[jira] [Created] (NETBEANS-433) Improve merge discipline

["Karl Richter (JIRA)" <ji...@apache.org>]

Karl Richter created NETBEANS-433:
-------------------------------------

             Summary: Improve merge discipline
                 Key: NETBEANS-433
                 URL: https://issues.apache.org/jira/browse/NETBEANS-433
             Project: NetBeans
          Issue Type: Task
            Reporter: Karl Richter


The git repository https://github.com/apache/incubator-netbeans.git contains a lot of duplicate commits (e.g.

{noformat}
commit 90366d092beb49d563922c8023093d91d6b59db1 (HEAD -> master, origin/master, origin/HEAD)
Merge: ccc9b5f92 4c4bdd60a
Author: Jaroslav Tulach <ja...@oracle.com>
Date:   Mon Feb 26 07:59:53 2018 +0100

    Merge pull request #434 from blackleg/ci_badges
    
    Add build badges to README.md

commit 4c4bdd60adc2a26800621a76220dab7b146d80f4
Author: Hector Espert <he...@gmail.com>
Date:   Sun Jan 21 12:47:26 2018 +0100

    Added build badges to README.md

{noformat}

as well as merge commits (the duplicate example even introduces an empty separate merge commit for a fast-forward merge).

The duplicate commits should simply be avoided since they increase the number commits which have to be investigated in bisection search of regressions. Furthermore they make it harder to go through git log and make the code base appear in bad shape.

The merge commits should be avoided because they disturb the history log and hide information what really happened on the merge branch. It's fine to force all contributors to rebase their pull request branches on `master`. In this way all merges are fast-forward merges and all commit messages contain exclusively useful information. You can take https://github.com/zfsonlinux/zfs as an example for an excellent code base.



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