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Improve atomicity of VM state persistence on Windows

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Signed-off-by: Jason T. Greene <jason.greene@redhat.com>
This commit is contained in:
Jason T. Greene
2022-11-29 12:34:46 -06:00
parent e15ffc1a76
commit 009f5ec672
1 changed files with 20 additions and 5 deletions
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25
pkg/machine/wsl/machine.go
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@ -267,11 +267,16 @@ func (p *Provider) NewMachine(opts machine.InitOptions) (machine.VM, error) {
}
func getConfigPath(name string) (string, error) {
return getConfigPathExt(name, "json")
}
func getConfigPathExt(name string, extension string) (string, error) {
vmConfigDir, err := machine.GetConfDir(vmtype)
if err != nil {
return "", err
}
return filepath.Join(vmConfigDir, name+".json"), nil
return filepath.Join(vmConfigDir, fmt.Sprintf("%s.%s", name, extension)), nil
}
// LoadByName reads a json file that describes a known qemu vm
@ -424,14 +429,24 @@ func downloadDistro(v *MachineVM, opts machine.InitOptions) error {
}
func (v *MachineVM) writeConfig() error {
const format = "could not write machine json config: %w"
jsonFile := v.ConfigPath
b, err := json.MarshalIndent(v, "", " ")
tmpFile, err := getConfigPathExt(v.Name, "tmp")
if err != nil {
return err
}
if err := os.WriteFile(jsonFile, b, 0644); err != nil {
return fmt.Errorf("could not write machine json config: %w", err)
b, err := json.MarshalIndent(v, "", " ")
if err != nil {
return fmt.Errorf(format, err)
}
if err := os.WriteFile(tmpFile, b, 0644); err != nil {
return fmt.Errorf(format, err)
}
if err := os.Rename(tmpFile, jsonFile); err != nil {
return fmt.Errorf(format, err)
}
return nil