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https://issues.apache.org/jira/browse/MSHARED-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17158481#comment-17158481
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Robert James Oxspring commented on MSHARED-884:
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Note that this is fixed in master and just awaiting a release:
https://github.com/apache/maven-shared-utils/commit/e57180309a64758e161513d80f1185e13dc84826
> Only overwrite filtered resources when contents differ
> ------------------------------------------------------
>
> Key: MSHARED-884
> URL: https://issues.apache.org/jira/browse/MSHARED-884
> Project: Maven Shared Components
> Issue Type: Improvement
> Components: maven-filtering
> Reporter: Robert James Oxspring
> Assignee: Olivier Lamy
> Priority: Major
>
> When filtering files with the {{MavenFileFilter.copyFile}} method, the
> destination file should only be overwritten if the contents have changed.
> Currently we unconditionally overwrite the contents in this situation,
> potentially leading to unnecessary downstream work. When the {{overwrite}}
> parameter is {{true}} then overwriting should overwrite as it does now.
> Given a {{copyFile}} call
> When an identical {{copyFile}} operation is performed
> Then the destination file should remain unmodified
> Given a {{copyFile}} call with {{overwrite}} set {{true}}
> When an identical {{copyFile}} operation is performed
> Then the destination file should be overwritten
> The [linked pull request|https://github.com/apache/maven-filtering/pull/5]
> meets these requirements by writing the filtered resource to a temporary file
> and then comparing the temporary contents to the content of a previously
> written target file. If the contents match then the temporary file is
> deleted, otherwise it's renamed over the top of the target file.
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