fs-util: add new CHASE_NON_EXISTING flag to chase_symlinks()

[elogind.git] / src / basic / virt.c

diff --git a/src/basic/virt.c b/src/basic/virt.c
index c935c534bb99863695fdf8b3cec3ad4927bfa383..3957a5a8c5abde7fd1552e1df328845c64aadcd6 100644 (file)
--- a/src/basic/virt.c
+++ b/src/basic/virt.c
@@ -559,18 +559,32 @@ int running_in_userns(void) {
 #endif // 0
 
 int running_in_chroot(void) {
-        int ret;
+        _cleanup_free_ char *self_mnt = NULL, *pid1_mnt = NULL;
+        int r;
+
+        /* Try to detect whether we are running in a chroot() environment. Specifically, check whether we have a
+         * different root directory than PID 1, even though we live in the same mount namespace as it. */
 
 #if 0 /// elogind does not allow to ignore chroots, we are never init!
         if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
                 return 0;
 #endif // 0
 
-        ret = files_same("/proc/1/root", "/");
-        if (ret < 0)
-                return ret;
+        r = files_same("/proc/1/root", "/");
+        if (r < 0)
+                return r;
+        if (r > 0)
+                return 0;
+
+        r = readlink_malloc("/proc/self/ns/mnt", &self_mnt);
+        if (r < 0)
+                return r;
+
+        r = readlink_malloc("/proc/1/ns/mnt", &pid1_mnt);
+        if (r < 0)
+                return r;
 
-        return ret == 0;
+        return streq(self_mnt, pid1_mnt); /* Only if we live in the same namespace! */
 }
 
 static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {