forked from openfaas/faas-cli
/
fetch_templates.go
118 lines (97 loc) · 3.39 KB
/
fetch_templates.go
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// Copyright (c) Alex Ellis 2017. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
package commands
import (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"github.com/openfaas/faas-cli/builder"
"github.com/openfaas/faas-cli/versioncontrol"
)
// DefaultTemplateRepository contains the Git repo for the official templates
const DefaultTemplateRepository = "https://github.com/openfaas/templates.git"
const templateDirectory = "./template/"
// fetchTemplates fetch code templates from GitHub master zip file.
func fetchTemplates(templateURL string, overwrite bool) error {
if len(templateURL) == 0 {
return fmt.Errorf("pass valid templateURL")
}
dir, err := ioutil.TempDir("", "openFaasTemplates")
if err != nil {
log.Fatal(err)
}
if !pullDebug {
defer os.RemoveAll(dir) // clean up
}
log.Printf("Attempting to expand templates from %s\n", templateURL)
pullDebugPrint(fmt.Sprintf("Temp files in %s", dir))
args := map[string]string{"dir": dir, "repo": templateURL}
if err := versioncontrol.GitClone.Invoke(".", args); err != nil {
return err
}
preExistingLanguages, fetchedLanguages, err := moveTemplates(dir, overwrite)
if err != nil {
return err
}
if len(preExistingLanguages) > 0 {
log.Printf("Cannot overwrite the following %d template(s): %v\n", len(preExistingLanguages), preExistingLanguages)
}
log.Printf("Fetched %d template(s) : %v from %s\n", len(fetchedLanguages), fetchedLanguages, templateURL)
return err
}
// canWriteLanguage tells whether the language can be expanded from the zip or not.
// availableLanguages map keeps track of which languages we know to be okay to copy.
// overwrite flag will allow to force copy the language template
func canWriteLanguage(availableLanguages map[string]bool, language string, overwrite bool) bool {
canWrite := false
if availableLanguages != nil && len(language) > 0 {
if _, found := availableLanguages[language]; found {
return availableLanguages[language]
}
canWrite = templateFolderExists(language, overwrite)
availableLanguages[language] = canWrite
}
return canWrite
}
// Takes a language input (e.g. "node"), tells whether or not it is OK to download
func templateFolderExists(language string, overwrite bool) bool {
dir := templateDirectory + language
if _, err := os.Stat(dir); err == nil && !overwrite {
// The directory template/language/ exists
return false
}
return true
}
func moveTemplates(repoPath string, overwrite bool) ([]string, []string, error) {
var (
existingLanguages []string
fetchedLanguages []string
err error
)
availableLanguages := make(map[string]bool)
templateDir := filepath.Join(repoPath, templateDirectory)
templates, err := ioutil.ReadDir(templateDir)
if err != nil {
return nil, nil, fmt.Errorf("can't find templates in: %s", repoPath)
}
for _, file := range templates {
if !file.IsDir() {
continue
}
language := file.Name()
canWrite := canWriteLanguage(availableLanguages, language, overwrite)
if canWrite {
fetchedLanguages = append(fetchedLanguages, language)
// Do cp here
languageSrc := filepath.Join(templateDir, language)
languageDest := filepath.Join(templateDirectory, language)
builder.CopyFiles(languageSrc, languageDest)
} else {
existingLanguages = append(existingLanguages, language)
continue
}
}
return existingLanguages, fetchedLanguages, nil
}