Re: [RFC] [PATCH 0/5] Implement 'prior' commit object links (and

On Sat, 29 Apr 2006, linux@horizon.com wrote:

Well, the only reason that you need ANY commit in the repository is
because it's part of history, and comparing it with other versions is
meaningful.  So what trees, not already in the ancestry graph of a
given commit, are useful to compare to?  In particular, useful for some
automated process; manual comparisons can always be done manually.

Nothing's jumping out at me.  Any suggestions?

See below.

Not necessary all those require connectivity.
Most of them are not my ideas.

 * "prior" - heads that represent topic branch merges

    This is the "pu" branch case, where the head is a merge of several
    topic branches that is continually moved forward.

    topic branches     head
      ,___.   ,___.
     | TA1 | | TB1 |
      `---'   `---'    ,__.
         ^\_____^\____| H1 |
                       `--'

    + some topic branch changes and a republish:

      ,___.   ,___.
     | TA1 | | TB1 |
      `---'   `---'^   ,__.
        |^\_____^\____| H1 |
        |       |      `--'
      ,_|_.   ,_|_.      P
     | TA2 | | TB2 |     |
      `---'   `---'^     |
        ^       ^        |
      ,_|_.     |        |
     | TA3 |    |        |
      `---'     |      ,__.
         ^\______\____| H2 |
                       `--'

    key:  ^ = parent   P = prior


 * "bind" - for subprojects

   bind links from master project commit to externally managed embedded
   third-party project, for example Linux kernel for some mainly userspace
   project, or library or engine for some application. Additionally it
   provides root dir where to attach subproject.

 
 * "original" for rebase

   before rebase:

             A---B---C topic
            /
           /
          /
     D---E---F---G master

   after rebase

              ------A---B---C
             /      ^   ^   ^ 
            /       :   :   :
           /        A'--B'--C' topic
          /       /
     D---E---F---G master


   where ':' denotes "original" link. Note that old branch is not pointed by
   any head, and would be pruned without connectivity


 * "original" or "cherrypick" for cherry-picking

            A--------B---C bugfix
           /         ^
          /          :
     D---E---F---G---B'---H main


 * "revert" for reverting commits

-- 
Jakub Narebski