From d83171b1fbbb809f7e5ed0daeed4435132817158 Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Tue, 29 Apr 2025 14:20:22 +0200
Subject: move the get_cgroup utility function into the library

---
 examples/cgroup.py          | 15 ++-------------
 linuxnamespaces/__init__.py | 11 +++++++++++
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/examples/cgroup.py b/examples/cgroup.py
index 34bf01b..2a423d3 100755
--- a/examples/cgroup.py
+++ b/examples/cgroup.py
@@ -18,19 +18,8 @@ import linuxnamespaces
 import linuxnamespaces.systemd
 
 
-def get_cgroup(pid: int = -1) -> pathlib.PurePath:
-    """Look up the cgroup that the given pid or the running process belongs
-    to.
-    """
-    return pathlib.PurePath(
-        pathlib.Path(
-            f"/proc/{pid}/cgroup" if pid > 0 else "/proc/self/cgroup"
-        ).read_text().split(":", 2)[2].strip()
-    )
-
-
 def main() -> None:
-    mycgroup = get_cgroup()
+    mycgroup = linuxnamespaces.get_cgroup()
     if not os.access(
         pathlib.Path("/sys/fs/cgroup") / mycgroup.relative_to("/"),
         os.W_OK,
@@ -45,7 +34,7 @@ def main() -> None:
                     properties={"Delegate": True},
                 ),
             )
-            mycgroup = get_cgroup()
+            mycgroup = linuxnamespaces.get_cgroup()
         except NotImplementedError:
             linuxnamespaces.systemd.reexec_as_transient_unit(
                 properties={"Delegate": True}
diff --git a/linuxnamespaces/__init__.py b/linuxnamespaces/__init__.py
index a2c7985..cd30498 100644
--- a/linuxnamespaces/__init__.py
+++ b/linuxnamespaces/__init__.py
@@ -367,6 +367,17 @@ def bind_mount(
         mount(srcloc, tgtloc, None, mflags)
 
 
+def get_cgroup(pid: int = -1) -> pathlib.PurePath:
+    """Look up the cgroup that the given pid or the current process belongs
+    to.
+    """
+    return pathlib.PurePath(
+        pathlib.Path(
+            f"/proc/{pid}/cgroup" if pid > 0 else "/proc/self/cgroup"
+        ).read_text().split(":", 2)[2].strip()
+    )
+
+
 _P = typing.ParamSpec("_P")
 
 class _ExceptionExitCallback:
-- 
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