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package layer // import "github.com/docker/docker/layer"
import (
"fmt"
"os"
"strings"
)
// setOS writes the "os" file to the layer filestore
func (fm *fileMetadataTransaction) setOS(os string) error {
if os == "" {
return nil
}
return fm.ws.WriteFile("os", []byte(os), 0644)
}
// getOS reads the "os" file from the layer filestore
func (fms *fileMetadataStore) getOS(layer ChainID) (string, error) {
contentBytes, err := os.ReadFile(fms.getLayerFilename(layer, "os"))
if err != nil {
// For backwards compatibility, the os file may not exist. Default to "windows" if missing.
if os.IsNotExist(err) {
return "windows", nil
}
return "", err
}
content := strings.TrimSpace(string(contentBytes))
if content != "windows" && content != "linux" {
return "", fmt.Errorf("invalid operating system value: %s", content)
}
return content, nil
}
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