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oci2disk: fail fast if the given destinationDevice (via env DEST_DISK… #170

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oci2disk: fail fast if the given destinationDevice (via env DEST_DISK… #170

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5 changes: 5 additions & 0 deletions oci2disk/image/image.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,11 @@ func Write(sourceImage, destinationDevice string, compressed bool) error {

resolver := docker.NewResolver(opts)

// Check that the destination device exists before attempting to open it.
if _, err := os.Stat(destinationDevice); err != nil {
return fmt.Errorf("destination device %s does not exist", destinationDevice)
}

fileOut, err := os.OpenFile(destinationDevice, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return err
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