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a few updates on git

    1: ## NetBSD with git so far
    2: 
    3: [core statement on vcs](http://mail-index.netbsd.org/tech-repository/2015/01/04/msg000497.html)
    4: 
    5: ### Low memory hosts:
    6: 
    7: * [tuning for git on low memory](http://mail-index.netbsd.org/tech-repository/2015/01/08/msg000520.html)
    8: 
    9: git appears to have slightly different memory characteristics depending on the
   10: protocol used.  Over http I am able to get a full clone with all history on a
   11: 256 + 256 raspberri pi.  If you bump up the memory to 512 + 256 it makes ssh
   12: possible, which means writes are possible.
   13: 
   14: The link above has some tuning I used to get memory requirements way down.
   15: 
   16: It should be noted that git support a "shallow" clone (--depth 1) which ignores
   17: most history but allows commits and full development.
   18: A shallow clone works on very small systems; I would guess 128MB + a little swap
   19: is enough.
   20: 
   21: git is slow during 'status' by default since it searches the entire tree for a
   22: change.  It will produce a warning with tunable options if the command runs
   23: slowly.
   24: 
   25: ** Update
   26: After some complaining on the git@ mailing list a patch has been produced which
   27: drops the memory requirements down quite a bit.  I can now, without much tuning,
   28: work on my 512 system.  I'm pretty sure a 256 + swap without any special tuning
   29: would also work.
   30: 
   31: ### CVS in parallel
   32: 
   33: I do not think this is a good idea and do not plan to advocate for it.
   34: Git does have a cvs server built-in but I have not taken the time to set it up
   35: for testing because it is slightly involved and I don't see the purpose.
   36: 
   37: ### Conversion
   38: 
   39: One-shot to create the new True Source.  I don't think there will be many cvs
   40: hold-outs.
   41: 
   42: See above for CVS server provided if ongoing conversion is really desired.
   43: 
   44: ### existing cvs dependencies
   45: 
   46: TBD
   47: 
   48: ### How should NetBSD be setup
   49: 
   50: High level- private box for write master using ssh, any number of additional
   51: systems with read-only mirrors over http:// and git://
   52: 
   53: Also see a great description of how DragonflyBSD is setup:<br>
   54: [dfbsd server setup](http://lists.dragonflybsd.org/pipermail/users/2015-January/207421.html)<br>
   55: [dfbsd workflows](http://lists.dragonflybsd.org/pipermail/users/2015-January/207422.html)<br>
   56: [dfbsd config](http://lists.dragonflybsd.org/pipermail/users/2015-January/207424.html)<br>
   57: 
   58: ### how to install
   59: 
   60: git should fit into NetBSD src/tools easily.  I have not personally tested
   61: cross compilation.
   62: 
   63: ### workflows
   64: 
   65: See DragonflyBSD examples given above
   66: 
   67: There are many many workflows supported in git.  For the most part I think
   68: NetBSD developers would follow the "feature branch" workflow from the main repo
   69: (or private/semi-private clones before merge).
   70: 
   71: Public collaboration is a big feature of git since it can format patches into
   72: at least two different email formats and they can be submitted to a bug report
   73: or to a mailing list, which should allow clean apply.
   74: 
   75: A non-developer could also post a pull request to github or host his git repo
   76: for a friendly developer to add as an origin and pull his branch.
   77: 
   78: (git origin add future-developer http://example.com/~greatguy/src.git)
   79: 
   80: 
   81: ### log message formats
   82: 
   83: Try to references named branches/tags instead of sha-1's
   84: Also using the dates for commits instead of commit id's
   85: 
   86: ### how to convert
   87: 
   88: ESR?
   89: 
   90: ### No lock-in
   91: 
   92: I am unable to anticipate the next generation of SCM.
   93: Don't do anything weird like change history and we should be fine.
   94: 
   95: Maybe when we have 30 years of project history it will be time to consider
   96: restructuring the project.  :)
   97: 
   98: ---
   99: 
  100: I think this is less a function of the tool and more a function of the project not
  101: allowing non-"standard" actions.
  102: 
  103: ### Who, When, and How Long?
  104: 
  105: * ESR/Joerg - convert
  106: * sometime, eventually, maybe
  107: * assumptions/proposal:
  108: 
  109: Assuming conversion starting from date(x) to freeze(y) is relatively easy, the
  110: refinements of Joerg/ESR conversion can continue to run in read-only mode as they
  111: do today.  This means the "switch" is a few hours only for:
  112: 
  113: ** cvs goes read only
  114: ** history from last git conversion pull until now is appended
  115: ** cvs is turned off
  116: ** git is made available over ssh