depmod: Don't insert comment in modules.devname if otherwise empty
This allows tools to detect the file as empty, such as via systemd's
ConditionFileNotEmpty.
diff --git a/tools/depmod.c b/tools/depmod.c
index a585d47..6e9bb4d 100644
--- a/tools/depmod.c
+++ b/tools/depmod.c
@@ -1999,8 +1999,7 @@
static int output_devname(struct depmod *depmod, FILE *out)
{
size_t i;
-
- fputs("# Device nodes to trigger on-demand module loading.\n", out);
+ bool empty = true;
for (i = 0; i < depmod->modules.count; i++) {
const struct mod *mod = depmod->modules.array[i];
@@ -2036,10 +2035,15 @@
}
if (devname != NULL) {
- if (type != '\0')
+ if (type != '\0') {
+ if (empty) {
+ fputs("# Device nodes to trigger on-demand module loading.\n",
+ out);
+ empty = false;
+ }
fprintf(out, "%s %s %c%u:%u\n", mod->modname,
devname, type, major, minor);
- else
+ } else
ERR("Module '%s' has devname (%s) but "
"lacks major and minor information. "
"Ignoring.\n", mod->modname, devname);