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detect-virt: detect User-Mode Linux

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In a User-Mode Linux session:

  $ systemd-detect-virt
  none

Although it is possible to reliably detect virtualization:

  $ cat /proc/cpuinfo
  processor       : 0
  vendor_id       : User Mode Linux
  model name      : UML
  mode            : skas
  host            : Linux kytes 3.11.0-rc1-00009-ge5fd680 (...)
  bogomips        : 7007.43

So, grep for the string "\nvendor_id\t: User Mode Linux\n" in
/proc/cpuinfo, and say "uml" when asked.
This commit is contained in:
Ramkumar Ramachandra 2013-07-16 16:44:40 +05:30 committed by Lennart Poettering
parent 36c0868b67
commit 7080ea16b5
3 changed files with 13 additions and 0 deletions
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1
man/systemd-detect-virt.xml
View File

@ -70,6 +70,7 @@
<varname>microsoft</varname>,
<varname>oracle</varname>, <varname>xen</varname>,
<varname>bochs</varname>, <varname>chroot</varname>,
<varname>uml</varname>,
<varname>openvz</varname>, <varname>lxc</varname>,
<varname>lxc-libvirt</varname>,
<varname>systemd-nspawn</varname>.</para>

1
man/systemd.unit.xml
View File

@ -969,6 +969,7 @@
<varname>xen</varname>,
<varname>bochs</varname>,
<varname>chroot</varname>,
<varname>uml</varname>,
<varname>openvz</varname>,
<varname>lxc</varname>,
<varname>lxc-libvirt</varname>,

11
src/shared/virt.c
View File

@ -67,6 +67,7 @@ int detect_vm(const char **id) {
const char *j, *k;
bool hypervisor;
_cleanup_free_ char *hvtype = NULL;
_cleanup_free_ char *cpuinfo_contents = NULL;
int r;
/* Try high-level hypervisor sysfs file first:
@ -164,6 +165,16 @@ int detect_vm(const char **id) {
}
#endif
/* 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";
return 1;
}
return 0;
}