[gentoo-catalyst] [PATCH] catalyst: create namespaces for building

[Mike Frysinger <vapier@gentoo.org>]

This helps isolate the catalyst builds from the rest of the system
and allows us to build as non-root user in more cases.

We don't support pid or user namespaces yet.
---
 catalyst/main.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/catalyst/main.py b/catalyst/main.py
index 51d2b04ab035..b8ae662dc76d 100644
--- a/catalyst/main.py
+++ b/catalyst/main.py
@@ -12,6 +12,7 @@ import os
 import sys
 
 from snakeoil import process
+from snakeoil.process import namespaces
 
 from DeComp.definitions import (COMPRESS_DEFINITIONS, DECOMPRESS_DEFINITIONS,
 	CONTENTS_DEFINITIONS)
@@ -421,6 +422,14 @@ def _main(parser, opts):
 		# catalyst cannot be run as a normal user due to chroots, mounts, etc
 		log.critical('This script requires root privileges to operate')
 
+	# Start off by creating unique namespaces to run in.  Would be nice to
+	# 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')
+
 	# everything is setup, so the build is a go
 	try:
 		success = build_target(addlargs)
-- 
2.12.0