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// Copyright 2018-present the CoreDHCP Authors. All rights reserved
// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree.
package main
import (
"bufio"
"fmt"
"html/template"
"log"
"os"
"path"
"sort"
"strings"
flag "github.com/spf13/pflag"
)
const (
defaultTemplateFile = "coredhcp.go.template"
importBase = "github.com/coredhcp/coredhcp/"
)
var (
flagTemplate = flag.StringP("template", "t", defaultTemplateFile, "Template file name")
flagOutfile = flag.StringP("outfile", "o", "", "Output file path")
flagFromFile = flag.StringP("from", "f", "", "Optional file name to get the plugin list from, one import path per line")
)
var funcMap = template.FuncMap{
"importname": func(importPath string) (string, error) {
parts := strings.Split(importPath, "/")
if len(parts) < 1 {
return "", fmt.Errorf("no components found in import path '%s'", importPath)
}
return "pl_" + parts[len(parts)-1], nil
},
}
func usage() {
fmt.Fprintf(flag.CommandLine.Output(),
"%s [-template tpl] [-outfile out] [-from pluginlist] [plugin [plugin...]]\n",
os.Args[0],
)
flag.PrintDefaults()
fmt.Fprintln(flag.CommandLine.Output(), ` plugin
Plugin name to include, as go import path.
Short names can be used for builtin coredhcp plugins (eg "serverid")`)
}
func main() {
flag.Usage = usage
flag.Parse()
data, err := os.ReadFile(*flagTemplate)
if err != nil {
log.Fatalf("Failed to read template file '%s': %v", *flagTemplate, err)
}
t, err := template.New("coredhcp").Funcs(funcMap).Parse(string(data))
if err != nil {
log.Fatalf("Template parsing failed: %v", err)
}
plugins := make(map[string]bool)
for _, pl := range flag.Args() {
pl := strings.TrimSpace(pl)
if pl == "" {
continue
}
if !strings.ContainsRune(pl, '/') {
// A bare name was specified, not a full import path.
// Coredhcp plugins aren't in the standard library, and it's unlikely someone
// would put them at the base of $GOPATH/src.
// Assume this is one of the builtin plugins. If needed, use the -from option
// which always requires (and uses) exact paths
// XXX: we could also look into github.com/coredhcp/plugins
pl = importBase + pl
}
plugins[pl] = true
}
if *flagFromFile != "" {
// additional plugin names from a text file, one line per plugin import
// path
fd, err := os.Open(*flagFromFile)
if err != nil {
log.Fatalf("Failed to read file '%s': %v", *flagFromFile, err)
}
defer func() {
if err := fd.Close(); err != nil {
log.Printf("Error closing file '%s': %v", *flagFromFile, err)
}
}()
sc := bufio.NewScanner(fd)
for sc.Scan() {
pl := strings.TrimSpace(sc.Text())
if pl == "" {
continue
}
plugins[pl] = true
}
if err := sc.Err(); err != nil {
log.Fatalf("Error reading file '%s': %v", *flagFromFile, err)
}
}
if len(plugins) == 0 {
log.Fatalf("No plugin specified!")
}
outfile := *flagOutfile
if outfile == "" {
tmpdir, err := os.MkdirTemp("", "coredhcp")
if err != nil {
log.Fatalf("Cannot create temporary directory: %v", err)
}
outfile = path.Join(tmpdir, "coredhcp.go")
}
log.Printf("Generating output file '%s' with %d plugin(s):", outfile, len(plugins))
idx := 1
for pl := range plugins {
log.Printf("% 3d) %s", idx, pl)
idx++
}
outFD, err := os.OpenFile(outfile, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
log.Fatalf("Failed to create output file '%s': %v", outfile, err)
}
defer func() {
if err := outFD.Close(); err != nil {
log.Printf("Error while closing file descriptor for '%s': %v", outfile, err)
}
}()
// WARNING: no escaping of the provided strings is done
pluginList := make([]string, 0, len(plugins))
for pl := range plugins {
pluginList = append(pluginList, pl)
}
sort.Strings(pluginList)
if err := t.Execute(outFD, pluginList); err != nil {
log.Fatalf("Template execution failed: %v", err)
}
log.Printf("Generated file '%s'. You can build it by running 'go build' in the output directory.", outfile)
fmt.Println(path.Dir(outfile))
}
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