Fixed #35308 -- Handled OSError when launching code formatters.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

5 files changed, 16 insertions, 10 deletions

diff --git a/django/core/management/commands/makemigrations.py b/django/core/management/commands/makemigrations.py
index d5d3466201..690d0e5053 100644
--- a/django/core/management/commands/makemigrations.py
+++ b/django/core/management/commands/makemigrations.py
@@ -392,7 +392,7 @@ class Command(BaseCommand):
                         )
                     )
                     self.log(writer.as_string())
-        run_formatters(self.written_files)
+        run_formatters(self.written_files, stderr=self.stderr)
 
     @staticmethod
     def get_relative_path(path):
@@ -499,7 +499,7 @@ class Command(BaseCommand):
                     # Write the merge migrations file to the disk
                     with open(writer.path, "w", encoding="utf-8") as fh:
                         fh.write(writer.as_string())
-                    run_formatters([writer.path])
+                    run_formatters([writer.path], stderr=self.stderr)
                     if self.verbosity > 0:
                         self.log("\nCreated new merge migration %s" % writer.path)
                         if self.scriptable:
diff --git a/django/core/management/commands/optimizemigration.py b/django/core/management/commands/optimizemigration.py
index 2064dfbf3c..90db2d2773 100644
--- a/django/core/management/commands/optimizemigration.py
+++ b/django/core/management/commands/optimizemigration.py
@@ -121,7 +121,7 @@ class Command(BaseCommand):
                     )
         with open(writer.path, "w", encoding="utf-8") as fh:
             fh.write(migration_file_string)
-        run_formatters([writer.path])
+        run_formatters([writer.path], stderr=self.stderr)
 
         if verbosity > 0:
             self.stdout.write(
diff --git a/django/core/management/commands/squashmigrations.py b/django/core/management/commands/squashmigrations.py
index 6b5ddeeba5..bb636116a5 100644
--- a/django/core/management/commands/squashmigrations.py
+++ b/django/core/management/commands/squashmigrations.py
@@ -221,7 +221,7 @@ class Command(BaseCommand):
             )
         with open(writer.path, "w", encoding="utf-8") as fh:
             fh.write(writer.as_string())
-        run_formatters([writer.path])
+        run_formatters([writer.path], stderr=self.stderr)
 
         if self.verbosity > 0:
             self.stdout.write(
diff --git a/django/core/management/templates.py b/django/core/management/templates.py
index 633eed781d..dbaea11200 100644
--- a/django/core/management/templates.py
+++ b/django/core/management/templates.py
@@ -229,7 +229,7 @@ class TemplateCommand(BaseCommand):
                 else:
                     shutil.rmtree(path_to_remove)
 
-        run_formatters([top_dir], **formatter_paths)
+        run_formatters([top_dir], **formatter_paths, stderr=self.stderr)
 
     def handle_template(self, template, subdir):
         """
diff --git a/django/core/management/utils.py b/django/core/management/utils.py
index fca61f2c23..6ca88fa71a 100644
--- a/django/core/management/utils.py
+++ b/django/core/management/utils.py
@@ -2,6 +2,8 @@ import fnmatch
 import os
 import shutil
 import subprocess
+import sys
+import traceback
 from pathlib import Path
 from subprocess import run
 
@@ -161,7 +163,7 @@ def find_formatters():
     return {"black_path": shutil.which("black")}
 
 
-def run_formatters(written_files, black_path=(sentinel := object())):
+def run_formatters(written_files, black_path=(sentinel := object()), stderr=sys.stderr):
     """
     Run the black formatter on the specified files.
     """
@@ -169,7 +171,11 @@ def run_formatters(written_files, black_path=(sentinel := object())):
     if black_path is sentinel:
         black_path = shutil.which("black")
     if black_path:
-        subprocess.run(
-            [black_path, "--fast", "--", *written_files],
-            capture_output=True,
-        )
+        try:
+            subprocess.run(
+                [black_path, "--fast", "--", *written_files],
+                capture_output=True,
+            )
+        except OSError:
+            stderr.write("Formatters failed to launch:")
+            traceback.print_exc(file=stderr)