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https://github.com/aljazceru/kata-containers.git
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bc030d13d1
This change adds an additional parameter to CreateCloudInitISO that allows users more control over the newly created xorriso process. They can for instance specify the user under which the new qemu process should run and which capabilities should be retained in the child xorriso process. Signed-off-by: Mark Ryan <mark.d.ryan@intel.com>
77 lines
2.6 KiB
Go
77 lines
2.6 KiB
Go
/*
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// Copyright (c) 2017 Intel Corporation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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*/
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package qemu
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import (
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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"syscall"
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)
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// CreateCloudInitISO creates a cloud-init ConfigDrive ISO image. This is
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// useful for configuring newly booted VMs. Before it can create the ISO
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// image it needs to create a file tree with the various files that will
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// make up the image. This directory is created under scratchDir and is
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// deleted when when the function returns, successfully or otherwise. ctx is
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// a context that can be used to timeout or cancel the image creation.
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// isoPath contains the desired path of the ISO image to be created. The
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// userdata and metadata parameters are byte slices that contain the
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// ConfigDrive userdata and metadata that will be stored with the ISO image.
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// The attrs parameter can be used to control aspects of the newly created
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// qemu process, such as the user and group under which it runs. It may be nil.
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func CreateCloudInitISO(ctx context.Context, scratchDir, isoPath string,
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userData, metaData []byte, attr *syscall.SysProcAttr) error {
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configDrivePath := path.Join(scratchDir, "clr-cloud-init")
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dataDirPath := path.Join(configDrivePath, "openstack", "latest")
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metaDataPath := path.Join(dataDirPath, "meta_data.json")
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userDataPath := path.Join(dataDirPath, "user_data")
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defer func() {
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_ = os.RemoveAll(configDrivePath)
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}()
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err := os.MkdirAll(dataDirPath, 0755)
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if err != nil {
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return fmt.Errorf("Unable to create config drive directory %s : %v",
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dataDirPath, err)
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}
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err = ioutil.WriteFile(metaDataPath, metaData, 0644)
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if err != nil {
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return fmt.Errorf("Unable to create %s : %v", metaDataPath, err)
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}
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err = ioutil.WriteFile(userDataPath, userData, 0644)
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if err != nil {
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return fmt.Errorf("Unable to create %s : %v", userDataPath, err)
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}
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cmd := exec.CommandContext(ctx, "xorriso", "-as", "mkisofs", "-R", "-V", "config-2",
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"-o", isoPath, configDrivePath)
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cmd.SysProcAttr = attr
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err = cmd.Run()
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if err != nil {
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return fmt.Errorf("Unable to create cloudinit iso image %v", err)
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}
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return nil
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}
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