unset renv project

pre_commit/languages/r.py

@@ -8,6 +8,7 @@ from typing import Tuple
 
 from pre_commit.envcontext import envcontext
 from pre_commit.envcontext import PatchesT
+from pre_commit.envcontext import UNSET
 from pre_commit.hook import Hook
 from pre_commit.languages import helpers
 from pre_commit.prefix import Prefix
@@ -23,6 +24,7 @@ healthy = helpers.basic_healthy
 def get_env_patch(venv: str) -> PatchesT:
     return (
         ('R_PROFILE_USER', os.path.join(venv, 'activate.R')),
+        ('RENV_PROJECT', UNSET),
     )
 
 
@@ -54,11 +56,12 @@ def _prefix_if_non_local_file_entry(
             path = prefix.path(entry[1])
         return (path,)
 
-def _rscript_exec():
+
+def _rscript_exec() -> str:
     """
     When invoked in a sub-process of R, use full path
     """
-    return os.path.join(os.getenv('R_HOME', ""), 'Rscript')
+    return os.path.join(os.getenv('R_HOME', ''), 'Rscript')
 
 
 def _entry_validate(entry: Sequence[str]) -> None:
@@ -101,7 +104,7 @@ def install_environment(
         os.makedirs(env_dir, exist_ok=True)
         shutil.copy(prefix.path('renv.lock'), env_dir)
         shutil.copytree(prefix.path('renv'), os.path.join(env_dir, 'renv'))
-        
+
         cmd_output_b(
             _rscript_exec(), '--vanilla', '-e',
             f"""\