Gluon contains an automatic update system which can be configured in the site configuration.
By default, the autoupdater is disabled (as it is usually not helpful to have unexpected updates
during development), but it can be enabled by setting the variable
1 when building.
It is also possible to override the default branch during build using the variable
If a default branch is set neither in site.conf nor via
GLUON_AUTOUPDATER_BRANCH, the default branch is
implementation-defined. Currently, the branch with the first name in alphabetical order is chosen.
A manifest file for the updater can be generated with make manifest. A signing script (using
ecdsautils) can be found in the contrib directory. When creating the manifest, the
PRIORITY value may be defined by setting
GLUON_PRIORITY on the command line or in
GLUON_PRIORITY defines the maximum number of days that may pass between releasing an update and installation
of the images. The update probability will start at 0 after the release time declared in the manifest file
by the variable DATE and then slowly rise up to 1 when
GLUON_PRIORITY days have passed. The autoupdater checks
for updates hourly (at a random minute of the hour), but usually only updates during its run between
4am and 5am, except when the whole
GLUON_PRIORITY days and another 24 hours have passed.
GLUON_PRIORITY may be an integer or a decimal fraction.
GLUON_RELEASE is passed to
make explicitly or it is generated dynamically
site.mk, care must be taken to pass the same
as otherwise the generated manifest will be incomplete.
The manifest starts with a short header, followed by the list of firmwares and signatures. The header contains the following information:
BRANCHis the autoupdater branch name that needs to match the nodes configuration.
DATEspecifies when the time period for the update begins. Nodes will do their regular update during a random minute between 4:00 and 4:59 am. Nodes might not always have a reliable NTP synchronization, which is why a fallback mechanism exists, that checks for an update, and will execute if
DATEis at least 24h in the past.
PRIORITYcan be configured as
GLUON_PRIORITYwhen generating the manifest or in
site.mk, and defines the number of days over which the update should be stretched out after
DATE. Nodes will calculate a probability based on the time left to determine when to update.
Automated nightly builds
A fully automated nightly build could use the following commands:
# git -C site pull
make clean GLUON_TARGET=ath79-generic
NUM_CORES_PLUS_ONE=$(expr $(nproc) + 1)
make -j$NUM_CORES_PLUS_ONE GLUON_TARGET=ath79-generic GLUON_RELEASE=$GLUON_RELEASE \
make manifest GLUON_RELEASE=$GLUON_RELEASE GLUON_AUTOUPDATER_BRANCH=experimental
contrib/sign.sh $SECRETKEY output/images/sysupgrade/experimental.manifest
rm -rf /where/to/put/this/experimental
cp -r output/images /where/to/put/this/experimental
We suggest to have following directory tree accessible via http:
The server must be available via IPv6.
These commands can be used on a node:
# Update with some probability
# Force update check, even when the updater is disabled
# If fallback is true the updater will perform an update only if the timespan
# PRIORITY days (as defined in the manifest) and another 24h have passed