lxc-init used to be under /usr/lib/lxc. Now it is under
/usr/lib/<multiarch>/lxc, but old containers will still have it under
/usr/lib/lxc. So search for a valid lxc-init to run.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
lxc-ubuntu-cloud: extract the right filenames from tarball
Signed-off-by: Ben Howard <ben.howard@canonical.com> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Description: Fix handling of user-data in ubuntu-cloud template
Signed-off-by: Ben Howard <ben.howard@canonical.com> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
templates: use relative paths when creating containers
At the same time, allow lxc.mount.entry to specify an absolute target
path relative to /var/lib/lxc/CN/rootfs, even if rootfs is a blockdev.
Otherwise all such entries are ignored for blockdev-backed containers.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This patch introduces support for 4 hooks. We'd like to have 6 in
all to mirror the openvz ones (thanks to Stéphane for this info):
pre-start: in the host namespace before container mounting happens
mount: after container mounting (as per config and /var/lib/lxc/container/fstab)
but before pivot_root
start: immediately before exec'ing init
stop: in container namespace and in chroot before shutdown
umount: after other unmounting has happened
post-stop: outside of the container
stop and umount are not implemented here because when the kernel kills
the container init, it kills the namespace. We can probably work around
this, i.e. by keeping the /proc/pid/ns/mnt open, and using that, though
all container tasks including init would still be dead. Is that worth
pursuing?
start also presents a bit of an issue. openvz allows a script on the
host to be specified, apparently. My patch requires the script or
program to exist in the container. I'm fine with trying to do it the
openvz way, but I wasn't sure what the best way to do that was. Openvz
(I'm told) opens the script and passes its contents to a bash in the
container. But that limits the hooks to being only scripts. By
requiring the hook to be in the container, we can allow any sort of
hook, and assume that any required libraries/dependencies exist
there.
This could be done as generic 'lsm_init()' and 'lsm_load()' functions,
however that would make it impossible to compile one package supporting
more than one lsm. If we explicitly add the selinux, smack, and aa
hooks in the source, then one package can be built to support multiple
kernels.
The smack support should be pretty trivial, and probably very close
to the apparmor support.
The selinux support may require more, including labeling the passed-in
fds (consoles etc) and filesystems.
If someone on the list has the inclination and experience to add selinux
support, please let me know. Otherwise, I'll do Smack and SELinux.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
It optionally waits (an optional timeout # of seconds) for the container to
be STOPPED. If given -r, it reboots the container (and exits immediately).
I decided to add the timeout after all because it's harder to finagle into
an upstart post-stop script than a full bash script.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
lxc-ubuntu-cloud.in: re-enable use of daily cloud images
There are two types of cloud images - released and daily ones. We were
always using daily ones, instead of using released by default with an
option for daily. Fix that.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
lxc-ubuntu.in: fix up the logic adding group for bound users
1. 'getent group $user' assumes user's group is named $user.
2. if 'getent group' returns error, just ignore the group in container
3. (misc) while it happens to all work out fine anyway, don't do
getent passwd $bindhome if $bindhome isn't defined. (it will
successfully return all password entries)
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
When creating a container as lvm snapshot, use the original size unless
user explicitly overrides it.
It's all well and good to day "use lvextend if you run out of space", but
in the meantime applications may become corrupted...
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
ubuntu template: add sudo group and cleanup minor devttydir issue
Always add the user to the 'sudo' group as it's been around
since at least Ubuntu 10.04. In addition make the user part
of the admin group until 12.04 where it's been removed.
Also fix a minor layout issue with devttydir.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Daniel Baumann [Tue, 31 Jul 2012 14:01:24 +0000 (16:01 +0200)]
fix netstat script with separator
Allow to use -- as seperator in lxc-netstat, otherwise -n from lxc-netstat
collides with netstats -n option (Closes: #641251).
[Serge Hallyn] update patch to (1) not demand argument for
exec (breaks) and (2) set $name not $lxc_name.
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
make help consistent for other scripts
Display help information in a consistent format.
Print error messages and help information to stderr. Prefix error
messages with the name of the script (for easier debugging as part
of larger scripts).
Allow help information to be printed as a non-root user.
Fix file mode for lxc-checkconfig.in.
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
rewrite lxc-ps
Use bash instead of perl; eliminates final lxc dependency on perl
(beneficial for minimal operating system environments).
Modify the cgroup search to only use hierarchies that contain one
or more subsystems. When searching, if a hierarchy contains the
'ns' subsystem, do not append '/lxc' to the parent cgroup.
Maintain column spacing. Expand container name column as necessary.
Properly handle spaces in 'ps' output that are not field separators
(for example, try 'lxc-ps -o pid,args').
Fix file mode in repository.
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
refresh lxc-netstat
Modify the cgroup search to only use hierarchies that contain one
or more subsystems. When searching, if a hierarchy contains the
'ns' subsystem, do not append '/lxc' to the parent cgroup.
Change method of bind mounting /proc/<pid>/net onto /proc/net, to
avoid error "cannot mount block device /proc/<pid>/net read-only".
Check that user is root. Check that container name is specified
before calling 'exec'.
Update the help information.
Print error messages and help information to stderr.
Make indentation consistent.
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
refresh lxc-ls
Add an '--active' option that lists active containers by searching
cgroups. (Otherwise, the directories in /var/lib/lxc are listed.)
Modify the cgroup search to only use hierarchies that contain one
or more subsystems. When searching, if a hierarchy contains the
'ns' subsystem, do not append '/lxc' to the parent cgroup.
Add a '--help' option that prints the command syntax.
Print error messages and help information to stderr.
Update the documentation.
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
cgroup: only touch hierarchies that are bound to subsystems
Obtain a list of subsystems from /proc/cgroups, and ignore hierarchies
that are not bound to any of them (especially the 'systemd' hierarchy:
http://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups ).
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
lxc-attach: unify code for attaching a pid to a cgroup
To attach a new pid to the cgroups for an existing container, we can use
the same method that we did when we started the container: iterate over
all the mounted cgroup hierarchies; find the cgroup that pid 1 is in for
each hierarchy; add 'lxc/<name>' to the end of it; then write the pid to
the 'tasks' file in that cgroup. (The only difference is that we do not
create the cgroup again.) Note that we follow exactly the same iteration
pattern to delete our cgroups when a container is shutdown.
There may be situations where additional cgroups hierarchies are mounted
after the container is started, or the cgroup for pid 1 gets reassigned.
But we currently don't handle any of these cases in the shutdown code or
anywhere else, so it doesn't make sense to try to handle these cases for
lxc-attach by itself. Aside from simplifying the code, this change makes
it easier to solve a different problem: ignoring hierarchies that are
not bound to any subsystems (like 'systemd').
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
utmp: support non-rootfs configuration
Having a rootfs is not a necessary condition for monitoring utmp, since
/var or /var/run can just be remounted inside the container instead. We
should rely on the other two conditions already in place to decide
whether to monitor the utmp file:
- the container was started with 'lxc-start', which indicates that it
has a real init process and is expected to write to a utmp file
- support for CAP_SYS_BOOT was not found in the kernel, which would
otherwise supersede utmp monitoring
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
utmp: do not set conf->need_utmp_watch if CAP_SYS_BOOT is not found
If CAP_SYS_BOOT is not found in the kernel, the existing value for
conf->need_utmp_watch should be left intact (which will be '1' for
containers started with 'lxc-start', or '0' for containers started
with 'lxc-execute').
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
David Ward [Thu, 3 May 2012 22:50:15 +0000 (00:50 +0200)]
lxc-attach: use execvp instead of execve
execvp does not require specifying the full path to the executable
(e.g., "ls" instead of "/bin/ls"), making the operation of 'lxc-attach'
consistent with 'lxc-start' and 'lxc-execute'.
Signed-off-by: David Ward <david.ward@ll.mit.edu> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Sun, 18 Mar 2012 23:31:40 +0000 (00:31 +0100)]
ubuntu templates cleanups
1. fix inconsistent use of '--auth-key' (not --auth_key) which broke their
usage
2. add --debug option to lxc-ubuntu (which does set -x to show what broke)
(idea from Idea from lifeless and benji)
3. fix incorrect assumption about group with -b option. User's default group
may not be the same as username. Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Sun, 18 Mar 2012 23:31:40 +0000 (00:31 +0100)]
do check for utmp checking at the right time
We were doing the check for whether we need to watch utmp from a
thread cloned from that which will actually do the utmp watching.
As a result, the utmp file was always being watched, even if it
didn't need to be.
Serge Hallyn [Mon, 5 Mar 2012 22:53:14 +0000 (23:53 +0100)]
cgroups: fix broken support for deprecated ns cgroup
when using ns cgroup, use /cgroup/<init-cgroup> rather than
/cgroup/<init-cgroup>/lxc
At least lxc-start, lxc-stop, lxc-cgroup, lxc-console and lxc-ls work
with this patch. I've tested this in a 2.6.35 kernel with ns cgroup,
and in a 3.2 kernel without ns cgroup.
Note also that because of the check for container reboot support,
if we're using the ns cgroup we now end up with a /cgroup/<container>/2
cgroup created, empty, by the clone(CLONE_NEWPID). I'm really not
sure how much time we want to spend cleaning such things up since
ns cgroup is deprecated in kernel.
Signed-off-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Thu, 16 Feb 2012 20:14:13 +0000 (14:14 -0600)]
update ubuntu templates to provide macaddr and more
Add a macaddr if precisely one veth is specified but no hwaddr. Allow
specifying ssh authkeys. In cloud template, copy locales by default and allow
a tarball to be specified.
Signed-off-by: Ben Howard <ben.howard@canonical.com> Signed-off-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Thu, 16 Feb 2012 20:13:26 +0000 (14:13 -0600)]
lxc-ubuntu: fix obscure arguments
1. --path is meant to be passed by lxc-create, but should not be passed
in by users. Don't advertise it in --help.
2. --clean syntax ends up not making much sense. Get rid of it, and
add '--flush-cache' option instead.
Signed-off-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Thu, 16 Feb 2012 20:01:20 +0000 (14:01 -0600)]
ubuntu template changes
Author: Stéphane Graber <stgraber@ubuntu.com>
Use ubuntu/ubuntu instead of root/root by default. Stop
removing tty[56].conf in Precise. Stop messing with dhclient.conf.
Set devttydir on Precise to /dev/lxc to allow for clean upgrades.
Serge Hallyn [Tue, 7 Feb 2012 15:08:37 +0000 (09:08 -0600)]
if lxc-init can't mount /dev/shm, don't fail.
The 'lxc-init' (a lightweight init process used by lxc-execute in place of
upstart etc) tries to mount /dev/shm during startup. If that fails (for
instance /dev/shm does not exist) then it aborts execution and returns -1. This
is unreasonable as very few applications actually need /dev/shm.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Tue, 7 Feb 2012 15:01:41 +0000 (09:01 -0600)]
Don't raise error if container didn't sys_reboot
Don't call it an error if a container exits without calling sys_reboot.
Particularly since that will almost always be the case with lxc-execute.
This fixes a regression introduced in commit
"49296e2ebfe7c5f9d6ebafbb54f5c5e56a0cc085: support proper container
reboot"
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Fri, 3 Feb 2012 15:29:14 +0000 (09:29 -0600)]
lxc-ubuntu: Support for building a container of a foreign architecture
Support building a container of a foreign architecture if
qemu-user-static is installed. This is done by installing some packages
of the host architecture in the container using multi-arch.
Serge Hallyn [Thu, 2 Feb 2012 21:48:17 +0000 (15:48 -0600)]
fix lxc-netstat for nested cgroups
Use the correct path for the container's cgroup task file.
Also exit out early and cleanly if the container is not running,
and bind-mount /proc/$pid/net with '-n' to keep the entry out
of mtab, else the mtab entry will never go away.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Wed, 25 Jan 2012 04:05:28 +0000 (22:05 -0600)]
support proper container reboot
This patch looks for Daniel's kernel patch allowing the lxc monitor
to tell container reboot from shutdown based on the exit signal. If
that patch is not there, utmp monitoring is used. Otherwise, it only
looks for the signal. Note that the 'conf->need_utmp_watch' is
technically not necessary, as there is no harm in watching the utmp
file.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Mon, 23 Jan 2012 19:25:11 +0000 (13:25 -0600)]
add lvm support to lxc-create
1. Some templates copy the cached pristine rootfs using 'cp a b' where b is
$lxc_path/$name/rootfs. That doesn't do the right thing if rootfs already
exists, as it will when it is an lvm or other mount. So switch to
'rsync a/ b/'. (cp can be made to work too of course).
2. Update lxc-create to support backing stores. For now only lvm is
implemented.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Mon, 23 Jan 2012 18:07:44 +0000 (12:07 -0600)]
Support nested cgroups
With this patch, I can start a container 'o1' inside another container 'o1'.
(Of course, the containers must be on a different subnet)
Detail:
1. Create cgroups for containers under /lxc.
2. Support nested lxc: respect init's cgroup:
Create cgroups under init's cgroup. So if we start a container c2
inside a container 'c1', we'll use /sys/fs/cgroup/freezer/lxc/c1/lxc/c2
instead of /sys/fs/cgroup/freezer/c2. This allows a container c1
to be created inside container c1 It also allow a container's limits
to be enforced on all a container's children (which a MAC policy could
already enforce, in which case current lxc code would be unable to nest
altogether).
3. Finally, if a container's cgroup already exists, rename it rather than
failing to start the container. Try to WARN the user so they might go
clean the old cgroup up.
Whereas without this patch, container o1's cgroup would be
/sys/fs/cgroup/<subsys>/o1,
it now becomes
/sys/fs/cgroup/<subsys>/<initcgroup>/lxc/o1
so if init is in cgroup '/' then o1's freezer cgroup would be:
/sys/fs/cgroup/freezer/lxc/o1
Changelog:
. make lxc-ps work with separate mtab. If cgroups were mounted with -n,
and mtab is not linked to /proc/self/mounts, then 'mount -t cgroup' won't
show these mounts. So make lxc-ps not use it, but rather use
/proc/self/mounts directly.
. lxc-ls in the past assumed that a container's cgroup was just '/<name>'.
Now it is '/<host-init-cgroup>/lxc/<name>'. Handle that.
. first version of this patch was setting clone_children on
<path-to-cpusets-cgroup>/<init-cgroup>/lxc, not the parent of that dir.
That failed to initialize that cgroup, so tasks could not enter it.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Mon, 23 Jan 2012 18:05:40 +0000 (12:05 -0600)]
lxc-ubuntu: use release-updates and release-security
Particularly for LTS releases, which many people will want to use in
their containers, it is not wise to not use -security and -updates.
Furthermore the fix allowing ssh to allow the container to shut down
is in lucid-updates only.
With this patch, after debootstrapping a container, we add -updates
and -security to sources.list and do an apt-get upgrade under chroot.
Unfortunately we need to do this because debootstrap doesn't know how
to.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Serge Hallyn [Mon, 23 Jan 2012 17:57:59 +0000 (11:57 -0600)]
drop mac_admin and mac_override
mac_admin stops the container from loading LSM policy. Neither
selinux nor apparmor currently will do well with automatic namespacing
of policy (though it's coming in apparmor, after which we can re-enable
this).
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Kevin Cernekee [Sat, 25 Feb 2012 23:49:48 +0000 (00:49 +0100)]
Add MIPS as a supported architecture
The issue is similar to what was fixed in commit e7eb632c for ARM:
the "configure" script errors out because it is unable to set
LINUX_SRCARCH. Fix is to add MIPS to the list.
Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:14 +0000 (09:57 +0100)]
lxc-attach: Drop privileges when attaching to container unless requested otherwise
lxc-attach will now put the process that is attached to the container into
the correct cgroups corresponding to the container, set the correct
personality and drop the privileges.
The information is extracted from entries in /proc of the init process of
the container. Note that this relies on the (reasonable) assumption that the
init process does not in fact drop additional capabilities from its bounding
set.
Additionally, 2 command line options are added to lxc-attach: One to prevent
the capabilities from being dropped and the process from being put into the
cgroup (-e, --elevated-privileges) and a second one to explicitly state the
architecture which the process will see, (-a, --arch) which defaults to the
container's current architecture.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:14 +0000 (09:57 +0100)]
Move lxc_attach from namespace.c to attach.c and rename it to lxc_attach_to_ns
Since lxc-attach helper functions now have an own source file, lxc_attach is
moved from namespace.c to attach.c and is renamed to lxc_attach_to_ns,
because that better reflects what the function does (attaching to a
container can also contain the setting of the process's personality, adding
it to the corresponding cgroups and dropping specific capabilities).
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:14 +0000 (09:57 +0100)]
Add attach.[ch]: Helper functions for lxc-attach
The following helper functions for lxc-attach are added to a new file
attach.c:
- lxc_proc_get_context_info: Get cgroup memberships, personality and
capability bounding set from /proc for a given process.
- lxc_proc_free_context_info: Free the data structure responsible
- lxc_attach_proc_to_cgroups: Add the process specified by the pid
parameter to the cgroups given by the ctx parameter.
- lxc_attach_drop_privs: Drop capabilities to the capability mask given in
the ctx parameter.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:14 +0000 (09:57 +0100)]
Add lxc_config_parse_arch to parse architecture strings
Add the function lxc_config_parse_arch that parses an architecture string
(x86, i686, x86_64, amd64) and returns the corresponding personality. This
is required for lxc-attach, which accepts architectures independently of
lxc.arch. The parsing of lxc.arch now also uses the same function to ensure
consistency.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:14 +0000 (09:57 +0100)]
cgroup: Make cgroup_attach a public function
lxc-attach needs to be able to attach a process to specific cgroup, so
cgroup_attach is renamed to lxc_cgroup_attach and now also defined in the
header file.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:13 +0000 (09:57 +0100)]
Enable get_cgroup_mount to search for mount points satisfying multiple subsystems at once
lxc-attach functionality reads /proc/init_pid/cgroup to determine the cgroup
of the container for a given subsystem. However, since subsystems may be
mounted together, we want to be on the safe side and be sure that we really
find the correct mount point, so we allow get_cgroup_mount to check for
*all* the subsystems; the subsystem parameter may now be a comma-separated
list.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:13 +0000 (09:57 +0100)]
Accept numeric values for capabilities to drop
lxc.cap.drop now also accepts numeric values for capabilities. This allows
the user to specify capabilities LXC doesn't know about yet or capabilities
that were not part of the kernel headers LXC was compiled against.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Christian Seiler [Thu, 23 Feb 2012 08:57:13 +0000 (09:57 +0100)]
Add function to determine CAP_LAST_CAP of the current kernel dynamically
The function lxc_caps_last_cap() determines CAP_LAST_CAP of the current kernel
dynamically. It first tries to read /proc/sys/kernel/cap_last_cap. If that
fails, because the kernel does not support this interface yet, it loops
through all capabilities and tries to determine whether the current capability
is part of the bounding set. The first capability for which prctl() fails is
considered to be CAP_LAST_CAP.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
projects / thirdparty / lxc.git / log
