Revision as of 19:46, 8 March 2010
This is the page for co-ordinating KDE's move to Git.
If you're interested in helping, you should join the email@example.com mailinglist and #kde-git on freenode.
Meetings are wednesdays, 19:30 UTC, in #kde-git.
KDE is, eventually, moving to Git. We will be using gitorious.org servers, with funding from Nokia. We will also have our own mirrors using existing KDE servers.
We are working with the Gitorious people to ensure their server will meet all our needs as well as everyone's privacy requirements. The distributed nature of Git will make it easy for us to migrate off gitorious.org at any time should the need arise (but that's unlikely :).
In the summer of 2009, Amarok moved to Gitorious to test the waters and find problems that would affect KDE. Once those problems have been solved, all of KDE will be able to switch.
Git offers many advantages over svn, including offline commits and much easier to keep a feature branch up-to-date. Many KDE developers are already using git-svn, but this tool has its limitations. We want to have the full power of Git available, and we have people willing to do the work necessary to migrate.
When we move, KDE's svn repository will be migrated into several Git repos, all on gitorious.org. Main modules such as kdelibs and kdebase will each become one repository. Projects in extragear will each have their own repository. The kde.gitorious.org site will have a list (lists?) of all these repositories using the builtin project wiki. Scripts will be provided for downloading, say, all of extragear, so "moving" a project from kdereview to extragear would simply involve editing a file kept online that defined the location of projects.
A few things will stay in subversion - currently websites, translations and manuals. It's possible they could move to Git later, but they won't be part of the mass migration.
On Gitorious, all KDE developers will be part of the kde-developers group. Developers in this group are required to set their "full name" for their Gitorious account to their real name. If you want to be in this group, file a bugreport for sysadmin on bugs.kde.org. :)
The procedure to move a project from svn to gitorious.org can be found in Steps to follow for Moving.
Tasks that need to get done before we can migrate
SLA for gitorious.org
Owner: aseigo, frank
Status: Progressing well; will take a while
- The SLA terms need to be documented as well as who will be footing the bill, if any. TZander has talked to Shortcut AS and sent the relevant information (eg cost) to the KDE eV board.
- aseigo and Frank (and someone?) had a meeting with Shortcut people during tokamak. They asked for a rather large sum of money; negotiations are continuing, but we might want to consider hosting our own server...
Write / update importing rules for svn2git
Owner: see below - volunteers needed!
Status: sandsmark: stuck on a svn2git bug. sho: ???, tumaix:started to read the docs, cryos: getting started [2010-01-06]
- The importer is on gitorious.org as svn2git we have a set of rules to tell the importer what svn dirs turn into which git repos and those need constant updating whenever a new branch or tag or project is created. Currently the rules are mostly a rough draft, as seen by the large amount of rule-editing that had to be done for Konversation and Amarok. This has not been done for quite some time and so someone should rsync the svn repo run svn2git and fix the rules and importer whenever the import stops.
- This is a very big task, too big for one person; it's probably best to tackle it one module at a time
- To get started on a module, read Using Svn2Git
- TZander has done the koffice ruleset as of 2009-01-06
- Jpwhiting has finished (more or less) the kdeaccessibility ruleset 2010-01-24.
- aavci has done the k3b ruleset as of 2010-01-27
||"more or less"?
||Just getting started Help needed.
||Just getting started Help needed.
|| Misses history from KDE3.3 and older (KDevelop3.2), probably something with layout-changes, might need recurse-action but don't know how to do it.
|| done, all tags seem fine all branches are there
||expand the *'s later (let's focus on the base modules first)
||All but tags are done
Requirements of KDEPIM and KDAB
Owner: till (To be reassigned)
Status: Requirements of tools and for workflow identified. Someone from KDAB will be nominated to co-ordinate and communicate specific requirements
Summary of issues
- Branch maintenance workflow
- KDAB maintains several branches of legacy versions of KDE for enterprise customer deployments. Enterprise 3.5 Enterprise 4 (based on KDE 4.2). The current KDEPIM trunk known as Enterprise 5 and is Akonadi based.
- Periodically (weekly or so), tags are created from the enterprise branches with bugfixes. http://websvn.kde.org:80/tags/kdepim/ Customers can download the tagged versions with the latest updates. Fixes are merged from the Enterprise 3.5 branch, and into trunk (which sometimes involves a lot of work, as the fix must be ported to Akonadi). Additionally, fixes get merged in the other direction. From official KDE modules into the Enterprise branches.
- Some fixes from Enterprise 3.5 should not be merged into Enterprise 4 for reasons such as no longer being reproducible. Some fixes do not get merged for a long time because they require so much work that porting the fix or feature is deffered. There needs to be a list of commits which should never be merged (blocked commits), and commits which should be merged, but have not been merged yet. The tool svnmerge is used to facilitate this. svnmerge uses svn properties to maintain lists of commits that are blocked and that have already been integrated. See for example the svn-blocked and svn-integrated properties here: http://websvn.kde.org:80/trunk/KDE/kdepim/. The lists of commits available to be merged into the various branches are here: http://www.kdab.com/~thomas/avail/
- There needs to be a way in git to keep track of what commits have been merged, what commits need to be merged, and what commits are blocked. There needs to be a way of merging only specific commits from a branch, but not all, and not blocked commits. Proposed solutions:
- git cherry-pick allows 'merging' of individual commits, but does not record where the commits came from. Instead it creates a new commit without any reference to where it came from. This alone is unsuitable.
- branch per fix. This would lead to an explosion of branches which is not a problem in git as all commits are branches. It may make gitk un-navigatable. There would need to be a naming convention such as komo-merge-<fixname> for branches which should be merged. The commands git checkout 4.5 && git merge $(git branch -a | grep -E ^origin/komo-merge) and git checkout enterprise4.5 && git merge $(git branch -a | grep -E ^origin/komo-merge) and git checkout master && git merge $(git branch -a | grep -E ^origin/komo-merge). That could of course be optimized, but gets the point across. If the code has changed so much that the branch is unmergable, but the fix still needs to be in trunk, the system breaks down.
- Custom git command with flat text files representing the same information as svnmerge, that is lists of blocked and integrated commits. This is most likely to be a workable solution, possibly together with conventional branch naming.
- Clean slate
- The existing backlog of commits which need to be merged or ported to trunk needs to be empty before the change to git so that nothing gets lost. This is a lot of work and will take time.
- Internal Tools and external customer tools and workflows
- KDAB is a consumer of KDE software, but also has downstream customers fetching software from where it is developed. That is, KDE SVN. For example packages are created from the tags in tags/kdepim. Some of these downstreams are less close to KDE and depend on current workflows. If KDE SVN is not the place to get those updates anymore, this needs to be communicated to those downstreams, and the tools updated.
- People who don't currently know how to use git need to get familiar with it so that transitioning will be nearly seamless, and not result in too much development slowdown.
- Other commitments
- Project deadlines and other commitments prevent the possiblity of blocking off time to work on git migration when so many other things need to be done which have milestones separate to KDE cycles. The required work to convert to git can't be prioritized as highly, and so will take more time.
- Technical difficulties and limitations.
- Up to KDE 3.5 there was one kdepim module. For the KDE4 cycle, this was split into kdepimlibs and kdepim. For the above mentioned merging to be possible, it makes sense for both to be in the same git module. This poses extra difficulty to the svn2git script.
Nice to have before the migration
Status: argonel had a hd failure :( [2010-01-06]
- Gitorious records who pushed each commit. This is useful information because commits themselves can say anything, and there are legitimate reasons to push commits with another person's name.
- Internally, Gitorious stores this information in an SQL database, and the information is viewable through the web interface. However we want a way to backup this information for the case that Gitorious suddenly go offline.
- quotes from the mailing list:
> How about every repo has, by convention, a "commits" branch and
> a post commit hook that ensures whatever meta info is required,
> however it can be gleaned, is also checked into that commits branch.
> A bit like how gitosis uses a repo to store auth/acl info to help
> manage the other repos.
That's exactly my idea. And of course it won't be named commits, because we're
not talking about commits.
It's a push log, similar to a local repository's reflog.
For every push, log:
- who pushed (not the Unix username, which will be "git")
- which branch heads changed (what from, what to)
- which tags were created
- the state of all other branches and tags
Just use git commit-tree with the empty tree and save everything in the commit
message, one after the other.
This does not require help from gitorious.org until the script is actually written: it's just another pre-receive hook for them to install on their servers.
it *might* also be possible to run it as a post-receive hook (in which case we can do the whole thing ourselves).
if we self-host, then we won't need this.
Script for downloading virtual KDE hierarchies
- Let's start over on this.
what we already have: two build scripts for kde; kdesvn-build and build-tool.
what we want: an easy way for people to get large chunks of kde, without thinking about what urls the repos come from or having to look things up.
do kde-svnbuild and build-tool satisfy this well enough?
or do we want a computer-readable file listing all the repos too?
btw, scripty has its own list of repos already. it's just in a rather weird bash file.
Owner: volunteers needed!!
- Line endings and encodings
this got accidentally marked as done or something, but it's not.
> > As for line-endings, be careful because Git is different from Subversion.
> different how?
Just ensure that all files are stored as LF only, except if there's a
.gitattributes file saying "-crlf" (i.e., allow it to have CRLF).
Snapshot to read-only svn
- It's work, but maybe some people would like it. NEEDED for documentation, in order to get it back into SVN for the translators/scripty/?
- Could be done with a git-svn gateway presumably? -Mike Arthur 19/10/2009 16:04
- if we leave the docbook stuff in svn, we can avoid this a bit longer. --Chani 23:21, 12 November 2009 (UTC)
Owner: Chani, greeneg, - please help out!
- At least minimal documentation about how to checkout, how to get a Gitorious account, how to request a merge needed, other git documentation and links to other git information would be very useful also.
- see the Git Tutorial Page. help wanted!!
Setup git mirrors for cloning
Owner: No one (help!)
- Re-purpose the anonsvn servers. This item might be a blocker.
Local pre-commit hooks
- A set of recommended local hooks that give useful warnings could be nice to have.
...on the other hand, if we get a lot of bikeshedding about what hooks, then it won't be so nice. so I'd put this in the "very optional" pile. --Chani 19:10, 16 December 2009 (UTC)
2% (initial ideas on the table)
- KDE Gitorious should be branded accordingly, and should be reachable from git.kde.org as well as kde.gitorious.org
Unscheduled & Open
Allow tagging without involving sysadmins
- Pushing a tag currently requires permissions to do a force push, which is a repository-wide checkbox that can only be toggled by a kde-developers admin. Thus the workflow for a dev wanting to do a release tag for his app is to ask an admin to enable force pushing, then to push his tag, and then to tell the admin he can disable force pushing again. This doesn't scale, is insecure, and at odds with KDE's open access policy when it comes to managing the repos (right now in SVN, you need sysadmin to create an app dir in /tags for you, but don't have to ask permission for every individual tag). Johan has promised a solution for this.
- Notable discussion points on kde-scm-interest:
Account setup on Gitorious
Owner: eean, johan, boud, dario
- Creating an account on Gitorious isn't hard, but asking to be added to the KDE group is inconvenient. For the migration we should set up a system (via email or wiki?) where developers can ask to have an account autocreated for them, or add their existing Gitorious account to a list to be added to the group. Once this is in place an announcement should be sent to all svn accounts explaining the process, and privacy information.
- Basically the currently method of using Bugzilla works fine now and works fine in the longterm. But in the transition month when hundreds of accounts must be created or added, we need a better system. Its important to make it as easy as possible so that we don't lose anyone in the shuffle.
- I think most people have made their own accounts by now. this isn't really needed.
Owner: morice Ian Monroe
We have a fairly complete set of post-update hooks now. See remotehook. However, it would be nice to have a system that lives on the Gitorious server and/or requires less manual maintenance. But its certainly workable and no longer a blocker.
Get rid of svn:externals
100% completed (estimate)
Owner: David Faure
- not possible with git, broken by design.
Exists, but ignorable:
- kdesupport shared-desktop-ontologies (temporary)
- playground/utils strigi-chemical/test/ctfr
- playground/devtools kdevelop4-extra-plugins/php/parser/generated/kdevelop-pg-qt
- playground/devtools kdevelop4-extra-plugins/python/parser/generated/kdevelop-pg-qt
- playground/devtools kdevelop4-extra-plugins/qmake/parser/generated/kdevelop-pg-qt
- playground/devtools kommander-plugins/database3/admin
- playground/devtools kommander-plugins/database/admin
- playground/devtools kommander-plugins/datetimefuncs/admin
- playground/devtools kommander-plugins/htmlpart/admin
- playground/devtools kommander-plugins/httpform/admin
- playground/devtools kommander-plugins/kparts/admin
- playground/devtools kommander-plugins/qtactionproxy/admin
- playground/devtools kommander-plugins/timewidget/admin
- playground/devtools kommander-plugins/webkit3/admin
- playground/devtools kpackagemaker/admin
Status: Amarok has EBN checks
- EBN's krazy checks currently run on kde's svn repo; it needs upgrading to download and check our git repos too.
- This would be easier if there was a repo-list that EBN could parse, as it can no longer just svn up to get everything.
Talk to people using other distros about git
100% completed (estimate)
Owner: Sebas, Eike
- Gentoo: They seem to be prepared for moving their live SVN packages to git; their package manager has easily-reusable classes to fetch from an SCM and moving the ebuilds to using the git class rather than the SVN class should be easy. Positive comments to that end from people in #gentoo-kde.
- Fedora: Some unhappyness about git because SVN allows them to remotely produce a diff between two SVN URLs (or two revisions of one and the same URL) without making a checkout first, while git requires making a clone. Kevin Kofler (IRC nick Kevin_Kofler, #fedora-kde) says this will make their packager work harder.
- Debian: Is indifferent about the SCM switch.
Post Update hooks
100% completed (estimate)
Owner: morice, johan, mattr
- List of scripts needed:
- Gitorious needs to provide a way for hooks to be called; KDE needs to write said hooks.
- There is a branch of gitorious called web-hooks http://gitorious.org/gitorious/mainline/commits/web-hooks --Panagiotis Papadopoulos 1 November 2009
- Same situation as commit emails. I can do it but it doesn't scale well and a Gitorious-supported solution would be nicer. --eean 16:07, 12 November 2009 (UTC)
Opt-in privacy exception required for kde-developers
Owner: Gitorious, KDE e.V. Board, eean
- Such requirements will likely be put into the contract with Shortcut.
- So the e.V. Board is an owner since this is a legal/contract/money issue. Added myself only because I'm shepherding the issue. --eean 16:16, 12 November 2009 (UTC)
- We will not get sql access to the information. For the alternative solution see the Push Log issue
100% completed (estimate)
This should be easily done with Gitorious web interface and merge requests actually.
- but reviewboard has features gitorious (right now) doesn't, like commenting on specific lines and not having to set up a merge request. --chani
- Also email notifications when someone reviews are needed --thomasz
- We're working on this for someone else right now, so pretty soon --johan-s
- I consider the latest changes to gitorious to finish this. If more reviewboard features are still needed, and git supports reviewboard, I think this is something we can look at doing post-conversion. --Ian Monroe
Gitorious Needs a feature to disable merge request emails for certain repos
100% completed (estimate)
Have a sensible system for merge request emails. This is now in place - you can join groups, chose whether to have emails on a per repo basis, etc.
SSH blocked in corporations and universities.
100% completed (estimate)
- Some universities tend to block the SSH port. There should be a workaround to use SSH on some different port. github.com already runs a SSH server on port 443. But that assumes you are using a proxy. It has been found that this hasn't worked with a lot of people, especially those who have a direct connection to the internet ( so some transparent blocking by the ISP ). It would be great if (almost) every KDE developer were to be asked to check if other ports work before KDE made the switch. Otherwise there could be an automated email where the git patches could be sent, and appropriately patched to the right location too.
- http://blog.gitorious.org/2009/10/20/stuck-behind-a-firewall/, and there's always been HTTP cloning (although the current impl. in Git is a bit on the slow side) --johan-s
Talk to windows guys about git.
100% completed (estimate)
They aren't huge fans of git, but are using it. They require a single mainline and can't cope with multiple branches. Otherwise, it's workable, even if it will take an adjustment period.
100% completed (estimate)
- acltest, docbook, EOL/UTF-8
- A web hook isn't good enough for these because they have to run and return whether to allow the push, for every single push to every KDE repo.
- gitorious guys said they *might* be willing to allow a few scripts on their server for KDE as a special exception, iirc. --chani
- Yes, at least for basic things, heavier things like doc building would probably have to be mirrored (goes for pre/post) --johan-s
- It turns out that acl and docbook might not be needed so long as web and docs/ stuff stays in svn.
- Here's where to find the current scripts - http://websvn.kde.org/trunk/kde-common/svn/hooks/ --Argonel 23:06, 11 November 2009 (UTC)
- So: this is actually done because it needs no longer to be done? (boud)
- Apparently, so; moving to complete. (aseigo)
Someone said: KDE accounts file is no longer necessary---used for mapping svn ID -> email, but we have that now from Gitorious.
Answer from David Faure: I strongly disagree. We still need a KDE accounts file. This is very useful for finding people's email addresses, and having an overview on the number of active kde contributors; and if we keep it we can even have a kdepim resource again for filling an addressbook from it, for completion in kmail's composer (so you can write to any other kde contributor by just typing his/her name). It's also used for populating automatically the kde-cvs-announce mailing-list, for announcements. kde-common/accounts is our family tree (well, list), let's not get rid of it.
Here's my proposal for a kde-common/accounts replacement for the git era: We write a post-receive hook that looks at every commit and records all known email addresses for a given real name as well as the commit hash and date of when an address was last encountered. We can then present that data in the form of a file like kde-common/accounts, or write a web interface to query it (with nice links to the commits on Gitorious, etc.) --Eike (Sho_ on IRC)
To clear up possible confusion: The author information for a given commit is baked into the commit object itself, and comes from the configuration of the git repository it was created in. It is unrelated to any Gitorious account. Due to the distributed nature of Git, the one who uses his Gitorious account to push a commit need not be the same who created it. If Developer A creates a commit in his local clone and Developer B fetches it into his local clone directly from Developer A's machine and then pushes it into the public repo, the repo will only show a commit from Developer A. The Gitorious website will show that Developer B has pushed up a commit from Developer A, but that data is not contained in the repository. Thus collecting only Gitorious accounts and their mail addresses is insufficient. --Eike
http://mail.kde.org/pipermail/dot-stories/2005-May/000509.html might be a good guide on what docs we need.
some of this stuff was from the list from GCDS that was in this email http://markmail.org/message/u6eqfjece7fibfyo
TODO merge this with the todolists above
michael jansen: talking to kdesvn-build/mpyne
- --Done? -> http://kdesvn-build.kde.org/releases/kdesvn-build-1.10.php -- Panagiotis Papadopoulos 1 November 2009
- Yes, but the __kdesvn-build-remote used in the impl isn't pleasant for users already on git so it still needs more work for them. Mpyne 20:32, 11 November 2009 (UTC)
jonas: domain name
ML: convert to SSH
chani: techbase docs for scripty
sebas/lydia/leo: communication with teams! tell people! keeping track that
everything is being done.