Provided by: systemd_256.5-2ubuntu3_amd64 
NAME
org.freedesktop.portable1 - The D-Bus interface of systemd-portabled
INTRODUCTION
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 MANAGER OBJECT
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 { ... };
};
Methods
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:
• (empty)
• copy
• symlink
• mixed
If an empty string is passed the security profile drop-ins and images will be symlinked
while unit files will be copied, copy will copy, symlink will prefer linking if possible
(e.g.: a unit has to be copied out of an image), and mixed will prefer linking the
resources owned by the OS (e.g.: the portable profile located within the host's /usr/
tree) but will copy the resources owned by the portable image (e.g.: the unit files and
the images). 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. Note that this method returns only after all the listed operations are completed,
and due to the I/O involved it might take some time.
In place of the image path a ".v/" versioned directory may be specified, see systemd.v(7)
for details.
In place of the directory path a ".v/" versioned directory may be specified, see
systemd.v(7) for details.
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. Note that
this method returns only after all the listed operations are completed, and due to the I/O
involved it might take some time.
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().
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).
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 bypass the safety checks
that ensure the units are not running while the image is attached or detached.
SD_SYSTEMD_PORTABLE_FORCE_EXTENSION will bypass the check that ensures the
extension-release.NAME file in the extension image matches the image name. They are
defined as follows:
#define SD_SYSTEMD_PORTABLE_RUNTIME (UINT64_C(1) << 0)
#define SD_SYSTEMD_PORTABLE_FORCE_ATTACH (UINT64_C(1) << 1)
#define SD_SYSTEMD_PORTABLE_FORCE_EXTENSION (UINT64_C(1) << 2)
Properties
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 IMAGE OBJECT
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);
ReattachWithExtensions(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 { ... };
};
Methods
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()
• ReattachWithExtensions()
• Remove()
• MarkReadOnly()
• SetLimit()
Properties
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).
VERSIONING
These D-Bus interfaces follow the usual interface versioning guidelines[1].
HISTORY
The Manager Object
GetImageStateWithExtensions() was added in version 251.
The Image Object
GetStateWithExtensions() was added in version 251.
ReattachWithExtensions() was added in version 254.
NOTES
1. the usual interface versioning guidelines
https://0pointer.de/blog/projects/versioning-dbus.html