subversion overview

Subversion

An Overview

© Polarion Software GmbH 2006 SVN Workshop 2

Subversion – Leading the SCM MarketAccording to Forrester Q2/2007

• June 2000 - Coding begins.

• August 2001 - Subversion becomes self-hosting.

• 2002 – 1st release

• 2004 – Feb. Release 1.0.0

• 2006 – Sept. Release 1.4.0

• Latest Release: 1.4.6


What can Subversion Do For You

Backing up data

Documentation

Configuration

Management

Distributed

Development

CR 12


Subversion – Architecture Overview

Berkley DB

FSFS

SubversionRepository

Client

Interface

Repository

Interface

GUI client apps

Commandline

client apps

ClientLibrary

Working Copy Management

Library

Repository

access

DAV

SVN

Local

Apache

mod_dav

mod_dav_svn

svnserve

Internet(Any TCP/IP Network)

Single Sign On LDAP

High Secure SSL

Office Integration WebDAV

UNIX, LINUXWINDOWS

Offline Support


Subversion – Easy Windows Integration

• Tortoise Smoothly integrated in windows explorer


The Working Cycle

svn checkoutsvn update

get content

svn addsvn movesvn delete

Make changes

svn status -u

See what was changed in the repository in the meantime

svn update

Update your local copy

svn diffsvn resolved

Merge your changesResolve conflicts

svn commit

Submit your changes

10

5

10

0

10

6

Subversion

Repository


Subversion – ArchitectureThe revision numbers

0 1 2 3

Each revision isa complete configuration

Not just file management but

management of changes


Subversion - Concepts

• Atomic Commits No part of a commit takes effect

until the entire commit has succeeded.

Revision numbers are per-commit, not per-file; log messages are attached to the revision, not stored redundantly as in CVS.

No inconsistence in repository because large commits happened at the same time

Files within a commit are grouped automatically so it is effident what files have been part of a change set without extra labels


Subversion – Branches, Tags

• Branching and tagging are cheap (constant time) operations Branches and tags are both implemented in terms of an underlying

"copy" operation. A copy takes up a small, constant amount of space.

BRANCH 1

Extremely fastbranching and

Tagging

„before using Subversion we waited in some projects 15 min. until a branch was created.“


branches

trunk

Calc

Root

Paint

my-calc branch

branches

trunk

Easy to Understand

Branching is Cheap

Can be deletedand reanimated

BranchesCreating Branches


Subversion – Staging

• Staging can be managed via folder structures

tags

Project 1

Root

trunk

Dev

QA

Rel

Development stage

Releases for QA

Final Releases


Suberversion – Binary Files

• Efficient handling of binary files Subversion is equally efficient on

binary as on text files, because it uses a binary diffing algorithm to transmit and store successive revisions.

After Migration to Subversion a repository is usually between 30% smaller

Update and commit operations on binaries are much faster with subversion.


Subversion –Scalability

0

10

20

30

40

50

60

70

80

90

100

3.2

9.6 16

22.4

28.8

35.2

41.6 48

54.4

60.8

67.2

73.6 80

86.4

92.8

99.2

105.

611

211

8.4

124.

813

1.2

137.

614

415

0.4

156.

8

Repo Size (GB)

Tim

e (

s) Log (50 revs)

Checkout800MB

Checkout_rev1_800MB


Subversion – Migration

• Migrations are possible from CVS Clear Case PVCS Visual Source Safe MKS StarTeam

subversion overview

Business

subversion branches

local copy svn diff

revision numbers svn

windows explorer svn

extra labels svn workshop

meantime svn update

svn svnserve internet

changes resolve conflicts