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| 1 | +// This Source Code Form is subject to the terms of the Mozilla Public |
| 2 | +// License, v. 2.0. If a copy of the MPL was not distributed with this |
| 3 | +// file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| 4 | + |
| 5 | +package qemu |
| 6 | + |
| 7 | +import ( |
| 8 | + "context" |
| 9 | + "encoding/json" |
| 10 | + "fmt" |
| 11 | + "io" |
| 12 | + "os" |
| 13 | + "os/exec" |
| 14 | + "strconv" |
| 15 | + "syscall" |
| 16 | + |
| 17 | + "github.com/hashicorp/go-multierror" |
| 18 | + |
| 19 | + "github.com/siderolabs/talos/pkg/provision" |
| 20 | + "github.com/siderolabs/talos/pkg/provision/providers/vm" |
| 21 | +) |
| 22 | + |
| 23 | +// Start restarts an existing cluster that was previously created but is now stopped. |
| 24 | +// This recreates the network bridge and restarts all helper services and VM nodes. |
| 25 | +func (p *provisioner) Start(ctx context.Context, cluster provision.Cluster, opts ...provision.Option) error { |
| 26 | + options := provision.DefaultOptions() |
| 27 | + |
| 28 | + for _, opt := range opts { |
| 29 | + if err := opt(&options); err != nil { |
| 30 | + return err |
| 31 | + } |
| 32 | + } |
| 33 | + |
| 34 | + state, ok := cluster.(*provision.State) |
| 35 | + if !ok { |
| 36 | + return fmt.Errorf("cluster is not a *provision.State") |
| 37 | + } |
| 38 | + |
| 39 | + fmt.Fprintln(options.LogWriter, "recreating network bridge", state.BridgeName) |
| 40 | + |
| 41 | + if err := p.RecreateNetwork(ctx, state, options); err != nil { |
| 42 | + return fmt.Errorf("error recreating network: %w", err) |
| 43 | + } |
| 44 | + |
| 45 | + fmt.Fprintln(options.LogWriter, "starting load balancer") |
| 46 | + |
| 47 | + if err := p.StartLoadBalancer(state); err != nil { |
| 48 | + return fmt.Errorf("error starting loadbalancer: %w", err) |
| 49 | + } |
| 50 | + |
| 51 | + fmt.Fprintln(options.LogWriter, "starting dnsd") |
| 52 | + |
| 53 | + if err := p.StartDNSd(state); err != nil { |
| 54 | + return fmt.Errorf("error starting dnsd: %w", err) |
| 55 | + } |
| 56 | + |
| 57 | + fmt.Fprintln(options.LogWriter, "starting nodes") |
| 58 | + |
| 59 | + if err := p.startNodes(ctx, state, &options); err != nil { |
| 60 | + return err |
| 61 | + } |
| 62 | + |
| 63 | + fmt.Fprintln(options.LogWriter, "starting dhcpd") |
| 64 | + |
| 65 | + if err := p.StartDHCPd(state); err != nil { |
| 66 | + return fmt.Errorf("error starting dhcpd: %w", err) |
| 67 | + } |
| 68 | + |
| 69 | + return nil |
| 70 | +} |
| 71 | + |
| 72 | +// startNodes starts all nodes from saved state. |
| 73 | +func (p *provisioner) startNodes(ctx context.Context, state *provision.State, options *provision.Options) error { |
| 74 | + errCh := make(chan error) |
| 75 | + nodes := state.ClusterInfo.Nodes |
| 76 | + |
| 77 | + for _, node := range nodes { |
| 78 | + go func(node provision.NodeInfo) { |
| 79 | + errCh <- p.startNode(ctx, state, node, options) |
| 80 | + }(node) |
| 81 | + } |
| 82 | + |
| 83 | + var multiErr *multierror.Error |
| 84 | + |
| 85 | + for range nodes { |
| 86 | + multiErr = multierror.Append(multiErr, <-errCh) |
| 87 | + } |
| 88 | + |
| 89 | + return multiErr.ErrorOrNil() |
| 90 | +} |
| 91 | + |
| 92 | +// startNode starts a single node from saved state. |
| 93 | +func (p *provisioner) startNode(_ context.Context, state *provision.State, node provision.NodeInfo, options *provision.Options) error { |
| 94 | + pidPath := state.GetRelativePath(fmt.Sprintf("%s.pid", node.Name)) |
| 95 | + |
| 96 | + // Check if already running |
| 97 | + if vm.IsProcessRunning(pidPath) { |
| 98 | + fmt.Fprintf(options.LogWriter, "node %s already running\n", node.Name) |
| 99 | + |
| 100 | + return nil |
| 101 | + } |
| 102 | + |
| 103 | + // Read the saved launch config |
| 104 | + configPath := state.GetRelativePath(fmt.Sprintf("%s.config", node.Name)) |
| 105 | + |
| 106 | + configFile, err := os.Open(configPath) |
| 107 | + if err != nil { |
| 108 | + return fmt.Errorf("error opening config file for %s: %w", node.Name, err) |
| 109 | + } |
| 110 | + |
| 111 | + defer configFile.Close() //nolint:errcheck |
| 112 | + |
| 113 | + // Verify the config is valid JSON |
| 114 | + var launchConfig LaunchConfig |
| 115 | + if err := json.NewDecoder(configFile).Decode(&launchConfig); err != nil { |
| 116 | + return fmt.Errorf("error decoding config file for %s: %w", node.Name, err) |
| 117 | + } |
| 118 | + |
| 119 | + // Seek back to beginning for stdin |
| 120 | + if _, err := configFile.Seek(0, io.SeekStart); err != nil { |
| 121 | + return fmt.Errorf("error seeking config file for %s: %w", node.Name, err) |
| 122 | + } |
| 123 | + |
| 124 | + logFile, err := os.OpenFile(state.GetRelativePath(fmt.Sprintf("%s.log", node.Name)), os.O_APPEND|os.O_CREATE|os.O_RDWR, 0o666) |
| 125 | + if err != nil { |
| 126 | + return fmt.Errorf("error opening log file for %s: %w", node.Name, err) |
| 127 | + } |
| 128 | + |
| 129 | + defer logFile.Close() //nolint:errcheck |
| 130 | + |
| 131 | + fmt.Fprintf(options.LogWriter, "starting node %s\n", node.Name) |
| 132 | + |
| 133 | + cmd := exec.Command(state.SelfExecutable, "qemu-launch") //nolint:noctx // runs in background |
| 134 | + cmd.Stdout = logFile |
| 135 | + cmd.Stderr = logFile |
| 136 | + cmd.Stdin = configFile |
| 137 | + cmd.SysProcAttr = &syscall.SysProcAttr{ |
| 138 | + Setsid: true, // daemonize |
| 139 | + } |
| 140 | + |
| 141 | + if err = cmd.Start(); err != nil { |
| 142 | + return fmt.Errorf("error starting node %s: %w", node.Name, err) |
| 143 | + } |
| 144 | + |
| 145 | + if err = os.WriteFile(pidPath, []byte(strconv.Itoa(cmd.Process.Pid)), os.ModePerm); err != nil { |
| 146 | + return fmt.Errorf("error writing PID file for %s: %w", node.Name, err) |
| 147 | + } |
| 148 | + |
| 149 | + return nil |
| 150 | +} |
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