From 42c659f30f8d13bc5b6bcbe9203e83a9efa2b2a8 Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Sun, 16 Jun 2024 16:46:43 +0200
Subject: populate_dev: also provide /dev/shm

This is needed e.g. for Python's multiprocessing.SemLock.
---
 linuxnamespaces/__init__.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/linuxnamespaces/__init__.py b/linuxnamespaces/__init__.py
index 43c1bc8..1b4ca07 100644
--- a/linuxnamespaces/__init__.py
+++ b/linuxnamespaces/__init__.py
@@ -407,7 +407,7 @@ def populate_dev(
     """
     origdev = AtLocation(origroot) / "dev"
     newdev = AtLocation(newroot) / "dev"
-    directories = {"pts"}
+    directories = {"pts", "shm"}
     files = set()
     symlinks = {
         "fd": "/proc/self/fd",
@@ -456,6 +456,12 @@ def populate_dev(
         for fn in directories:
             (newdev / fn).mkdir()
             (newdev / fn).chmod(0o755)
+        mount(
+            "tmpfs",
+            newdev / "shm",
+            "tmpfs",
+            MountFlags.NOSUID | MountFlags.NODEV,
+        )
         for fn in files:
             (newdev / fn).mknod(stat.S_IFREG)
         for fn, target in symlinks.items():
-- 
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