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.mdwn]] 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
54: ** partial trees
55: ** partial history
56: * blacklist extension (which is a legal requirement)
57: * being able to migrate away in the future
58: * ...
60: Conversion of CVS repository phenomena
61: * vendor branches
62: * conversion of repo-copies and similar CVS horrors
63: * adding rename metadata to already-done moves
64: * pkgsrc not-really-vendor imports
65: * developer usernames vs. email addresses in log messages and commit metadata
66: * non-ascii text in log messages
67: * version references in log messages
68: * retaining CVS file version numbers as metadata
69: * restoring the pre-settlement history and/or including the CSRG history
71: 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
80: * what becomes of anoncvs
81: * making use of version numbers in mailing lists / security advisories
82: * patches/contributions/commits from non-developers
83: * collaborating with non-developers
85: Developer deployment issues
86: * commit procedures
87: * development branch procedures
88: * vendor branch procedures
89: * private branch procedures
90: * collaboration without pushing to the master repositories
91: * rebasing vs. merging
92: * how to refer to other commits in log messages
94: Many of these issues are already documented in [[the existing
95: workflows writeup|hgnb.mdwn]].
97: Releng deployment issues
98: * changes to the way pullups are filed
99: * release commit procedures
100: * release branch procedures
101: * dealing with accidental commits to release branches
102: * preventing accidental merges into release branches
103: * extracting formal release tarballs
104: * shipping source tarballs
105: * ...
107: Backend/admins deployment issues
108: * log_accum / source-changes mails
109: * access control for whole trees
110: * access control for subsections of trees
111: * backups
112: * pushing to anoncvs
113: * ...
115: cvs assumptions / scripted usage in the tree
116: * pkgsrc: changes-entry and commit-changes-entry
117: * pkgsrc: guide regen
118: * ...
120: Other questions
121: * running live in parallel with CVS during a transition period
122: * gatewaying to other VCS frontends
CVSweb for NetBSD wikisrc <wikimaster@NetBSD.org> software: FreeBSD-CVSweb