Resolve source operations from the Git checkout root

build.go

@@ -6,6 +6,7 @@ import (
 
 	"gitea.maximumdirect.net/eric/ReleaseKit/internal/artifact"
 	internalbuild "gitea.maximumdirect.net/eric/ReleaseKit/internal/build"
+	"gitea.maximumdirect.net/eric/ReleaseKit/internal/git"
 	"gitea.maximumdirect.net/eric/ReleaseKit/internal/releaseidentity"
 )
 
@@ -24,7 +25,7 @@ type BuildSpec struct {
 
 // BuildRequest contains the source and output settings for Build.
 type BuildRequest struct {
-	RepositoryDir string // source repository whose current HEAD is recorded.
+	RepositoryDir string // directory within the source Git checkout whose HEAD is recorded.
 	// ModuleDir selects a repository-relative module directory; empty selects
 	// the repository root.
 	ModuleDir string
@@ -71,7 +72,11 @@ type BuildResult struct {
 // Errors return partial build facts in the result.
 func Build(ctx context.Context, request BuildRequest) (BuildResult, error) {
 	public := BuildResult{Version: request.Version}
-	identity, err := releaseidentity.FromWorkingTree(ctx, request.RepositoryDir, request.ModuleDir, request.Version)
+	repositoryDir, err := git.RepositoryRoot(ctx, request.RepositoryDir)
+	if err != nil {
+		return public, err
+	}
+	identity, err := releaseidentity.FromWorkingTree(ctx, repositoryDir, request.ModuleDir, request.Version)
 	if err != nil {
 		return public, err
 	}