1 files changed, 22 insertions, 1 deletions
diff --git a/src/libexpr/primops/fetchTree.cc b/src/libexpr/primops/fetchTree.cc
index 69395ad3d..ffc6f5859 100644
--- a/src/libexpr/primops/fetchTree.cc
+++ b/src/libexpr/primops/fetchTree.cc
@@ -4,6 +4,7 @@
 #include "fetchers.hh"
 #include "filetransfer.hh"
 #include "registry.hh"
+#include "url.hh"
 
 #include <ctime>
 #include <iomanip>
@@ -68,7 +69,16 @@ void emitTreeAttrs(
 std::string fixURI(std::string uri, EvalState & state, const std::string & defaultScheme = "file")
 {
     state.checkURI(uri);
-    return uri.find("://") != std::string::npos ? uri : defaultScheme + "://" + uri;
+    if (uri.find("://") == std::string::npos) {
+        const auto p = ParsedURL {
+            .scheme = defaultScheme,
+            .authority = "",
+            .path = uri
+        };
+        return p.to_string();
+    } else {
+        return uri;
+    }
 }
 
 std::string fixURIForGit(std::string uri, EvalState & state)
@@ -461,6 +471,17 @@ static RegisterPrimOp primop_fetchGit({
           > **Note**
           >
           > This behavior is disabled in *Pure evaluation mode*.
+
+        - To fetch the content of a checked-out work directory:
+
+          ```nix
+          builtins.fetchGit ./work-dir
+          ```
+
+	  If the URL points to a local directory, and no `ref` or `rev` is
+	  given, `fetchGit` will use the current content of the checked-out
+	  files, even if they are not committed or added to Git's index. It will
+	  only consider files added to the Git repository, as listed by `git ls-files`.
     )",
     .fun = prim_fetchGit,
 });