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2     <head>
3     </head>
4     <body>
5 cnh 1.3 MITGCM CVS policies
6     ===================
7 cnh 1.1
8     o Introduction
10 cnh 1.3 This note describes policies that apply to the MITGCM CVS repository
11 cnh 1.1
12     o Why have a policy?
14     CVS itself is a liberal free-for-all product that can be used in a variety
15     of ways. It is designed to provide a system for storing arbitrary files
16     in a way that allows the change history of the individual files to be
17     tracked. If CVS is used without any other policy the result can be a
18     collection of files each of which has complex, multiply branched set of
19     interelated versions. This sort of CVS repository can be come like a
20 cnh 1.2 library where books are simply stored in a huge heap. Although nothing is
21     actually lost, the task of finding a coherent collection of material soon
22 cnh 1.1 becomes impossible.
24     The policies we employ address two areas
25     1. Maintaining an orderly and easily identifiable, coherent set of
26     evolving "products".
27     2. Allowing concurrent, on-going development of products.
29     o Development trees and checkpoint trees
31 cnh 1.3 A directory within the MITGCM repository resides under either the
32 cnh 1.1 development branch or the checkpoint branch. Files within each branch
33     follow different policies.
35     o Development tree policies
37     Development trees are intended to be flexible areas where arbitrary files
38     can be stored with multiple versions, many branches supporting multiple
39     ongoing streams of development. Development trees have no policies in
40     place to control complexity. Development trees might be associated with
41     a particular person, a certain project or a particular special piece of
42     work. These trees are intended to be useful areas for storing current
43     work and for archiving partially finished work so that it doesn't get
44     mislaid and s that some record of the development history can be easily
45     maintained. The only policy that applies to development trees is that
46     this style of tree is not intended to be used for providing a
47     "checkpoint" distribution. Tagged configurations of tools built from this
48     style of tree can be distributed, but because these trees do not have any
49     polcies regarding testing of functionality, platform coverage or
50     documentation these trees are not allowed to form the basis of
51     "checkpoint" distrbutions or formal model releases. Other policies can
52     be defined by individuals users of these trees but there are no further
53 cnh 1.3 global policies. The MITGCM repository development/ subdirectory is
54 cnh 1.1 reserved for holding development trees. Development trees also serve as
55     experimental areas for exploring new code management policies.
57     o Checkpoint tree policies
59     Checkpoint trees are intended to provide structured storage areas for
60     holding code that is intended for open distribution and is to be readily
61     downloaded. There are policies governing the operation of these trees
62     which are designed to ensure that distributed codes are clearly
63     identified and meet certain levels of quality.
65     1. Check-out
67     Just do it! Two mechanisms are available. cvsanon for read only access
68     and regular cvs co .... for read/write access.
70     2. Check-in.
72     The code check in procedure for a "checkpoint" tree is as follows
73     2.1 Check out the latest main branch revision.
74     2.2 Merge your changes into that revision.
75     2.3 Build and validate new code.
76     2.4 Check that there have been no further changes to the
77     repository. Repeat from 2.1 if repository has changed.
78     2.5 Get clearance from other developers to check in your changes.
79     2.6 Check in your changed main branch.
80     2.8 Build and validate the new changes.
81     2.9 Tag code as "checkpointNN". Add records to docs/tag-index.
82     2.10 Build and validate test cases (see testing).
83     2.11 Create and install checkpointNN.tar.gz
85     3. Testing
87 cnh 1.2 Things in a checkpoint tree require a test case that
88     can be used to validate the component.
90 cnh 1.1 4. Checkpoint tagging
92 cnh 1.2 No code should be left in limbo. Checking in code and then
93     leaving it in the repository untagged is bad. When you check
94     in code you are creating a new checkpoint. That means you don't
95     check in some code which you "know" works 100% and then go away
96     for two weeks. When you start checking in code you make sure
97     you have time to do the process end-to-end as described in section
98     2.
100 cnh 1.1 5. Release tagging
102 cnh 1.2 Releases are only based on checkpoint tree code. Maintenance fixes
103     to releases are also maintained within the checkpoint tree. Files
104     within a release must have accompanying documentation. The form of this
105     documentation depends on the file type.
107 cnh 1.1 6. Branches
109     Branches are to be used for bug-fixes and code patches to releases
110     only. All other changes e.g. totally new features, bug-fixes to
111     checkpoints are introduced by moving checkpoint levels forward. The
112     only historical code maintenance that is employed is for fixes and
113     patches to formal releases - not checkpoints.
115     o These policies are causing me a big problem, what can I do?
117     The policies are not enforced by any mechanism other than mutual
118     agreement! If you think the policies are not appropriate then let us know
119     and we can discuss changing them. However, if you simply ignore the
120     policies regarding the checkpoint_release trees then your code may be
121     removed and/or your access revoked.
123     o What about bitkeeper
125     We are looking at bitkeeper (www.bitkeeper.com). It looks cool, but
126     policies are still important. Any experience, suggestions let us know.
127     Watch this space!
129 cnh 1.3 Questions, comments e-mail: code.czars@mitgcm.org
130 cnh 1.2 </body>
131     </html>

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