79 lines
1.5 KiB
Go
79 lines
1.5 KiB
Go
package plugin
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import (
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"github.com/mitchellh/packer/packer"
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packrpc "github.com/mitchellh/packer/packer/rpc"
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"log"
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"net/rpc"
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"os/exec"
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)
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type cmdBuilder struct {
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builder packer.Builder
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client *client
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}
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func (b *cmdBuilder) Prepare(config interface{}) error {
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defer func() {
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r := recover()
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b.checkExit(r, nil)
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}()
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return b.builder.Prepare(config)
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}
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func (b *cmdBuilder) Run(ui packer.Ui, hook packer.Hook) packer.Artifact {
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defer func() {
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r := recover()
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b.checkExit(r, nil)
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}()
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return b.builder.Run(ui, hook)
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}
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func (b *cmdBuilder) Cancel() {
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}
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func (c *cmdBuilder) checkExit(p interface{}, cb func()) {
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if c.client.Exited() && cb != nil {
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cb()
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} else if p != nil {
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log.Panic(p)
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}
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}
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// Returns a valid packer.Builder where the builder is executed via RPC
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// to a plugin that is within a subprocess.
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//
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// This method will start the given exec.Cmd, which should point to
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// the plugin binary to execute. Some configuration will be done to
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// the command, such as overriding Stdout and some environmental variables.
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//
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// This function guarantees the subprocess will end in a timely manner.
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func Builder(cmd *exec.Cmd) (result packer.Builder, err error) {
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cmdClient := NewManagedClient(cmd)
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address, err := cmdClient.Start()
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if err != nil {
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return
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}
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defer func() {
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// Make sure the command is properly killed in the case of an error
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if err != nil {
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cmdClient.Kill()
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}
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}()
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client, err := rpc.Dial("tcp", address)
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if err != nil {
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return
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}
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result = &cmdBuilder{
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packrpc.Builder(client),
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cmdClient,
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}
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return
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}
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