243 lines
7.0 KiB
Go
243 lines
7.0 KiB
Go
//go:build linux
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// +build linux
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package exec
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import (
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"fmt"
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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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"time"
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warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
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"github.com/spf13/cobra"
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"github.com/warewulf/warewulf/internal/pkg/image"
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"github.com/warewulf/warewulf/internal/pkg/util"
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"github.com/warewulf/warewulf/internal/pkg/wwlog"
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)
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func runChildCmd(cmd *cobra.Command, args []string) error {
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child := exec.Command("/proc/self/exe", args...)
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child.SysProcAttr = &syscall.SysProcAttr{
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Cloneflags: syscall.CLONE_NEWUTS | syscall.CLONE_NEWPID | syscall.CLONE_NEWNS,
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}
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child.Stdin = cmd.InOrStdin()
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child.Stdout = cmd.OutOrStdout()
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child.Stderr = cmd.ErrOrStderr()
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return child.Run()
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}
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var childCommandFunc = runChildCmd
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// Fork a child process with a new PID space
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func runContainedCmd(cmd *cobra.Command, imageName string, args []string) (err error) {
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wwlog.Debug("runContainedCmd:args: %v", args)
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conf := warewulfconf.Get()
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runDir := image.RunDir(imageName)
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if err := os.Mkdir(runDir, 0750); err != nil {
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if _, existerr := os.Stat(runDir); !os.IsNotExist(existerr) {
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return fmt.Errorf("run directory already exists: another image command may already be running (otherwise, remove %s)", runDir)
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} else {
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return fmt.Errorf("unable to create run directory: %w", err)
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}
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}
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defer func() {
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if err := os.RemoveAll(runDir); err != nil {
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wwlog.Error("error removing run directory: %s", err)
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}
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}()
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logStr := fmt.Sprint(wwlog.GetLogLevel())
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childArgs := []string{"--warewulfconf", conf.GetWarewulfConf(), "--loglevel", logStr, "image", "exec", "__child"}
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childArgs = append(childArgs, imageName)
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for _, b := range binds {
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childArgs = append(childArgs, "--bind", b)
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}
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if nodeName != "" {
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childArgs = append(childArgs, "--node", nodeName)
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}
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childArgs = append(childArgs, "--")
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childArgs = append(childArgs, args...)
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// copy the files into the image at this stage, es in __child the
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// command syscall.Exec which replaces the __child process with the
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// exec command in the image. All the mounts, have to be done in
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// __child so that the used mounts don't propagate outside on the host
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// (see the CLONE attributes), but as for the copy option we need
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// to see if a file was modified after it was copied into the image
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// so do this here.
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// At first read out conf, the parse commandline, as copy files has the
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// same synatx as mount points
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mountPts := append(image.InitMountPnts(binds), conf.MountsImage...)
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filesToCpy := getCopyFiles(mountPts)
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for _, cpyFile := range filesToCpy {
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if err := (cpyFile).copyToImage(imageName); err != nil {
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wwlog.Warn("couldn't copy file: %s", err)
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}
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}
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wwlog.Verbose("Running contained command: %s", childArgs)
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retVal := childCommandFunc(cmd, childArgs)
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for _, cpyFile := range filesToCpy {
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if cpyFile.shouldRemoveFromImage(imageName) {
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if err := cpyFile.removeFromImage(imageName); err != nil {
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wwlog.Warn("couldn't remove file: %s", err)
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}
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}
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}
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return retVal
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}
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func CobraRunE(cmd *cobra.Command, args []string) error {
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wwlog.Debug("CobraRunE:args: %v", args)
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imageName := args[0]
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wwlog.Debug("CobraRunE:imageName: %v", imageName)
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if !image.ValidSource(imageName) {
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return fmt.Errorf("unknown Warewulf image: %s", imageName)
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}
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_ = os.Setenv("WW_CONTAINER_SHELL", imageName)
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_ = os.Setenv("WW_IMAGE_SHELL", imageName)
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imagePath := image.RootFsDir(imageName)
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beforePasswdTime := getTime(path.Join(imagePath, "/etc/passwd"))
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wwlog.Debug("passwdTime: %v", beforePasswdTime)
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beforeGroupTime := getTime(path.Join(imagePath, "/etc/group"))
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wwlog.Debug("groupTime: %v", beforeGroupTime)
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err := runContainedCmd(cmd, imageName, args[1:])
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if err != nil {
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return fmt.Errorf("command returned an error: %v: %s", args[1:], err)
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}
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for _, exitScript := range []string{"/etc/warewulf/image_exit.sh", "/etc/warewulf/container_exit.sh"} {
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if util.IsFile(path.Join(imagePath, exitScript)) {
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wwlog.Verbose("Found exit script: %s", exitScript)
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err = runContainedCmd(cmd, imageName, []string{"/bin/sh", exitScript})
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if err != nil {
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return fmt.Errorf("exit script returned an error: %v: %s", exitScript, err)
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}
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break
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}
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}
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userdbChanged := false
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if !beforePasswdTime.IsZero() {
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afterPasswdTime := getTime(path.Join(imagePath, "/etc/passwd"))
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wwlog.Debug("passwdTime: %v", afterPasswdTime)
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if beforePasswdTime.Before(afterPasswdTime) {
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userdbChanged = true
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}
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}
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if !beforeGroupTime.IsZero() {
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afterGroupTime := getTime(path.Join(imagePath, "/etc/group"))
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wwlog.Debug("groupTime: %v", afterGroupTime)
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if beforeGroupTime.Before(afterGroupTime) {
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userdbChanged = true
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}
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}
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if SyncUser {
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if userdbChanged {
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if err = image.Syncuser(imageName, false); err != nil {
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wwlog.Error("syncuser error: %s", err)
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}
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} else {
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wwlog.Info("Skipping syncuser (passwd and group files not changed)")
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}
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}
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if Build {
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err = image.Build(imageName, false)
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if err != nil {
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return fmt.Errorf("could not build image: %s: %s", imageName, err)
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}
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}
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return nil
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}
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func getTime(path string) time.Time {
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if fileStat, err := os.Stat(path); err != nil {
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return time.Time{}
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} else {
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unixStat := fileStat.Sys().(*syscall.Stat_t)
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return time.Unix(int64(unixStat.Mtim.Sec), int64(unixStat.Mtim.Nsec))
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}
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}
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func SetBinds(myBinds []string) {
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binds = append(binds, myBinds...)
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}
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func SetNode(myNode string) {
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nodeName = myNode
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}
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// file name and last modification time so we can remove the file if it wasn't modified
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type copyFile struct {
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fileName string
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src string
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modTime time.Time
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}
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func (cf *copyFile) imageDest(imageName string) string {
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return path.Join(image.RootFsDir(imageName), cf.fileName)
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}
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func (cf *copyFile) copyToImage(imageName string) error {
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imageDest := cf.imageDest(imageName)
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if _, err := os.Stat(path.Dir(imageDest)); err != nil {
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return err
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} else if _, err := os.Stat(imageDest); err == nil {
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return err
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} else if _, err := os.Stat(cf.src); err != nil {
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return err
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} else if err := util.CopyFile(cf.src, imageDest); err != nil {
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return err
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} else if stat, err := os.Stat(imageDest); err != nil {
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return err
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} else {
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cf.modTime = stat.ModTime()
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return nil
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}
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}
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func (cf *copyFile) shouldRemoveFromImage(imageName string) bool {
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imageDest := cf.imageDest(imageName)
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if cf.modTime.IsZero() {
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wwlog.Debug("file was not previously copied: %s", cf.fileName)
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return false
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} else if destStat, err := os.Stat(imageDest); err != nil {
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wwlog.Verbose("file is no longer present: %s (%s)", cf.fileName, err)
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return false
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} else if destStat.ModTime().Equal(cf.modTime) {
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wwlog.Verbose("don't remove modified file:", cf.fileName)
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return false
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} else {
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return true
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}
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}
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func (cf *copyFile) removeFromImage(imageName string) error {
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imageDest := cf.imageDest(imageName)
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return os.Remove(imageDest)
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}
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/*
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Check the objects we want to copy in, instead of mounting
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*/
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func getCopyFiles(binds []*warewulfconf.MountEntry) (copyObjects []*copyFile) {
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for _, bind := range binds {
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if bind.Copy() {
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copyObjects = append(copyObjects, ©File{
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fileName: bind.Dest,
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src: bind.Source,
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})
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}
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}
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return
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}
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