Provided by: system-image-common_3.1+16.04.20160407-0ubuntu1_all 
NAME
system-image.ini - Ubuntu System Image Upgrader configuration files
DESCRIPTION
/etc/system-image/config.d is the default configuration directory for the system image upgrader. It
contains ini-style configuration files with sections that define the service to connect to, as well as
local system resources. Generally, the options never need to be changed.
The system image upgrader will read all files in this directory that start with a numeric prefix,
followed by an underscore, and then any alphanumeric suffix, ending in .ini. E.g. 07_myconfig.ini.
The files are read in sorted numerical order, from lowest prefix number to highest, with later
configuration files able to override any variable in any section.
SYNTAX
Sections in the .ini files are delimited by square brackets, e.g. [service]. Variables inside the
service separate the variable name and value by a colon. Blank lines and lines that start with a # are
ignored.
THE SERVICE SECTION
The section that starts with [service] defines the remote host name and ports that provide upgrade
images. Because some files are downloaded over HTTP and others over HTTPS, both ports must be defined.
This section contains the following variables:
base The host name to connect to containing the upgrade. This host must provide both HTTP and HTTPS
services.
http_port
The port for HTTP connections. This is an integer, or the string disabled if you wish to disable
all HTTP connections and use only HTTPS. It is an error to disable both the HTTP and HTTPS
services.
https_port
The port for HTTPS connections. This is an integer, or the string disabled if you wish to disable
all HTTPS connections and use only HTTP. It is an error to disable both the HTTP and HTTPS
services.
channel
The upgrade channel.
device The device name. If missing or unset (i.e. the empty string), then the device is calculated using
the [hooks]device callback.
build_number
The system's current build number.
THE SYSTEM SECTION
The section that starts with [system] defines attributes of the local system to be upgraded. Every
system has an upgrade channel and a device name. The channel roughly indicates the frequency with which
the server will provide upgrades. The system is queried for the device. The channel and device combine
to define a URL path on the server to look for upgrades appropriate to the given device on the given
schedule. The specification for these paths is given in [1].
This section contains the following variables:
tempdir
The base temporary directory on the local file system. When any of the system-image processes
run, a secure subdirectory inside tempdir will be created for the duration of the process.
logfile
The file where logging output will be sent.
loglevel
The level at which logging information will be emitted. There are two loggers which both log
messages to logfile. "systemimage" is the main logger, but additional logging can go to the
"systemimage.dbus" logger. The latter is used in debugging situations to get more information
about the D-Bus service.
loglevel can be a single case-insensitive string corresponding to the following log levels from
least verbose to most verbose: DEBUG, INFO, WARNING, ERROR, CRITICAL. In this case, the
"systemimage" logger will be placed at this level, while the "systemimage.dbus" logger will be
placed at the ERROR level.
loglevel can also describe two levels, separated by a colon. In this case, the main logger is
placed at the first level, while the D-Bus logger is placed at the second level. For example:
debug:info.
timeout
The maximum allowed time interval for downloading the individual files. The actual time to
complete the downloading of all required files may be longer than this timeout. This variable
takes a numeric value followed by an optional interval marker. Supported markers are w for weeks,
d for days, h for hours, m for minutes, and s for seconds. When no marker is given, the default
is seconds. Thus a value of 1m indicates a timeout of one minute, while a value of 15 indicates a
timeout of 15 seconds. A negative or zero value indicates that there is no timeout.
THE GPG SECTION
The section that starts with [gpg] defines paths on the local file system used to cache GPG keyrings in
compressed tar format. The specification for the contents of these files is given in [2]. This section
contains the following variables:
archive_master
The location on the local file system for the archive master keyring. This key will never expire
and never changes.
image_master
The location on the local file system for the image master keyring. This key will never expire
and will change only rarely, if ever.
image_signing
The location on the local file system for the image signing keyring. This key expires after two
years, and is updated regularly.
device_signing
The location on the local file system for the optional device signing keyring. If present, this
key expires after one month and is updated regularly.
THE UPDATER SECTION
The section that starts with [updater] defines directories where upgrade files will be placed for
recovery reboot to apply. This section contains the following variables:
cache_partition
The directory bind-mounted read-write from the Android side into the Ubuntu side, containing the
bulk of the upgrade files.
data_partition
The directory bind-mounted read-only from the Ubuntu side into the Android side, generally
containing only the temporary GPG blacklist, if present.
THE HOOKS SECTION
The section that starts with [hooks] provides minimal capability to customize the upgrader operation by
selecting different upgrade path winner scoring algorithms and different reboot commands. This section
contains the following variables:
device The Python import path to the class implementing the device query command.
scorer The Python import path to the class implementing the upgrade scoring algorithm.
apply The Python import path to the class that implements the mechanism for applying the update. This
often reboots the device.
New in system-image 3.0: ``reboot`` was renamed to ``apply``
THE DBUS SECTION
The section that starts with [dbus] controls operation of the system-image-dbus(8) program. This section contains the following variables: lifetime The total lifetime of the DBus server. After this amount of time, it will automatically exit. The format is the same as the [system]timeout variable.
SEE ALSO
system-image-cli(1) [1]: https://wiki.ubuntu.com/ImageBasedUpgrades/Server [2]: https://wiki.ubuntu.com/ImageBasedUpgrades/GPG
AUTHOR
Barry Warsaw <barry@ubuntu.com>
COPYRIGHT
2013-2016 Canonical Ltd.