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pull.go
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pull.go
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package utils
import (
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"reflect"
"github.com/jsonnet-bundler/jsonnet-bundler/pkg"
"github.com/jsonnet-bundler/jsonnet-bundler/pkg/jsonnetfile"
specv1 "github.com/jsonnet-bundler/jsonnet-bundler/spec/v1"
"github.com/jsonnet-bundler/jsonnet-bundler/spec/v1/deps"
)
const (
sourceFilename = ".source"
versionFilename = ".version"
relPathFilename = ".relpath"
)
func PullSource(dir, uri string) error {
err := WriterLock(dir)
if err != nil {
return err
}
defer Unlock(dir)
spec := specv1.New()
contents, err := json.MarshalIndent(spec, "", " ")
if err != nil {
return err
}
spec.LegacyImports = false
contents = append(contents, []byte("\n")...)
filename := filepath.Join(dir, jsonnetfile.File)
err = os.WriteFile(filename, contents, os.ModePerm)
if err != nil {
return err
}
jbLockFileBytes, err := os.ReadFile(filepath.Join(dir, jsonnetfile.LockFile))
if err != nil && !os.IsNotExist(err) {
return err
}
lockFile, err := jsonnetfile.Unmarshal(jbLockFileBytes)
if err != nil {
return err
}
err = os.MkdirAll(filepath.Join(dir, ".tmp"), os.ModePerm)
if err != nil {
return err
}
d := deps.Parse("", uri)
if d == nil {
return errors.New("unable to parse URI: " + uri)
}
// read d and based on source write uri to uriFilename
source := ""
relPath := ""
version := d.Version
if d.Source.GitSource != nil {
source = d.Source.GitSource.Name()
relPath = source
} else if d.Source.LocalSource != nil {
source = d.Source.LocalSource.Directory
relPath = filepath.Base(source)
version = "local"
} else {
return errors.New("unable to parse URI: " + uri)
}
err = os.WriteFile(filepath.Join(dir, sourceFilename), []byte(source), os.ModePerm)
if err != nil {
return err
}
err = os.WriteFile(filepath.Join(dir, relPathFilename), []byte(relPath), os.ModePerm)
if err != nil {
return err
}
err = os.WriteFile(filepath.Join(dir, versionFilename), []byte(version), os.ModePerm)
if err != nil {
return err
}
if !depEqual(spec.Dependencies[d.Name()], *d) {
spec.Dependencies[d.Name()] = *d
delete(lockFile.Dependencies, d.Name())
}
locked, err := pkg.Ensure(spec, dir, lockFile.Dependencies)
if err != nil {
return err
}
err = writeChangedJsonnetFile(contents, &spec, filename)
if err != nil {
return err
}
err = writeChangedJsonnetFile(jbLockFileBytes, &specv1.JsonnetFile{Dependencies: locked}, filepath.Join(dir, jsonnetfile.LockFile))
if err != nil {
return err
}
return nil
}
func depEqual(d1, d2 deps.Dependency) bool {
name := d1.Name() == d2.Name()
version := d1.Version == d2.Version
source := reflect.DeepEqual(d1.Source, d2.Source)
return name && version && source
}
func writeChangedJsonnetFile(originalBytes []byte, modified *specv1.JsonnetFile, path string) error {
origJsonnetFile, err := jsonnetfile.Unmarshal(originalBytes)
if err != nil {
return err
}
if reflect.DeepEqual(origJsonnetFile, *modified) {
return nil
}
return writeJSONFile(path, *modified)
}
func writeJSONFile(name string, d interface{}) error {
b, err := json.MarshalIndent(d, "", " ")
if err != nil {
return fmt.Errorf("error encoding json: %w", err)
}
b = append(b, []byte("\n")...)
// nolint: gosec
return os.WriteFile(name, b, 0o644)
}
// GetSource returns the source of the dependency.
func GetSource(dir string) string {
source := ""
// if it does not exist, continue
if _, err := os.Stat(filepath.Join(dir, sourceFilename)); err == nil {
sourceBytes, err := os.ReadFile(filepath.Join(dir, sourceFilename))
if err == nil {
source = string(sourceBytes)
}
}
return source
}
// GetVersion returns the version of the dependency.
func GetVersion(dir string) string {
version := ""
// if it does not exist, continue
if _, err := os.Stat(filepath.Join(dir, versionFilename)); err == nil {
versionBytes, err := os.ReadFile(filepath.Join(dir, versionFilename))
if err == nil {
version = string(versionBytes)
}
}
return version
}
// GetRelPath returns the relative path to the dependency.
func GetRelPath(dir string) string {
relPath := ""
// if it does not exist, continue
if _, err := os.Stat(filepath.Join(dir, relPathFilename)); err == nil {
relPathBytes, err := os.ReadFile(filepath.Join(dir, relPathFilename))
if err == nil {
relPath = string(relPathBytes)
}
}
return relPath
}