Create repositories with go-git

README.md

@@ -8,7 +8,8 @@ utilising the power of Go.
 
 ## Dependencies
 
-- Git >= 1.7
+- Go >= 1.25 to build or embed the server
+- Native Git for HTTP push/fetch; repository creation uses go-git in-process
 
 ## Install
 
@@ -74,6 +75,33 @@ func main() {
 }
 ```
 
+## Repository creation
+
+Use an instance with a storage implementation to create and serve repositories:
+
+```go
+store := server.NewFilesystemStore("/srv/git")
+srv := server.New(server.DefaultConfig, store)
+
+repo, err := srv.CreateRepository(context.Background(), "team/example.git")
+if err != nil {
+    log.Fatal(err)
+}
+log.Printf("Created %s", repo.Path())
+log.Fatal(http.ListenAndServe(":8080", srv))
+```
+
+`CreateRepository` allocates storage and initializes a bare repository using
+go-git, without invoking Git. If initialization fails, it attempts to delete the
+allocated storage and reports any cleanup error. `Store.Create` alone only
+allocates storage; it does not initialize Git. Filesystem repository names must
+end in `.git` and may include namespaces such as `team/example.git`.
+
+Custom stores implement `Open`, `Create`, `Delete`, `Exists`, and `List`.
+Repositories currently expose a local filesystem `Path()`, which both go-git
+initialization and native Git HTTP operations use. Remote object storage is not
+yet supported directly by this interface.
+
 ## License
 
 ```

go.mod

@@ -1,3 +1,28 @@
 module github.com/asim/git-http-backend
 
-go 1.20
+go 1.25.0
+
+require github.com/go-git/go-git/v5 v5.19.2
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
+	github.com/cloudflare/circl v1.6.3 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.9.0 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/pjbgf/sha1cd v0.6.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+)

go.sum

@@ -0,0 +1,104 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
+github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
+github.com/cyphar/filepath-securejoin v0.6.1 h1:5CeZ1jPXEiYt3+Z6zqprSAgSWiggmpVyciv8syjIpVE=
+github.com/cyphar/filepath-securejoin v0.6.1/go.mod h1:A8hd4EnAeyujCJRrICiOWqjS1AX0a9kM5XL+NwKoYSc=
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server/repository.go

@@ -0,0 +1,25 @@
+package server
+
+import (
+	"context"
+	"fmt"
+
+	git "github.com/go-git/go-git/v5"
+)
+
+// CreateRepository allocates repository storage and initializes it as a bare Git repository.
+func (s *Server) CreateRepository(ctx context.Context, name string) (Repository, error) {
+	repo, err := s.Store.Create(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err := git.PlainInit(repo.Path(), true); err != nil {
+		if cleanupErr := s.Store.Delete(context.Background(), name); cleanupErr != nil {
+			return nil, fmt.Errorf("initialize bare repository: %w; cleanup failed: %v", err, cleanupErr)
+		}
+		return nil, fmt.Errorf("initialize bare repository: %w", err)
+	}
+
+	return repo, nil
+}

server/repository_test.go

@@ -0,0 +1,181 @@
+package server
+
+import (
+	"context"
+	"errors"
+	"net/http/httptest"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	git "github.com/go-git/go-git/v5"
+)
+
+func TestCreateRepositoryInitializesBareRepository(t *testing.T) {
+	ctx := context.Background()
+	store := NewFilesystemStore(t.TempDir())
+	srv := New(Config{}, store)
+
+	repo, err := srv.CreateRepository(ctx, "team/example.git")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	opened, err := git.PlainOpen(repo.Path())
+	if err != nil {
+		t.Fatalf("open created repository: %v", err)
+	}
+	if _, err := opened.Worktree(); !errors.Is(err, git.ErrIsBareRepository) {
+		t.Fatalf("expected bare repository, got %v", err)
+	}
+
+	if _, err := os.Stat(filepath.Join(repo.Path(), "HEAD")); err != nil {
+		t.Fatalf("expected bare repository HEAD: %v", err)
+	}
+}
+
+type failingCreateStore struct {
+	path      string
+	deleted   bool
+	deleteErr error
+}
+
+func (s *failingCreateStore) Open(context.Context, string) (Repository, error) {
+	return nil, ErrRepositoryNotFound
+}
+
+func (s *failingCreateStore) Create(context.Context, string) (Repository, error) {
+	return testRepository(s.path), nil
+}
+
+func (s *failingCreateStore) Delete(context.Context, string) error {
+	s.deleted = true
+	return s.deleteErr
+}
+
+func (s *failingCreateStore) Exists(context.Context, string) (bool, error) { return false, nil }
+func (s *failingCreateStore) List(context.Context) ([]string, error)       { return nil, nil }
+
+func TestCreateRepositoryCleansUpOnInitFailure(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "not-a-directory")
+	if err := os.WriteFile(path, []byte("x"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	store := &failingCreateStore{path: path}
+	srv := New(Config{}, store)
+
+	_, err := srv.CreateRepository(context.Background(), "example.git")
+	if err == nil {
+		t.Fatal("expected repository initialization to fail")
+	}
+	if !store.deleted {
+		t.Fatal("expected allocated repository to be deleted after init failure")
+	}
+}
+
+func TestCreateRepositoryPreservesStoreError(t *testing.T) {
+	want := errors.New("storage unavailable")
+	store := &repositoryCreateErrorStore{err: want}
+	srv := New(Config{}, store)
+
+	_, err := srv.CreateRepository(context.Background(), "example.git")
+	if !errors.Is(err, want) {
+		t.Fatalf("expected %v, got %v", want, err)
+	}
+}
+
+type repositoryCreateErrorStore struct{ err error }
+
+func (s *repositoryCreateErrorStore) Open(context.Context, string) (Repository, error) {
+	return nil, ErrRepositoryNotFound
+}
+func (s *repositoryCreateErrorStore) Create(context.Context, string) (Repository, error) {
+	return nil, s.err
+}
+func (s *repositoryCreateErrorStore) Delete(context.Context, string) error         { return nil }
+func (s *repositoryCreateErrorStore) Exists(context.Context, string) (bool, error) { return false, nil }
+func (s *repositoryCreateErrorStore) List(context.Context) ([]string, error)       { return nil, nil }
+
+func TestCreateRepositoryNativeHTTPPushAndClone(t *testing.T) {
+	gitBin, err := exec.LookPath("git")
+	if err != nil {
+		t.Skip("native git is required for HTTP integration test")
+	}
+	config := DefaultConfig
+	config.GitBinPath = gitBin
+	srv := New(config, NewFilesystemStore(t.TempDir()))
+	if _, err := srv.CreateRepository(context.Background(), "team/example.git"); err != nil {
+		t.Fatal(err)
+	}
+	httpServer := httptest.NewServer(srv)
+	defer httpServer.Close()
+
+	run := func(dir string, args ...string) string {
+		t.Helper()
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer cancel()
+		cmd := exec.CommandContext(ctx, gitBin, args...)
+		cmd.Dir = dir
+		cmd.Env = append(os.Environ(), "GIT_CONFIG_NOSYSTEM=1", "GIT_CONFIG_GLOBAL="+os.DevNull, "GIT_TERMINAL_PROMPT=0")
+		out, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Fatalf("git %v: %v\n%s", args, err, out)
+		}
+		return strings.TrimSpace(string(out))
+	}
+	source := t.TempDir()
+	run(source, "init")
+	run(source, "symbolic-ref", "HEAD", "refs/heads/master")
+	if err := os.WriteFile(filepath.Join(source, "hello.txt"), []byte("hello from native git\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	run(source, "add", "hello.txt")
+	run(source, "-c", "user.name=Test", "-c", "user.email=test@example.com", "-c", "commit.gpgsign=false", "commit", "-m", "initial commit")
+	url := httpServer.URL + "/team/example.git"
+	run(source, "push", url, "master")
+	clone := filepath.Join(t.TempDir(), "clone")
+	run(source, "clone", url, clone)
+	if got, want := run(clone, "rev-parse", "HEAD"), run(source, "rev-parse", "HEAD"); got != want {
+		t.Fatalf("cloned commit = %s, want %s", got, want)
+	}
+	contents, err := os.ReadFile(filepath.Join(clone, "hello.txt"))
+	if err != nil || string(contents) != "hello from native git\n" {
+		t.Fatalf("cloned file = %q, error = %v", contents, err)
+	}
+}
+
+func TestCreateRepositoryReportsCleanupFailure(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "not-a-directory")
+	if err := os.WriteFile(path, []byte("x"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	store := &failingCreateStore{path: path, deleteErr: errors.New("delete unavailable")}
+	_, err := New(Config{}, store).CreateRepository(context.Background(), "example.git")
+	if err == nil || !strings.Contains(err.Error(), "cleanup failed: delete unavailable") {
+		t.Fatalf("expected initialization and cleanup failure, got %v", err)
+	}
+	var pathErr *os.PathError
+	if !errors.As(err, &pathErr) {
+		t.Fatalf("initialization error not preserved: %v", err)
+	}
+}
+
+func TestCreateRepositoryDoesNotDeleteExistingRepository(t *testing.T) {
+	store := NewFilesystemStore(t.TempDir())
+	srv := New(Config{}, store)
+	repo, err := srv.CreateRepository(context.Background(), "example.git")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = srv.CreateRepository(context.Background(), "example.git")
+	if !errors.Is(err, ErrRepositoryExists) {
+		t.Fatalf("expected existing repository error, got %v", err)
+	}
+	if _, err := git.PlainOpen(repo.Path()); err != nil {
+		t.Fatalf("existing repository damaged: %v", err)
+	}
+}