* Re: Switching CEDET from CVS to a Distributed VCS. [not found] <1245882173.24086.14.camel@projectile.siege-engine.com> @ 2009-06-24 22:45 ` Lennart Borgman 2009-06-24 23:51 ` Eric M. Ludlam ` (2 more replies) 0 siblings, 3 replies; 17+ messages in thread From: Lennart Borgman @ 2009-06-24 22:45 UTC (permalink / raw) To: Eric M. Ludlam; +Cc: cedet-devel, Emacs-Devel devel Hi Eric, I think I have said it before, but I believe it is worth saying again: Emacs repository will be moved from CVS to Bazaar. And since CEDET is going to be included in Emacs you will most likely be using Bazaar after that. Alex, as I said before I do not know much at all about version control system. However even from my limited understanding of this I still can't find room for arguments for using something else than Bazaar for CEDET. Will not using something else than Bazaar put an extra burdon on Eric? And I guess that is what we all want to avoid ... ;-) I am CC-ing Emacs Devel because there are people who understands this much better than I do. On Thu, Jun 25, 2009 at 12:22 AM, Eric M. Ludlam<eric@siege-engine.com> wrote: > Hi all, > > Alex Ott has been looking into what it would take to move CEDET from > CVS to a distributed version control system, such as GIT or Mercurial. > (Thanks Alex) > > I haven't used these systems myself, but would be happy to learn in > order to make access to CEDET easier. Does anyone have advice on a good > tactic to take? Whatever it is needs to be low maintenance for me, as > I'd rather spend my time hacking Emacs than dealing with VCSes. > > Alex's high level summary is: > > ------------ > Mercurial (http://sourceforge.net/apps/trac/sourceforge/wiki/Mercurial) > we'll have: > + Native support for all platforms - Unix/Windows > + Anonymous access to repository via http > - Less features out of box, comparing with Git, but most of them are > available as extensions, installed separately > > For Git (http://sourceforge.net/apps/trac/sourceforge/wiki/Git) we'll > have: > - Native support for Unixes only, Windows port is slightly limited > - Anonymous access via git protocol - this could make some problems for > users behind firewalls > > all other features seem the same. > ------------ > > Thanks for any input. > Eric > > ------------------------------------------------------------------------------ > _______________________________________________ > Cedet-devel mailing list > Cedet-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/cedet-devel > ------------------------------------------------------------------------------ _______________________________________________ Cedet-devel mailing list Cedet-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/cedet-devel ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-24 22:45 ` Switching CEDET from CVS to a Distributed VCS Lennart Borgman @ 2009-06-24 23:51 ` Eric M. Ludlam 2009-06-25 2:40 ` Miles Bader [not found] ` <393CA42E-4553-4F2D-92D8-F0D3CEE19223@gmail.com> 2 siblings, 0 replies; 17+ messages in thread From: Eric M. Ludlam @ 2009-06-24 23:51 UTC (permalink / raw) To: Lennart Borgman; +Cc: cedet-devel, Emacs-Devel devel Hi Lennart, Thanks for the reminder, as I had forgotten. Anything that makes maintaining the CEDET code in the Emacs repository and my own repository easier will help to help work around the paperwork issues I have to deal with. That would indeed be a big boon for me. I hadn't acted on these suggestions in the past because my Linux distro had been so old and I was too lazy to build whatever vcs was suggested myself. Now that I've upgraded, this is no longer an issue. Thanks Eric On Thu, 2009-06-25 at 00:45 +0200, Lennart Borgman wrote: > Hi Eric, > > I think I have said it before, but I believe it is worth saying again: > Emacs repository will be moved from CVS to Bazaar. And since CEDET is > going to be included in Emacs you will most likely be using Bazaar > after that. > > Alex, as I said before I do not know much at all about version control > system. However even from my limited understanding of this I still > can't find room for arguments for using something else than Bazaar for > CEDET. Will not using something else than Bazaar put an extra burdon > on Eric? And I guess that is what we all want to avoid ... ;-) > > I am CC-ing Emacs Devel because there are people who understands this > much better than I do. > > > > On Thu, Jun 25, 2009 at 12:22 AM, Eric M. Ludlam<eric@siege-engine.com> wrote: > > Hi all, > > > > Alex Ott has been looking into what it would take to move CEDET from > > CVS to a distributed version control system, such as GIT or Mercurial. > > (Thanks Alex) > > > > I haven't used these systems myself, but would be happy to learn in > > order to make access to CEDET easier. Does anyone have advice on a good > > tactic to take? Whatever it is needs to be low maintenance for me, as > > I'd rather spend my time hacking Emacs than dealing with VCSes. > > > > Alex's high level summary is: > > > > ------------ > > Mercurial (http://sourceforge.net/apps/trac/sourceforge/wiki/Mercurial) > > we'll have: > > + Native support for all platforms - Unix/Windows > > + Anonymous access to repository via http > > - Less features out of box, comparing with Git, but most of them are > > available as extensions, installed separately > > > > For Git (http://sourceforge.net/apps/trac/sourceforge/wiki/Git) we'll > > have: > > - Native support for Unixes only, Windows port is slightly limited > > - Anonymous access via git protocol - this could make some problems for > > users behind firewalls > > > > all other features seem the same. > > ------------ > > > > Thanks for any input. > > Eric > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Cedet-devel mailing list > > Cedet-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/cedet-devel > > ------------------------------------------------------------------------------ ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-24 22:45 ` Switching CEDET from CVS to a Distributed VCS Lennart Borgman 2009-06-24 23:51 ` Eric M. Ludlam @ 2009-06-25 2:40 ` Miles Bader 2009-06-25 13:52 ` David Bernard 2009-06-25 17:48 ` Stephen J. Turnbull [not found] ` <393CA42E-4553-4F2D-92D8-F0D3CEE19223@gmail.com> 2 siblings, 2 replies; 17+ messages in thread From: Miles Bader @ 2009-06-25 2:40 UTC (permalink / raw) To: Lennart Borgman; +Cc: cedet-devel, Emacs-Devel devel, Eric M. Ludlam Lennart Borgman <lennart.borgman@gmail.com> writes: > Alex, as I said before I do not know much at all about version control > system. However even from my limited understanding of this I still > can't find room for arguments for using something else than Bazaar for > CEDET. Will not using something else than Bazaar put an extra burdon > on Eric? Sure, although if say git were sufficiently better than bazaar, that might be offset by a more pleasant time when actually developing the project. I personally use git locally even when upstream uses some other VCS, simply because it's much, much, better than them, and the annoyance of the extra syncing step is offset by far more facile operation for the bulk of my development work (merging/syncing consumes a relatively small proportion of my "VCS time"). [When emacs switches to bazaar, I'll probably try to find a git/bazaar gateway so I can use git locally.] Bazaar is, mostly likely, better than CVS however. -Miles -- Justice, n. A commodity which in a more or less adulterated condition the State sells to the citizen as a reward for his allegiance, taxes and personal service. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-25 2:40 ` Miles Bader @ 2009-06-25 13:52 ` David Bernard 2009-06-25 16:04 ` [CEDET-devel] " Davi Diaz 2009-06-25 17:48 ` Stephen J. Turnbull 1 sibling, 1 reply; 17+ messages in thread From: David Bernard @ 2009-06-25 13:52 UTC (permalink / raw) To: Miles Bader; +Cc: cedet-devel, Eric M. Ludlam, Emacs-Devel devel [-- Attachment #1.1: Type: text/plain, Size: 2923 bytes --] Hi, If you choose git. I suggest to use http://github.com to host a "central" version : * provide documentation for newbee (step by step to create your project,...) * an interesting feature : ** "committers" could easily work on branch ** non-committers could easily fork project in there own space and propose patch/branch,... * ... Than using git or mercurial on sourceforge. One year ago, I request the List project to move from subversion (hosted by google) to DVCS (I used mercurial at work (choose by me 1.5 years ago)), without success but after a discussion and an overview of github the lead start learning git an move the project to github. I use mercurial day to day at office and git/github for my oss project. IMHO : the main difference are : * mercurial works on Windows (easily) * git manage named branches (at office we decided to use 2 mercurial repositories to manage project (wip and release) instead of 2 branches, because working with branches in mercurial is more error prone) second level differences : * git allow you to keep changes from an other repository without required that your repository is full commited (no pending changes). mercurial need extension to provide similar job * git could compress/strip history my 2cents (I'm not a CEDET nor emacs contributor) note : on github, projects are not group by "projects" but by owner, eg: my own http://github.com/davidB On Thu, Jun 25, 2009 at 04:40, Miles Bader <miles@gnu.org> wrote: > Lennart Borgman <lennart.borgman@gmail.com> writes: > > Alex, as I said before I do not know much at all about version control > > system. However even from my limited understanding of this I still > > can't find room for arguments for using something else than Bazaar for > > CEDET. Will not using something else than Bazaar put an extra burdon > > on Eric? > > Sure, although if say git were sufficiently better than bazaar, that > might be offset by a more pleasant time when actually developing the > project. I personally use git locally even when upstream uses some > other VCS, simply because it's much, much, better than them, and the > annoyance of the extra syncing step is offset by far more facile > operation for the bulk of my development work (merging/syncing > consumes a relatively small proportion of my "VCS time"). > > [When emacs switches to bazaar, I'll probably try to find a git/bazaar > gateway so I can use git locally.] > > Bazaar is, mostly likely, better than CVS however. > > -Miles > > -- > Justice, n. A commodity which in a more or less adulterated condition the > State sells to the citizen as a reward for his allegiance, taxes and > personal > service. > > > ------------------------------------------------------------------------------ > _______________________________________________ > Cedet-devel mailing list > Cedet-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/cedet-devel > [-- Attachment #1.2: Type: text/html, Size: 3784 bytes --] [-- Attachment #2: Type: text/plain, Size: 79 bytes --] ------------------------------------------------------------------------------ [-- Attachment #3: Type: text/plain, Size: 164 bytes --] _______________________________________________ Cedet-devel mailing list Cedet-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/cedet-devel ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [CEDET-devel] Switching CEDET from CVS to a Distributed VCS. 2009-06-25 13:52 ` David Bernard @ 2009-06-25 16:04 ` Davi Diaz 2009-06-26 0:09 ` Miles Bader 0 siblings, 1 reply; 17+ messages in thread From: Davi Diaz @ 2009-06-25 16:04 UTC (permalink / raw) To: emacs-devel Cc: David Bernard, cedet-devel, Eric M. Ludlam, Lennart Borgman, Miles Bader David Bernard wrote: > If you choose git. I suggest to use http://github.com to host > a "central" version: Savannah is a lot quicker than github. http://savannah.gnu.org/ And Savannah is here to support Free Software. It is not a business as github.com is. See http://github.com/plans Of course Emacs is at Savannah. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [CEDET-devel] Switching CEDET from CVS to a Distributed VCS. 2009-06-25 16:04 ` [CEDET-devel] " Davi Diaz @ 2009-06-26 0:09 ` Miles Bader 0 siblings, 0 replies; 17+ messages in thread From: Miles Bader @ 2009-06-26 0:09 UTC (permalink / raw) To: emacs-devel Davi Diaz <davi@leals.com> writes: >> If you choose git. I suggest to use http://github.com to host >> a "central" version: > > Savannah is a lot quicker than github. > > http://savannah.gnu.org/ > > And Savannah is here to support Free Software. It is not a business as > github.com is. See http://github.com/plans Github is a decent site (tho I dislike their super-glossy-but-flaky UI) for small projects, but I get more warm fuzzies from being on savannah, and feel a bit more confident that savannah will be around in the future. The initial application to savannah is more involved, and you need to meet their requirements (CEDET almost certainly does, of course), but everything works quite well after that. I think being on savannah also lends more of an "official" air. If I see a download is from savannah -- even if it's on nongnu -- it adds a degree of trust. At the least, I know the source code was vetted to _some_ degree before the initial upload. -Miles -- Opportunity, n. A favorable occasion for grasping a disappointment. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-25 2:40 ` Miles Bader 2009-06-25 13:52 ` David Bernard @ 2009-06-25 17:48 ` Stephen J. Turnbull 2009-06-25 18:24 ` David Reitter 1 sibling, 1 reply; 17+ messages in thread From: Stephen J. Turnbull @ 2009-06-25 17:48 UTC (permalink / raw) To: Miles Bader Cc: cedet-devel, Eric M. Ludlam, Lennart Borgman, Emacs-Devel devel Miles Bader writes: > Bazaar is, mostly likely, better than CVS however. I believe Bazaar now supports fastimport format in both directions. Interaction between git and Bazaar probably means you lose/munge VCS-specific metadata (Bazaar cares about revision numbers while git doesn't support them at all, and the revision ID formats are timestamp-specific in each VCS, so converting those in a roundtrippable way would require great care) in each direction, but with minimal care you should be able to preserve the history dag and core meta data (author information). ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-25 17:48 ` Stephen J. Turnbull @ 2009-06-25 18:24 ` David Reitter 2009-06-28 6:17 ` Stephen J. Turnbull 0 siblings, 1 reply; 17+ messages in thread From: David Reitter @ 2009-06-25 18:24 UTC (permalink / raw) To: Stephen J. Turnbull; +Cc: Emacs-Devel devel On Jun 25, 2009, at 1:48 PM, Stephen J. Turnbull wrote: > I believe Bazaar now supports fastimport format in both directions. > > Interaction between git and Bazaar probably means you lose/munge > VCS-specific metadata (Bazaar cares about revision numbers while git > doesn't support them at all, and the revision ID formats are > timestamp-specific in each VCS, so converting those in a > roundtrippable way would require great care) in each direction, but > with minimal care you should be able to preserve the history dag and > core meta data (author information). fast-import (bzr->git at least) keeps an index to facilitate fast incremental exports. Suppose one has a commit in the git repo to be committed to the Bzr repo, would it be possible to 1. convert a git patch (git-format-patch) to a Bazaar merge directive? 2. use fast-import/export to export just the patch? ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-25 18:24 ` David Reitter @ 2009-06-28 6:17 ` Stephen J. Turnbull 2009-06-28 11:45 ` David Reitter 0 siblings, 1 reply; 17+ messages in thread From: Stephen J. Turnbull @ 2009-06-28 6:17 UTC (permalink / raw) To: David Reitter; +Cc: Emacs-Devel devel David Reitter writes: > On Jun 25, 2009, at 1:48 PM, Stephen J. Turnbull wrote: > > I believe Bazaar now supports fastimport format in both directions. > > > > Interaction between git and Bazaar probably means you lose/munge > > VCS-specific metadata (Bazaar cares about revision numbers while git > > doesn't support them at all, and the revision ID formats are > > timestamp-specific in each VCS, so converting those in a > > roundtrippable way would require great care) in each direction, but > > with minimal care you should be able to preserve the history dag and > > core meta data (author information). > > fast-import (bzr->git at least) keeps an index to facilitate fast > incremental exports. > Suppose one has a commit in the git repo to be committed to the Bzr > repo, would it be possible to > > 1. convert a git patch (git-format-patch) to a Bazaar merge directive? This is software, anything's possible. Useful? Probably not. I don't see why you'd want to do anything other than maintain pairs of bzr-git bidi mirrored branches. In particular, merge directives are most useful if you have a formal review process and a patch queue manager such as Bundle Buggy or PQM. That's just so not Emacs. Emacs has committers, not reviewers. Maybe CEDET has a more formal process, but you still wouldn't want to use merge directives without automatic help AFAICS. > 2. use fast-import/export to export just the patch? I really don't see why you'd want to do this. "Just patches" makes a lot of sense if your name is Andrew Morton. (Not necessarily literally, but someone whose mission in life is managing such a patch-based workflow.) Agreed, compared to ideal, or even to git, bzr's performance sucks, even after a 500% or so speed up in certain operations. But realistically, it's usable, unless you want to hang `(shell-command "$VCS commit -a -m autocommit;$VCS log -10")' on your save-buffer-hook as I do. What bzr cannot do very well that git excels at is editing history. bzr is a FORTRAN derivative. For all practical purposes, unless you're a bzr.dev, history is a linear array in each branch. Unless you really really know what you're doing, you don't want to do anything but work linearly in each branch, and occasionally merge to mainline. But guess what? Most people just want to work linearly in each branch, and occasionally merge to mainline. I see no problem here, do you? git is a LISP derivative. If you are comfortable with cons, setcdr, and mapcar, then you will be comfortable with git-commit, git-rebase, and git-filter-branch. And you will feel the power. But hey, every minute you spend playing with git is a minute you're not hacking Emacs. Is it worth it? Seriously, if you're a git aficianado, set up the bidirectional mirror, create a pushthrough script that pushes from the git repo to the local bzr repo, and on from the local bzr repo to Emacs Central, and (my best guess) be happy. If you then find you're not happy yet, *then* it's time to discuss these optimizations. Both git and bzr are flexible enough that you can be confident of finding ways to streamline later if it's necessary. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-28 6:17 ` Stephen J. Turnbull @ 2009-06-28 11:45 ` David Reitter 2009-06-28 14:04 ` Stephen J. Turnbull 0 siblings, 1 reply; 17+ messages in thread From: David Reitter @ 2009-06-28 11:45 UTC (permalink / raw) To: Stephen J. Turnbull; +Cc: Emacs-Devel devel On Jun 28, 2009, at 2:17 AM, Stephen J. Turnbull wrote: >> 1. convert a git patch (git-format-patch) to a Bazaar merge >> directive? > > This is software, anything's possible. I looked into it and it's fairly easy to do. It would be for local use rather than for review by e-mail. > Useful? Probably not. I > don't see why you'd want to do anything other than maintain pairs of > bzr-git bidi mirrored branches. > Seriously, if you're a git aficianado, set up the bidirectional > mirror, create a pushthrough script that pushes from the git repo to > the local bzr repo, and on from the local bzr repo to Emacs Central, > and (my best guess) be happy. This would be the ideal case and very, very convenient. I hope there will be such a mirror [on savannah if possible], but I'm not sure how it would handle merge failures, assuming that this sync script runs periodically and without user intervention. The more frequently the git mirror is updated, the less likely it is that a git->bzr merge fails. If it does fail, I'm not sure how to handle it well. That's why I didn't pursue the idea so far. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-28 11:45 ` David Reitter @ 2009-06-28 14:04 ` Stephen J. Turnbull 2009-06-28 14:29 ` David Reitter 0 siblings, 1 reply; 17+ messages in thread From: Stephen J. Turnbull @ 2009-06-28 14:04 UTC (permalink / raw) To: David Reitter; +Cc: Emacs-Devel devel David Reitter writes: > On Jun 28, 2009, at 2:17 AM, Stephen J. Turnbull wrote: > > >> 1. convert a git patch (git-format-patch) to a Bazaar merge > >> directive? > > > > This is software, anything's possible. > > I looked into it and it's fairly easy to do. It would be for local > use rather than for review by e-mail. Instead of parsing the patch and/or log for meta data, applying the patch and committing with "bzr commit"? That's creative. Good idea, and good luck with it, it deserves a try. > > Useful? Probably not. OK, I retract that.<wink> > > Seriously, if you're a git aficianado, set up the bidirectional > > mirror, create a pushthrough script that pushes from the git repo to > > the local bzr repo, and on from the local bzr repo to Emacs Central, > > and (my best guess) be happy. > > This would be the ideal case and very, very convenient. I hope there > will be such a mirror [on savannah if possible], This would be an amazing time sink for the Savannah people, is my guess. Not a good idea -- a lot of people would use it and conflicts would be frequent, I think. The extra bzr repos will stay way under 1GiB for the forseeable future, it's just not a big deal to keep them locally. Savannah should maintain the official format, period. In theory you could use incremental fastimport format as a wire protocol, but I wouldn't want to try that without core support from the bzr devs. Given how much effort they put into protocol and format proliferation, I doubt they'd be happy to restrict themselves to a simple NIH protocol. > but I'm not sure how it would handle merge failures, assuming that > this sync script runs periodically and without user intervention. If it runs locally on your box while you're not working, it should rarely have bad conflicts, and you should be able to resolve them manually without trouble. > The more frequently the git mirror is updated, the less likely it > is that a git->bzr merge fails. If it does fail, I'm not sure how > to handle it well. That's why I didn't pursue the idea so far. The git->bzr pushthrough script would try to do a bzr->git merge first, of course. You want *all* failures to happen in your local git repository because that's where you want to deal with amending commits and similar history manipulations. If that doesn't excite you, learn to use bzr. Trying to maintain bidirectional synchronization is going to drive somebody crazy. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-28 14:04 ` Stephen J. Turnbull @ 2009-06-28 14:29 ` David Reitter 2009-06-29 23:19 ` Stephen J. Turnbull 0 siblings, 1 reply; 17+ messages in thread From: David Reitter @ 2009-06-28 14:29 UTC (permalink / raw) To: Stephen J. Turnbull; +Cc: Emacs-Devel devel On Jun 28, 2009, at 10:04 AM, Stephen J. Turnbull wrote: > Instead of parsing the patch and/or log for meta data, applying the > patch and committing with "bzr commit"? That's creative. Good idea, > and good luck with it, it deserves a try. git-mailinfo exposes the functions to parse a patch into commit message and patch. You get the usual meta data as well. > This would be an amazing time sink for the Savannah people, is my > guess. Not a good idea -- a lot of people would use it and conflicts > would be frequent, I think. Point well taken. Still, Savannah already has an excellent git mirror. > In theory you could use incremental fastimport format as a wire > protocol, but I wouldn't want to try that without core support from > the bzr devs. Yes. Just worried about automatically creating and pushing very bad revisions. > > The git->bzr pushthrough script would try to do a bzr->git merge > first, of course. I was hoping that all that will remain outsourced, as it is now. I've had plenty of bad experiences with importing (CVS mostly) into bzr; perhaps the route bzr->git is easier, but a working and safe two-way sync.. . Like you say: > Trying to maintain bidirectional synchronization is going > to drive somebody crazy. For this reason I was wondering if the patch-bundle route would be a clean way to push stuff to bzr. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-28 14:29 ` David Reitter @ 2009-06-29 23:19 ` Stephen J. Turnbull 2009-06-30 0:16 ` David Reitter 0 siblings, 1 reply; 17+ messages in thread From: Stephen J. Turnbull @ 2009-06-29 23:19 UTC (permalink / raw) To: David Reitter; +Cc: Emacs-Devel devel David Reitter writes: > On Jun 28, 2009, at 10:04 AM, Stephen J. Turnbull wrote: > > This would be an amazing time sink for the Savannah people, is my > > guess. Not a good idea -- a lot of people would use it and conflicts > > would be frequent, I think. > > Point well taken. Still, Savannah already has an excellent git mirror. I suppose they could keep it running pretty cheaply. IMO it's mission creep, and Savannah doesn't need mission creep, they have enough trouble just staying up. > I was hoping that all that will remain outsourced, as it is now. I've > had plenty of bad experiences with importing (CVS mostly) into bzr; Simply importing CVS is horrible because commits are non-atomic and lack much necessary metadata to reconstruct commits and branching events reliably. Experience with CVS doesn't even extrapolate to SVN, let alone bzr, git, and hg. > > Trying to maintain bidirectional synchronization is going > > to drive somebody crazy. > > For this reason I was wondering if the patch-bundle route would be a > clean way to push stuff to bzr. No. Why do you think it would be any better than anything else? Once you've got atomic commits, the rest of the issues are "what metadata does your VCS record?" which are pretty similar for the VCSes under consideration, and genuine conflicts, which have to be resolved somewhere. VCSes aren't magic; when you and I make different changes to the same line of code, some human has to sort that out. The problem with bidirectional mirrors is that humans are "supposed" to be out of the loop at the point where genuine conflict occurs. Unidirectional mirrors don't face this problem, and with a local bidi mirror, responsibility for the problem is clear and equal to the person who will experience damage/inconvenience. ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: Switching CEDET from CVS to a Distributed VCS. 2009-06-29 23:19 ` Stephen J. Turnbull @ 2009-06-30 0:16 ` David Reitter 0 siblings, 0 replies; 17+ messages in thread From: David Reitter @ 2009-06-30 0:16 UTC (permalink / raw) To: Stephen J. Turnbull; +Cc: Emacs-Devel devel On Jun 29, 2009, at 7:19 PM, Stephen J. Turnbull wrote: >> For this reason I was wondering if the patch-bundle route would be a >> clean way to push stuff to bzr. > > No. Why do you think it would be any better than anything else? Once > you've got atomic commits, the rest of the issues are "what metadata > does your VCS record?" which are pretty similar for the VCSes under > consideration, and genuine conflicts, which have to be resolved > somewhere. VCSes aren't magic; when you and I make different changes > to the same line of code, some human has to sort that out. > > The problem with bidirectional mirrors is that humans are "supposed" > to be out of the loop at the point where genuine conflict occurs. > Unidirectional mirrors don't face this problem, and with a local bidi > mirror, responsibility for the problem is clear and equal to the > person who will experience damage/inconvenience. Well, that's precisely why I suggested the patch-bundle method in the first place - it would be local. I would probably implement a script that does this, if someone else provides a working (read-only) git mirror of the bzr repository. ^ permalink raw reply [flat|nested] 17+ messages in thread
[parent not found: <393CA42E-4553-4F2D-92D8-F0D3CEE19223@gmail.com>]
* Re: [CEDET-devel] Switching CEDET from CVS to a Distributed VCS. [not found] ` <393CA42E-4553-4F2D-92D8-F0D3CEE19223@gmail.com> @ 2009-06-25 8:44 ` Lennart Borgman 2009-06-25 12:53 ` Stefan Monnier 2009-06-25 13:19 ` David Reitter 0 siblings, 2 replies; 17+ messages in thread From: Lennart Borgman @ 2009-06-25 8:44 UTC (permalink / raw) To: David Reitter; +Cc: Emacs-Devel devel, Eric M. Ludlam On Thu, Jun 25, 2009 at 5:23 AM, David Reitter<david.reitter@gmail.com> wrote: > On Jun 24, 2009, at 6:45 PM, Lennart Borgman wrote: > >> Hi Eric, >> >> I think I have said it before, but I believe it is worth saying again: >> Emacs repository will be moved from CVS to Bazaar. And since CEDET is >> going to be included in Emacs you will most likely be using Bazaar >> after that. >> >> Alex, as I said before I do not know much at all about version control >> system. However even from my limited understanding of this I still >> can't find room for arguments for using something else than Bazaar for >> CEDET. Will not using something else than Bazaar put an extra burdon >> on Eric? And I guess that is what we all want to avoid ... ;-) > > If it helps others over at Cedet: > > I evaluated Bazaar over the course of 6 months for Aquamacs (which > incorporates the full Emacs repository). Using Bazaar with this repository > (and coming up with a workable conversion of Aquamacs and Emacs CVSes) was > endless pain, frustration and bug reporting (starting with cryptic error > messages from the bowels of Bzr). > > Bzr is well-meant and its UI is well-designed, but it lacks the efficiency > and reliability to manage a repository with >100k revisions. It lacks a > quality assurance process (with its monthly release cycle that's difficult) > and reliable error signaling / integrity checking (its ever-changing > repository formats are not seamless at all w.r.t. transitions). It is > dog-slow with a large repository, even with the latest changes to "bzr log". Thanks David, hope you do not mind I am sending this along to Emacs Devel. Are these problems still there? In that case they might be very important for the time scale when switching Emacs to using Bazaar. > Git has been painless and elegant. Nothing gets in your way. > > All that said, I tried very hard to make Bzr work for us and spent a lot of > time dealing with bugs, precisely for the reasons that Lennart stated. > > For a smaller repository, Bzr may well work, especially if you don't import > a "messed up" CVS repo with many branches. > > (Otherwise, it seems that a lot of Emacs dev's use Git to manage their work > privately before transferring their changes into the Emacs repository.) ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [CEDET-devel] Switching CEDET from CVS to a Distributed VCS. 2009-06-25 8:44 ` [CEDET-devel] " Lennart Borgman @ 2009-06-25 12:53 ` Stefan Monnier 2009-06-25 13:19 ` David Reitter 1 sibling, 0 replies; 17+ messages in thread From: Stefan Monnier @ 2009-06-25 12:53 UTC (permalink / raw) To: Lennart Borgman; +Cc: David Reitter, Eric M. Ludlam, Emacs-Devel devel > Are these problems still there? In that case they might be very > important for the time scale when switching Emacs to using Bazaar. Please just stop this discussion. The only useful thing to do at this point is to help move from CVS to Bazaar. Stefan ^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [CEDET-devel] Switching CEDET from CVS to a Distributed VCS. 2009-06-25 8:44 ` [CEDET-devel] " Lennart Borgman 2009-06-25 12:53 ` Stefan Monnier @ 2009-06-25 13:19 ` David Reitter 1 sibling, 0 replies; 17+ messages in thread From: David Reitter @ 2009-06-25 13:19 UTC (permalink / raw) To: Lennart Borgman, Emacs-Devel devel; +Cc: Eric M. Ludlam On Jun 25, 2009, at 4:44 AM, Lennart Borgman wrote: > Thanks David, hope you do not mind I am sending this along to Emacs > Devel. > > Are these problems still there? In that case they might be very > important for the time scale when switching Emacs to using Bazaar. Please disregard my forwarded message. It was intended to be private. While I have a technical opinion as a result from evaluating the software, I would be the last one to voice it publicly in this way when it could discourage developers of a free, well-intentioned, commendable effort like Bazaar, who have shown friendly responsiveness and professionalism on their mailing list in the past. Let's be outspoken in private and/or whenever it serves a purpose. The decision for Emacs has been made and other, related projects and developers may now either live with it or work around it (see also Miles' message). In fact if there are some fellow Git users, perhaps one could exchange Git/Bzr integration strategies by e-mail. Drop me a line and I will bring people together to coordinate. ^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2009-06-30 0:16 UTC | newest] Thread overview: 17+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- [not found] <1245882173.24086.14.camel@projectile.siege-engine.com> 2009-06-24 22:45 ` Switching CEDET from CVS to a Distributed VCS Lennart Borgman 2009-06-24 23:51 ` Eric M. Ludlam 2009-06-25 2:40 ` Miles Bader 2009-06-25 13:52 ` David Bernard 2009-06-25 16:04 ` [CEDET-devel] " Davi Diaz 2009-06-26 0:09 ` Miles Bader 2009-06-25 17:48 ` Stephen J. Turnbull 2009-06-25 18:24 ` David Reitter 2009-06-28 6:17 ` Stephen J. Turnbull 2009-06-28 11:45 ` David Reitter 2009-06-28 14:04 ` Stephen J. Turnbull 2009-06-28 14:29 ` David Reitter 2009-06-29 23:19 ` Stephen J. Turnbull 2009-06-30 0:16 ` David Reitter [not found] ` <393CA42E-4553-4F2D-92D8-F0D3CEE19223@gmail.com> 2009-06-25 8:44 ` [CEDET-devel] " Lennart Borgman 2009-06-25 12:53 ` Stefan Monnier 2009-06-25 13:19 ` David Reitter
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