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authorLennart Poettering <lennart@poettering.net>2016-04-22 14:10:09 +0200
committerLennart Poettering <lennart@poettering.net>2016-04-25 12:16:02 +0200
commitccabee0d6465f06b9d339cf449fd8eea0db13373 (patch)
treed9742d9281a08fa46d9840619ba21a4746a0b30a /src/basic/user-util.h
parentd2e5535f9d945db3ca20ed264e1fe1ce99707bba (diff)
nspawn: make -U a tiny bit smarter
With this change -U will turn on user namespacing only if the kernel actually supports it and otherwise gracefully degrade to non-userns mode.
Diffstat (limited to 'src/basic/user-util.h')
-rw-r--r--src/basic/user-util.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/basic/user-util.h b/src/basic/user-util.h
index c23f1d485d..8026eca3f4 100644
--- a/src/basic/user-util.h
+++ b/src/basic/user-util.h
@@ -21,6 +21,7 @@
#include <stdbool.h>
#include <sys/types.h>
+#include <unistd.h>
bool uid_is_valid(uid_t uid);
@@ -63,3 +64,7 @@ int take_etc_passwd_lock(const char *root);
#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
+
+static inline bool userns_supported(void) {
+ return access("/proc/self/uid_map", F_OK) >= 0;
+}