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This remove the need for various header files to include the
(relatively heavyweight) util.h.
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There were two callers, one can use strtod_l() and the other strptime_l().
(David: fix up commit-msg and coding-style)
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This adds three kinds of file system locks for container images:
a) a file system lock next to the actual image, in a .lck file in the
same directory the image is located. This lock has the benefit of
usually being located on the same NFS share as the image itself, and
thus allows locking container images across NFS shares.
b) a file system lock in /run, named after st_dev and st_ino of the
root of the image. This lock has the advantage that it is unique even
if the same image is bind mounted to two different places at the same
time, as the ino/dev stays constant for them.
c) a file system lock that is only taken when a new disk image is about
to be created, that ensures that checking whether the name is already
used across the search path, and actually placing the image is not
interrupted by other code taking the name.
a + b are read-write locks. When a container is booted in read-only mode
a read lock is taken, otherwise a write lock.
Lock b is always taken after a, to avoid ABBA problems.
Lock c is mostly relevant when renaming or cloning images.
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"read-only" concept for raw disk images, too
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Unlike some client code suggests...
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This fixes parsing of options in shared/generator.c. Existing code
had some issues:
- it would treate whitespace and semicolons as seperators. fstab(5)
is pretty clear that only commas matter. And the syntax does
not allow for spaces to be inserted in the field in fstab.
Whitespace might be escaped, but then it should not seperate
options. Treat whitespace and semicolons as any other character.
- it assumed that x-systemd.device-timeout would always be followed
by "=". But this is not guaranteed, hasmntopt will return this
option even if there's no value. Uninitialized memory could be read.
- some error paths would log, and inconsistently, some would just
return an error code.
Filtering is split out to a separate function and tests are added.
Similar code paths in other places are adjusted to use the new function.
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Sometimes it is necessary to stop a generator from running. Either
because of a bug, or for testing, or some other reason. The only way
to do that would be to rename or chmod the generator binary, which is
inconvenient and does not survive upgrades. Allow masking and
overriding generators similarly to units and other configuration
files.
For the systemd instance, masking would be more common, rather than
overriding generators. For the user instances, it may also be useful
for users to have generators in $XDG_CONFIG_HOME to augment or
override system-wide generators.
Directories are searched according to the usual scheme (/usr/lib,
/usr/local/lib, /run, /etc), and files with the same name in higher
priority directories override files with the same name in lower
priority directories. Empty files and links to /dev/null mask a given
name.
https://bugs.freedesktop.org/show_bug.cgi?id=87230
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Remove the optional sepearate opening of the directory,
it would be just too complicated with the change to
multiple directories.
Move the middle of execute_directory() to a seperate
function to make it easier to grok.
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When there are a lot of split out journal files, we might run out of fds
quicker then we want. Hence: bump RLIMIT_NOFILE to 16K if possible.
Do these even for journalctl. On Fedora the soft RLIMIT_NOFILE is at 1K,
the hard at 4K by default for normal user processes, this code hence
bumps this up for users to 4K.
https://bugzilla.redhat.com/show_bug.cgi?id=1179980
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btrfs' COW logic results in heavily fragment journal files, which is
detrimental for perfomance. Hence, turn off COW for journal files as we
create them.
Turning off COW comes at the cost of data integrity guarantees, but this
should be acceptable, given that we do our own checksumming, and
generally have a pretty conservative write pattern.
Also see discussion on linux-btrfs:
http://www.spinics.net/lists/linux-btrfs/msg41001.html
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With this change it is possible to send file descriptors to PID 1, via
sd_pid_notify_with_fds() which PID 1 will store individually for each
service, and pass via the usual fd passing logic on next invocation.
This is useful for enable daemon reload schemes where daemons serialize
their state to /run, push their fds into PID 1 and terminate, restoring
their state on next start from the data in /run and passed in from PID
1.
The fds are kept by PID 1 as long as no POLLHUP or POLLERR is seen on
them, and the service they belong to are either not dead or failed, or
have a job queued.
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subvolumes
We make use of the btrfs subvol crtime for this, and for gpt images of a
manually managed xattr, if we can.
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There is alot of cleanup that will have to happen to turn on
-fstrict-aliasing, but I think our code should be "correct" to the rule.
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on a pty and returns the pty master fd to the client
This is a one-stop solution for "machinectl login", and should simplify
getting logins in containers.
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For that, ask machined for a container PTY and use that.
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hidden_file() is a bit more precise, since dot files usually shouldn't
be ignored, but certainly be considered hidden.
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This adds a new bus call to machined that enumerates /var/lib/container
and returns all trees stored in it, distuingishing three types:
- GPT disk images, which are files suffixed with ".gpt"
- directory trees
- btrfs subvolumes
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containers and install them locally
This adds a simply but powerful tool for downloading container images
from the most popular container solution used today. Use it like
this:
# systemd-import pull-dck mattdm/fedora
# systemd-nspawn -M fedora
This will donwload the layers for "mattdm/fedora", and make them
available locally as /var/lib/container/fedora.
The tool is pretty complete, as long as it's only about pulling down
images, or updating them. Pushing or searching is not supported yet.
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system of the OS
This works now:
# systemd-nspawn -xb -D / -M foobar
Which boots up an ephemeral container, based on the host's root file
system. Or in other words: you can now run the very same host OS you
booted your system with also in a container, on top of it, without
having it interfere. Great for testing whether the init system you are
hacking on still boots without reboot the system!
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resulting name is actually valid
Also, rename filename_is_safe() to filename_is_valid(), since it
actually does a full validation for what the kernel will accept as file
name, it's not just a heuristic.
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loop_write() didn't follow the usual systemd rules and returned status
partially in errno and required extensive checks from callers. Some of
the callers dealt with this properly, but many did not, treating
partial writes as successful. Simplify things by conforming to usual rules.
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Let's add some syntactic sugar for iterating through inotify events, and
use it everywhere.
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As kdbus no longer exports this, remove all traces from sd-bus too
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machine-id
If /etc was read only at boot time with an empty /etc/machine-id, the latter
will be mounted as a tmpfs and get reset at each boot. If the system becomes rw
later, this functionality enables to commit in a race-free manner the
transient machine-id to disk.
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https://bugs.debian/org/771397
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On the contrary of env, the added function returns all characters
cescaped, because it improves reproducibility.
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/proc/[pid]/cwd and /proc/[pid]/root are symliks to corresponding
directories
The added functions returns values of that symlinks.
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Reads the basename of the target of a symlink.
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it static
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Imagine a constructor like this:
int object_new(void **out) {
void *my_object;
int r;
...
r = ioctl(...);
if (r < 0)
return -errno;
...
*out = my_object;
return 0;
}
We have a lot of those in systemd. If you now call those, gcc might inline
the call and optimize it. However, gcc cannot know that "errno" is
negative if "r" is. Therefore, a caller like this will produce warnings:
r = object_new(&obj);
if (r < 0)
return r;
obj->xyz = "foobar";
In case the ioctl in the constructor fails, gcc might assume "errno" is 0
and thus the error-handling is not triggered. Therefore, "obj" is
uninitialized, but accessed. Gcc will warn about that.
The new negative_errno() helper can be used to mitigate those warnings.
The helper is guaranteed to return a negative integer. Furthermore, it
spills out runtime warnings if "errno" is non-negative.
Instead of returning "-errno", you can use:
return negative_errno();
gcc will no longer assume that this can return >=0, thus, it will not warn
about it.
Use this new helper in libsystemd-terminal to fix some grdev-drm warnings.
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Two's logarithms for unsigned.
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Function queries system hostname and applies changes only when necessary. Also,
migrate all client of sethostname to sethostname_idempotent while at it.
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Lets not unnecessarily rely on __WORDSIZE, which is not clearly specified
by any spec. Use explicit size comparisons if we're not interested in the
WORDSIZE, anyway.
(David: adjust commit message to explain why we do this)
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The alloca_align() helper is the alloca() equivalent of posix_memalign().
As there is no such function provided by glibc, we simply account for
additional memory and return a pointer offset into the allocated memory to
grant the alignment.
Furthermore, alloca0_align() is added, which simply clears the allocated
memory.
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It was mostly a duplicate of free_and_strdup().
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This is a useful helper, make it global. It will be required for
libsystemd-terminal, at minimum.
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If we invoke agents, we should make sure we actually can kill them
again. I mean, it's probably not our job to cleanup the signals if our
tools are invoked in weird contexts, but at least we should make sure,
that the subprocesses we invoke and intend to control work as intended.
Also see:
http://lists.freedesktop.org/archives/systemd-devel/2014-August/022460.html
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When this system-wide start-up timeout is hit we execute one of the
failure actions already implemented for services that fail.
This should not only be useful on embedded devices, but also on laptops
which have the power-button reachable when the lid is closed. This
devices, when in a backpack might get powered on by accident due to the
easily reachable power button. We want to make sure that the system
turns itself off if it starts up due this after a while.
When the system manages to fully start-up logind will suspend the
machine by default if the lid is closed. However, in some cases we don't
even get as far as logind, and the boot hangs much earlier, for example
because we ask for a LUKS password that nobody ever enters.
Yeah, this is a real-life problem on my Yoga 13, which has one of those
easily accessible power buttons, even if the device is closed.
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