relicense as GPL-2+HEADmain

The earlier GPL-3 only is implied in the new grant.

24 files changed, 24 insertions, 24 deletions

diff --git a/README.md b/README.md
index 9acba17..a290ca6 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,4 @@ To see these are composed, consider looking into the `examples/` directory.
 
 License
 -------
-GPL-3
+GPL-2+
diff --git a/examples/cgroup.py b/examples/cgroup.py
index 2a423d3..cd6f743 100755
--- a/examples/cgroup.py
+++ b/examples/cgroup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Unshare a cgroup (and user) namespace such that the entire cgroup hierarchy
 (inside the namespace) becomes writeable to the user.
diff --git a/examples/chhostname.py b/examples/chhostname.py
index bf174e6..de1ee42 100755
--- a/examples/chhostname.py
+++ b/examples/chhostname.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Unshare a UTS (and user and mount) namespace and change the hostname."""
 
diff --git a/examples/chrootfuse.py b/examples/chrootfuse.py
index d8ca965..0eeb5ce 100755
--- a/examples/chrootfuse.py
+++ b/examples/chrootfuse.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Mount a given filesystem image inside a user and mount namespace using
 an unprivileged fuse driver and chroot into the mounted filesystem. Supported
diff --git a/examples/chroottar.py b/examples/chroottar.py
index cf0f87e..095712a 100755
--- a/examples/chroottar.py
+++ b/examples/chroottar.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Extract a given tarball into a temporary location and chroot into it inside
 a user and mount namespace.
diff --git a/examples/fakeroot.py b/examples/fakeroot.py
index 47db330..9679bab 100755
--- a/examples/fakeroot.py
+++ b/examples/fakeroot.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Vaguely emulate fakeroot using a user namespace that maps the current user
 and group to root and the rest of the low range to a subuid range without
diff --git a/examples/netnsslirp.py b/examples/netnsslirp.py
index 7a1a27e..92f473b 100755
--- a/examples/netnsslirp.py
+++ b/examples/netnsslirp.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Construct a network namespace with a host0 interface backed by slirp4netns.
 """
diff --git a/examples/pidns.py b/examples/pidns.py
index d926d87..0ef049e 100755
--- a/examples/pidns.py
+++ b/examples/pidns.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Create a pid namespace and provide a matching /proc view. As a consequence,
 user and mount namespaces will be unshared as well.
diff --git a/examples/unschroot_fs.py b/examples/unschroot_fs.py
index d1953bc..b29ecc5 100755
--- a/examples/unschroot_fs.py
+++ b/examples/unschroot_fs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Emulate schroot using namespaces sufficiently well that sbuild can deal with
 it but not any better. It assumes that ~/.cache/sbuild contains tars suitable
diff --git a/examples/unschroot_proc.py b/examples/unschroot_proc.py
index 31cb1e8..f5a444f 100755
--- a/examples/unschroot_proc.py
+++ b/examples/unschroot_proc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2025 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Emulate schroot using namespaces and a background session process
 sufficiently well that sbuild can deal with it but not any better. For using
diff --git a/examples/userchroot.py b/examples/userchroot.py
index 4006dc6..cbb827a 100755
--- a/examples/userchroot.py
+++ b/examples/userchroot.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Perform something like an unprivileged chroot via a user and mount
 namespace. This is similar to "unshare --map-auto --mount-proc --root=$1", but
diff --git a/examples/withallsubuids.py b/examples/withallsubuids.py
index c247002..32ff2f6 100755
--- a/examples/withallsubuids.py
+++ b/examples/withallsubuids.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Map all available ranges from /etc/subuid and /etc/subgid as identity and
 run a given command with all capabilities (including CAP_DAC_OVERRIDE)
diff --git a/linuxnamespaces/__init__.py b/linuxnamespaces/__init__.py
index 83358b6..ccf3314 100644
--- a/linuxnamespaces/__init__.py
+++ b/linuxnamespaces/__init__.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Provide plumbing-layer functionality for working with Linux namespaces in
 Python.
diff --git a/linuxnamespaces/atlocation.py b/linuxnamespaces/atlocation.py
index 46ac541..1e719a1 100644
--- a/linuxnamespaces/atlocation.py
+++ b/linuxnamespaces/atlocation.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Describe a location in the filesystem by a combination of a file descriptor
 and a file name each of which can be optional. Many Linux system calls are able
diff --git a/linuxnamespaces/filedescriptor.py b/linuxnamespaces/filedescriptor.py
index ee96a94..f159a83 100644
--- a/linuxnamespaces/filedescriptor.py
+++ b/linuxnamespaces/filedescriptor.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """A type tag for integers that represent file descriptors."""
 
diff --git a/linuxnamespaces/idmap.py b/linuxnamespaces/idmap.py
index 8f33d70..315198a 100644
--- a/linuxnamespaces/idmap.py
+++ b/linuxnamespaces/idmap.py
@@ -1,5 +1,5 @@
 # Copyright 2024-2025 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Provide functionalit related to mapping user and group ids in a user
 namespace.
diff --git a/linuxnamespaces/syscalls.py b/linuxnamespaces/syscalls.py
index e9b0e44..86b21e3 100644
--- a/linuxnamespaces/syscalls.py
+++ b/linuxnamespaces/syscalls.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Provide typed Python functions for a number of Linux system calls relevant
 for Linux namespaces including the new mount API.
diff --git a/linuxnamespaces/systemd/__init__.py b/linuxnamespaces/systemd/__init__.py
index 84cb135..ff09d00 100644
--- a/linuxnamespaces/systemd/__init__.py
+++ b/linuxnamespaces/systemd/__init__.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Communicate with a systemd instance to create e.g. delegated croups."""
 
diff --git a/linuxnamespaces/systemd/dbussy.py b/linuxnamespaces/systemd/dbussy.py
index 60b74fc..e38a119 100644
--- a/linuxnamespaces/systemd/dbussy.py
+++ b/linuxnamespaces/systemd/dbussy.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Communicate with a systemd instance via dbus using dbussy."""
 
diff --git a/linuxnamespaces/systemd/jeepney.py b/linuxnamespaces/systemd/jeepney.py
index ef276d3..16fbca1 100644
--- a/linuxnamespaces/systemd/jeepney.py
+++ b/linuxnamespaces/systemd/jeepney.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Communicate with a systemd instance via dbus using jeepney."""
 
diff --git a/linuxnamespaces/tarutils.py b/linuxnamespaces/tarutils.py
index 5ad60cd..9569939 100644
--- a/linuxnamespaces/tarutils.py
+++ b/linuxnamespaces/tarutils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 """Extensions to the tarfile module.
  * ZstdTarFile extends TarFile to deal with zstd-compressed archives.
diff --git a/pyproject.toml b/pyproject.toml
index 9e90387..fbd5218 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ description = "typed syscall wrappers and plumbing for working with Linux namesp
 authors = [{name = "Helmut Grohne", email = "helmut@subdivi.de"}]
 classifiers = [
   "Development Status :: 3 - Alpha",
-  "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+  "License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)",
   "Operating System :: POSIX :: Linux",
   "Typing :: Typed",
   "Programming Language :: Python :: 3",
diff --git a/tests/test_atlocation.py b/tests/test_atlocation.py
index b107975..16a4d53 100644
--- a/tests/test_atlocation.py
+++ b/tests/test_atlocation.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 import contextlib
 import functools
diff --git a/tests/test_simple.py b/tests/test_simple.py
index 114b922..5c9d2d3 100644
--- a/tests/test_simple.py
+++ b/tests/test_simple.py
@@ -1,5 +1,5 @@
 # Copyright 2024 Helmut Grohne <helmut@subdivi.de>
-# SPDX-License-Identifier: GPL-3
+# SPDX-License-Identifier: GPL-2+
 
 import asyncio
 import errno