[jira] [Commented] (FELIX-6304) bundle:bundle generates non-reproducible JAR archives (timestamps)

["Jochen Schalanda (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-6304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157975#comment-17157975 ] 

Jochen Schalanda commented on FELIX-6304:
-----------------------------------------

Digging into the sources, I found that it's possible to produce JAR archives with constant timestamps when passing the parameter *-reproducible* in the *BND instructions*:

 
{code:java}
<plugin>
  <groupId>org.apache.felix</groupId>
  <artifactId>maven-bundle-plugin</artifactId>
  <version>5.1.1</version>
  <extensions>true</extensions>
  <configuration>
    <instructions>
      <!-- https://stackoverflow.com/a/29853163/49505 -->
      <_removeheaders>Bnd-LastModified</_removeheaders>
      <_reproducible>true</_reproducible>
    </instructions>
  </configuration>
</plugin>
{code}
It would be great if this could either be documented properly or a configuration setting for maven-bundle-plugin would exist to enable the *-reproducible* flag.

 

> bundle:bundle generates non-reproducible JAR archives (timestamps)
> ------------------------------------------------------------------
>
>                 Key: FELIX-6304
>                 URL: https://issues.apache.org/jira/browse/FELIX-6304
>             Project: Felix
>          Issue Type: Bug
>          Components: Maven Bundle Plugin
>    Affects Versions: maven-bundle-plugin-5.1.1
>            Reporter: Jochen Schalanda
>            Priority: Major
>              Labels: reproducible-builds
>
> The JAR archives built by maven-bundle-plugin are not reproducible (as in reproducible builds) because the timestamps of their entries are variable and are using the current system time.
> The maven-jar-plugin supports using a fixed timestamp via the [outputTimestamp|https://maven.apache.org/plugins/maven-jar-plugin/jar-mojo.html#outputTimestamp] setting (default: {{${project.build.outputTimestamp}}}) while the maven-bundle-plugin doesn't expose a similar setting.
> Support for reproducible builds in the maven-jar-plugin was added with this commit: [https://github.com/apache/maven-jar-plugin/commit/64c5e6530b4712cd95501fffb2de6bb1a202cd89]



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