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plugin.go
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plugin.go
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// Copyright 2018 Schibsted
package buildbuild
import (
"errors"
"fmt"
"os"
"os/exec"
"path"
"syscall"
)
type Plugin interface {
Startup(ops *GlobalOps) error
}
var LoadedPlugins = map[string]Plugin{}
var (
// Descriptor defaults defined by plugins.
PluginDescriptors = map[string]Descriptor{}
// Params added by plugins that are allowed in all descriptors.
PluginGeneralParams = map[string]ParseGeneralParam{}
PluginLinkerParams = map[string]ParseLinkerParam{}
// File extensions added by plugins.
PluginGeneralExtensions = map[string]CompileGeneralSrcFunc{}
PluginLinkerExtensions = map[string]CompileLinkerSrcFunc{}
// Specialsrcs rules that plugin will process.
PluginSpecialSrcs = map[string]CompileSpecialSrcFunc{}
)
var (
NoSuchPlugin = errors.New("Plugin doesn't exist in binary")
ErrNeedReExec = errors.New("need to re-execute binary")
)
func InitPlugin(pkg string, plug Plugin) {
if LoadedPlugins[pkg] != nil {
panic(`Duplicate plugin "` + pkg + `"`)
}
LoadedPlugins[pkg] = plug
}
func (ops *GlobalOps) LoadPlugin(bd, ppath string) (Plugin, error) {
pkg := path.Base(ppath)
if plug := LoadedPlugins[pkg]; plug != nil {
return plug, nil
}
if ops.BuildPlugin != nil {
err := ops.BuildPlugin(ops, ppath)
if err != nil {
if err == ErrNeedReExec {
ops.ReExec()
}
return nil, &ParseError{err, bd, ppath}
}
if plug := LoadedPlugins[pkg]; plug != nil {
return plug, nil
}
}
return nil, &ParseError{NoSuchPlugin, ppath, bd}
}
func (ops *GlobalOps) ReExec() {
bin, err := exec.LookPath(os.Args[0])
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to re-exec %q", os.Args[0])
return
}
if err := syscall.Exec(bin, os.Args, syscall.Environ()); err != nil {
panic(err)
}
}
func (ops *GlobalOps) StartPlugin(bd, ppath string) error {
plug, err := ops.LoadPlugin(bd, ppath)
if err != nil {
return err
}
return plug.Startup(ops)
}