populate_dev: also create std{in,out,err} symlinks

When booting systemd, it'll create these symlinks, but when doing an
application container, nothing does this and we risk creating regular
files there.

1 files changed, 5 insertions, 1 deletions

diff --git a/linuxnamespaces/__init__.py b/linuxnamespaces/__init__.py
index e305b4e..54a6883 100644
--- a/linuxnamespaces/__init__.py
+++ b/linuxnamespaces/__init__.py
@@ -368,7 +368,11 @@ def populate_dev(
     newdev = AtLocation(newroot) / "dev"
     directories = {"pts"}
     files = set()
-    symlinks = {}
+    symlinks = {
+        "stdin": "/proc/self/fd/0",
+        "stdout": "/proc/self/fd/1",
+        "stderr": "/proc/self/fd/2",
+    }
     bind_mounts: dict[str, AtLocation] = {}
     with contextlib.ExitStack() as exitstack:
         for fn in "null zero full random urandom tty".split():