#include "util.h"
#include "virt.h"
+#include "fileio.h"
/* Returns a short identifier for the various VM implementations */
int detect_vm(const char **id) {
+ _cleanup_free_ char *cpuinfo_contents = NULL;
+ int r;
#if defined(__i386__) || defined(__x86_64__)
/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
"Microsoft Hv\0" "microsoft\0";
+ static __thread int cached_found = -1;
+ static __thread const char *cached_id = NULL;
+
uint32_t eax, ecx;
union {
uint32_t sig32[3];
char text[13];
- } sig;
+ } sig = {};
unsigned i;
const char *j, *k;
bool hypervisor;
+ _cleanup_free_ char *hvtype = NULL;
+ const char *_id = NULL;
+
+ if (_likely_(cached_found >= 0)) {
+
+ if (id)
+ *id = cached_id;
+
+ return cached_found;
+ }
+
+ /* Try high-level hypervisor sysfs file first:
+ *
+ * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */
+ r = read_one_line_file("/sys/hypervisor/type", &hvtype);
+ if (r >= 0) {
+ if (streq(hvtype, "xen")) {
+ _id = "xen";
+ r = 1;
+ goto finish;
+ }
+ } else if (r != -ENOENT)
+ return r;
/* http://lwn.net/Articles/301888/ */
- zero(sig);
#if defined (__i386__)
#define REG_a "eax"
NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
if (streq(sig.text, j)) {
-
- if (id)
- *id = k;
-
- return 1;
+ _id = k;
+ r = 1;
+ goto finish;
}
}
for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
- char *s;
- int r;
- const char *found = NULL;
+ _cleanup_free_ char *s = NULL;
- if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
+ r = read_one_line_file(dmi_vendors[i], &s);
+ if (r < 0) {
if (r != -ENOENT)
return r;
}
NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
- if (startswith(s, j))
- found = k;
- free(s);
-
- if (found) {
- if (id)
- *id = found;
+ if (startswith(s, j)) {
+ _id = k;
+ r = 1;
+ goto finish;
+ }
+ }
- return 1;
- }
+ if (hypervisor || hvtype) {
+ _id = "other";
+ r = 1;
+ goto finish;
}
- if (hypervisor) {
- if (id)
- *id = "other";
+#endif
- return 1;
+ /* Detect User-Mode Linux by reading /proc/cpuinfo */
+ r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
+ if (r < 0)
+ return r;
+ if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
+ _id = "uml";
+ r = 1;
+ goto finish;
}
-#endif
- return 0;
+ r = 0;
+
+finish:
+ cached_found = r;
+
+ cached_id = _id;
+ if (id)
+ *id = _id;
+
+ return r;
}
int detect_container(const char **id) {
- FILE *f;
- /* Unfortunately many of these operations require root access
- * in one way or another */
+ static __thread int cached_found = -1;
+ static __thread const char *cached_id = NULL;
- if (geteuid() != 0)
- return -EPERM;
+ _cleanup_free_ char *e = NULL;
+ const char *_id = NULL;
+ int r;
- if (running_in_chroot() > 0) {
+ if (_likely_(cached_found >= 0)) {
if (id)
- *id = "chroot";
+ *id = cached_id;
+
+ return cached_found;
+ }
+
+ /* Unfortunately many of these operations require root access
+ * in one way or another */
- return 1;
+ r = running_in_chroot();
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ _id = "chroot";
+ goto finish;
}
/* /proc/vz exists in container and outside of the container,
* /proc/bc only outside of the container. */
if (access("/proc/vz", F_OK) >= 0 &&
access("/proc/bc", F_OK) < 0) {
-
- if (id)
- *id = "openvz";
-
- return 1;
+ _id = "openvz";
+ r = 1;
+ goto finish;
}
- f = fopen("/proc/1/environ", "re");
- if (f) {
- bool done = false;
-
- do {
- char line[LINE_MAX];
- unsigned i;
-
- for (i = 0; i < sizeof(line)-1; i++) {
- int c;
-
- c = getc(f);
- if (_unlikely_(c == EOF)) {
- done = true;
- break;
- } else if (c == 0)
- break;
-
- line[i] = c;
- }
- line[i] = 0;
-
- if (streq(line, "container=lxc")) {
- fclose(f);
-
- if (id)
- *id = "lxc";
- return 1;
-
- } else if (streq(line, "container=lxc-libvirt")) {
- fclose(f);
-
- if (id)
- *id = "lxc-libvirt";
- return 1;
-
- } else if (streq(line, "container=systemd-nspawn")) {
- fclose(f);
-
- if (id)
- *id = "systemd-nspawn";
- return 1;
-
- } else if (startswith(line, "container=")) {
- fclose(f);
+ r = getenv_for_pid(1, "container", &e);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ goto finish;
- if (id)
- *id = "other";
- return 1;
- }
+ /* We only recognize a selected few here, since we want to
+ * enforce a redacted namespace */
+ if (streq(e, "lxc"))
+ _id ="lxc";
+ else if (streq(e, "lxc-libvirt"))
+ _id = "lxc-libvirt";
+ else if (streq(e, "systemd-nspawn"))
+ _id = "systemd-nspawn";
+ else
+ _id = "other";
- } while (!done);
+finish:
+ cached_found = r;
- fclose(f);
- }
+ cached_id = _id;
+ if (id)
+ *id = _id;
- return 0;
+ return r;
}
/* Returns a short identifier for the various VM/container implementations */
Virtualization detect_virtualization(const char **id) {
-
- static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID;
- static __thread const char *cached_id = NULL;
-
- const char *_id;
int r;
- Virtualization v;
-
- if (_likely_(cached_virt >= 0)) {
-
- if (id && cached_virt > 0)
- *id = cached_id;
-
- return cached_virt;
- }
-
- r = detect_container(&_id);
- if (r < 0) {
- v = r;
- goto finish;
- } else if (r > 0) {
- v = VIRTUALIZATION_CONTAINER;
- goto finish;
- }
- r = detect_vm(&_id);
- if (r < 0) {
- v = r;
- goto finish;
- } else if (r > 0) {
- v = VIRTUALIZATION_VM;
- goto finish;
- }
-
- v = VIRTUALIZATION_NONE;
-
-finish:
- if (v > 0) {
- cached_id = _id;
-
- if (id)
- *id = _id;
- }
+ r = detect_container(id);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return VIRTUALIZATION_CONTAINER;
- if (v >= 0)
- cached_virt = v;
+ r = detect_vm(id);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return VIRTUALIZATION_VM;
- return v;
+ return VIRTUALIZATION_NONE;
}
~ianmdlvl / elogind.git / blobdiff