Feature Based Development for Web Apps with Bazaar A Sydney PHP Group presentation 1 st May 2008 James Ellis customr.net

with Bazaar

A Sydney PHP Group presentation

1 st May 2008

James Ellis

customr.net

WHY ?

?

A feature is... A common set of changes that combine to produce the required result

A common set of changes that combine to produce the required result

Version Control Evolution File clobber (no control) – e.g transferring files with FTP Enter the Tree (Concurrent Version Systems) Improving CVS with Subversion (SVN) Distributed – (centralise if you wish)

File clobber (no control) – e.g transferring files with FTP

Enter the Tree (Concurrent Version Systems)

Improving CVS with Subversion (SVN)

Distributed – (centralise if you wish)

File Clobber with FTP Destructive Revision Control Does not scale beyond one developer (Supported in Bazaar via a plugin) Manual Merges – who is doing the washing up?

Destructive Revision Control

Does not scale beyond one developer

(Supported in Bazaar via a plugin)

Manual Merges – who is doing the washing up?

Tree Versioning - centralised (-) Supports only one model of work (-) Branches and merges should be easier (+/-) Connection to remote server required (+) Much better QA (-) The freeze (please don't commit!) “ Subversion has been the most pointless project ever started... Subversion used to say, 'CVS done right.' With that slogan there is nowhere you can go. There is no way to do CVS right.” Linus Torvalds via /.

(-) Supports only one model of work

(-) Branches and merges should be easier

(+/-) Connection to remote server required

(+) Much better QA

(-) The freeze (please don't commit!)

“ Subversion has been the most pointless project ever started... Subversion used to say, 'CVS done right.' With that slogan there is nowhere you can go. There is no way to do CVS right.” Linus Torvalds via /.

Tree Versioning – distributed Common tasks are implicit rather than explicit No file clobber – allows multiple branch dev. Similar tools – Bazaar, Git Implicit supports for standard protocols (http, ftp, sftp etc etc) that we already use every day. Does everything centralised does (and better) Allows scaling Up and Out

Common tasks are implicit rather than explicit

No file clobber – allows multiple branch dev.

Similar tools – Bazaar, Git

Implicit supports for standard protocols (http, ftp, sftp etc etc) that we already use every day.

Does everything centralised does (and better)

Allows scaling Up and Out

Everything is a branch Developers work in their own local branches Checkouts do exist – these are “bound” branches Developers provide patches to release managers Patches are merged into other branches QA step prior to publishing web app updates

Developers work in their own local branches

Checkouts do exist – these are “bound” branches

Developers provide patches to release managers

Patches are merged into other branches

QA step prior to publishing web app updates

Choose a development model No model is bad in Bazaar Easy to change between models without changing tools Centralised – SVN style single developer Centralised – SVN style multi developer Distributed – Allow committing to a “main” branch. Distributed using Gatekeeper – providing features for inclusion

No model is bad in Bazaar

Easy to change between models without changing tools

Centralised – SVN style single developer

Centralised – SVN style multi developer

Distributed – Allow committing to a “main” branch.

Distributed using Gatekeeper – providing features for inclusion

Providing features Mantra : Treat your web app like an application, not a bunch of files Promotes experimentation without conflict Introduces the “Gatekeeper” role(s) Allows intra developer sharing (http/sftp/mdns) You can go on holiday AND have version control!!!

Mantra : Treat your web app like an application, not a bunch of files

Promotes experimentation without conflict

Introduces the “Gatekeeper” role(s)

Allows intra developer sharing (http/sftp/mdns)

You can go on holiday AND have version control!!!

Simple Bazaar Implementation Install Linux, Unix, Windows, Mac packages Branch in five seconds Dev : Take a branch, work, commit and provide a patch QA : Preview, merge and update Release : provide release archive (zip, tar etc) which can be packaged (rpm, deb, etc)

Install Linux, Unix, Windows, Mac packages

Branch in five seconds

Dev : Take a branch, work, commit and provide a patch

QA : Preview, merge and update

Release : provide release archive (zip, tar etc) which can be packaged (rpm, deb, etc)

Examples Create a branch Create a repo Pull a branch and keep it up to date Work on a feature then Commit Patch/Push Merge and optionally resolve conflicts Checkout and Update (or Export)

Create a branch

Create a repo

Pull a branch and keep it up to date

Work on a feature then Commit

Patch/Push

Merge and optionally resolve conflicts

Checkout and Update (or Export)

Integration with web dev tools Editor plugins (eclipse) Or just use the command line Bzr GUI's (GTK, Qt, Tortoise) Apache – virtual hosts are your friend Avahi (aka Rendezvous) sharing on a local net Bzr Plugins (upload)

Editor plugins (eclipse)

Or just use the command line

Bzr GUI's (GTK, Qt, Tortoise)

Apache – virtual hosts are your friend

Avahi (aka Rendezvous) sharing on a local net

Bzr Plugins (upload)

Further reading & support bazaar-vcs.org Bazaar documentation Bazaar in Five Minutes (excellent) Bazaar Mailing Listings Commercial Support provided by Canonical Experiment Remember the Five Steps

bazaar-vcs.org

Bazaar documentation

Bazaar in Five Minutes (excellent)

Bazaar Mailing Listings

Commercial Support provided by Canonical

Experiment

Remember the Five Steps