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namespacing
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Let's always call the security labels the same way:
SMACK: "Smack Label"
SELINUX: "SELinux Security Context"
And the low-level encapsulation is called "seclabel". Now let's hope we
stick to this vocabulary in future, too, and don't mix "label"s and
"security contexts" and so on wildly.
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/etc/os-release is expected for the case for booting a full system, and
need not be required for thin container execution.
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the API file systems, nothing else
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- As suggested, prefix argument variables with "arg_" how we do this
usually.
- As suggested, don't involve memory allocations when storing command
line arguments.
- Break --help text at 80 chars
- man: explain that this is about SELinux
- don't do unnecessary memory allocations when putting together mount
option string
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This patch adds to new options:
-Z PROCESS_LABEL
This specifies the process label to run on processes run within the container.
-L FILE_LABEL
The file label to assign to memory file systems created within the container.
For example if you wanted to wrap an container with SELinux sandbox labels, you could execute a command line the following
chcon system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -R /srv/container
systemd-nspawn -L system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -Z system_u:system_r:svirt_lxc_net_t:s0:c0,c1 -D /srv/container /bin/sh
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Similar to PrivateNetwork=, PrivateTmp= introduce PrivateDevices= that
sets up a private /dev with only the API pseudo-devices like /dev/null,
/dev/zero, /dev/random, but not any physical devices in them.
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namespace
On kdbus user credentials are not translated across PID namespaces, but
simply invalidated if sender and receiver namespaces don't match. This
makes it impossible to properly authenticate requests from different PID
namespaces (which is probably a good thing). Hence, register the machine
in the parent and not the client and properly synchronize this.
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container to spawn
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If --link-journal=host or --link-journal=guest is used, this totally
cannot work and we exit with an error. If however --link-journal=auto
or --link-journal=no is used, just display a warning.
Having the same machine id can happen if booting from the same
filesystem as the host. Since other things mostly function correctly,
let's allow that.
https://bugs.freedesktop.org/show_bug.cgi?id=68369
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kdbus fortunately exposes the container's busses in the host fs, hence
we can access it directly instead of doing the namespacing dance.
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The only problem is that libgen.h #defines basename to point to it's
own broken implementation instead of the GNU one. This can be fixed
by #undefining basename.
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everywhere
We want to emphasize bus connections as per-thread communication
primitives, hence introduce a concept of a per-thread default bus, and
make use of it everywhere.
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bus_log_parse_error()
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Among other things this makes sure we always expose a --version command
and show it in the help texts.
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https://bugs.freedesktop.org/show_bug.cgi?id=68370
https://bugzilla.redhat.com/show_bug.cgi?id=988883
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Among other things this also adds a few things necessary for the change:
- Considerably more powerful error returning APIs in libsystemd-bus
- Adapter for connecting an sd_bus to an sd_event
- As I reworked the PolicyKit logic to the new library I also made it
asynchronous, so that PolicyKit requests of one user cannot block out
another user anymore.
- We always use the macro names for common bus error. That way it is
harder to mistype them since the compiler will notice
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We were already creating the file if it was missing, and this way
containers can reconfigure the file without running into problems.
This also makes resolv.conf handling more alike to handling of
/etc/localtime, which is also not a bind mount.
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Previously, if a file's bind mount destination didn't exist, nspawn
would blindly create a directory, and the subsequent bind mount would
fail. Examine the filetype of the source and ensure that, if the
destination does not exist, that it is created appropriately.
Also go one step further and ensure that the filetypes of the source
and destination match.
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Commit 2e996f4d4b642c5682c608c9692ad2ffae398ab2 added an include
of linux/netlink.h
This kernel header is not self contained in the linux 2.6 kernel
which breaks compilation with an unknown type sa_family_t
A workaround is to include linux/netlink.h after sys/socket.h
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Embedded folks don't need the machine registration stuff, hence it's
nice to make this optional. Also, I'd expect that machinectl will grow
additional commands quickly, for example to join existing containers and
suchlike, hence it's better keeping that separate from loginctl.
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Fixup for 9444b1f "logind: add infrastructure to keep track of
machines, and move to slices."
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- This changes all logind cgroup objects to use slice objects rather
than fixed croup locations.
- logind can now collect minimal information about running
VMs/containers. As fixed cgroup locations can no longer be used we
need an entity that keeps track of machine cgroups in whatever slice
they might be located. Since logind already keeps track of users,
sessions and seats this is a trivial addition.
- nspawn will now register with logind and pass various bits of metadata
along. A new option "--slice=" has been added to place the container
in a specific slice.
- loginctl gained commands to list, introspect and terminate machines.
- user.slice and machine.slice will now be pulled in by logind.service,
since only logind.service requires this slice.
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The audit subsystem isn't relevant when nspawn is only being used as a
chroot.
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This is a better fix than e13e1fad8b231e187bd5de3ce668411bdcd3ac1a for
failing to compile without audit that
77b6e19458f37cfde127ec6aa9494c0ac45ad890 introduced.
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the user what's going on
Let's try to be helpful to the user and give him a hint what he can do
to make nspawn work with normal OS containers.
https://bugzilla.redhat.com/show_bug.cgi?id=893751
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static hostname and if the static hostname is set, too
https://bugzilla.redhat.com/show_bug.cgi?id=957814
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https://bugs.freedesktop.org/show_bug.cgi?id=64014
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If we get as far as successfully starting the container, nspawn should
inherit the exit status of the child container process as its own.
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cg_get_machine_path is modified to include the escaped machine name
+ ".nspawn" if the machine argument is nonnull.
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