Georg Henzler created SLING-7790:
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Summary: Allow for synchronous installation of bundles and
configurations via install hook
Key: SLING-7790
URL: https://issues.apache.org/jira/browse/SLING-7790
Project: Sling
Issue Type: New Feature
Components: Installer
Reporter: Georg Henzler
Assignee: Georg Henzler
Normally bundles configurations are installed asynchronously after a bundle is
saved to the JCR during package installation (vault packages). This is due to
the backgroundThread that the OsgiInstallerImpl is using. Since the
introduction of the pauseInstallation signal node SLING-3747, the installation
of bundles and configurations is forced to after the completed vault package
installation. This behaviour also means that the package dependency can be
declared, but they are not effective on "contained bundle level" but only on
JCR content level. The following is not possible today:
Complete Package with sub packages:
* Package A (containing Bundle A)
* Package B (containing Bundle B) with dependency to bundle A
If it is just a OSGi package dependency from Bundle B to bundle A the
installation order does not matter (the OSGi framework will sort it out).
However if the content of package B has a dependency to bundle A (think custom
oak restrictions [1] or install hooks referenced) there will be an error.
To allow for those cases and to avoid manual steps (not providing a complete
package often means exactly that), it would be good to have a means to install
contained bundles of a package synchronously. This can be achieved by a fairly
simple install hook that "pre-installs" the contained InstallableResources with
the correct digest to the via the OsgiInstaller. The subsequent call of
sling-org-apache-sling-installer-provider-jcr will just update the already
installed resource again with the same digest (which will not cause any action
in the system).
Obviously this mechanism should only be used where needed and only for
configurations and bundles that are safe to install (that will never restart
any of the base services), using the install hook makes the mechanism "opt-in".
[1]
https://sling.apache.org/documentation/bundles/sling-oak-restrictions.html
https://jackrabbit.apache.org/oak/docs/security/authorization/restriction.html#pluggability
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