Is it possible to hide the KVM/QEMU environment from a program which detects which platform it's running on?

[ethaniel]

I have a program which gathers system information (CPU, Motherboard, Hard drive models, etc) via udevadm to generate license information. Unfortunately, it's built so it won't allow itself to be run in a KVM/QEMU environment (which my whole system is based on).

Is there a way to make it think that it's running on a bare metal system?

[benzea]

I think that use-case is out of scope for umockdev. I am sure it is technically possible to manipulate the environment to the point that you can fool such a tool. But, the purpose of umockdev is to just provide enough in order to enable CI testing for software.

It is impossible to answer the question without knowing what that tool does.

[ethaniel]

The software is querying:

1. udevadm info --query=all --name=/dev/sda | grep ID_SERIAL=
2. /proc/cpuinfo

I was thinking if there is a way to override the request to these 2 items and replace the output that the software gets?

[ethaniel]

Solved it myself. Replaced /bin/udevadm with a bash script which outputs data that I need. And also did sudo mount --bind /cpuinfo.txt /proc/cpuinfo to fake the /proc/cpuinfo data

[martinpitt]

@ethaniel : Thanks for the clarification -- these parts are indeed what umockdev does. See the documented examples how to fake files in /proc, you can dump your desired /dev/sda with umockdev-record and load it in the test environment.

However, of course you need to run your program under umockdev-run for that. If you want everything in your system to believe the above fake data, without running under umockdev-run, then you need root privs as you did.