commit e9219b88de5ed37af337ee2d2e71e7ec7c0aad1b
Author: Robbert van Ginkel <rvanginkel@buf.build>
Date:   Thu Oct 20 16:43:28 2022 -0400

    Fix git unit test by using fake git server rather than file:// (#1518)
    
    More recent versions of git fix a CVE by disabling some usage of the
    `file://` transport, see
    https://github.blog/2022-10-18-git-security-vulnerabilities-announced/#cve-2022-39253.
    We were using this transport in tests.
    
    Instead, use https://git-scm.com/docs/git-http-backend to serve up this
    repository locally so we don't have to use the file protocol. This
    should be a more accurate tests, since we mostly expect submodules to
    come from servers.

diff --git a/.golangci.yml b/.golangci.yml
index 318d1171..865e03e7 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -136,3 +136,8 @@ issues:
     - linters:
         - containedctx
       path: private/bufpkg/bufmodule/bufmoduleprotocompile
+      # We should be able to use net/http/cgi in a unit test, in addition the CVE mentions only versions of go < 1.6.3 are affected.
+    - linters:
+        - gosec
+      path: private/pkg/git/git_test.go
+      text: "G504:"
diff --git a/private/pkg/git/git_test.go b/private/pkg/git/git_test.go
index 7b77b6cd..7132054e 100644
--- a/private/pkg/git/git_test.go
+++ b/private/pkg/git/git_test.go
@@ -17,6 +17,8 @@ package git
 import (
 	"context"
 	"errors"
+	"net/http/cgi"
+	"net/http/httptest"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -213,6 +215,21 @@ func createGitDirs(
 	runCommand(ctx, t, container, runner, "git", "-C", submodulePath, "add", "test.proto")
 	runCommand(ctx, t, container, runner, "git", "-C", submodulePath, "commit", "-m", "commit 0")
 
+	gitExecPath, err := command.RunStdout(ctx, container, runner, "git", "--exec-path")
+	require.NoError(t, err)
+	t.Log(filepath.Join(string(gitExecPath), "git-http-backend"))
+	// https://git-scm.com/docs/git-http-backend#_description
+	f, err := os.Create(filepath.Join(submodulePath, ".git", "git-daemon-export-ok"))
+	require.NoError(t, err)
+	require.NoError(t, f.Close())
+	server := httptest.NewServer(&cgi.Handler{
+		Path: filepath.Join(strings.TrimSpace(string(gitExecPath)), "git-http-backend"),
+		Dir:  submodulePath,
+		Env:  []string{"GIT_PROJECT_ROOT=" + submodulePath},
+	})
+	t.Cleanup(server.Close)
+	submodulePath = server.URL
+
 	originPath := filepath.Join(tmpDir, "origin")
 	require.NoError(t, os.MkdirAll(originPath, 0777))
 	runCommand(ctx, t, container, runner, "git", "-C", originPath, "init")