add support for an http git server !

Author: pomdtr

example/git/main.ts

@@ -0,0 +1,20 @@
+const { SMALLWEB_SOCKET_PATH } = Deno.env.toObject();
+
+const client = Deno.createHttpClient({
+    proxy: {
+        transport: "unix",
+        path: SMALLWEB_SOCKET_PATH,
+    },
+});
+
+export default {
+    fetch: (req: Request) => {
+        const url = new URL(req.url);
+        url.host = "git.localhost";
+
+        return fetch(
+            new Request(url, req),
+            { client },
+        );
+    },
+};

internal/api/api.go

@@ -3,7 +3,11 @@ package api
 import (
 	"context"
 	"net/http"
+	"net/http/cgi"
+	"os"
+	"os/exec"
 	"path/filepath"
+	"strings"
 
 	"github.com/danielgtaylor/huma/v2"
 	"github.com/danielgtaylor/huma/v2/adapters/humachi"
@@ -42,6 +46,7 @@ func NewHandler(conf *utils.Config) http.Handler {
 
 	hr.Map("webdav.localhost", webdavRouter(conf))
 	hr.Map("api.localhost", apiRouter(conf))
+	hr.Map("git.localhost", gitRouter(conf))
 	hr.Map("*", catchAllRouter())
 
 	r.Mount("/", hr)
@@ -121,6 +126,46 @@ func apiRouter(conf *utils.Config) chi.Router {
 	return r
 }
 
+func gitRouter(conf *utils.Config) chi.Router {
+	r := chi.NewRouter()
+
+	repoRoot := filepath.Join(conf.String("dir"))
+
+	gitPath, err := exec.LookPath("git")
+	if err != nil {
+		r.HandleFunc("/*", func(w http.ResponseWriter, r *http.Request) {
+			http.Error(w, "git binary not found on server", http.StatusInternalServerError)
+		})
+		return r
+	}
+
+	gitHandler := &cgi.Handler{
+		Path: gitPath,
+		Args: []string{"http-backend"},
+		Env: []string{
+			"GIT_PROJECT_ROOT=" + repoRoot,
+			"GIT_HTTP_EXPORT_ALL=", // allow read-only access
+		},
+		Stderr: os.Stderr,
+		InheritEnv: []string{
+			"PATH", "HOME", // inherit some safe env vars
+		},
+	}
+
+	r.HandleFunc("/*", func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasSuffix(r.URL.Path, "/git-receive-pack") {
+			http.Error(w, "pushes are disabled", http.StatusForbidden)
+			return
+		}
+
+		fixChunked(r)
+
+		gitHandler.ServeHTTP(w, r)
+	})
+
+	return r
+}
+
 func catchAllRouter() chi.Router {
 	r := chi.NewRouter()
 
@@ -131,3 +176,14 @@ func catchAllRouter() chi.Router {
 
 	return r
 }
+
+func fixChunked(req *http.Request) {
+	if len(req.TransferEncoding) > 0 && req.TransferEncoding[0] == `chunked` {
+		// hacking!
+		req.TransferEncoding = nil
+		req.Header.Set(`Transfer-Encoding`, `chunked`)
+
+		// let cgi use Body.
+		req.ContentLength = -1
+	}
+}

internal/cmd/git.go

@@ -26,7 +26,7 @@ func NewCmdGitReceivePack() *cobra.Command {
 				return ExitError{1}
 			}
 
-			gitCmd := exec.Command("git-receive-pack", a.Dir)
+			gitCmd := exec.Command("git", "receive-pack", a.Dir)
 
 			gitCmd.Stdin = cmd.InOrStdin()
 			gitCmd.Stdout = cmd.OutOrStdout()
@@ -65,7 +65,7 @@ func NewCmdGitUploadPack() *cobra.Command {
 				return ExitError{1}
 			}
 
-			gitCmd := exec.Command("git-upload-pack", a.Dir)
+			gitCmd := exec.Command("git", "upload-pack", a.Dir)
 
 			gitCmd.Stdin = cmd.InOrStdin()
 			gitCmd.Stdout = cmd.OutOrStdout()