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nspawn: make -U a tiny bit smarter
author
Lennart Poettering
<lennart@poettering.net>
Fri, 22 Apr 2016 12:10:09 +0000
(14:10 +0200)
committer
Sven Eden
<yamakuzure@gmx.net>
Fri, 16 Jun 2017 08:12:58 +0000
(10:12 +0200)
With this change -U will turn on user namespacing only if the kernel actually
supports it and otherwise gracefully degrade to non-userns mode.
src/basic/user-util.h
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diff --git
a/src/basic/user-util.h
b/src/basic/user-util.h
index 8e652584d206e27e5c1a03d4b6455128bdc3899b..d010b2bf505606e0b1f1613bb743600279773fce 100644
(file)
--- 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);
@@
-69,3
+70,7
@@
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;
+}