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opening file with twi seperate descriptors

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This commit is contained in:
Christian Goll
2022-10-27 11:41:03 +02:00
parent 21f7a1f8c3
commit 721a52239f
1 changed files with 13 additions and 6 deletions
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19
internal/app/wwctl/overlay/edit/main.go
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@@ -76,26 +76,33 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
# Source: {{.BuildSource}}
`
fmt.Fprint(w, fmtStr)
w.Close()
}
fileDesc, err := os.OpenFile(overlayFile, os.O_RDWR, os.FileMode(PermMode))
fileDesc1, err := os.OpenFile(overlayFile, os.O_RDWR, os.FileMode(PermMode))
if err != nil {
wwlog.Warn("Could not open file for editing: %s", err)
}
defer fileDesc.Close()
_, _ = fileDesc.Seek(0, 0)
defer fileDesc1.Close()
_, _ = fileDesc1.Seek(0, 0)
hasher := sha256.New()
if _, err := io.Copy(hasher, fileDesc); err != nil {
if _, err := io.Copy(hasher, fileDesc1); err != nil {
wwlog.Error("Problems getting checksum of file %s\n", err)
}
sum1 := hex.EncodeToString(hasher.Sum(nil))
fileDesc1.Close()
err = util.ExecInteractive(editor, overlayFile)
if err != nil {
wwlog.Error("Editor process existed with non-zero")
os.Exit(1)
}
_, _ = fileDesc.Seek(0, 0)
fileDesc2, err := os.OpenFile(overlayFile, os.O_RDWR, os.FileMode(PermMode))
if err != nil {
wwlog.Warn("Could not open file for editing: %s", err)
}
defer fileDesc2.Close()
_, _ = fileDesc2.Seek(0, 0)
hasher.Reset()
if _, err := io.Copy(hasher, fileDesc); err != nil {
if _, err := io.Copy(hasher, fileDesc2); err != nil {
wwlog.Error("Problems getting checksum of file %s\n", err)
}
sum2 := hex.EncodeToString(hasher.Sum(nil))