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agentartifacts.go
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/
agentartifacts.go
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package image
import (
"context"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/openshift/assisted-image-service/pkg/isoeditor"
"github.com/openshift/installer/pkg/asset"
"github.com/openshift/installer/pkg/asset/agent"
config "github.com/openshift/installer/pkg/asset/agent/agentconfig"
"github.com/openshift/installer/pkg/asset/agent/manifests"
"github.com/openshift/installer/pkg/asset/agent/mirror"
)
const (
// bootArtifactsPath is the path where boot files are created.
// e.g. initrd, kernel and rootfs.
bootArtifactsPath = "boot-artifacts"
)
// AgentArtifacts is an asset that generates all the artifacts that could be used
// for a subsequent generation of an ISO image or PXE files, starting from the
// content of the rhcos image enriched with agent specific files.
type AgentArtifacts struct {
CPUArch string
RendezvousIP string
TmpPath string
IgnitionByte []byte
Kargs string
ISOPath string
BootArtifactsBaseURL string
}
// Dependencies returns the assets on which the AgentArtifacts asset depends.
func (a *AgentArtifacts) Dependencies() []asset.Asset {
return []asset.Asset{
&Ignition{},
&Kargs{},
&BaseIso{},
&manifests.AgentManifests{},
&manifests.AgentClusterInstall{},
&mirror.RegistriesConf{},
&config.AgentConfig{},
}
}
// Generate generates the configurations for the agent ISO image and PXE assets.
func (a *AgentArtifacts) Generate(_ context.Context, dependencies asset.Parents) error {
ignition := &Ignition{}
kargs := &Kargs{}
baseIso := &BaseIso{}
agentManifests := &manifests.AgentManifests{}
agentClusterInstall := &manifests.AgentClusterInstall{}
registriesConf := &mirror.RegistriesConf{}
agentconfig := &config.AgentConfig{}
dependencies.Get(ignition, kargs, baseIso, agentManifests, agentClusterInstall, registriesConf, agentconfig)
ignitionByte, err := json.Marshal(ignition.Config)
if err != nil {
return err
}
a.CPUArch = ignition.CPUArch
a.RendezvousIP = ignition.RendezvousIP
a.IgnitionByte = ignitionByte
a.ISOPath = baseIso.File.Filename
a.Kargs = kargs.KernelCmdLine()
if agentconfig.Config != nil {
a.BootArtifactsBaseURL = strings.Trim(agentconfig.Config.BootArtifactsBaseURL, "/")
}
var agentTuiFiles []string
if agentClusterInstall.GetExternalPlatformName() != agent.ExternalPlatformNameOci {
agentTuiFiles, err = a.fetchAgentTuiFiles(agentManifests.ClusterImageSet.Spec.ReleaseImage, agentManifests.GetPullSecretData(), registriesConf.MirrorConfig)
if err != nil {
return err
}
}
err = a.prepareAgentArtifacts(a.ISOPath, agentTuiFiles)
if err != nil {
return err
}
return nil
}
func (a *AgentArtifacts) fetchAgentTuiFiles(releaseImage string, pullSecret string, mirrorConfig []mirror.RegistriesConfig) ([]string, error) {
release := NewRelease(
Config{MaxTries: OcDefaultTries, RetryDelay: OcDefaultRetryDelay},
releaseImage, pullSecret, mirrorConfig, nil)
agentTuiFilenames := []string{"/usr/bin/agent-tui", "/usr/lib64/libnmstate.so.*"}
files := []string{}
for _, srcFile := range agentTuiFilenames {
extracted, err := release.ExtractFile("agent-installer-utils", srcFile, a.CPUArch)
if err != nil {
return nil, err
}
for _, f := range extracted {
// Make sure it could be executed
err = os.Chmod(f, 0o555)
if err != nil {
return nil, err
}
files = append(files, f)
}
}
return files, nil
}
func (a *AgentArtifacts) prepareAgentArtifacts(iso string, additionalFiles []string) error {
// Create a tmp folder to store all the pieces required to generate the agent artifacts.
tmpPath, err := os.MkdirTemp("", "agent")
if err != nil {
return err
}
a.TmpPath = tmpPath
err = isoeditor.Extract(iso, a.TmpPath)
if err != nil {
return err
}
err = a.appendAgentFilesToInitrd(additionalFiles)
if err != nil {
return err
}
return nil
}
func (a *AgentArtifacts) appendAgentFilesToInitrd(additionalFiles []string) error {
ca := NewCpioArchive()
dstPath := "/agent-files/"
err := ca.StorePath(dstPath)
if err != nil {
return err
}
// Add the required agent files to the archive
for _, f := range additionalFiles {
err := ca.StoreFile(f, dstPath)
if err != nil {
return err
}
}
// Add a dracut hook to copy the files. The $NEWROOT environment variable is exported by
// dracut during the startup and it refers the mountpoint for the root filesystem.
dracutHookScript := `#!/bin/sh
cp -R /agent-files/* $NEWROOT/usr/local/bin/
# Fix the selinux label
for i in $(find /agent-files/ -printf "%P\n"); do chcon system_u:object_r:bin_t:s0 $NEWROOT/usr/local/bin/$i; done`
err = ca.StoreBytes("/usr/lib/dracut/hooks/pre-pivot/99-agent-copy-files.sh", []byte(dracutHookScript), 0o755)
if err != nil {
return err
}
buff, err := ca.SaveBuffer()
if err != nil {
return err
}
// Append the archive to initrd.img
initrdImgPath := filepath.Join(a.TmpPath, "images", "pxeboot", "initrd.img")
initrdImg, err := os.OpenFile(initrdImgPath, os.O_WRONLY|os.O_APPEND, 0)
if err != nil {
return err
}
defer initrdImg.Close()
_, err = initrdImg.Write(buff)
if err != nil {
return err
}
return nil
}
// Name returns the human-friendly name of the asset.
func (a *AgentArtifacts) Name() string {
return "Agent Installer Artifacts"
}
func createDir(bootArtifactsFullPath string) error {
os.RemoveAll(bootArtifactsFullPath)
err := os.Mkdir(bootArtifactsFullPath, 0750)
if err != nil {
return err
}
return nil
}
func extractRootFS(bootArtifactsFullPath, agentISOPath, arch string) error {
agentRootfsimgFile := filepath.Join(bootArtifactsFullPath, fmt.Sprintf("agent.%s-rootfs.img", arch))
rootfsReader, err := os.Open(filepath.Join(agentISOPath, "images", "pxeboot", "rootfs.img"))
if err != nil {
return err
}
defer rootfsReader.Close()
err = copyfile(agentRootfsimgFile, rootfsReader)
if err != nil {
return err
}
return nil
}