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out-of-tree/qemu/README.md

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# out-of-tree/qemu
Qemu wrapper for kernel-related CI tasks. Supports *GNU/Linux* and *macOS*.
Features:
* Uses upstream virtualization -- KVM in GNU/Linux and Hypervisor.framework in macOS.
* Run files and kernel modules directly from local filesystem. No need to copy byself!
* Run commands inside qemu virtual machine at the same way as you run in it locally.
## Installation
$ go get github.com/jollheef/out-of-tree/qemu
### Generate root image
First of all we need to generate rootfs for run qemu.
#### Install qemu and docker
##### GNU/Linux
$ sudo apt install -y qemu docker
##### macOS
Note: qemu on macOS since v2.12 (24 April 2018) supports Hypervisor.framework.
$ brew install qemu
$ brew cask install docker
#### Generate image
$ cd $GOPATH/src/github.com/jollheef/out-of-tree/tools/qemu-debian-img
$ ./bootstrap.sh
### Fill configuration file
$ $EDITOR $GOPATH/src/github.com/jollheef/out-of-tree/qemu/test.config.go
### Run tests
$ go test -v
## Usage
$ go get github.com/jollheef/out-of-tree/qemu
Minimal example:
kernel := qemu.Kernel{
Name: "Some kernel name",
KernelPath: "/path/to/vmlinuz",
InitrdPath: "/path/to/initrd", // if required
}
q, err := qemu.NewQemuSystem(qemu.X86_64, kernel, "/path/to/qcow2")
if err != nil {
log.Fatal(err)
}
if err = q.Start(); err != nil {
log.Fatal(err)
}
defer q.Stop()
output, err = q.Command("root", "echo Hello, World!")
if err != nil {
log.Fatal(err)
}
// output == "Hello, World!\n"
More information and list of all functions see at go documentation project, or just run locally:
$ godoc github.com/jollheef/out-of-tree/qemu