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Create ptmx as a device

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Hi,

I'm seeing an issue with udev and libvirt-lxc.  Libvirt-lxc creates
/dev/ptmx as a symlink to /dev/pts/ptmx.  When udev starts up, it
checks the device type, sees ptmx is 'not right', and replaces it
with a 'proper' ptmx.

In lxc, /dev/ptmx is bind-mounted from /dev/pts/ptmx instead of being
symlinked, so udev sees the right device type and leaves it alone.

A patch like the following seems to work for me.  Would there be
any objections to this?

>From 4c5035de52de7e06a0de9c5d0bab8c87a806cba7 Mon Sep 17 00:00:00 2001
From: Ubuntu <ubuntu@domU-12-31-39-14-F0-B3.compute-1.internal>
Date: Wed, 31 Aug 2011 18:15:54 +0000
Subject: [PATCH 1/1] make ptmx a bind mount rather than symlink

udev on some systems checks the device type of /dev/ptmx, and replaces it if
not as expected.  The symlink created by libvirt-lxc therefore gets replaced.
By creating it as a bind mount, the device type is correct and udev leaves it
alone.

Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
This commit is contained in:
Serge Hallyn 2011-08-31 13:18:33 -05:00 committed by Eric Blake
parent d4b9e06256
commit c1665ba872
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/lxc/lxc_container.c
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@ -543,18 +543,18 @@ static int lxcContainerPopulateDevices(void)
} }
} }
dev_t dev = makedev(LXC_DEV_MAJ_TTY, LXC_DEV_MIN_PTMX);
if (mknod("/dev/ptmx", S_IFCHR, dev) < 0 ||
chmod("/dev/ptmx", 0666)) {
virReportSystemError(errno, "%s",
_("Failed to make device /dev/ptmx"));
return -1;
}
if (access("/dev/pts/ptmx", W_OK) == 0) { if (access("/dev/pts/ptmx", W_OK) == 0) {
if (symlink("/dev/pts/ptmx", "/dev/ptmx") < 0) { if (mount("/dev/pts/ptmx", "/dev/ptmx", "ptmx", MS_BIND, NULL) < 0) {
virReportSystemError(errno, "%s", virReportSystemError(errno, "%s",
_("Failed to create symlink /dev/ptmx to /dev/pts/ptmx")); _("Failed to bind-mount /dev/ptmx to /dev/pts/ptmx"));
return -1;
}
} else {
dev_t dev = makedev(LXC_DEV_MAJ_TTY, LXC_DEV_MIN_PTMX);
if (mknod("/dev/ptmx", S_IFCHR, dev) < 0 ||
chmod("/dev/ptmx", 0666)) {
virReportSystemError(errno, "%s",
_("Failed to make device /dev/ptmx"));
return -1; return -1;
} }
} }