tmpfiles: don't attempt creation of device nodes when we run in a container
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index e70332c..323781f 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -38,6 +38,7 @@
#include <sys/param.h>
#include <glob.h>
#include <fnmatch.h>
+#include <sys/capability.h>
#include "log.h"
#include "util.h"
@@ -47,6 +48,7 @@
#include "label.h"
#include "set.h"
#include "conf-files.h"
+#include "capability.h"
/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
* them in the file system. This is intended to be used to create
@@ -764,7 +766,19 @@
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE: {
- mode_t file_type = (i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
+ mode_t file_type;
+
+ if (have_effective_cap(CAP_MKNOD) == 0) {
+ /* In a container we lack CAP_MKNOD. We
+ shouldnt attempt to create the device node in
+ that case to avoid noise, and we don't support
+ virtualized devices in containers anyway. */
+
+ log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
+ return 0;
+ }
+
+ file_type = (i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
u = umask(0);
label_context_set(i->path, file_type);