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package storage
import (
"context"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
type GitCmdAdapter struct {
s3Storage *S3Storage
tempDir string
}
func NewGitCmdAdapter(s3Storage *S3Storage) *GitCmdAdapter {
tempDir, err := os.MkdirTemp("", "giddy-repos-")
if err != nil {
panic(fmt.Sprintf("failed to create temp directory: %v", err))
}
return &GitCmdAdapter{
s3Storage: s3Storage,
tempDir: tempDir,
}
}
func (g *GitCmdAdapter) Cleanup() {
os.RemoveAll(g.tempDir)
}
// GetObject gets a Git object using git cat-file
func (g *GitCmdAdapter) GetObject(ctx context.Context, repo, objectID string) ([]byte, error) {
repoPath, err := g.ensureRepository(ctx, repo)
if err != nil {
return nil, err
}
// Get object type first
typeCmd := exec.CommandContext(ctx, "git", "--git-dir", repoPath, "cat-file", "-t", objectID)
typeOutput, err := typeCmd.Output()
if err != nil {
return nil, fmt.Errorf("git cat-file -t failed for %s: %w", objectID, err)
}
objType := strings.TrimSpace(string(typeOutput))
// Get raw object content using type and objectID
contentCmd := exec.CommandContext(ctx, "git", "--git-dir", repoPath, "cat-file", objType, objectID)
content, err := contentCmd.Output()
if err != nil {
return nil, fmt.Errorf("git cat-file failed for %s: %w", objectID, err)
}
// Format as Git object: "type size\0content"
result := fmt.Sprintf("%s %d\x00", objType, len(content))
return append([]byte(result), content...), nil
}
// GetReachableObjects returns all objects reachable from the given commits
func (g *GitCmdAdapter) GetReachableObjects(ctx context.Context, repo string, wants []string, haves []string) ([]string, error) {
repoPath, err := g.ensureRepository(ctx, repo)
if err != nil {
return nil, err
}
// Use git rev-list to get all reachable objects
args := []string{"--git-dir", repoPath, "rev-list", "--objects"}
args = append(args, wants...)
// Exclude objects reachable from haves
for _, have := range haves {
args = append(args, "^"+have)
}
cmd := exec.CommandContext(ctx, "git", args...)
output, err := cmd.Output()
if err != nil {
return nil, fmt.Errorf("git rev-list failed: %w", err)
}
var objects []string
lines := strings.Split(strings.TrimSpace(string(output)), "\n")
for _, line := range lines {
if line == "" {
continue
}
// Each line is: "objectid [path]"
parts := strings.Fields(line)
if len(parts) > 0 {
objects = append(objects, parts[0])
}
}
log.Printf("Found %d reachable objects", len(objects))
return objects, nil
}
func (g *GitCmdAdapter) ensureRepository(ctx context.Context, repo string) (string, error) {
repoPath := filepath.Join(g.tempDir, strings.ReplaceAll(repo, "/", "_"))
// Check if already downloaded (check for any git files)
if _, err := os.Stat(filepath.Join(repoPath, "objects")); err == nil {
log.Printf("Repository %s already downloaded to %s", repo, repoPath)
return repoPath, nil
}
log.Printf("Downloading repository %s from S3 to %s", repo, repoPath)
// Create repo directory
err := os.MkdirAll(repoPath, 0755)
if err != nil {
return "", fmt.Errorf("failed to create repo directory: %w", err)
}
// Download all repository files from S3 with timeout
downloadCtx, cancel := context.WithTimeout(ctx, 300*time.Second)
defer cancel()
err = g.downloadRepositoryFromS3(downloadCtx, repo, repoPath)
if err != nil {
return "", fmt.Errorf("failed to download repository: %w", err)
}
log.Printf("Successfully downloaded repository %s", repo)
return repoPath, nil
}
func (g *GitCmdAdapter) downloadRepositoryFromS3(ctx context.Context, repo, localPath string) error {
// List all objects in the repository
prefix := repo + "/"
paginator := s3.NewListObjectsV2Paginator(g.s3Storage.client, &s3.ListObjectsV2Input{
Bucket: aws.String(g.s3Storage.bucket),
Prefix: aws.String(prefix),
})
for paginator.HasMorePages() {
page, err := paginator.NextPage(ctx)
if err != nil {
return fmt.Errorf("failed to list objects: %w", err)
}
for _, obj := range page.Contents {
key := *obj.Key
relativePath := strings.TrimPrefix(key, prefix)
if relativePath == "" {
continue // Skip the prefix itself
}
localFilePath := filepath.Join(localPath, relativePath)
// Create directory if needed
dir := filepath.Dir(localFilePath)
err := os.MkdirAll(dir, 0755)
if err != nil {
return fmt.Errorf("failed to create directory %s: %w", dir, err)
}
// Download the file
err = g.downloadFile(ctx, key, localFilePath)
if err != nil {
return fmt.Errorf("failed to download %s: %w", key, err)
}
log.Printf("Downloaded: %s -> %s", key, localFilePath)
}
}
return nil
}
func (g *GitCmdAdapter) downloadFile(ctx context.Context, s3Key, localPath string) error {
result, err := g.s3Storage.client.GetObject(ctx, &s3.GetObjectInput{
Bucket: aws.String(g.s3Storage.bucket),
Key: aws.String(s3Key),
})
if err != nil {
return err
}
defer result.Body.Close()
file, err := os.Create(localPath)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(file, result.Body)
return err
}
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