view toys/unshare.c @ 543:60b97ba66a70

Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
author Rob Landley <rob@landley.net>
date Mon, 12 Mar 2012 23:00:28 -0500
parents f70187762108
children 99cb6ad605ee
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/* vi: set sw=4 ts=4:
 *
 * unshare.c - run command in new context
 *
 * Copyright 2011 Rob Landley <rob@landley.net>
 *
 * Not in SUSv4.

USE_UNSHARE(NEWTOY(unshare, "<1^nium", TOYFLAG_USR|TOYFLAG_BIN))

config UNSHARE
	bool "unshare"
	default y
	depends on TOYBOX_CONTAINER
	help
	  usage: unshare [-muin] COMMAND...

	  Create new namespace(s) for this process and its children, so some
	  attribute is not shared with the parent process.  This is part of
	  Linux Containers.  Each process can have its own:

	  -m	Mount/unmount tree
	  -u	Host and domain names
	  -i	SysV IPC (message queues, semaphores, shared memory)
	  -n	Network address, sockets, routing, iptables
*/

#include "toys.h"
#include <linux/sched.h>

void unshare_main(void)
{
	unsigned flags[]={CLONE_NEWNS, CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWNET,0};
	unsigned f=0;
	int i;

	for (i=0; flags[i]; i++)
		if (toys.optflags & (1<<i))
			f |= flags[i];

	if(unshare(f)) perror_exit("failed");

	xexec(toys.optargs);
}