forked from coreos/ignition
/
qemu.go
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/
qemu.go
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// Copyright 2016 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// The QEMU provider fetches a local configuration from the firmware config
// interface (opt/com.coreos/config).
package qemu
import (
"io/ioutil"
"os"
"os/exec"
"github.com/coreos/ignition/config/validate/report"
"github.com/coreos/ignition/internal/config/types"
"github.com/coreos/ignition/internal/providers/util"
"github.com/coreos/ignition/internal/resource"
)
const (
firmwareConfigPath = "/sys/firmware/qemu_fw_cfg/by_name/opt/com.coreos/config/raw"
)
func FetchConfig(f resource.Fetcher) (types.Config, report.Report, error) {
_, err := f.Logger.LogCmd(exec.Command("modprobe", "qemu_fw_cfg"), "loading QEMU firmware config module")
if err != nil {
return types.Config{}, report.Report{}, err
}
data, err := ioutil.ReadFile(firmwareConfigPath)
if os.IsNotExist(err) {
f.Logger.Info("QEMU firmware config was not found. Ignoring...")
} else if err != nil {
f.Logger.Err("couldn't read QEMU firmware config: %v", err)
return types.Config{}, report.Report{}, err
}
return util.ParseConfig(f.Logger, data)
}