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basic/virt: provide a nicer message is /proc/cpuinfo is not available

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$ sudo systemd-run -p RootDirectory=/usr -E LD_LIBRARY_PATH=/lib/systemd/ -E SYSTEMD_LOG_LEVEL=debug /bin/systemd-detect-virt

Before
systemd-detect-virt[18498]: No virtualization found in DMI
systemd-detect-virt[18498]: No virtualization found in CPUID
systemd-detect-virt[18498]: Virtualization XEN not found, /proc/xen does not exist
systemd-detect-virt[18498]: This platform does not support /proc/device-tree
systemd-detect-virt[18498]: Failed to check for virtualization: No such file or directory

The first four lines are at debug level, so the user would only see that last
one usually, which is not very enlightening.

This now becomes:
systemd-detect-virt[21172]: No virtualization found in DMI
systemd-detect-virt[21172]: No virtualization found in CPUID
systemd-detect-virt[21172]: Virtualization XEN not found, /proc/xen does not exist
systemd-detect-virt[21172]: This platform does not support /proc/device-tree
systemd-detect-virt[21172]: /proc/cpuinfo not found, assuming no UML virtualization.
systemd-detect-virt[21172]: This platform does not support /proc/sysinfo
systemd-detect-virt[21172]: Found VM virtualization none
systemd-detect-virt[21172]: none

We do more checks, which is good too.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-02-23 12:49:15 +01:00 committed by Lennart Poettering
parent a2896612a3
commit ef2a48aa01
1 changed files with 10 additions and 6 deletions
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16
src/basic/virt.c
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@ -282,6 +282,10 @@ static int detect_vm_uml(void) {
/* Detect User-Mode Linux by reading /proc/cpuinfo */
r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
if (r == -ENOENT) {
log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
return VIRTUALIZATION_NONE;
}
if (r < 0)
return r;
@ -290,7 +294,7 @@ static int detect_vm_uml(void) {
return VIRTUALIZATION_UML;
}
log_debug("No virtualization found in /proc/cpuinfo.");
log_debug("UML virtualization not found in /proc/cpuinfo.");
return VIRTUALIZATION_NONE;
}
@ -604,16 +608,16 @@ int running_in_userns(void) {
}
int running_in_chroot(void) {
int ret;
int r;
if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
return 0;
ret = files_same("/proc/1/root", "/", 0);
if (ret < 0)
return ret;
r = files_same("/proc/1/root", "/", 0);
if (r < 0)
return r;
return ret == 0;
return r == 0;
}
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {