Wraps snakeoil's simple_unshare; returns to the previous namespaces on
context exit. Will be used by the next commit.
Signed-off-by: Matt Turner <matts...@gentoo.org>
---
catalyst/context.py | 32 ++++++++++++++++++++++++++++++++
catalyst/main.py | 17 +++++++----------
2 files changed, 39 insertions(+), 10 deletions(-)
create mode 100644 catalyst/context.py
diff --git a/catalyst/context.py b/catalyst/context.py
new file mode 100644
index 00000000..936b5c6b
--- /dev/null
+++ b/catalyst/context.py
@@ -0,0 +1,32 @@
+
+import contextlib
+import os
+
+from snakeoil.process.namespaces import setns, simple_unshare
+
+@contextlib.contextmanager
+def namespace(mount=False, uts=False, ipc=False, net=False, pid=False,
+ user=False, hostname=None):
+ namespaces = {
+ (mount, "mnt"): None,
+ (uts, "uts"): None,
+ (ipc, "ipc"): None,
+ (net, "net"): None,
+ (pid, "pid"): None,
+ (user, "user"): None,
+ }
+
+ # Save fds of current namespaces
+ for ns in [ns for ns in namespaces if ns[0]]:
+ fp = open(f"/proc/self/ns/{ns[1]}")
+ namespaces[ns] = fp
+
+ simple_unshare(mount=mount, uts=uts, ipc=ipc, net=net, pid=pid, user=user,
+ hostname=hostname)
+ try:
+ yield None
+ finally:
+ for ns in [ns for ns in namespaces if ns[0]]:
+ fp = namespaces[ns]
+ setns(fp.fileno(), 0)
+ fp.close()
diff --git a/catalyst/main.py b/catalyst/main.py
index 543895c6..93a4a0d3 100644
--- a/catalyst/main.py
+++ b/catalyst/main.py
@@ -7,14 +7,13 @@ import textwrap
import toml
-from snakeoil.process import namespaces
-
from DeComp.definitions import (COMPRESS_DEFINITIONS, DECOMPRESS_DEFINITIONS,
CONTENTS_DEFINITIONS)
from DeComp.contents import ContentsMap
from catalyst import log
import catalyst.config
+from catalyst.context import namespace
from catalyst.defaults import (confdefaults, option_messages,
DEFAULT_CONFIG_FILE, valid_config_file_values)
from catalyst.support import CatalystError
@@ -356,15 +355,13 @@ def _main(parser, opts):
# use pid & user namespaces, but snakeoil's namespace module has signal
# transfer issues (CTRL+C doesn't propagate), and user namespaces need
# more work due to Gentoo build process (uses sudo/root/portage).
- namespaces.simple_unshare(
- mount=True, uts=True, ipc=True, pid=False, net=False, user=False,
- hostname='catalyst')
+ with namespace(mount=True, uts=True, ipc=True, hostname='catalyst'):
+ # everything is setup, so the build is a go
+ try:
+ success = build_target(addlargs)
+ except KeyboardInterrupt:
+ log.critical('Catalyst build aborted due to user interrupt
(Ctrl-C)')
- # everything is setup, so the build is a go
- try:
- success = build_target(addlargs)
- except KeyboardInterrupt:
- log.critical('Catalyst build aborted due to user interrupt (Ctrl-C)')
if not success:
sys.exit(2)
sys.exit(0)
--
2.26.2
