config spec

config_spec

Rules for selecting versions of elements to appear in a view

APPLICABILITY

Product	Command type
ClearCase	data structure
ClearCase LT	data structure

Platform
UNIX
Windows

SYNOPSIS

• Standard rule:

scope pattern version-selector [ optional-clause ]

• Create-branch rule:

mkbranch branch-type-name [ –override ] , ..., [ end mkbranch [ branch-type-name ] ]

• Time rule:

time date-time, ... , [ end time [ date-time ] ]

• File-inclusion rule:

include config-spec-pname

• Load rule (for snapshot views):

load pname ...

DESCRIPTION

A view's config spec (configuration specification) contains an ordered set of rules for selecting versions of elements. The view's associated view_server process populates a view with versions by evaluating the config spec rules. For more information about view_server, see the Administrator's Guide.

In a dynamic view, version selection is dynamic. Each time a reference is made to a file or directory element — either by ClearCase software or by standard programs — the view_server uses the config spec to select a particular version of the element. (In practice, a variety of caching techniques and optimizations reduce the computational requirements.)

In a snapshot view, users invoke an update operation to select versions from the VOB.

UCM config specs are different from those for base ClearCase and base ClearCase LT in that their rules are generated, not user-specified; read UCM Config Specs before reading any other section of this reference page.

Config Spec Storage / Default Config Spec

Each view is created with a copy of the default config spec, default_config_spec:

element * CHECKEDOUT	For any element, select the checked out version, if any)
element * /main/LATEST	Otherwise, select most recent version on the main branch

Modifying this file changes the config spec that newly created views receive, but does not affect any existing view.

An individual view's config spec is stored in its view storage directory, in two forms:

• Source format. The user-visible version, config_spec, contains only the series of config spec rules.
• Compiled format. A modified version, .compiled_spec, includes accounting information. This version is created and used by the view_server process.

Do not modify either of these files directly; instead, use the commands listed below. Different views' config specs are independent: they may contain the same set of rules, but changing one view's config spec never affects any other view.

Commands for Maintaining Config Specs

Commands for manipulating config specs:

catcs	Lists a view's config spec
setcs	Makes a specified file a view's config spec
edcs	Revises the current config spec of a view
update –add_loadrules	Adds load rules to the config spec of a snapshot view while updating the view

HOW A CONFIG SPEC SELECTS VERSIONS

The set of elements considered for version selection is different for the two kinds of views:

• In a dynamic view, all elements in VOBs mounted on the current host are considered for version selection.
• In a snapshot view:
• If you are updating a loaded element, the behavior is the same as in a dynamic view and the selected version is loaded into the view.
• If you are not updating and the element is loaded, the selection from the last update is used.
• If the element isn't loaded, the behavior is the same as in a dynamic view.

For each element, the following procedure determines which version, if any, is in the view.

1. The view's associated view_server process tries to find a version of the element that matches the first rule in the config spec:

• If such a version exists, that version is in the view.
• If multiple versions match the rule, an error occurs, and no version of the element is in the view. ClearCase and ClearCase LT commands that access the element print errors like this one:

cleartool: Error: Trouble looking up element "ht.c" in directory ".".

Standard commands that access the element print errors like this one:

The request could not be performed because of an I/O device error.

• If no version matches the first rule, the search continues.

If no matching version was found for the first rule, the view_server tries to find a version that matches the second rule.

The view_server continues in this way until it finds a match or until it reaches the last rule.

Order Is Important

Because the rules in a config spec are processed in order, varying the order may affect version selection. For example, suppose this rule appears near the beginning of a config spec:

element * /main/LATEST

Any subsequent rules in the config spec will never be used, because the rule always provides a match; every element has a most-recent version on its main branch.

Note: The order in which the load rules for a snapshot view are specified is not important.

CHECKEDOUT Rule for Snapshot Views

The config spec for a snapshot view must contain element * CHECKEDOUT as the first element rule.

Failure to Select Any Version

If no version of an element matches any rule in the config spec:

• In a dynamic view:
• The element's data is not accessible through the view. The operating system listing command and other standard programs print a not found error when attempting to access the element.
• The cleartool ls command lists the element with a [no version selected] annotation. You can specify the element in commands that access the VOB database only, such as describe,lsvtree, and mklabel.
• In a snapshot view, the element will not be loaded.

View-Private Files

A view's config spec has no effect on the private objects in a view, such as view-private files, links, directories; or, in the case of a dynamic view, derived objects. View-private objects are always accessible.

Exception: (Dynamic views only) If a config spec lacks a CHECKEDOUT rule, the view-private file that is a file element's checked-out version is not visible. See “Special Version Selectors” below.

OVERALL SYNTAX GUIDELINES

Each config spec rule must be contained within a single physical text line; you cannot use a backslash (UNIX), a caret (Windows), or any other line continuation character to continue a rule onto the next line. Multiple rules can be placed on a single line, separated by semicolon (;) characters.

Lines that begin with a number sign (#) are comments.

Extra white space (<SPACE>, <TAB>, vertical-tab, and form-feed) characters are ignored, except within the version selector. If a version selector includes white space, enclose it in single quotes.

If a load rule specifies a file or directory name that includes one or more <SPACE> characters, you must enclose the entire pathname in either single-quotes (‘) or double quotes (“).

In general, VOBs, views, and the ClearCase and ClearCase LT tools that access them are case-sensitive. Therefore, config spec rules must use case-correct pathnames.

You can use slashes ( / ) or backslashes ( \ ) as pathname separators in pathname patterns and version selectors unless you are sharing the config spec between UNIX and Windows hosts. In that case, you must use slashes. (See Sharing Config Specs Between UNIX and Windows Hosts.)

SHARING CONFIG SPECS BETWEEN UNIX AND WINDOWS HOSTS

Windows and UNIX clients can share config specs, which are portable between the two operating systems. That is, clients on both systems, using views whose storage directories reside on either kind of host, can set and edit the same set of config specs. However, Windows and UNIX network regions often use different VOB tags to register the same VOBs. Only single-component VOB tag names, like \src2vob, are permitted on Windows clients; multiple-component VOB tags, like /vobs/src/proj1, are common on UNIX. When the VOB tags diverge between regions, config spec element rules that use full pathnames (which include VOB tags) are resolvable (at config spec compile time) only by hosts in the applicable network region. This implies a general restriction regarding shared config specs: a given config spec must be compiled only by hosts on one operating system or the other—the operating system for which full pathnames in element rules make sense. That is, a config spec with full pathnames can be shared across network regions, even when VOB tags disagree, but it must be compiled in the right place.

This restriction does not apply if any of the following are true:

• The config spec's element rules use relative pathnames only, which do not include VOB tags.
• Shared VOBs are registered with identical, single-component VOB tags in both Windows and UNIX network regions. (The VOB tags \r3vob and /r3vob are logically identical, differing only in their leading slash characters.)
• The config spec does not include any load rules or element rules.

Config Spec Compilation

An in-use config spec exists in both text file and compiled formats (both of which are visible in the view's storage directory). A config spec in its compiled form is portable. The restriction is that full VOB pathnames in element rules must be resolvable at compile time. A config spec is compiled if a client executes either of these cleartool commands: edcs or setcs –current. Therefore, if a client on the “wrong” operating system recompiles a config spec with one of these commands, the config spec becomes unusable by any client using that view. If this happens, recompile the config spec on the “right” operating system.

A sample element rule that could be problematic:

element /vob_p2/src/*    /main/rel2/LATEST

If the VOB is registered with VOB tag \vob_p2 on a Windows network region, but with VOB tag /vobs/vob_p2 on a UNIX network region, only Windows clients can compile the config spec.

Pathname Separators

When writing config specs to be shared by Windows and UNIX clients, use the slash (/), not the backslash (\), as the pathname separator in pathname patterns and version selectors. ClearCase and ClearCase LT on Windows can parse either separator in pathnames; ClearCase and ClearCase LT on UNIX recognizes the slash only.

STANDARD RULES

A standard version-selection rule takes this form:

scope pattern version-selector [ optional-clause ]

The following subsections describe these components.

Scope

The scope specifies that the rule applies to all elements, or restricts the rule to a particular type of element.

element

The rule applies to all elements.

element –file

The rule applies to file elements only. This includes any element created with a mkelem command that omits –eltype directory (or a user-defined element type derived from the directory).

element –directory

The rule applies to directory elements only. This includes any element created with mkdir or mkelem –eltype directory (or a user-defined element type derived from the directory).

element –eltype element-type

The rule applies only to elements of the specified element type (predefined or user-defined). This mechanism is not hierarchical: if element type aaa is a supertype of element type bbb, the scope element –eltype aaa does not include elements whose type is bbb. To specify multiple element types, you must use multiple rules:

element –eltype aaa * RLS_1.2
element –eltype bbb * RLS_1.2

Selecting Versions of
VOB Symbolic Links. There is no VOB
symbolic link scope. A VOB symbolic link is cataloged (listed) in one or more
versions of a directory element. The link appears in a view if both of these
conditions are true:

• One of those directory versions is selected by the
  view's config spec.
• The config spec includes any
  element rule, even a –none rule.

Pattern

A pathname pattern,
which can include any ClearCase or ClearCase LT wildcard (see the wildcards_ccase reference
page for a complete list). For example:

*

Matches
all element pathnames; does not match recursively.

*.c

Matches
all element pathnames with a .c extension.

src/util.c

Matches
any element named util.c that resides in any directory
named src.

/vobs/project/include/util.h

Matches
one particular element.

src/.../util.c

Matches
any element named util.c that resides anywhere within the
subtree of a directory named src (including in src itself).

src/.../*.[ch]

Matches
all elements with .c and .h extensions
located in or below any directory named src.

src/...

Matches the entire directory tree (file elements
and directory elements) starting at any directory named src.

Note: In non-config-spec contexts, the ... pattern
matches directory names only.

Restrictions:

• A view-extended pathname pattern is not valid.
• A relative pathname pattern
  must start below the VOB tag (VOB mount point, VOB root directory). For
  example, if the VOB tag is /vobs/project, project/include/utility.h is
  not a valid pattern.
• A full pathname pattern must
  specify a location at or beneath a valid VOB tag. For example, if the VOB
  tag is /vobs/project, then /vobs/project/... and /vobs/project/include/... are
  both valid.

The setcs or edcs command
fails if it encounters an invalid location in any config spec rule:

cleartool: Error: No registered VOB tag in path: "..."

• VOB symbolic links are not
  valid in pathname patterns.
• On Windows systems, patterns
  can be specified using either backslashes (\) or slashes (/).

Version Selector

You can use a version
label, version ID, or any other standard version selector. See the version_selector reference
page for a complete list. Some examples follow:

/main/4

Version
4 on an element's main branch.

REL2

The
version to which version label REL2 has been attached. An
error occurs if more than one version of an element has this label.

.../mybranch/LATEST

The
most recent version on a branch named mybranch; this branch can
occur anywhere in the element's version tree.

/main/REL2

The
version on the main branch to which version label REL2 has
been attached.

{created_since(yesterday)}

The
version that has been created since yesterday. An error occurs if more than one
version satisfies this query. Because all queries are evaluated at run time,
the value yesterday is always interpreted relative to the day
that the query is executed.

{QA_Level>3}

The
version to which attribute QA_Level has been attached with a
value greater than 3. An error occurs if more than one version satisfies this
query.

.../mybranch/{QA_Level>3}

The
most recent version on a branch named mybranch satisfying the
attribute query.

Standard version
selectors cannot select checked-out versions in a config spec rule. (They can
in other contexts, such as the find command.) Instead, you
must use the special version selector, CHECKEDOUT, described below.

Special Version Selectors

The following special
version selectors are valid only in a config spec rule, not in any other
version-selection context:

CHECKEDOUT

Matches the checked-out version of an element,
if this view has a pending checkout. It doesn't matter where (on which branch
of the element) the checkout occurred; there is no possibility of ambiguity,
because only one version of an element can be checked out to a particular view.

This
special version selector actually matches the checked-out version object in the
VOB database, which is created by the checkout command.

For
file elements, standard commands access the view-private file created by checkout at
the same pathname as the element.

–config do-pname [ –select do-leaf-pattern ] [ –ci ]

This special version selector replicates the
configuration of versions used in a particular clearmake build.
It selects versions listed in one or more configuration records associated with
a particular derived object: the same set of versions that would be listed by
a catcr –flat command. See the catcr reference
page for explanations of the specifications that follow the –config keyword.

When
you set or edit a config spec, the view_server resolves
the do-pname with respect to the view's preexisting config
spec, not on the basis of any preceding rules in the config spec being
evaluated.

If
the configuration records list several versions of the same element, the most
recent version is selected to appear in the view. In such cases, a warning
message is displayed when the config spec is set.

–none

Generates an ENOENT (No such file or directory) error when a standard UNIX operating system program references
the element. For dynamic views:

• No error occurs when an
  operating system listing command lists the element's entire parent directory;
  the element is included in such a listing. This also applies to other readdir situations,
  such as expansion of wildcard characters and emacs file name
  completion.
• An error occurs when an
  operating system listing command names the element explicitly (perhaps after
  wildcard expansion) or whenever the name is processed with (UNIX) stat(2);
  in an ls –F command, when the entire directory is
  listed with ls –l, and so on.
• The cleartool ls command
  always lists the element, annotating it with no version selected.
• In ClearCase and
  ClearCase LT commands, the element's standard pathname refers to the
  element itself. (–none suppresses the transparency
  mechanism—translation of an element's standard pathname into a reference to a
  particular version.)

–error

Like –none,
except that the annotation generated by the cleartool ls command
is error on reference.

Optional Clause

Some config spec rules
can include an additional clause, which modifies the rule's meaning.

–time date-time

Modifies the meaning of the special version
label LATEST: the rule selects from a branch the last version that
was created before a particular time. The date-time argument
is specified in one of the standard formats:

date.time | date | time | now where:

date	:=	day-of-week | long-date
time	:=	h[h]:m[m][:s[s]] [UTC [ [ + | - ]h[h][:m[m] ] ] ]
day-of-week	:=	today |yesterday |Sunday | ... |Saturday |Sun | ... |Sat
long-date	:=	d[d]–month[–[yy]yy]
month	:=	January |... |December |Jan |... |Dec

Specify time in
24-hour format, relative to the local time zone. If you omit the time, the
default value is 00:00:00. If you omit date, the default is today.
If you omit the century, year, or a specific date, the most recent one is used.
SpecifyUTC if you want to resolve the time to the same moment in
time regardless of time zone. Use the plus (+) or minus (-) operator to specify
a positive or negative offset to the UTC time. If you specify UTC without
hour or minute offsets, Greenwich Mean Time (GMT) is used. (Dates before
January 1, 1970 Universal Coordinated Time (UTC) are invalid.)

The
creation times of the versions on the branch are looked up in their create version event
records. (No error occurs if you use a –time clause in a rule
that does not involve the version label LATEST; the clause has no
effect.)

The –time clause
in a particular rule overrides any general time rule currently in effect.
(See Time Rules )

Note: A –time clause must precede any
other optional clauses and may not include any query language constructs.

Examples:

/main/LATEST –time 10–Jul.19:00	Most recent version on main branch, as of 7 P.M. on July 10.
.../bugfix/LATEST –time yesterday	Most recent version on a branch named bugfix(which can be at any branching level), as of the beginning of yesterday (12 A.M.).
/main/bugfix/LATEST –time Wed.12:00	Most recent version on subbranch bugfix of the main branch, as of noon on the most recent Wednesday.
–time 5–Dec.13:00	December 5, at 1 P.M.
–time 11:23:00	Today, at 11:23 A.M.
–time 12–jun–99	June 12, 1999, at 00:00 A.M.
–time now	Today, at this moment.
–time 9-Aug.10:00UTC	August 9, at 10 A.M. GMT.

The date/time specification
is evaluated when you set or edit the config spec, and whenever the view_server process
is started (for example, with startview or setview (dynamic
views only)). Thus, the meaning of a relative specification, such as today,
may change over time. However, the date/time is not
evaluated at run time. Therefore if you last performed one of the commands
listed above four days ago, the meaning of a relative specification, such
as today, has the value of the date four days ago, not the value of
the date today.

–nocheckout

Disables
checkouts of elements selected by the rule.

–mkbranch branch-type-name

Implements
the auto-make-branch facility. When a version selected by this rule is checked
out:

• A branch of type branch-type-name is
  created at that version.
• Version 0 on the new
  branch is checked out, instead of the version that was originally selected.

(This
is a slight oversimplification. See the section “Multiple-Level Auto-Make-Branch”.) A mkelem command invokes the
auto-make-branch facility if the config spec includes a /main/LATEST rule
with a –mkbranch clause.

Restriction:
You cannot use –mkbranch in combination with –none or –error.

Multiple-Level
Auto-Make-Branch

A config spec can
include a cascade of auto-make-branch rules, causing checkout to
create multiple branching levels at once. checkout keeps
performing auto-make-branch until version 0 on the newly created branch is not
selected by a rule with a –mkbranch clause; then, it checks
out that version. For example:

1	element * CHECKEDOUT
2	element * .../br2/LATEST
3	element * .../br1/LATEST -mkbranch br2
4	element * MYLABEL -mkbranch br1
5	element * /main/LATEST

1	element * CHECKEDOUT
2	element * ...\br2\LATEST
3	element * ...\br1\LATEST -mkbranch br2
4	element * MYLABEL -mkbranch br1
5	element * \main\LATEST

If you check out an element in a view that currently selects the
version labeled MYLABEL:

1. A branch of type br1 is created at
   the MYLABEL version, following the fourth rule.
2. The third rule selects the
   newly created version .../br1/0, so a branch of type br2 is
   created at that version.
3. Version .../br1/br2/0 is
   checked out. The checked-out version has the same contents as the MYLABEL version,
   and is selected by the first rule. When you edit and check in a new
   version, .../br1/br2/1, the view will select it with the
   second rule.

CREATE BRANCH RULES

A create branch rule takes the following form:

mkbranch branch-type-name [ –override ]
  <config spec lines> 
[ end mkbranch [ branch-type-name ] ]

This rule is similar to the –mkbranch clause; use
it when you want to add a –mkbranch clause to many lines in a
complex config spec.

mkbranch branch-type-name [ –override ]

Attaches an implicit –mkbranch branch-type-name clause
to all element rules between mkbranch and end mkbranch (or
the end of the file) that do not have a –mkbranch clause or
include the CHECKEDOUT version selector.

Specifying –override will override any
explicit –mkbranch clauses or mkbranch rules
within the scope and replace them with –mkbranch branch-type-name.
Use –override if you do not want multilevel branch creation.

end mkbranch [ branch-type-name ]

Ends the mkbranch branch-type-name rule.
If end mkbranch is omitted, the rule is ended at the end of
the config spec. The branch-type-name argument is optional,
but if you include it, it must match the branch type specified with themkbranch rule.

mkbranch and end
mkbranch rules may be nested. For example:

element * .../branch2/LATEST
mkbranch branch2

element * .../branch1/LATEST
mkbranch branch1

element * /main/LATEST

end mkbranch branch1
end mkbranch branch2

Checking out foo.c creates foo.c@@/main/branch1/branch2/CHECKEDOUT.
This is a multiple-level mkbranch.

TIME RULES

A time rule takes this form:

time date-time
[ end time [ date-time ]  ]

It is analogous to the –time clause. A time rule
modifies the meaning of the special version label LATEST in
subsequent rules, with the following exceptions:

• An optional –time clause in a
  particular rule overrides any general time rule currently in effect.
• A subsequent time rule cancels
  and replaces an earlier one.

Use end time to
limit the effect of a time rule to a certain range. The date-time argument
is optional with end time, but if you include it, it must match
the date-time argument specified with the time rule.

The date-time specification
is evaluated when you set or edit the config spec, and whenever the view_server process
is started (for example, with startview or setview (dynamic
views only)). Thus, the meaning of a relative specification, such as today,
may change over time. However, the date-time is not
evaluated at run time. So if you last performed one of the commands listed
above four days ago, the meaning of a relative specification, such as today,
has the value of the date four days ago, not the value of the date today.

Time rules may be
nested. They may not include any query language constructs.

FILE-INCLUSION RULES

A file-inclusion rule
takes this form:

include config-spec-pname

The argument specifies a
text file that contains one or more config spec rules (possibly other include rules).
Include files are re-read on each execution of setcs and edcs.
A file-inclusion rule must be the last rule in a line. For example,

include config-spec-pname

and

time date-time;
include config-spec-pname

are both valid.

LOAD RULES

Load rules define which
elements are loaded (copied) into a snapshot view. (By contrast, element rules
define which version of an element is selected.) A load rule takes this form:

load pname ...

The argument specifies
one or more file or directory elements. Naming a directory element implies the
directory and all elements below the directory. Naming a file element specifies
that element only. Wildcarding is not supported; you must explicitly specify
all elements to be loaded.

More than one load rule
can appear in a config spec; you must have at least one to see any files in a
snapshot view. (Load rules in the config spec of a dynamic view are ignored.)

Load rules can be
positioned anywhere in a config spec, and their order is irrelevant.

An element can be
selected by more than one load rule without causing an error.

In the context of
loading a snapshot view, links can be characterized as VOB links, which point
to objects inside the VOB, and non-VOB links, which point outside the VOB.
Links are treated as follows:

• On UNIX systems, hard VOB links are followed; symbolic
  links are copy-created. If a VOB link cannot be resolved, an error
  results. Non-VOB links are resolved, if possible, but it is not an error
  if they cannot be resolved.
• On Windows systems, VOB links
  (both symbolic links and hard links) are followed. If a VOB link cannot be
  resolved, an error results. Non-VOB links are resolved, if possible. If
  they cannot be resolved, the load operation does not fail, but a warning
  is issued.

UCM CONFIG SPECS

UCM config specs are
unlike config specs for base ClearCase and base ClearCase LT in that they
are generated by mkstream and regenerated from time to time
by chstream and rebase. You may edit UCM config
specs only as follows:

• To add custom element-selection rules
• To add custom load rules for
  snapshot views

Only custom rules that
are correctly delimited are preserved when a UCM config spec is regenerated.

Note: Never use UCM-generated rules in config specs
for base ClearCase or base ClearCase LT.

Custom
Element-Selection Rules

Add custom
element-selection rules only between the custom element delimiters, as follows:

#UCMCustomElemBegin - DO NOT REMOVE - ADD CUSTOM ELEMENT RULES 
AFTER THIS LINE
rule
.
.
.
#UCMCustomElemEnd - DO NOT REMOVE - END CUSTOM ELEMENT RULES

The typical use for
custom element selection is to add an include rule that
enables the UCM view to see the contents of base ClearCase or base
ClearCase LT VOBs. See File-Inclusion
Rules.

Custom Load Rules

Add custom load rules
after the custom load delimiter, as follows:

#UCMCustomLoadBegin - DO NOT REMOVE - ADD CUSTOM LOAD RULES AFTER THIS LINE
rule
.
.
.

See Load Rules for more information.

EXAMPLES

Note: In the UNIX examples that follow, arguments and output that show
multicomponent VOB tags are not applicable to ClearCase LT, which
recognizes only single-component VOB tags. In this manual, a multicomponent VOB
tag is by convention a two-component VOB tag of the form /vobs/vob-tag-leaf—for
example, /vobs/src. A single-component VOB tag consists of a leaf
only—for example, /src. In all other respects, the examples are
valid for ClearCase LT.

• Include a standard set of rules to be used by every
  user on a particular project.

include /proj/cspecs/v1_bugfix_rules

• Modify the meaning of “most
  recent” to mean “as of 7 P.M. on July 10.”

time 10-Jul.19:00
       element \atria\lib\* ...\new\LATEST
       element * \main\LATEST
end time

• Select version 3 on the main branch
  of a particular header file.

element /usr/project/include/utility.h /main/3

• Select the most recent version
  on the main branch for all elements with a .c file
  name extension.

element *.c \main\LATEST

• Select the most recent version
  on the bugfix branch.

element * .../bugfix/LATEST

• Select versions of elements
  from a particular development branch, or with a related label.

element * CHECKEDOUT
element * ...\maint\LATEST	If no checked-out version, select latest version on the maint branch, which may or may not be a direct subbranch of main
element * BL2.6	Else, select version labeled BL2.6 from any branch
element * \main\LATEST

• Select versions of C language
  source files (.c file extension) based on the value of an
  attribute. A config spec such as this may be used by a developer to select
  versions of files for which he is responsible.

element * CHECKEDOUT
element –file *.c /main/{RESPONSIBLE=="jpb"}	For any .c file, select latest version on main branch for which jpb is responsible)
element –file /project/utils/.../*.c /main/BL2.6	Else, select version labeled BL2.6on main branch from /project/utilsdirectory, or any of its subdirectories
element * /main/LATEST

• Use the –mkbranch qualifier
  to create a new BL3 branch automatically. Create the
  branch off the version labeled BL2.6, or the latest version on
  the main branch if no version is labeled BL2.6.

element * CHECKEDOUT
element * ...\bl3_bugs\LATEST	If no version is checked out, select latest version on bl3_bugs branch)
element -file * BL2.6 –mkbranch bl3_bugs	Else, select version labeled BL2.6and create bl3_bugs branch on checkout
element -file * \main\LATEST –mkbranch bl3_bugs	Else, select latest version on mainbranch and create new branch on checkout

• Same as above, but use a mkbranch rule.

element * CHECKEDOUT
element * .../bl3_bugs/LATEST
mkbranch bl3_bugs
element -file * BL2.6
element -file * /main/LATEST
end mkbranch bl3_bugs

• Select the version
  labeled REL3 for all elements, preventing any checkouts
  to this view:

element * REL3 –nocheckout

• Select the most recent version
  on the bug_fix_v1.1.1 branch, making sure that this branch
  is a subbranch of bug_fix_v1.1, which is itself a subbranch
  of bug_fix_v1.

element * CHECKEDOUT
element * bug_fix_v1.1.1\LATEST
element * ...\bug_fix_v1.1\LATEST –mkbranch bug_fix_v1.1.1
element * ...\bug_fix_v1\LATEST –mkbranch bug_fix_v1.1
element * \main\LATEST –mkbranch bug_fix_v1

When
a user checks out an element for which none of these branches yet exists, a
cascade of auto-make-branch activity takes place:

Z:\myvob> cleartool checkout -nc . 
Created branch "bug_fix_v1" from "." version "\main\0".
Created branch "bug_fix_v1.1" from "." version 
"\main\bug_fix_v1\0".
Created branch "bug_fix_v1.1.1" from "." version 
"\main\bug_fix_v1\bug_fix_v1.1\0".
Checked out "." from version "\main\bug_fix_v1\bug_fix_v1.1\bug_fix_v1.1.1\0".

• Modify the previous config spec
  to create branch bug_fix_v2 off an existing branch rather
  than creating multiple subbranches.

element * CHECKEDOUT 
mkbranch bug_fix_v2 –override 
element * .../bug_fix_v1.1.1/LATEST 
element * .../bug_fix_v1.1/LATEST –mkbranch bug_fix_v1.1.1 
element * .../bug_fix_v1/LATEST –mkbranch bug_fix_v1.1 
element * /main/LATEST –mkbranch bug_fix_v1 
end mkbranch bug_fix_v2 

• For a snapshot view, select the
  most recent version on the main branch. Use load rules to
  select in the applets VOB all elements below the \cmdlg directory
  and one specific element in the \testdlg directory.

element * CHECKEDOUT
element *... \main\LATEST 
load \applets\cmdlg
load \applets\testdlg\opendlg.h