Merge pull request #902 from anderbubble/overlay-edit
Update overlay edit with tempfile and mtime
This commit is contained in:
Christian Goll
GitHub
@@ -1,13 +1,11 @@
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package edit
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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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/hpcng/warewulf/internal/pkg/overlay"
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"github.com/hpcng/warewulf/internal/pkg/util"
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@@ -15,103 +13,128 @@ import (
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"github.com/spf13/cobra"
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)
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func CobraRunE(cmd *cobra.Command, args []string) error {
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editor := os.Getenv("EDITOR")
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var overlaySourceDir string
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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/development/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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if editor == "" {
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editor = "/bin/vi"
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}
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overlaySourceDir = overlay.OverlaySourceDir(overlayName)
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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(path.Dir(overlayFile), 0755)
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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", path.Dir(overlayFile))
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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(path.Dir(overlayFile)) {
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wwlog.Error("Can not create file, parent directory does not exist, try adding the")
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wwlog.Error("'--parents' option to create the directory.")
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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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newFile := false
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if !util.IsFile(overlayFile) && filepath.Ext(overlayFile) == ".ww" {
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wwlog.Verbose("This is a new file, creating some default content")
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newFile = true
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w, err := os.OpenFile(overlayFile, os.O_RDWR|os.O_CREATE, os.FileMode(PermMode))
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if err != nil {
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wwlog.Warn("Could not create file for writing: %s", err)
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}
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fmtStr := `# 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}}\n")
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# Node Cluster = {{.ClusterName}}\n")
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# Network Config = {{.NetDevs.eth0.Ipaddr}}, {{.NetDevs.eth0.Hwaddr}}, etc.
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#
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# Goto the documentation pages for more information: http://www.hpcng.org/...
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# Keep the following for better reference
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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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fmt.Fprint(w, fmtStr)
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w.Close()
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}
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fileDesc1, err := os.OpenFile(overlayFile, os.O_RDWR, os.FileMode(PermMode))
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if err != nil {
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wwlog.Verbose("Files doesn't exist or can't be created: %s", err)
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}
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defer fileDesc1.Close()
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_, _ = fileDesc1.Seek(0, 0)
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hasher := sha256.New()
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if _, err := io.Copy(hasher, fileDesc1); err != nil {
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wwlog.Verbose("Problems getting checksum of file %s\n", err)
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}
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sum1 := hex.EncodeToString(hasher.Sum(nil))
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fileDesc1.Close()
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err = util.ExecInteractive(editor, overlayFile)
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if err != nil {
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wwlog.Error("Editor process existed with non-zero")
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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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fileDesc2, err := os.OpenFile(overlayFile, os.O_RDWR, os.FileMode(PermMode))
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if err != nil {
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wwlog.Warn("Could not open file for editing: %s", err)
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}
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defer fileDesc2.Close()
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_, _ = fileDesc2.Seek(0, 0)
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hasher.Reset()
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if _, err := io.Copy(hasher, fileDesc2); err != nil {
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wwlog.Error("Problems getting checksum of file %s\n", err)
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}
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sum2 := hex.EncodeToString(hasher.Sum(nil))
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if sum1 == sum2 && newFile {
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wwlog.Verbose("New template %s wasn't modified, deleting it", overlayFile)
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err = os.Remove(overlayFile)
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if err != nil {
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wwlog.Warn("Could not delete %s", overlayFile)
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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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tempFileReader, tempFileErr := os.Open(tempFile.Name())
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if tempFileErr != nil {
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wwlog.Error("Unable to open %s: %s", tempFile.Name(), tempFileErr)
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os.Exit(1)
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}
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defer tempFileReader.Close()
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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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destination, destinationErr := os.OpenFile(overlayFile, os.O_RDWR|os.O_CREATE, os.FileMode(PermMode))
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if destinationErr != nil {
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wwlog.Error("Unable to update %s: %s", overlayFile, destinationErr)
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os.Exit(1)
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}
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defer destination.Close()
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wwlog.Debug("Copy %s to %s", tempFileReader.Name(), destination.Name())
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if _, copyErr := io.Copy(destination, tempFileReader); copyErr != nil {
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wwlog.Error("Unable to update %s: %s", destination.Name(), copyErr)
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os.Exit(1)
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}
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return nil
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