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This is useful for nspawn managers that want to learn when nspawn is
finished with initialiuzation, as well what the PID of the init system
in the container is.
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The lifetime of compound literals is bound to the local scope, we hence
cannot refernce them outside of it.
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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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This fixes a memory leak introduced by
1ed0c19f81fd13cdf283c6def0168ce122a853a9
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We initialize structs during declartion if possible
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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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Check string ops hashmap_put() for keys with a different pointer but the same
value.
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As suggested by Marcos Felipe Rasia de Mello <marcosfrm@gmail.com>.
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This does not make a difference, but the code was confusing.
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/proc/sys/net/ipv4/ip_forward
We need to turn on /proc/sys/net/ipv4/ip_forward before the
per-interface forwarding setting is useful, hence let's propagate the
per-interface setting once to the system-wide setting.
Due to the unclear ownership rules of that flag, and the fact that
turning it on also has effects on other sysctl flags we try to minimize
changes to the flag, and only turn it on once. There's no logic to
turning it off again, but this should be fairly unproblematic as the
per-interface setting defaults to off anyway.
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This introduces am AddressFamilyBoolean type that works more or less
like a booleaan, but can optionally turn on/off things for ipv4 and ipv6
independently. THis also ports the DHCP field over to it.
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This undoes a small part of 13790add4bf648fed816361794d8277a75253410
which was erroneously added, given that zero length datagrams are OK,
and hence zero length reads on a SOCK_DGRAM be no means mean EOF.
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Now that networkd's IP masquerading support means that running
containers with "--network-veth" will provide network access out of the
box for the container, let's add a shortcut "-n" for it, to make it
easily accessible.
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Should hopefully make it clear that this is not some magic value, just the default we picked.
Suggested by Jan Engelhardt.
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cannot work elsewhere
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database when untarring
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This exposes an IP port on the container as local port using DNAT.
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This adds two new settings to networkd's .network files:
IPForwarding=yes and IPMasquerade=yes. The former controls the
"forwarding" sysctl setting of the interface, thus controlling whether
IP forwarding shall be enabled on the specific interface. The latter
controls whether a firewall rule shall be installed that exposes traffic
coming from the interface as coming from the local host to all other
interfaces.
This also enables both options by default for container network
interfaces, thus making "systemd-nspawn --network-veth" have network
connectivity out of the box.
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rules, using libiptc
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Commit 3bd5c3 added a check for EACCES, but missed the minus sign.
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Not all of the link_config struct was getting freed.
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deb6120920 'man: there's actually no "fail" fstab option, but only
"nofail" removed it from our documentation, which I missed.
fstab(5) only mentions "auto", "noauto", and "nofail". Stick to
those three.
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Just a simple variable rename, and a dropped flag that sd-bus didn't make
use of.
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