133 lines
3.8 KiB
Go
133 lines
3.8 KiB
Go
package edit
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import (
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"io"
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"os"
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"path"
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"path/filepath"
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"time"
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"github.com/spf13/cobra"
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"github.com/warewulf/warewulf/internal/pkg/overlay"
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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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const initialTemplate = `# This is a Warewulf Template file.
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#
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# This file (suffix '.ww') will be automatically rewritten without the suffix
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# when the overlay is rendered for the individual nodes. Here are some examples
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# of macros and logic which can be used within this file:
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#
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# Node FQDN = {{.Id}}
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# Node Cluster = {{.ClusterName}}
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# Network Config = {{.NetDevs.eth0.Ipaddr}}, {{.NetDevs.eth0.Hwaddr}}, etc.
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#
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# Go to the documentation pages for more information:
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# https://warewulf.org/docs/main/contents/overlays.html
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#
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# Keep the following for better reference:
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# ---
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# This file is autogenerated by warewulf
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# Host: {{.BuildHost}}
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# Time: {{.BuildTime}}
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# Source: {{.BuildSource}}
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`
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func CobraRunE(cmd *cobra.Command, args []string) error {
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overlayName := args[0]
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fileName := args[1]
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overlaySourceDir := overlay.OverlaySourceDir(overlayName)
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if !util.IsDir(overlaySourceDir) {
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wwlog.Error("Overlay does not exist: %s", overlayName)
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os.Exit(1)
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}
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overlayFile := path.Join(overlaySourceDir, fileName)
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wwlog.Debug("Will edit overlay file: %s", overlayFile)
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overlayFileDir := path.Dir(overlayFile)
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if CreateDirs {
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err := os.MkdirAll(overlayFileDir, 0755)
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if err != nil {
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wwlog.Error("Could not create directory: %s", overlayFileDir)
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os.Exit(1)
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}
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} else {
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if !util.IsDir(overlayFileDir) {
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wwlog.Error("%s does not exist. Use '--parents' option to create automatically.", overlayFileDir)
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os.Exit(1)
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}
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}
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tempFile, tempFileErr := os.CreateTemp("", "ww-overlay-edit-")
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if tempFileErr != nil {
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wwlog.Error("Unable to create temporary file for editing: %s", tempFileErr)
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os.Exit(1)
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}
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defer os.Remove(tempFile.Name())
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wwlog.Debug("Using temporary file %s", tempFile.Name())
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if util.IsFile(overlayFile) {
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originalFile, openErr := os.Open(overlayFile)
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if openErr != nil {
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wwlog.Error("Unable to open %s: %s", overlayFile, openErr)
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os.Exit(1)
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}
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if _, err := io.Copy(tempFile, originalFile); err != nil {
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wwlog.Error("Unable to copy %s to %s for editing: %s", originalFile.Name(), tempFile.Name(), err)
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os.Exit(1)
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}
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originalFile.Close()
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} else if filepath.Ext(overlayFile) == ".ww" {
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if _, err := tempFile.Write([]byte(initialTemplate)); err != nil {
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wwlog.Error("Unable to write to %s: %s", tempFile.Name(), err)
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os.Exit(1)
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}
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}
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tempFile.Close()
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var startTime time.Time
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if fileInfo, err := os.Stat(tempFile.Name()); err != nil {
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wwlog.Error("Unable to stat %s: %s", tempFile.Name(), err)
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os.Exit(1)
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} else {
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startTime = fileInfo.ModTime()
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}
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editor := os.Getenv("EDITOR")
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if editor == "" {
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editor = "/bin/vi"
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}
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if editorErr := util.ExecInteractive(editor, tempFile.Name()); editorErr != nil {
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wwlog.Error("Editor process exited with an error: %s", editorErr)
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os.Exit(1)
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}
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if fileInfo, err := os.Stat(tempFile.Name()); err != nil {
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wwlog.Error("Unable to stat %s: %s", tempFile.Name(), err)
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os.Exit(1)
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} else {
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if startTime == fileInfo.ModTime() {
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wwlog.Debug("No change detected. Not updating overlay.")
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os.Exit(0)
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}
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}
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// try renaming the tempfile to overlayfile first
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err := os.Rename(tempFile.Name(), overlayFile)
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if err != nil {
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// if it fails, which probably means that they exists on different partitions
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// fallback to data copy
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wwlog.Debug("Unable to rename temp file: %s to overlay file: %s, try copying the data", tempFile.Name(), overlayFile)
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cerr := util.CopyFile(tempFile.Name(), overlayFile)
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if cerr != nil {
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wwlog.Error("Unable to copy data from temp file: %s to target file: %s, err: %s", tempFile.Name(), overlayFile, err)
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return cerr
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}
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}
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return nil
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}
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