Fix graphql rev.dir for empty path

Author: LMG

src/graphql.rs

@@ -463,11 +463,16 @@ impl Path {
         to_result: impl FnOnce(&cache::Transaction, git2::Oid) -> FieldResult<R>,
     ) -> FieldResult<R> {
         let transaction = context.transaction.lock()?;
-        let id = transaction
-            .repo()
-            .find_tree(self.tree)?
-            .get_path(&self.path)?
-            .id();
+
+        let id = if self.path == std::path::Path::new("") {
+            self.tree
+        } else {
+            transaction
+                .repo()
+                .find_tree(self.tree)?
+                .get_path(&self.path)?
+                .id()
+        };
         to_result(&transaction, id)
     }
 

tests/proxy/graphql_path.t

@@ -0,0 +1,64 @@
+  $ . ${TESTDIR}/setup_test_env.sh
+  $ cd ${TESTTMP}
+
+
+  $ git clone -q http://localhost:8001/real_repo.git
+  warning: You appear to have cloned an empty repository.
+
+  $ curl -s http://localhost:8002/version
+  Version: 0.3.0
+
+  $ cd real_repo
+
+  $ git status
+  On branch master
+  
+  No commits yet
+  
+  nothing to commit (create/copy files and use "git add" to track)
+
+  $ git checkout -b master
+  Switched to a new branch 'master'
+
+  $ mkdir ws
+  $ cat > ws/file1 <<EOF
+  > content
+  > EOF
+  $ mkdir ws2
+  $ cat > ws2/file2 <<EOF
+  > content2
+  > EOF
+
+  $ git add ws*/*
+  $ git commit -m "add file1" 1> /dev/null
+
+  $ git push
+  To http://localhost:8001/real_repo.git
+   * [new branch]      master -> master
+
+  $ cd ${TESTTMP}
+
+  $ cat > ../query << EOF
+  > {"query": "{
+  >  rev(at:\"refs/heads/master\") {
+  >    dir {
+  >      path
+  >      hash
+  >    }
+  >  }
+  > }"}
+  > EOF
+
+  $ cat ../query | curl -s -X POST -H "content-type: application/json" --data @- "http://localhost:8002/~/graphql/real_repo.git"
+  {
+    "data": {
+      "rev": {
+        "dir": {
+          "path": "",
+          "hash": "fcd9aba1ef0c6d812452bdcb04ac155f5d7f42d6"
+        }
+      }
+    }
+  } (no-eol)
+
+$ cat ${TESTTMP}/josh-proxy.out