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https://issues.apache.org/jira/browse/JCRVLT-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17718533#comment-17718533
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Julian Reschke commented on JCRVLT-683:
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My 2 cents: I have no idea whether this change is needed. But I will note that
if it might break existing workflows/content, it should be possible to opt-out
this behavior (or actually make it opt-in).
> Import of Authorizable node with acHandling=IGNORE should preserve existing
> rep:principalPolicy child node
> ----------------------------------------------------------------------------------------------------------
>
> Key: JCRVLT-683
> URL: https://issues.apache.org/jira/browse/JCRVLT-683
> Project: Jackrabbit FileVault
> Issue Type: Bug
> Components: Packaging
> Affects Versions: 3.6.6
> Reporter: Mark Adamcin
> Assignee: Konrad Windszus
> Priority: Major
> Fix For: 3.6.10
>
>
> For situations where an authorizable node may be distributed from another
> environment where a different rep:principalPolicy for the user is defined
> than exists for that user in the target environment, it is important that the
> existing rep:principalPolicy be preserved when acHandling is unset,
> acHandling=IGNORE, or acHandling=MERGE_PRESERVE.
> Currently, the effective behavior of such a package install, as [it appears
> to be implemented in
> DocViewImporter|https://github.com/apache/jackrabbit-filevault/blob/5f9657374bd6c2d3dd1f6e9e2be0b9f5b25ddc26/vault-core/src/main/java/org/apache/jackrabbit/vault/fs/impl/io/DocViewImporter.java#L782-L787],
> results in the following:
> * If the package specifies acHandling=IGNORE, the existing
> rep:principalPolicy is deleted without replacement, regardless of whether the
> package contains its own rep:principalPolicy, which is equivalent to
> *acHandling=CLEAR*
> * If the package specifies acHandling=MERGE_PRESERVE or MERGE, the existing
> rep:principalPolicy is replaced with whatever rep:principalPolicy is
> contained in the package, or deletes the policy if a replacement is not
> present, which is equivalent to *acHandling=OVERWRITE*
> Unexpectedly, the least destructive (and most default) acHandling mode
> (IGNORE) turns out to be as destructive to packaged system user permissions
> as choosing any other mode.
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