Exercises:

1

• Exercises
• Configuration Management with ClearCase

2
What is ClearCase?
3
ClearCase is

• Version management tool for all types of files
  and directories- records all actions- reports
  history- accurate reproduction of every release
• Available both in Unix and Windows NT
  environments
• Two user interfaces- command line cleartool-
  graphical xclearcase

4
Basic Concepts

• VOB- Versioned Object Base - the whole database
  consists of several VOBs
• CONFIG SPEC- configuration specification (file)
  that defines what version of each VOB element
  you see in your view
• VIEW- a working area from where you have access
  to the VOB- each individual developer or closely
  coordinated group has an own view

5
Basic Concepts (cont.)

• ELEMENT- file or directory that is stored in a
  VOB
• META-DATAtypes- labels- attributes-
  hyperlinks- triggers- can be connected to a
  specific version of an element, or to a branch,
  or to the entire element

6
Basic Concepts (cont.)
VOBs
vob3
vob2
vob1
CONFIG SPECs
element CHECKEDOUT element ../phase2/LATEST el
ement REL1 -mkbranch phase2 element
/main/LATEST
VIEWs
Kalles view
Annas view
Test groups view
Peters view
elements
7
Default Config Spec

• element CHECKEDOUT
• element /main/LATEST
• - a rule per line
• - rules are processed from top to bottom if no
  matching version of an element was not found for
  the first rule, the system tries to find a
  version that matches the second rule etc.

8
Files in a Normal View Window
z.cc
w.cc
x.cc
y.cc
CHECKEDOUT
9
Files in Version Tree Browser Window
x.cc
z.cc
y.cc
w.cc
0
0
0
0
1
1
1
1
2
2
2
2
3
3
3
3
4
4
CHECKEDOUT
4
5
10
Versions that match with Default Config Spec
0
0
0
0
1
1
1
1
2
2
2
2
3
3
3
3
4
4
5
x.cc
z.cc
y.cc
w.cc
11
Labelling
x.cc
z.cc
y.cc
w.cc
0
0
0
0
1
1
1
1
REL1
2
2
2
2
REL1
REL1
3
3
3
3
4
4
4
REL1
5
12
Example of Config Spec for Label REL1

• element REL1
• element /main/LATEST

13
Versions that match using the Config Spec for
REL1
0
0
0
0
1
1
1
1
2
REL1
2
2
2
REL1
REL1
3
3
3
3
4
4
4
REL1
5
x.cc
z.cc
y.cc
w.cc
14
Branching
x.cc
z.cc
y.cc
w.cc
0
0
0
0
1
1
1
1
REL1
2
2
2
2
rel1_corr
REL1
REL1
3
3
3
3
0
rel1_corr
4
4
4
0
1
REL1
5
1
15
Example of Branch Config Spec

• element CHECKEDOUT
• element /main/rel1_corr/LATEST
• element REL1 -mkbranch rel1_corr
• element /main/LATEST

16
Versions that match using the Branch Config Spec
x.cc
z.cc
y.cc
w.cc
0
0
0
0
1
1
1
1
REL1
2
2
2
2
rel1_corr
REL1
REL1
3
3
3
3
0
rel1_corr
4
4
4
0
1
REL1
5
1
z.cc
x.cc
y.cc
w.cc
17
Basic Actions for an Element

• Checkout- a new editable version is created-
  only one person can edit the file at the same
  time
• Checkin- the version that was created by
  checkout command is saved to the VOB and is
  then visible to the other views - the element
  changes to write-protected mode
• Uncheckout - undo operation for checkout

18
Other Utilities

• Clearmake- ClearCase variant of the Unix make
  utility
• MultiSite- same VOB is used concurrently at
  several different locations

19
Thats ClearCase!

Lets try how it works in practise