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8ca4d49347
This fixes a long standing issue with upgrading the init node. We currently have no way of knowing whether the init node should join an existing etcd cluster, or create a new one. This makes use of the node's metadata to determine if the node has already created the etcd cluster. Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>
75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package metadata
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import (
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"errors"
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"io/ioutil"
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"path/filepath"
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"time"
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"github.com/talos-systems/talos/internal/pkg/runtime"
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"github.com/talos-systems/talos/pkg/constants"
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"gopkg.in/yaml.v2"
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)
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// Metadata represents the node metadata.
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type Metadata struct {
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Timestamp time.Time `yaml:"timestamp"`
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Upgraded bool `yaml:"upgraded"`
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}
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// NewMetadata initializes and returns the metadata.
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func NewMetadata(sequence runtime.Sequence) *Metadata {
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upgraded := sequence == runtime.Upgrade
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return &Metadata{
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Timestamp: time.Now(),
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Upgraded: upgraded,
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}
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}
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// Open attempts to read the metadata.
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func Open() (m *Metadata, err error) {
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m = &Metadata{}
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b, err := ioutil.ReadFile(m.Path())
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if err != nil {
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return nil, err
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}
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if len(b) == 0 {
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return nil, errors.New("metadata file is empty")
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}
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if err = yaml.Unmarshal(b, m); err != nil {
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return nil, err
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}
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return m, nil
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}
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// Save attempts to save the metadata.
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func (m *Metadata) Save() (err error) {
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var b []byte
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if b, err = m.Bytes(); err != nil {
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return err
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}
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return ioutil.WriteFile(m.Path(), b, 0400)
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}
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// Bytes returns to byte slice representation of the metadata.
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func (m *Metadata) Bytes() ([]byte, error) {
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return yaml.Marshal(m)
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}
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// Path returns the path to the metadata.
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func (m *Metadata) Path() string {
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return filepath.Join(constants.BootMountPoint, constants.MetadataFile)
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}
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