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package linguist
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"gitlab.com/gitlab-org/gitaly/internal/command"
"gitlab.com/gitlab-org/gitaly/internal/config"
)
func init() {
config.RegisterHook(LoadColors)
}
var exportedEnvVars = []string{"HOME", "PATH", "GEM_HOME", "BUNDLE_PATH", "BUNDLE_APP_CONFIG"}
var (
colorMap = make(map[string]Language)
)
// Language is used to parse Linguist's language.json file.
type Language struct {
Color string `json:"color"`
}
// CountPerLanguage represents a counter value (int) per language.
type CountPerLanguage map[string]int
// ByteCountPerLanguage represents a counter value (bytes) per language.
type ByteCountPerLanguage map[string]uint64
// FileListPerLanguage is used to parse Linguist's breakdown output to represent the list of files per language.
type FileListPerLanguage map[string][]string
// Stats returns the repository's language stats as reported by 'git-linguist'.
func Stats(ctx context.Context, repoPath string, commitID string) (ByteCountPerLanguage, error) {
reader, err := startGitLinguist(ctx, repoPath, commitID, "stats")
if err != nil {
return nil, err
}
data, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
stats := make(ByteCountPerLanguage)
return stats, json.Unmarshal(data, &stats)
}
// FileCountStats returns the file counts per language
func FileCountStats(ctx context.Context, repoPath string, commitID string) (CountPerLanguage, error) {
reader, err := startGitLinguist(ctx, repoPath, commitID, "breakdown")
if err != nil {
return nil, err
}
data, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
languageFiles := make(FileListPerLanguage)
if err := json.Unmarshal(data, &languageFiles); err != nil {
return nil, err
}
stats := make(CountPerLanguage)
for lang, files := range languageFiles {
stats[lang] = len(files)
}
return stats, nil
}
// Color returns the color Linguist has assigned to language.
func Color(language string) string {
if color := colorMap[language].Color; color != "" {
return color
}
colorSha := sha256.Sum256([]byte(language))
return fmt.Sprintf("#%x", colorSha[0:3])
}
// LoadColors loads the name->color map from the Linguist gem.
func LoadColors(cfg config.Cfg) error {
jsonReader, err := openLanguagesJSON(cfg)
if err != nil {
return err
}
defer jsonReader.Close()
return json.NewDecoder(jsonReader).Decode(&colorMap)
}
func startGitLinguist(ctx context.Context, repoPath string, commitID string, linguistCommand string) (io.Reader, error) {
cmd := exec.Command("bundle", "exec", "bin/ruby-cd", repoPath, "git-linguist", "--commit="+commitID, linguistCommand)
cmd.Dir = config.Config.Ruby.Dir
var env []string
reader, err := command.New(ctx, cmd, nil, nil, nil, exportEnvironment(env)...)
if err != nil {
return nil, err
}
return reader, nil
}
func openLanguagesJSON(cfg config.Cfg) (io.ReadCloser, error) {
if jsonPath := cfg.Ruby.LinguistLanguagesPath; jsonPath != "" {
// This is a fallback for environments where dynamic discovery of the
// linguist path via Bundler is not working for some reason, for example
// https://gitlab.com/gitlab-org/gitaly/issues/1119.
return os.Open(jsonPath)
}
linguistPathSymlink, err := ioutil.TempFile("", "gitaly-linguist-path")
if err != nil {
return nil, err
}
defer os.Remove(linguistPathSymlink.Name())
if err := linguistPathSymlink.Close(); err != nil {
return nil, err
}
// We use a symlink because we cannot trust Bundler to not print garbage
// on its stdout.
rubyScript := `FileUtils.ln_sf(Bundler.rubygems.find_name('github-linguist').first.full_gem_path, ARGV.first)`
cmd := exec.Command("bundle", "exec", "ruby", "-rfileutils", "-e", rubyScript, linguistPathSymlink.Name())
cmd.Dir = config.Config.Ruby.Dir
// We have learned that in practice the command we are about to run is a
// canary for Ruby/Bundler configuration problems. Including stderr and
// stdout in the gitaly log is useful for debugging such problems.
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
err = fmt.Errorf("%v; stderr: %q", exitError, exitError.Stderr)
}
return nil, err
}
return os.Open(path.Join(linguistPathSymlink.Name(), "lib/linguist/languages.json"))
}
func exportEnvironment(env []string) []string {
for _, envVarName := range exportedEnvVars {
if val, ok := os.LookupEnv(envVarName); ok {
env = append(env, fmt.Sprintf("%s=%s", envVarName, val))
}
}
return env
}
|
