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revlog: skeleton support for version 2 revlogs...
revlog: skeleton support for version 2 revlogs There are a number of improvements we want to make to revlogs that will require a new version - version 2. It is unclear what the full set of improvements will be or when we'll be done with them. What I do know is that the process will likely take longer than a single release, will require input from various stakeholders to evaluate changes, and will have many contentious debates and bikeshedding. It is unrealistic to develop revlog version 2 up front: there are just too many uncertainties that we won't know until things are implemented and experiments are run. Some changes will also be invasive and prone to bit rot, so sitting on dozens of patches is not practical. This commit introduces skeleton support for version 2 revlogs in a way that is flexible and not bound by backwards compatibility concerns. An experimental repo requirement for denoting revlog v2 has been added. The requirement string has a sub-version component to it. This will allow us to declare multiple requirements in the course of developing revlog v2. Whenever we change the in-development revlog v2 format, we can tweak the string, creating a new requirement and locking out old clients. This will allow us to make as many backwards incompatible changes and experiments to revlog v2 as we want. In other words, we can land code and make meaningful progress towards revlog v2 while still maintaining extreme format flexibility up until the point we freeze the format and remove the experimental labels. To enable the new repo requirement, you must supply an experimental and undocumented config option. But not just any boolean flag will do: you need to explicitly use a value that no sane person should ever type. This is an additional guard against enabling revlog v2 on an installation it shouldn't be enabled on. The specific scenario I'm trying to prevent is say a user with a 4.4 client with a frozen format enabling the option but then downgrading to 4.3 and accidentally creating repos with an outdated and unsupported repo format. Requiring a "challenge" string should prevent this. Because the format is not yet finalized and I don't want to take any chances, revlog v2's version is currently 0xDEAD. I figure squatting on a value we're likely never to use as an actual revlog version to mean "internal testing only" is acceptable. And "dead" is easily recognized as something meaningful. There is a bunch of cleanup that is needed before work on revlog v2 begins in earnest. I plan on doing that work once this patch is accepted and we're comfortable with the idea of starting down this path.
Matt Harbison - - Load All Authors

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guids.wxi
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Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 <Include>
<!-- These are component GUIDs used for Mercurial installers.
YOU MUST CHANGE ALL GUIDs below when copying this file
and replace 'Mercurial' in this notice with the name of
your project. Component GUIDs have global namespace! -->
<!-- contrib.wxs -->
Steve Borho
wix: contrib/sample.hgrc is no more
 r22445 <?define contrib.guid = {4E11FFC2-E2F7-482A-8460-9394B5489F02} ?>
Steve Borho
wix: add vim syntax file for Mercurial unit tests
 r12792 <?define contrib.vim.guid = {BB04903A-652D-4C4F-9590-2BD07A2304F2} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828
Steve Borho
wix: switch Mercurial Windows installer to use py2exe --bundle 3...
 r13041 <!-- dist.wxs -->
Steve Borho
wix: move library.zip and all *.pyd into a lib/ folder...
 r25409 <?define dist.guid = {CE405FE6-CD1E-4873-9C9A-7683AE5A3D90} ?>
<?define lib.guid = {91D53B14-E924-432A-ACA2-65F9B3F7C56A} ?>
Steve Borho
wix: switch Mercurial Windows installer to use py2exe --bundle 3...
 r13041
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 <!-- doc.wxs -->
<?define doc.hg.1.html.guid = {AAAA3FDA-EDC5-4220-B59D-D342722358A2} ?>
<?define doc.hgignore.5.html.guid = {AA9118C4-F3A0-4429-A5F4-5A1906B2D67F} ?>
<?define doc.hgrc.5.html = {E0CEA1EB-FA01-408c-844B-EE5965165BAE} ?>
<?define doc.style.css = {172F8262-98E0-4711-BD39-4DAE0D77EF05} ?>
<!-- help.wxs -->
Matt Harbison
wix: add help for current internal topics...
 r27684 <?define help.root.guid = {9FA957DB-6DFE-44f2-AD03-293B2791CF17} ?>
<?define help.internals.guid = {2DD7669D-0DB8-4C39-9806-78E6475E7ACC} ?>
Mads Kiilerich
codingstyle: remove trailing spaces in various text files...
 r19023
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 <!-- i18n.wxs -->
Steve Borho
wix: add phases help text and two more translations (issue 3288)
 r16220 <?define i18nFolder.guid = {1BF8026D-CF7C-4174-AEE6-D6B7BF119248} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828
<!-- templates.wxs -->
Steve Borho
wix: pull in new templates
 r20315 <?define templates.root.guid = {437FD55C-7756-4EA0-87E5-FDBE75DC8595} ?>
<?define templates.atom.guid = {D30E14A5-8AF0-4268-8B00-00BEE9E09E39} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 <?define templates.coal.guid = {B63CCAAB-4EAF-43b4-901E-4BD13F5B78FC} ?>
Steve Borho
wix: pick up new template files
 r17420 <?define templates.gitweb.guid = {827334AF-1EFD-421B-962C-5660A068F612} ?>
Steve Borho
wix: add new json templates folder to MSI installers
 r24989 <?define templates.json.guid = {F535BE7A-EC34-46E0-B9BE-013F3DBAFB19} ?>
Steve Borho
wix: pick up new template files
 r17420 <?define templates.monoblue.guid = {8060A1E4-BD4C-453E-92CB-9536DC44A9E3} ?>
<?define templates.paper.guid = {61AB1DE9-645F-46ED-8AF8-0CF02267FFBB} ?>
Steve Borho
wix: pull in new templates
 r20315 <?define templates.raw.guid = {834DF8D7-9784-43A6-851D-A96CE1B3575B} ?>
<?define templates.rss.guid = {9338FA09-E128-4B1C-B723-1142DBD09E14} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 <?define templates.spartan.guid = {80222625-FA8F-44b1-86CE-1781EF375D09} ?>
Steve Borho
wix: pull in new templates
 r20315 <?define templates.static.guid = {6B3D7C24-98DA-4B67-9F18-35F77357B0B4} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828
Adrian Buehlmann
wix updates...
 r10930 <!-- mercurial.wxs -->
<?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
<?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
<?define ReadMe.guid = {56A8E372-991D-4DCA-B91D-93D775974CF5} ?>
<?define COPYING.guid = {B7801DBA-1C49-4BF4-91AD-33C65F5C7895} ?>
<?define mercurial.rc.guid = {1D5FAEEE-7E6E-43B1-9F7F-802714316B15} ?>
<?define mergetools.rc.guid = {E8A1DC29-FF40-4B5F-BD12-80B9F7BF0CCD} ?>
<?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
Adrian Buehlmann
wix: refactor and new guids.wxi
 r10828 </Include>