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package main

import ( “bufio” “fmt” “log” “os” “path/filepath” “strings”

"github.com/sourcegraph/zoekt"

)

func merge(dstDir string, names []string) error { var files []zoekt.IndexFile for _, fn := range names { f, err := os.Open(fn) if err != nil { return err } defer f.Close()

    indexFile, err := zoekt.NewIndexFile(f)
          if err != nil {
          return err
          }
          defer indexFile.Close()
          
          files = append(files, indexFile)
          }
          tmpName, dstName, err := zoekt.Merge(dstDir, files...)
          if err != nil {
          return err
          }
          // Delete input shards.
          for _, name := range names {
          paths, err := zoekt.IndexFilePaths(name)
          if err != nil {
          return fmt.Errorf("zoekt-merge-index: %w", err)
          }
          for _, p := range paths {
          if err := os.Remove(p); err != nil {
          return fmt.Errorf("zoekt-merge-index: failed to remove simple shard: %w", err)
          }
          }
          }
          // We only rename the compound shard if all simple shards could be deleted in the
          // previous step. This guarantees we won't have duplicate indexes.
          if err := os.Rename(tmpName, dstName); err != nil {
          return fmt.Errorf("zoekt-merge-index: failed to rename compound shard: %w", err)
          }
          return nil

}

func mergeCmd(paths []string) error { if paths[0] == “-” { paths = []string{} scanner := bufio.NewScanner(os.Stdin) for scanner.Scan() { paths = append(paths, strings.TrimSpace(scanner.Text())) } if err := scanner.Err(); err != nil { return err } log.Printf(“merging %d paths from stdin”, len(paths)) }

return merge(filepath.Dir(paths[0]), paths)

}

// explode splits the input shard into individual shards and places them in dstDir. // Temporary files created in the process are removed on a best effort basis. func explode(dstDir string, inputShard string) error { f, err := os.Open(inputShard) if err != nil { return err } defer f.Close()

indexFile, err := zoekt.NewIndexFile(f)
          if err != nil {
          return err
          }
          defer indexFile.Close()
          
          exploded, err := zoekt.Explode(dstDir, indexFile)
          defer func() {
          // best effort removal of tmp files. If os.Remove fails, indexserver will delete
          // the leftover tmp files during the next cleanup.
          for tmpFn := range exploded {
          os.Remove(tmpFn)
          }
          }()
          if err != nil {
          return fmt.Errorf("zoekt.Explode: %w", err)
          }
          // remove the input shard first to avoid duplicate indexes. In the worst case,
          // the process is interrupted just after we delete the compound shard, in which
          // case we have to reindex the lost repos.
          paths, err := zoekt.IndexFilePaths(inputShard)
          if err != nil {
          return err
          }
          for _, path := range paths {
          err = os.Remove(path)
          if err != nil {
          return err
          }
          }
          // best effort rename shards.
          for tmpFn, dstFn := range exploded {
          if err := os.Rename(tmpFn, dstFn); err != nil {
          log.Printf("explode: rename failed: %s", err)
          }
          }
          return nil

}

func explodeCmd(path string) error { return explode(filepath.Dir(path), path) }

func main() { switch subCommand := os.Args[1]; subCommand { case “merge”: if err := mergeCmd(os.Args[2:]); err != nil { log.Fatal(err) } case “explode”: if err := explodeCmd(os.Args[2]); err != nil { log.Fatal(err) } default: log.Fatalf(“unknown subcommand %s”, subCommand) } }

Explanation

This code provides two commands: merge and explode, both operating on Zoekt index files.

merge Command:

mergeCmd:
Takes a list of index file paths as input. If the first path is “-“, it reads paths from standard input.
Calls the merge function with the destination directory (extracted from the first path) and the list of paths.
merge:
Opens each input index file and creates a zoekt.IndexFile object.
Calls zoekt.Merge with the destination directory and the IndexFile objects to merge them into a single compound index.
Removes the original simple shards (individual index files) after the merge is complete.
Renames the temporary compound shard to the final destination path.

explode Command:

explodeCmd:
Takes a single index file path as input.
Calls the explode function with the destination directory (extracted from the path) and the input index file.
explode:
Opens the input index file and creates a zoekt.IndexFile object.
Calls zoekt.Explode to split the compound shard into individual shards.
Removes the input compound shard.
Attempts to rename the temporary individual shards to their final destinations.

Key points:

The code uses zoekt.IndexFile, zoekt.Merge, and zoekt.Explode from the github.com/sourcegraph/zoekt package for index file operations.
It uses error handling throughout and returns errors for any issues encountered during file operations.
The code ensures atomicity by first deleting the original files and then renaming the new files, avoiding duplicate indexes.
It performs cleanup operations on temporary files, even in case of errors, to minimize potential issues.

In summary:

This code allows users to merge multiple Zoekt index files into a single compound index or to explode a compound index into individual shards. The code is well-structured, handles errors appropriately, and ensures atomicity for its operations.

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