Increase the soft limit for open file descriptorsjuerg/fuse-rlimit

SafeHardlinks FUSE needs to hold file descriptors for all processes in
the sandbox. Avoid hitting the limit too quickly by increasing the soft
limit to the maximum.

Fixes #232

1 files changed, 9 insertions, 0 deletions

diff --git a/buildstream/_frontend/main.py b/buildstream/_frontend/main.py
index fc5372048..1abbd3592 100644
--- a/buildstream/_frontend/main.py
+++ b/buildstream/_frontend/main.py
@@ -20,6 +20,7 @@
 import os
 import sys
 import click
+import resource
 from contextlib import contextmanager
 from blessings import Terminal
 from click import UsageError
@@ -778,6 +779,14 @@ class App():
         else:
             self.colors = False
 
+        # Increase the soft limit for open file descriptors to the maximum.
+        # SafeHardlinks FUSE needs to hold file descriptors for all processes in the sandbox.
+        # Avoid hitting the limit too quickly.
+        limits = resource.getrlimit(resource.RLIMIT_NOFILE)
+        if limits[0] != limits[1]:
+            # Set soft limit to hard limit
+            resource.setrlimit(resource.RLIMIT_NOFILE, (limits[1], limits[1]))
+
     #
     # Initialize the main pipeline
     #