1: ## NetBSD migration path to Mercurial
3: This page describes what's involved in migrating NetBSD from CVS to
6: ### What Mercurial is
8: [[Mercurial|http://mercurial.selenic.com]] is an open-source version
9: control system.
10: It is a distributed version control system based on the commit
11: hashcode model shared with git and other DVCSes.
12: It is fast and powerful and has long emphasized a certain polish of
15: ### Why Mercurial
17: Mercurial is a modern VCS; it is maintained; it is capable of
18: handling the NetBSD repositories; and it is cleanly designed, simple,
19: and easy to use.
20: The first three of these properties are necessary requirements for
21: NetBSD to migrate (I don't think any of them are particularly
22: controversial); the last sets it apart from git, which is the other
23: immediately available alternative.
24: (The third option, writing our own, is not currently realistic.)
26: One could write a lot of gung-ho IT IS REALLY GR8!!!11!! boosterism
27: here too, of course, but I'll leave that for someone else.
29: ### Migration
31: There are two categories of issues related to migrating a project the
32: size of NetBSD: first, what the project and the world around the
33: project will look like after the migration is done, and second, what
34: things need to be done to get there.
35: The purpose of this page is to tackle the first: what things in the
36: project will be different and what they'll be like.
37: This includes not just user-facing things like commit procedures but
38: also backend considerations and administration.
40: There's a [[second page|hgtodo]] with a list of work that needs
41: to be done.
43: ### Issues
45: Technical concerns (demands on the system's operational model)
47: * atomic commits / changesets
48: * rename support
49: * authenticating commits
50: * numbered versions
51: * branch handling
52: * tag handling
53: * partial checkouts (partial trees, partial history)
54: * blacklist extension (which is a legal requirement)
55: * being able to migrate away in the future
56: * ...
58: Conversion of CVS repository phenomena
60: * vendor branches
61: * conversion of repo-copies and similar CVS horrors
62: * adding rename metadata to already-done moves
63: * pkgsrc not-really-vendor imports
64: * developer usernames vs. email addresses in log messages and commit metadata
65: * non-ascii text in log messages
66: * version references in log messages
67: * retaining CVS file version numbers as metadata
68: * restoring the pre-USL-settlement history and/or including the CSRG history
70: Implementation concerns (demands on the system as it exists)
72: * general performance
73: * importing into base, or not
74: * storage requirements vs. small systems
75: * memory requirements vs. small systems
76: * possible workarounds for small systems
77: * ...
79: Community deployment issues
81: * what becomes of anoncvs
82: * making use of version numbers in mailing lists / security advisories
83: * patches/contributions/commits from non-developers
84: * collaborating with non-developers
86: Developer deployment issues
88: * commit procedures
89: * development branch procedures
90: * vendor branch procedures
91: * private branch procedures
92: * collaboration without pushing to the master repositories
93: * rebasing vs. merging
94: * how to refer to other commits in log messages
96: Many of these issues are already documented in [[the existing
97: workflows writeup|hgnb]].
99: Releng deployment issues
101: * changes to the way pullups are filed
102: * adjusting processing scripts for new source-changes format
103: * release commit procedures
104: * release branch procedures
105: * dealing with accidental commits to release branches
106: * preventing accidental merges into release branches
107: * extracting formal release tarballs
108: * shipping source tarballs
109: * ...
111: Backend/admins deployment issues
113: * how commits get pushed to the master tree
114: * log_accum / source-changes mails
115: * access control for whole trees
116: * access control for subsections of trees
117: * backups
118: * pushing to anoncvs
119: * ...
121: cvs assumptions / scripted usage in the tree
123: * pkgsrc: changes-entry and commit-changes-entry
124: * pkgsrc: guide regen
125: * ...
127: Other questions
129: * running live in parallel with CVS during a transition period
130: * gatewaying to other VCS frontends
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