org.freedesktop.portable1 — The D-Bus interface of systemd-portabled
systemd-portabled.service(8) is a system service that may be used to attach, detach and inspect portable services. This page describes the D-Bus interface.
The service exposes the following interfaces on the Manager object on the bus:
node /org/freedesktop/portable1 {
interface org.freedesktop.portable1.Manager {
methods:
GetImage(in s image,
out o object);
ListImages(out a(ssbtttso) images);
GetImageOSRelease(in s image,
out a{ss} os_release);
GetImageMetadata(in s image,
in as matches,
out s image,
out ay os_release,
out a{say} units);
GetImageMetadataWithExtensions(in s image,
in as extensions,
in as matches,
in t flags,
out s image,
out ay os_release,
out a{say} extensions,
out a{say} units);
GetImageState(in s image,
out s state);
GetImageStateWithExtensions(in s image,
in as extensions,
in t flags,
out s state);
AttachImage(in s image,
in as matches,
in s profile,
in b runtime,
in s copy_mode,
out a(sss) changes);
AttachImageWithExtensions(in s image,
in as extensions,
in as matches,
in s profile,
in s copy_mode,
in t flags,
out a(sss) changes);
DetachImage(in s image,
in b runtime,
out a(sss) changes);
DetachImageWithExtensions(in s image,
in as extensions,
in t flags,
out a(sss) changes);
ReattachImage(in s image,
in as matches,
in s profile,
in b runtime,
in s copy_mode,
out a(sss) changes_removed,
out a(sss) changes_updated);
ReattachImageWithExtensions(in s image,
in as extensions,
in as matches,
in s profile,
in s copy_mode,
in t flags,
out a(sss) changes_removed,
out a(sss) changes_updated);
RemoveImage(in s image);
MarkImageReadOnly(in s image,
in b read_only);
SetImageLimit(in s image,
in t limit);
SetPoolLimit(in t limit);
properties:
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly s PoolPath = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t PoolUsage = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t PoolLimit = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly as Profiles = ['...', ...];
};
interface org.freedesktop.DBus.Peer { ... };
interface org.freedesktop.DBus.Introspectable { ... };
interface org.freedesktop.DBus.Properties { ... };
};
GetImage() may be used to get the image object path of the image with the
specified name.
ListImages() returns an array of all currently known images. The
structures in the array consist of the following fields: image name, type, read-only flag, creation
time, modification time, current disk space, usage and image object path.
GetImageOSRelease() retrieves the OS release information of an image.
This method returns an array of key value pairs read from the
os-release(5) file in
the image and is useful to identify the operating system used in a portable service.
GetImageMetadata() retrieves metadata associated with an image.
This method returns the image name, the image's os-release(5) content in the form of a (streamable) array of bytes,
and a list of portable units contained in the image, in the form of a string (unit name) and
an array of bytes with the content.
GetImageMetadataWithExtensions() retrieves metadata associated with an
image. This method is a superset of GetImageMetadata() with the addition of a list
of extensions as input parameter, which were overlaid on top of the main image via
AttachImageWithExtensions(). The path of each extension and an array of bytes with
the content of the respective extension-release file are returned, one such structure for each
extension named in the input arguments.
GetImageState() retrieves the image state as one of the following
strings:
detached
attached
attached-runtime
enabled
enabled-runtime
running
running-runtime
GetImageStateWithExtensions() is a superset of
GetImageState(), with additional support for a list of extensions
as input parameters, which is necessary to query the state in case the image was attached
in that particular way. The flag parameter is currently unused and
reserved for future purposes.
AttachImage() attaches a portable image to the system.
This method takes an image path or name, a list of strings that will be used to search for
unit files inside the image (partial or complete matches), a string indicating which
portable profile to use for the image (see Profiles property for
a list of available profiles), a boolean indicating whether to attach the image only
for the current boot session, and a string representing the preferred copy mode
(whether to copy the image or to just symlink it) with the following possible values:
(null)
copy
symlink
This method returns the list of changes applied to the system (for example, which unit was added and is now available as a system service). Each change is represented as a triplet of strings: the type of change applied, the path on which it was applied, and the source (if any). The type of change applied will be one of the following possible values:
copy
symlink
write
mkdir
Note that an image cannot be attached if a unit that it contains is already present on the system.
AttachImageWithExtensions() attaches a portable image to the system.
This method is a superset of AttachImage() with the addition of
a list of extensions as input parameter, which will be overlaid on top of the main
image. When this method is used, detaching must be done by passing the same arguments via the
DetachImageWithExtensions() method. For more details on this functionality,
see the MountImages= entry on
systemd.exec(5)
and systemd-sysext(8).
DetachImage() detaches a portable image from the system.
This method takes an image path or name, and a boolean indicating whether the image to
detach was attached only for the current boot session or persistently. This method
returns the list of changes applied to the system (for example, which unit was removed
and is no longer available as a system service). Each change is represented as a triplet of
strings: the type of change applied, the path on which it was applied, and the source
(if any). The type of change applied will be one of the following possible values:
unlink
Note that an image cannot be detached if a unit that it contains is running.
DetachImageWithExtensions() detaches a portable image from the system.
This method is a superset of DetachImage() with the addition of
a list of extensions as input parameter, which were overlaid on top of the main
image via AttachImageWithExtensions().
The flag parameter is currently unused and reserved for future purposes.
ReattachImage() combines the effects of the
AttachImage() method and the DetachImage() method.
The difference is that it is allowed to reattach an image while one or more of its units
are running. The reattach operation will fail if no matching image is attached.
The input parameters match the AttachImage() method, and the return
parameters are the combination of the return parameters of the
DetachImage() method (first array, units that were removed) and the
AttachImage() method (second array, units that were updated or added).
ReattachImageWithExtensions() reattaches a portable image to the system.
This method is a superset of ReattachImage() with the addition of
a list of extensions as input parameter, which will be overlaid on top of the main
image. For more details on this functionality, see the MountImages= entry on
systemd.exec(5)
and systemd-sysext(8).
The flag parameter is currently unused and reserved for future purposes
RemoveImage() removes the image with the specified name.
MarkImageReadOnly() toggles the read-only flag of an image.
SetPoolLimit() sets an overall quota limit on the pool of images.
SetImageLimit() sets a per-image quota limit.
The AttachImageWithExtensions(),
DetachImageWithExtensions() and
ReattachImageWithExtensions() methods take in options as flags instead of
booleans to allow for extendability. SD_SYSTEMD_PORTABLE_FORCE_ATTACH will cause
safety checks that ensure the units are not running while the new image is attached or detached
to be skipped. SD_SYSTEMD_PORTABLE_FORCE_SYSEXT will cause the check that the
extension-release. file in the extension image
matches the image name to be skipped. They are defined as follows:NAME
#define SD_SYSTEMD_PORTABLE_RUNTIME (UINT64_C(1) << 0)
#define SD_SYSTEMD_PORTABLE_FORCE_ATTACH (UINT64_C(1) << 1)
#define SD_SYSTEMD_PORTABLE_FORCE_SYSEXT (UINT64_C(1) << 2)
PoolPath specifies the file system path where images are written to.
PoolUsage specifies the current usage size of the image pool in bytes.
PoolLimit specifies the size limit of the image pool in bytes.
Profiles specifies the available runtime profiles for portable services.
The service exposes the following interfaces on the Image object on the bus:
node /org/freedesktop/portable1 {
interface org.freedesktop.portable1.Image {
methods:
GetOSRelease(out a{ss} os_release);
GetMetadata(in as matches,
out s image,
out ay os_release,
out a{say} units);
GetMetadataWithExtensions(in as extensions,
in as matches,
in t flags,
out s image,
out ay os_release,
out a{say} extensions,
out a{say} units);
GetState(out s state);
GetStateWithExtensions(in as extensions,
in t flags,
out s state);
Attach(in as matches,
in s profile,
in b runtime,
in s copy_mode,
out a(sss) changes);
AttachWithExtensions(in as extensions,
in as matches,
in s profile,
in s copy_mode,
in t flags,
out a(sss) changes);
Detach(in b runtime,
out a(sss) changes);
DetachWithExtensions(in as extensions,
in t flags,
out a(sss) changes);
Reattach(in as matches,
in s profile,
in b runtime,
in s copy_mode,
out a(sss) changes_removed,
out a(sss) changes_updated);
ReattacheWithExtensions(in as extensions,
in as matches,
in s profile,
in s copy_mode,
in t flags,
out a(sss) changes_removed,
out a(sss) changes_updated);
Remove();
MarkReadOnly(in b read_only);
SetLimit(in t limit);
properties:
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly s Name = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly s Path = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly s Type = '...';
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly b ReadOnly = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t CreationTimestamp = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t ModificationTimestamp = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t Usage = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t Limit = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t UsageExclusive = ...;
@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
readonly t LimitExclusive = ...;
};
interface org.freedesktop.DBus.Peer { ... };
interface org.freedesktop.DBus.Introspectable { ... };
interface org.freedesktop.DBus.Properties { ... };
};
The following methods implement the same operation as the respective methods on the
Manager object (see above). However, these methods operate on the image
object and hence does not take an image name parameter. Invoking the methods directly on the Manager
object has the advantage of not requiring a GetImage() call to get the image object
for a specific image name. Calling the methods on the Manager object is hence a round trip
optimization. List of methods:
GetOSRelease()
GetMetadata()
GetMetadataWithExtensions()
GetState()
Attach()
AttachWithExtensions()
Detach()
DetachWithExtensions()
Reattach()
ReattacheWithExtensions()
Remove()
MarkReadOnly()
SetLimit()
Name specifies the image name.
Path specifies the file system path where image is stored.
Type specifies the image type.
ReadOnly specifies whether the image is read-only.
CreationTimestamp specifies the image creation timestamp.
ModificationTimestamp specifies the image modification timestamp.
Usage specifies the image disk usage.
Limit specifies the image disk usage limit.
UsageExclusive specifies the image disk usage (exclusive).
LimitExclusive specifies the image disk usage limit (exclusive).