util: move virtualization detection into its own files, and extend return codes
This commit is contained in:
Lennart Poettering
parent
f2b33002cd
commit
b52aae1d93
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@ -613,6 +613,7 @@ noinst_LTLIBRARIES = \
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libsystemd_basic_la_SOURCES = \
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src/util.c \
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src/virt.c \
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src/label.c \
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src/hashmap.c \
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src/set.c \
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@ -25,9 +25,10 @@
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#include <string.h>
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#include "util.h"
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#include "virt.h"
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int main(int argc, char *argv[]) {
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int r;
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Virtualization r;
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const char *id;
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/* This is mostly intended to be used for scripts which want
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@ -43,5 +44,5 @@ int main(int argc, char *argv[]) {
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if (r > 0)
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puts(id);
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return r == 0;
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return r > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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@ -31,6 +31,7 @@
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#include "dbus-common.h"
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#include "polkit.h"
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#include "def.h"
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#include "virt.h"
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#define INTERFACE \
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" <interface name=\"org.freedesktop.hostname1\">\n" \
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@ -52,6 +52,7 @@
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#include "build.h"
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#include "strv.h"
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#include "def.h"
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#include "virt.h"
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static enum {
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ACTION_RUN,
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@ -49,6 +49,7 @@
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#include "sd-daemon.h"
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#include "ioprio.h"
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#include "readahead-common.h"
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#include "virt.h"
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/* fixme:
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*
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@ -41,6 +41,7 @@
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#include "sd-daemon.h"
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#include "ioprio.h"
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#include "readahead-common.h"
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#include "virt.h"
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static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
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@ -41,6 +41,7 @@
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#include "log.h"
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#include "umount.h"
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#include "util.h"
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#include "virt.h"
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#define TIMEOUT_USEC (5 * USEC_PER_SEC)
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#define FINALIZE_ATTEMPTS 50
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269
src/util.c
269
src/util.c
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@ -4267,275 +4267,6 @@ const char *default_term_for_tty(const char *tty) {
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return term;
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}
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/* Returns a short identifier for the various VM implementations */
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int detect_vm(const char **id) {
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#if defined(__i386__) || defined(__x86_64__)
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/* Both CPUID and DMI are x86 specific interfaces... */
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static const char *const dmi_vendors[] = {
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"/sys/class/dmi/id/sys_vendor",
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"/sys/class/dmi/id/board_vendor",
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"/sys/class/dmi/id/bios_vendor"
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};
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static const char dmi_vendor_table[] =
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"QEMU\0" "qemu\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMware\0" "vmware\0"
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"VMW\0" "vmware\0"
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"Microsoft Corporation\0" "microsoft\0"
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"innotek GmbH\0" "oracle\0"
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"Xen\0" "xen\0"
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"Bochs\0" "bochs\0";
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static const char cpuid_vendor_table[] =
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"XenVMMXenVMM\0" "xen\0"
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"KVMKVMKVM\0" "kvm\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMwareVMware\0" "vmware\0"
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/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
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"Microsoft Hv\0" "microsoft\0";
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uint32_t eax, ecx;
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union {
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uint32_t sig32[3];
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char text[13];
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} sig;
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unsigned i;
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const char *j, *k;
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bool hypervisor;
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/* http://lwn.net/Articles/301888/ */
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zero(sig);
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#if defined (__i386__)
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#define REG_a "eax"
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#define REG_b "ebx"
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#elif defined (__amd64__)
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#define REG_a "rax"
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#define REG_b "rbx"
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#endif
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/* First detect whether there is a hypervisor */
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eax = 1;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=c" (ecx)
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: "0" (eax)
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);
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hypervisor = !!(ecx & 0x80000000U);
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if (hypervisor) {
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/* There is a hypervisor, see what it is */
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eax = 0x40000000U;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" mov %%ebx, %1 \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
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: "0" (eax)
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);
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NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
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if (streq(sig.text, j)) {
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if (id)
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*id = k;
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return 1;
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}
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}
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for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
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char *s;
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int r;
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const char *found = NULL;
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if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
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if (r != -ENOENT)
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return r;
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continue;
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}
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NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
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if (startswith(s, j))
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found = k;
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free(s);
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if (found) {
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if (id)
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*id = found;
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return 1;
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}
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}
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if (hypervisor) {
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if (id)
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*id = "other-vm";
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return 1;
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}
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#endif
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return 0;
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}
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int detect_container(const char **id) {
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FILE *f;
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/* Unfortunately many of these operations require root access
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* in one way or another */
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if (geteuid() != 0)
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return -EPERM;
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if (running_in_chroot() > 0) {
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if (id)
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*id = "chroot";
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return 1;
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}
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/* /proc/vz exists in container and outside of the container,
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* /proc/bc only outside of the container. */
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if (access("/proc/vz", F_OK) >= 0 &&
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access("/proc/bc", F_OK) < 0) {
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if (id)
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*id = "openvz";
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return 1;
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}
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f = fopen("/proc/1/environ", "re");
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if (f) {
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bool done = false;
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do {
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char line[LINE_MAX];
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unsigned i;
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for (i = 0; i < sizeof(line)-1; i++) {
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int c;
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c = getc(f);
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if (_unlikely_(c == EOF)) {
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done = true;
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break;
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} else if (c == 0)
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break;
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line[i] = c;
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}
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line[i] = 0;
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if (streq(line, "container=lxc")) {
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fclose(f);
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if (id)
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*id = "lxc";
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return 1;
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} else if (streq(line, "container=systemd-nspawn")) {
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fclose(f);
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if (id)
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*id = "systemd-nspawn";
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return 1;
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} else if (startswith(line, "container=")) {
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fclose(f);
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if (id)
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*id = "other-container";
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return 1;
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}
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} while (!done);
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fclose(f);
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}
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f = fopen("/proc/self/cgroup", "re");
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if (f) {
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for (;;) {
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char line[LINE_MAX], *p;
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if (!fgets(line, sizeof(line), f))
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break;
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p = strchr(strstrip(line), ':');
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if (!p)
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continue;
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if (strncmp(p, ":ns:", 4))
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continue;
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if (!streq(p, ":ns:/")) {
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fclose(f);
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if (id)
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*id = "pidns";
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return 1;
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}
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}
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fclose(f);
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}
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return 0;
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}
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/* Returns a short identifier for the various VM/container implementations */
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int detect_virtualization(const char **id) {
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static __thread const char *cached_id = NULL;
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const char *_id;
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int r;
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if (_likely_(cached_id)) {
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if (cached_id == (const char*) -1)
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return 0;
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if (id)
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*id = cached_id;
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return 1;
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}
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if ((r = detect_container(&_id)) != 0)
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goto finish;
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r = detect_vm(&_id);
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finish:
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if (r > 0) {
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cached_id = _id;
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if (id)
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*id = _id;
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} else if (r == 0)
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cached_id = (const char*) -1;
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return r;
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}
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bool dirent_is_file(struct dirent *de) {
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assert(de);
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@ -406,10 +406,6 @@ bool tty_is_vc(const char *tty);
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int vtnr_from_tty(const char *tty);
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const char *default_term_for_tty(const char *tty);
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int detect_vm(const char **id);
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int detect_container(const char **id);
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int detect_virtualization(const char **id);
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void execute_directory(const char *directory, DIR *_d, char *argv[]);
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int kill_and_sigcont(pid_t pid, int sig);
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@ -39,6 +39,7 @@
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#include "util.h"
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#include "log.h"
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#include "macro.h"
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#include "virt.h"
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static bool is_vconsole(int fd) {
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unsigned char data[1];
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@ -0,0 +1,314 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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#include "virt.h"
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/* Returns a short identifier for the various VM implementations */
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int detect_vm(const char **id) {
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#if defined(__i386__) || defined(__x86_64__)
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/* Both CPUID and DMI are x86 specific interfaces... */
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static const char *const dmi_vendors[] = {
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"/sys/class/dmi/id/sys_vendor",
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"/sys/class/dmi/id/board_vendor",
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"/sys/class/dmi/id/bios_vendor"
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};
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static const char dmi_vendor_table[] =
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"QEMU\0" "qemu\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMware\0" "vmware\0"
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"VMW\0" "vmware\0"
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"Microsoft Corporation\0" "microsoft\0"
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"innotek GmbH\0" "oracle\0"
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"Xen\0" "xen\0"
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"Bochs\0" "bochs\0";
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static const char cpuid_vendor_table[] =
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"XenVMMXenVMM\0" "xen\0"
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"KVMKVMKVM\0" "kvm\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMwareVMware\0" "vmware\0"
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/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
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"Microsoft Hv\0" "microsoft\0";
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uint32_t eax, ecx;
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union {
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uint32_t sig32[3];
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char text[13];
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} sig;
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unsigned i;
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const char *j, *k;
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bool hypervisor;
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/* http://lwn.net/Articles/301888/ */
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zero(sig);
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#if defined (__i386__)
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#define REG_a "eax"
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#define REG_b "ebx"
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#elif defined (__amd64__)
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#define REG_a "rax"
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#define REG_b "rbx"
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#endif
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/* First detect whether there is a hypervisor */
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eax = 1;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=c" (ecx)
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: "0" (eax)
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);
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hypervisor = !!(ecx & 0x80000000U);
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if (hypervisor) {
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/* There is a hypervisor, see what it is */
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eax = 0x40000000U;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" mov %%ebx, %1 \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
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: "0" (eax)
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);
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NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
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if (streq(sig.text, j)) {
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if (id)
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*id = k;
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return 1;
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}
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}
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for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
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char *s;
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int r;
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const char *found = NULL;
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if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
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if (r != -ENOENT)
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return r;
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continue;
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}
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NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
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if (startswith(s, j))
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found = k;
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free(s);
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if (found) {
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if (id)
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*id = found;
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return 1;
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}
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}
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if (hypervisor) {
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if (id)
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*id = "other";
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return 1;
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}
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#endif
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return 0;
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}
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|
||||
int detect_container(const char **id) {
|
||||
FILE *f;
|
||||
|
||||
/* Unfortunately many of these operations require root access
|
||||
* in one way or another */
|
||||
|
||||
if (geteuid() != 0)
|
||||
return -EPERM;
|
||||
|
||||
if (running_in_chroot() > 0) {
|
||||
|
||||
if (id)
|
||||
*id = "chroot";
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* /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;
|
||||
}
|
||||
|
||||
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=systemd-nspawn")) {
|
||||
fclose(f);
|
||||
|
||||
if (id)
|
||||
*id = "systemd-nspawn";
|
||||
return 1;
|
||||
|
||||
} else if (startswith(line, "container=")) {
|
||||
fclose(f);
|
||||
|
||||
if (id)
|
||||
*id = "other";
|
||||
return 1;
|
||||
}
|
||||
|
||||
} while (!done);
|
||||
|
||||
fclose(f);
|
||||
}
|
||||
|
||||
f = fopen("/proc/self/cgroup", "re");
|
||||
if (f) {
|
||||
|
||||
for (;;) {
|
||||
char line[LINE_MAX], *p;
|
||||
|
||||
if (!fgets(line, sizeof(line), f))
|
||||
break;
|
||||
|
||||
p = strchr(strstrip(line), ':');
|
||||
if (!p)
|
||||
continue;
|
||||
|
||||
if (strncmp(p, ":ns:", 4))
|
||||
continue;
|
||||
|
||||
if (!streq(p, ":ns:/")) {
|
||||
fclose(f);
|
||||
|
||||
if (id)
|
||||
*id = "pidns";
|
||||
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
fclose(f);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* 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;
|
||||
}
|
||||
|
||||
if (v >= 0)
|
||||
cached_virt = v;
|
||||
|
||||
return v;
|
||||
}
|
||||
|
|
@ -0,0 +1,38 @@
|
|||
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||
|
||||
#ifndef foovirthfoo
|
||||
#define foovirthfoo
|
||||
|
||||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2011 Lennart Poettering
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd is distributed in the hope that it will be useful, but
|
||||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
int detect_vm(const char **id);
|
||||
int detect_container(const char **id);
|
||||
|
||||
typedef enum Virtualization {
|
||||
VIRTUALIZATION_NONE = 0,
|
||||
VIRTUALIZATION_VM,
|
||||
VIRTUALIZATION_CONTAINER,
|
||||
_VIRTUALIZATION_MAX,
|
||||
_VIRTUALIZATION_INVALID = -1
|
||||
} Virtualization;
|
||||
|
||||
Virtualization detect_virtualization(const char **id);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue