/* Returns a short identifier for the various VM implementations */
int detect_vm(void) {
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
- int r;
+ int r, dmi;
if (cached_found >= 0)
return cached_found;
/* We have to use the correct order here:
- * Some virtualization technologies do use KVM hypervisor but are
- * expected to be detected as something else. So detect DMI first.
*
- * An example is Virtualbox since version 5.0, which uses KVM backend.
- * Detection via DMI works corretly, the CPU ID would find KVM
- * only. */
- r = detect_vm_dmi();
+ * -> First try to detect Oracle Virtualbox, even if it uses KVM.
+ * -> Second try to detect from cpuid, this will report KVM for
+ * whatever software is used even if info in dmi is overwritten.
+ * -> Third try to detect from dmi. */
+
+ dmi = detect_vm_dmi();
+ if (dmi == VIRTUALIZATION_ORACLE) {
+ r = dmi;
+ goto finish;
+ }
+
+ r = detect_vm_cpuid();
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)
goto finish;
- r = detect_vm_cpuid();
+ r = dmi;
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)
#endif // 0
int running_in_chroot(void) {
- _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. */
+ int ret;
#if 0 /// elogind does not allow to ignore chroots, we are never init!
if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
return 0;
#endif // 0
- 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;
+ ret = files_same("/proc/1/root", "/", 0);
+ if (ret < 0)
+ return ret;
- return streq(self_mnt, pid1_mnt); /* Only if we live in the same namespace! */
+ return ret == 0;
}
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {