st_mode & (S_IEXEC | S_IRWXG | S_IRWXO))) {
 		log_warn("WARNING: %s has wrong attributes: Replacing.", path);
-		if (unlink(path)) {
+		/* coverity[toctou]  don't care, path is going to be recreated */
+		if (unlink(path) && (errno != ENOENT)) {
 			log_sys_error("unlink", path);
 			return -1;
 		}
@@ -1449,6 +1450,7 @@ static int _open_fifo(const char *path)
 
 	/* Create fifo. */
 	(void) dm_prepare_selinux_context(path, S_IFIFO);
+	/* coverity[toctou]  revalidating things again */
 	if ((mkfifo(path, 0600) == -1) && errno != EEXIST) {
 		log_sys_error("mkfifo", path);
 		(void) dm_prepare_selinux_context(NULL, 0);

lib/metadata/lv_manip.c

@@ -7167,6 +7167,8 @@ char *generate_lv_name(struct volume_group *vg, const char *format,
 			high = i;
 	}
 
+	/* only internally passed %d are supported */
+	/* coverity[non_const_printf_format_string] */
 	if (dm_snprintf(buffer, len, format, high + 1) < 0)
 		return NULL;
 

tools/lvmcmdline.c

@@ -3555,6 +3555,7 @@ static void _nonroot_warning(void)
 		log_warn("WARNING: Running as a non-root user. Functionality may be unavailable.");
 }
 
+/* coverity[-tainted_data_sink:arg-1] */
 int lvm2_main(int argc, char **argv)
 {
 	const char *base;

tools/vgcfgbackup.c

@@ -33,6 +33,7 @@ static char *_expand_filename(const char *template, const char *vg_name,
 		return NULL;
 	}
 
+	/* coverity[non_const_printf_format_string] */
 	if (dm_snprintf(filename, PATH_MAX, template, vg_name) < 0) {
 		log_error("Error processing filename template %s",
 			   template);