70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package configdrive
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import (
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"io/ioutil"
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"os"
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"path"
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)
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const (
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ec2ApiVersion = "2009-04-04"
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openstackApiVersion = "latest"
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)
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type configDrive struct {
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root string
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readFile func(filename string) ([]byte, error)
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}
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func NewDatasource(root string) *configDrive {
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return &configDrive{root, ioutil.ReadFile}
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}
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func (cd *configDrive) IsAvailable() bool {
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_, err := os.Stat(cd.root)
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return !os.IsNotExist(err)
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}
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func (cd *configDrive) AvailabilityChanges() bool {
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return true
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}
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func (cd *configDrive) ConfigRoot() string {
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return cd.openstackRoot()
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}
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// FetchMetadata attempts to retrieve metadata from ec2/2009-04-04/meta-data.json.
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func (cd *configDrive) FetchMetadata() ([]byte, error) {
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return cd.tryReadFile(path.Join(cd.ec2Root(), "meta-data.json"))
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}
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// FetchUserdata attempts to retrieve the userdata from ec2/2009-04-04/user-data.
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// If no data is found, it will attempt to read from openstack/latest/user_data.
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func (cd *configDrive) FetchUserdata() ([]byte, error) {
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bytes, err := cd.tryReadFile(path.Join(cd.ec2Root(), "user-data"))
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if bytes == nil && err == nil {
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bytes, err = cd.tryReadFile(path.Join(cd.openstackRoot(), "user_data"))
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}
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return bytes, err
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}
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func (cd *configDrive) Type() string {
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return "cloud-drive"
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}
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func (cd *configDrive) ec2Root() string {
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return path.Join(cd.root, "ec2", ec2ApiVersion)
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}
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func (cd *configDrive) openstackRoot() string {
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return path.Join(cd.root, "openstack", openstackApiVersion)
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}
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func (cd *configDrive) tryReadFile(filename string) ([]byte, error) {
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data, err := cd.readFile(filename)
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if os.IsNotExist(err) {
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err = nil
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}
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return data, err
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}
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