[gentoo-catalyst] [PATCH 2/2] catalyst: create namespaces for building

[Mike Frysinger]

This helps isolate the catalyst builds from the rest of the system
and allows us to build as non-root user in more cases.  This might
not work everywhere, but it's a start (snapshot generation works).
---
 catalyst/main.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/catalyst/main.py b/catalyst/main.py
index 65e1431..f984653 100644
--- a/catalyst/main.py
+++ b/catalyst/main.py
@@ -10,6 +10,8 @@ import argparse
 import os
 import sys
 
+from snakeoil.process import namespaces
+
 __selfpath__ = os.path.abspath(os.path.dirname(__file__))
 
 from DeComp.definitions import (COMPRESS_DEFINITIONS, DECOMPRESS_DEFINITIONS,
@@ -336,6 +338,13 @@ def main():
 	if "target" not in addlargs:
 		raise CatalystError("Required value \"target\" not specified.")
 
+	# Start off by creating unique namespaces to run in.
+	namespaces.simple_unshare(
+		mount=True, uts=True, ipc=True, pid=True, net=False, user=True,
+		hostname='catalyst')
+
+	# We should be root now, either a real root, or in a userns as root.
+	# If we aren't, then we've failed, and need to abort.
 	if os.getuid() != 0:
 		# catalyst cannot be run as a normal user due to chroots, mounts, etc
 		print "!!! catalyst: This script requires root privileges to operate"
-- 
2.5.2