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https://jira.codehaus.org/browse/MASSEMBLY-647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=354129#comment-354129
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Kristian Rosenvold commented on MASSEMBLY-647:
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AFAIK there is no way to set these bits with java
> Archiver drops file/directory mode most significant bits
> --------------------------------------------------------
>
> Key: MASSEMBLY-647
> URL: https://jira.codehaus.org/browse/MASSEMBLY-647
> Project: Maven Assembly Plugin
> Issue Type: Bug
> Components: maven-archiver
> Affects Versions: 2.4
> Reporter: Leif Rilbe
>
> Problem detected when trying to build a zip assembly with directories having
> the setgid bit set.
> Wanted directory mode: drwxrws---
> Archiver config:
> <archiverConfig>
> <!-- (rwxrws===) = 2770(oct) -->
> <directoryMode>1528</directoryMode>
> <defaultDirectoryMode>1528</defaultDirectoryMode>
> </archiverConfig>
> FileSet config in assembly descriptor:
> <fileSet>
> <directory>${project.build.directory}</directory>
> <includes>
> <include>./</include>
> </includes>
> <outputDirectory>/</outputDirectory>
> <directoryMode>2770</directoryMode>
> </fileSet>
> Actual directory mode: drwxrwx---
> If I do not specify <directoryMode> in the assembly descriptor, the modes
> from the archiverConfig prevale, thus yielding the wanted directory mode.
> However, this behaviour seems brittle and possibly any use of <fileMode> or
> <directoryMode> in the assembly descriptors seems to "break" the use of the
> archiverConfig modes.
> From source code analysis it seems to me that fileset modes are handled by
> means of the org.codehaus.plexus.components.io.attributes.FileAttributes
> class. This class seems to not handle the most significant file mode bits
> (i.e. setuid/setgid/sticky bits). It seems that the assembly plugin sometimes
> routes permission through this class and sometimes not, which causes the most
> significant bits to be sometimes lost and sometimes not.
> Perhaps the best route would be to add handling of the setuid/setgid/sticky
> bits to the org.codehaus.plexus.components.io.attributes.FileAttributes class?
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