events_ccase

An event record stores information for various operations:

The following kinds of VOB database objects have event histories, which you can display with lshistory:

• VOB
• VOB storage pool
• Element
• Branch
• Version
• VOB symbolic link
• Hyperlink
• Derived Object (no creation event)
• Replica
• Policy
• Rolemap
• Type
  • Attribute type
  • Branch type
  • Element type
  • Hyperlink type
  • Label type
  • Trigger type
• UCM objects
  • Project
  • Stream
  • Folder
  • Activity
  • Component

Each time an object from any of these categories is created, it begins its own event history with a creation event. (Derived objects are an exception; ClearCase stores a DO's creation time in its config record, not in an event record.) As time passes, some objects, VOBs and elements, in particular, can accumulate lengthy event histories.

Do not confuse type objects (created with mkattype, mkbrtype, mkeltype, mkhltype, mklbtype, and mktrtype) with the instances of those types (created with mkattr, mkbranch, mkelem, mkhlink, mklabel, and mktrigger). The type objects are VOB-database objects, with their own event histories. Individual branches, elements, and hyperlinks are also VOB-database objects. However, individual attributes, labels, and triggers are not VOB-database objects and, therefore, do not have their own event histories. Their create and delete events (mkattr/rmattr, mklabel/rmlabel, and mktrigger/rmtrigger) are recorded on the objects to which these metadata items are attached.

The following kinds of operations cause event records to be written to the VOB database:

• Create or import a new object.
• Destroy (remove) an object.
• Check out a branch.
• Modify or delete version data.
• Modify a directory version's list of names.
• Attach or remove an attribute, label, hyperlink, or trigger.
• Lock or unlock an object.
• Change the name or definition of a type or storage pool.
• Change a branch or element's type.
• Change an element's storage pool.
• Change the protections for an element or derived object.

If UCM is in use, the following kinds of operations cause event records to be written to the UCM Project VOB (PVOB) database.

• Start, cancel, or complete a deliver or rebase operation.
• Create, change, or remove a project, stream, baseline, or activity.

Table 1 lists event-causing base ClearCase operations as you may see them in lshistory output that has been formatted with the –fmt option's %o (operation) specifier. Note that most operations correspond exactly to cleartool subcommands.

Key to Table 1 and Table 2.

Each of the following superoperations represents a group of the event-causing operations listed in Table 1 and Table 2. For information about how to use the following keywords to write triggers for groups of operations, see mktrtype.

Table 1 omits the triggerable operations uncheckout and chevent; as these operations do not cause event records to be stored in the VOB database.

This section describes where, directly or indirectly, you may encounter event record contents. The following commands include event history information in their output, which can be formatted with the –fmt option:

The set of ClearCase commands in Table 1 matches almost exactly the set of commands that accept user comments as input. (reformatvob, which takes no comment, is the only exception.) When you supply comments to a ClearCase command, your comment becomes part of an event record.

Some cleartool commands create a comment even if you do not provide one. These generated comments describe the operation in general terms, such as "modify metadata" or "create directory element." User comments, if any, are appended to generated comments. For a complete description of comment-related command options and comment processing, see the comments reference page.