tmpfiles: don't attempt creation of device nodes when we run in a container

[elogind.git] / src / tmpfiles / tmpfiles.c

diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index f8d89218c9a4f3825a2b3c1c087b58a8ce546949..323781f9737ac547aac6ff5693f7626d94f6f6ff 100644 (file)
--- 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
@@ -260,8 +262,7 @@ static int dir_cleanup(
                 sub_path = NULL;
 
                 if (asprintf(&sub_path, "%s/%s", p, dent->d_name) < 0) {
-                        log_error("Out of memory.");
-                        r = -ENOMEM;
+                        r = log_oom();
                         goto finish;
                 }
 
@@ -765,7 +766,19 @@ static int create_item(Item *i) {
 
         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);
@@ -969,10 +982,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
         assert(buffer);
 
         i = new0(Item, 1);
-        if (!i) {
-                log_error("Out of memory.");
-                return -ENOMEM;
-        }
+        if (!i)
+                return log_oom();
 
         if (sscanf(buffer,
                    "%c "
@@ -998,10 +1009,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
                 n += strspn(buffer+n, WHITESPACE);
                 if (buffer[n] != 0 && (buffer[n] != '-' || buffer[n+1] != 0)) {
                         i->argument = unquote(buffer+n, "\"");
-                        if (!i->argument) {
-                                log_error("Out of memory.");
-                                return -ENOMEM;
-                        }
+                        if (!i->argument)
+                                return log_oom();
                 }
         }
 
@@ -1302,7 +1311,7 @@ static char *resolve_fragment(const char *fragment, const char **search_paths) {
         STRV_FOREACH(p, search_paths) {
                 resolved_path = strjoin(*p, "/", fragment, NULL);
                 if (resolved_path == NULL) {
-                        log_error("Out of memory.");
+                        log_oom();
                         return NULL;
                 }
 
@@ -1337,7 +1346,7 @@ int main(int argc, char *argv[]) {
         globs = hashmap_new(string_hash_func, string_compare_func);
 
         if (!items || !globs) {
-                log_error("Out of memory.");
+                log_oom();
                 r = EXIT_FAILURE;
                 goto finish;
         }