2 HOW TOR VERSION NUMBERS WORK
12 Before 0.1.0, versions were of the format:
14 MAJOR.MINOR.MICRO(status(PATCHLEVEL))?(-cvs)?
16 where MAJOR, MINOR, MICRO, and PATCHLEVEL are numbers, status is one
17 of "pre" (for an alpha release), "rc" (for a release candidate), or
18 "." for a release. As a special case, "a.b.c" was equivalent to
19 "a.b.c.0". We compare the elements in order (major, minor, micro,
20 status, patchlevel, cvs), with "cvs" preceding non-cvs.
22 We would start each development branch with a final version in mind:
23 say, "0.0.8". Our first pre-release would be "0.0.8pre1", followed by
24 (for example) "0.0.8pre2-cvs", "0.0.8pre2", "0.0.8pre3-cvs",
25 "0.0.8rc1", "0.0.8rc2-cvs", and "0.0.8rc2". Finally, we'd release
26 0.0.8. The stable CVS branch would then be versioned "0.0.8.1-cvs",
27 and any eventual bugfix release would be "0.0.8.1".
31 Starting at 0.1.0.1-rc, versions are of the format:
33 MAJOR.MINOR.MICRO[.PATCHLEVEL][-STATUS_TAG][ (EXTRA_INFO)]*
35 The stuff in parentheses is optional. As before, MAJOR, MINOR, MICRO,
36 and PATCHLEVEL are numbers, with an absent number equivalent to 0.
37 All versions should be distinguishable purely by those four
40 The STATUS_TAG is purely informational, and lets you know how
41 stable we think the release is: "alpha" is pretty unstable; "rc" is a
42 release candidate; and no tag at all means that we have a final
43 release. If the tag ends with "-cvs" or "-dev", you're looking at a
44 development snapshot that came after a given release. If we *do*
45 encounter two versions that differ only by status tag, we compare them
46 lexically. The STATUS_TAG can't contain whitespace.
48 The EXTRA_INFO is also purely informational, often containing information
49 about the SCM commit this version came from. It is surrounded by parentheses
50 and can't contain whitespace. Unlike the STATUS_TAG this never impacts the way
51 that versions should be compared. EXTRA_INFO may appear any number of
52 times. Tools should generally not parse EXTRA_INFO entries.
54 Now, we start each development branch with (say) 0.1.1.1-alpha. The
55 patchlevel increments consistently as the status tag changes, for
56 example, as in: 0.1.1.2-alpha, 0.1.1.3-alpha, 0.1.1.4-rc, 0.1.1.5-rc.
57 Eventually, we release 0.1.1.6. The next patch release is 0.1.1.7.
59 Between these releases, CVS is versioned with a -cvs tag: after
60 0.1.1.1-alpha comes 0.1.1.1-alpha-cvs, and so on. But starting with
61 0.1.2.1-alpha-dev, we switched to SVN and started using the "-dev"
62 suffix instead of the "-cvs" suffix.
66 Sometimes we need to determine whether a Tor version is obsolete,
67 experimental, or neither, based on a list of recommended versions. The
70 * If a version is listed on the recommended list, then it is
73 * If a version is newer than every recommended version, that version
74 is "experimental" or "new".
76 * If a version is older than every recommended version, it is
79 * The first three components (major,minor,micro) of a version number
80 are its "release series". If a version has other recommended
81 versions with the same release series, and the version is newer
82 than all such recommended versions, but it is not newer than
83 _every_ recommended version, then the version is "new in series".
85 * Finally, if none of the above conditions hold, then the version is