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|
/*
generate.go is a program that generates the Gazelle YAML manifest.
The Gazelle manifest is a file that contains extra information required when
generating the Bazel BUILD files.
*/
package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"os"
"strings"
"github.com/bazelbuild/rules_python/gazelle/manifest"
)
func init() {
if os.Getenv("BUILD_WORKSPACE_DIRECTORY") == "" {
log.Fatalln("ERROR: this program must run under Bazel")
}
}
func main() {
var manifestGeneratorHashPath string
var requirementsPath string
var pipRepositoryName string
var modulesMappingPath string
var outputPath string
var updateTarget string
flag.StringVar(
&manifestGeneratorHashPath,
"manifest-generator-hash",
"",
"The file containing the hash for the source code of the manifest generator."+
"This is important to force manifest updates when the generator logic changes.")
flag.StringVar(
&requirementsPath,
"requirements",
"",
"The requirements.txt file.")
flag.StringVar(
&pipRepositoryName,
"pip-repository-name",
"",
"The name of the pip_install or pip_repository target.")
flag.StringVar(
&modulesMappingPath,
"modules-mapping",
"",
"The modules_mapping.json file.")
flag.StringVar(
&outputPath,
"output",
"",
"The output YAML manifest file.")
flag.StringVar(
&updateTarget,
"update-target",
"",
"The Bazel target to update the YAML manifest file.")
flag.Parse()
if requirementsPath == "" {
log.Fatalln("ERROR: --requirements must be set")
}
if modulesMappingPath == "" {
log.Fatalln("ERROR: --modules-mapping must be set")
}
if outputPath == "" {
log.Fatalln("ERROR: --output must be set")
}
if updateTarget == "" {
log.Fatalln("ERROR: --update-target must be set")
}
modulesMapping, err := unmarshalJSON(modulesMappingPath)
if err != nil {
log.Fatalf("ERROR: %v\n", err)
}
header := generateHeader(updateTarget)
manifestFile := manifest.NewFile(&manifest.Manifest{
ModulesMapping: modulesMapping,
PipRepository: &manifest.PipRepository{
Name: pipRepositoryName,
},
})
if err := writeOutput(
outputPath,
header,
manifestFile,
manifestGeneratorHashPath,
requirementsPath,
); err != nil {
log.Fatalf("ERROR: %v\n", err)
}
}
// unmarshalJSON returns the parsed mapping from the given JSON file path.
func unmarshalJSON(jsonPath string) (map[string]string, error) {
file, err := os.Open(jsonPath)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal JSON file: %w", err)
}
defer file.Close()
decoder := json.NewDecoder(file)
output := make(map[string]string)
if err := decoder.Decode(&output); err != nil {
return nil, fmt.Errorf("failed to unmarshal JSON file: %w", err)
}
return output, nil
}
// generateHeader generates the YAML header human-readable comment.
func generateHeader(updateTarget string) string {
var header strings.Builder
header.WriteString("# GENERATED FILE - DO NOT EDIT!\n")
header.WriteString("#\n")
header.WriteString("# To update this file, run:\n")
header.WriteString(fmt.Sprintf("# bazel run %s\n", updateTarget))
return header.String()
}
// writeOutput writes to the final file the header and manifest structure.
func writeOutput(
outputPath string,
header string,
manifestFile *manifest.File,
manifestGeneratorHashPath string,
requirementsPath string,
) error {
stat, err := os.Stat(outputPath)
if err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
outputFile, err := os.OpenFile(outputPath, os.O_WRONLY|os.O_TRUNC, stat.Mode())
if err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
defer outputFile.Close()
if _, err := fmt.Fprintf(outputFile, "%s\n", header); err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
manifestGeneratorHash, err := os.Open(manifestGeneratorHashPath)
if err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
defer manifestGeneratorHash.Close()
requirements, err := os.Open(requirementsPath)
if err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
defer requirements.Close()
if err := manifestFile.Encode(outputFile, manifestGeneratorHash, requirements); err != nil {
return fmt.Errorf("failed to write output: %w", err)
}
return nil
}
|
