chmaster

Transfers mastership of an object

Applicability


Product	Command type
ClearCase®	cleartool subcommand
MultiSite	multitool subcommand


Platform
UNIX
Linux
Windows

Synopsis

chmaster [ –c/omment comment | –cfi/le comment-file-pname | –cq/uery

| –cqe/ach | –nc/omment ]

{ master-replica-selector object-selector ...

| [ –pname ] master-replica-selector branch-or-element-pname ...

| –str/eam [ –ove/rride ] master-replica-selector stream-selector ...

| –def/ault [ –pname ] branch-pname ... | –def/ault brtype-selector ...

| –all [ –obsolete_replica old-replica-selector ]

[ –l/ong ] [ –vie/w view-tag ] master-replica-selector

}

Description

This command transfers the mastership of one or more objects from one replica to another. Only the current replica is affected immediately; other replicas are notified of the mastership transfers through the normal exchange of update packets.

To limit use of this command to a certain set of users, you can create triggers. For more information, see DevOps Code ClearCase Guide to Managing Software Projects.

Specifying a view context

The chmaster command requires a view context. If you are not in a set view or working directory view on UNIX or Linux or in a view drive on Windows, you can specify a view on the command line, as shown in the following table. If you specify a dynamic view, it must be active on your host.

Note:

A view you specify in the chmaster command takes precedence over your current set view, working directory view, or view drive.


Argument	How to specify a view
`object-selector` `brtype-selector`	Use a view-extended pathname as the `vob-selector` portion of the argument. For example: lbtype:LABEL1@/view/jtg/vobs/dev brtype:v1.0_bugfix@/view/jtg/vobs/dev lbtype:LABEL1@s:\dev brtype:v1.0_bugfix@s:\dev
`branch-pname` `element-pname`	Specify `branch-pname` or `element-pname` as a view-extended pathname. For example: /view/jtg/vobs/dev/cmd.c@@ /view/jtg/vobs/dev/cmd.c@@/main s:\dev\cmd.c@@ s:\dev\cmd.c@@\main
`master-replica-selector` (for the chmaster –all variant)	Use the –view option or use a view-extended pathname as the `vob-selector` portion of the argument. For example: `–view jtg replica:boston_hub@\dev` replica:boston_hub@/view/jtg/vobs/dev replica:boston_hub@s:\dev

Restrictions

ACL authorization

If ACLs are enabled, the principal must have the following permissions:

read-info on VOB object
read-info on object
chmaster on object

Non-ACL authorization

For all UCM objects except baselines, no special identity is required. For baselines and all non-UCM objects, you must have one of the following identities:

Object creator (except for replicas; this only matters for branch instances)
Object owner (except for replicas)
VOB owner
root (UNIX and Linux)
Member of the ClearCase administrators group (Windows)

Locks


Object whose mastership is changing	Locks on these objects cause the chmaster command to fail
Element	Element, element type, VOB
Branch	Branch, branch type, VOB
Type object	Type object, VOB
Hyperlink	Hyperlink type, VOB
Baseline	Baseline, VOB, replica, components associated with the baseline
Stream	Stream, activity
Component	Component, VOB, replica
Policy	Policy, VOB
Rolemap	Rolemap, VOB

Mastership

Your current replica must master the object. Using both –all and –obsolete_replica overrides this restriction, but you must not use the –obsolete_replica option except in special circumstances. (See the description of the –all option.)

Other restrictions

You cannot transfer mastership of a branch if either of these conditions exist:

There are reserved checkouts on that branch.
There are unreserved checkouts on that branch made without the –nmaster option.

Options and arguments

Event records and comments

Default: Creates one or more event records, with commenting controlled by your .clearcase_profile file (default: –nc). See the comments reference page. Comments can be edited with chevent.
–c/omment comment | –cfi/le comment-file-pname |–cq/uery | –cqe/ach | –nc/omment: Overrides the default with the option you specify. See the comments reference page.

Specifying the objects

Default

None.

master-replica-selector object-selector ...

Transfers mastership of objects specified with object-selector to the replica specified with master-replica-selector. Specify master-replica-selector in the form [replica:]replica-name[@vob-selector].

Table for master-replica-selector object-selector
`replica-name`	Name of the replica (displayed with lsreplica)
`vob-selector`	VOB family of the replica; can be omitted if the current working directory is within the VOB. Specify `vob-selector` in the form [vob:]`pname-in-vob`
	`pname-in-vob`	Pathname of the VOB tag (whether or not the VOB is mounted) or of any file system object within the VOB (if the VOB is mounted)

Specify object-selector in one of the following forms:

Table for object-selector
`vob-selector`	vob:`pname-in-vob` where `pname-in-vob`
		Pathname of the VOB tag (whether or not the VOB is mounted) or of any file system object within the VOB (if the VOB is mounted)
`attribute-type-selector`	[attype:]`type-name`[@`vob-selector`]
`branch-type-selector`	[brtype:]`type-name`[@`vob-selector`]
`element-type-selector`	[eltype:]`type-name`[@`vob-selector`]
`hyperlink-type-selector`	[hltype:]`type-name`[@`vob-selector`]
`label-type-selector`	[lbtype:]`type-name`[@`vob-selector`]
`hlink-selector`	[hlink:]`hlink-id`[@`vob-selector`]
`oid-obj-selector`	oid:`object-oid`[@`vob-selector`]
`replica-selector`	[replica:]`replica-name`[@`vob-selector`]
`baseline-selector`	[baseline:]`baseline-name`[@`vob-selector`]
`component-selector`	[component:]`component-name`[@`vob-selector`]

[ –pname ] master-replica-selector branch-or-element-pname ...

Transfers mastership of the specified branches or elements to the replica specified with master-replica-selector. A branch pathname takes the form element-name@@/branch..., for example, cmdsyn.c@@/main/bugfix, and an element pathname takes the form element-name@@, for example, cmdsyn.c@@. If branch-or-element-pname has the form of an object selector, you must include the –pname option to indicate that pname is a pathname.

–str/eam [ –ove/rride ] master-replica-selector stream-selector ...

Transfers mastership of the specified streams and their associated objects to the replica specified with master-replica-selector. Specify stream-selector in the following form:

Table
`stream-selector`	[stream:]`stream-name`[@`vob-selector`]

Use the –override option only if the chmaster –stream command fails. With –override, chmaster attempts to transfer mastership of objects whose mastership was not transferred during the original invocation of the command. For more information, see the ClearCase MultiSite Administrator's Guide.

–a/ll [ –obsolete_replica old-replica-selector ] [ –l/ong ] [ –vie/w view-tag ] master-replica-selector

Important:

Incorrect use of the –obsolete_replica form of the command can lead to divergence among the replicas in a family.

Transfers to master-replica-selector mastership of all objects that are located in and mastered by the current replica. (The chmaster command determines the current replica by using the vob-selector that you specify as part of master-replica-selector. If you do not include a vob-selector, chmaster uses the replica containing the current working directory.)

If errors occur, the command continues, but after finishing, it reports that not all mastership changes succeeded.

With –long, chmaster lists the objects whose mastership is changing.

With –view, chmaster uses the specified view as the view context.

With –obsolete_replica, chmaster transfers mastership of all objects in the replica specified with old-replica-selector. Also, chmaster associates nonmastered checkouts with the new replica. Use this form of chmaster only when replica old-replica-selector is no longer available (for example, was deleted accidentally). Before entering this command, you must make sure that old-replica-selector masters itself or is mastered by the replica that it last updated. Then, enter the chmaster command at the last-updated replica. You must also send update packets from the last-updated replica to all other remaining replicas in the family. For more information, see the rmreplica reference page.

Returning mastership of branches to default state

Default: None.
–def/ault [ –pname ] branch-pname ...: Transfers mastership of branch-pname to the replica that masters the branch type. If branch-pname has the form of an object selector, you must include the –pname option to indicate that branch-pname is a pathname.
–def/ault brtype-selector ...: Removes explicit mastership of branches that are mastered explicitly by the current replica and are instances of the type specified by brtype-selector.
Note:
You can use this command only at the replica that masters the branch type.

Examples

At replica boston_hub, transfer mastership of label type V1.0_BUGFIX to the sanfran_hub replica.
multitool chmaster sanfran_hub lbtype:V1.0_BUGFIX
Changed mastership of "V1.0_BUGFIX" to "sanfran_hub"
At replica sanfran_hub, transfer mastership of element list.c to the sydney replica.
multitool chmaster sydney list.c@@
Changed mastership of "list.c" to "sydney"
At replica sanfran_hub, transfer mastership of the stream v2.1.bl5 and its associated objects to the boston_hub replica.
multitool chmaster –stream boston_hub@/vobs_dev stream:v2.1.bl5@/vobs_dev
At the replica that is the master of replica sanfran_hub, make sanfran_hub self-mastering.
multitool chmaster sanfran_hub replica:sanfran_hub
Changed mastership of "sanfran_hub" to "sanfran_hub"

At replica buenosaires, transfer mastership of branch cache.c@@/main/v3_dev to boston_hub.

multitool chmaster boston_hub cache.c@@/main/v3_dev 
Changed mastership of branch "/vobs/dev/cache.c@@/main/v3_dev" to "boston_hub"

For all objects mastered by the current replica, transfer mastership to sanfran_hub.
multitool chmaster –all sanfran_hub
Changed mastership of all objects
Same as the preceding example, but have chmaster list each object whose mastership is changing, and specify a view context.
multitool chmaster –all –long sanfran_hub@/view/jtg/vobs_dev
Changed mastership of branch type sydney_main Changed mastership of label type SYDNEY_V2.0 Changed mastership of replica sydney Changed mastership of all objects
Return mastership of a branch to the replica that masters the branch type and then remove its explicit mastership.
At the replica that masters the branch:

multitool describe –fmt "%[master]p\n" brtype:v3_bugfix
boston_hub@\dev
multitool chmaster boston_hub@\dev \dev\acc.c@@\main\v3_bugfix
Changed mastership of branch "\dev\acc.c@@\main\v3_bugfix" to "boston_hub@\dev"
multitool syncreplica –export –fship boston_hub@\dev
Generating synchronization packet ccase-home-dir\var \shipping\ms_ship\outgoing\sync_bangalore_2006-08-19T09.33.02_3447_1 ...

At the replica that masters the branch type:
```
multitool syncreplica –import –receive 
Applied sync. packet ccase-home-dir/var/shipping/ms_ship/incoming
/sync_bangalore_2006-08-19T09.33.02_3447_1
to VOB /net/minuteman/vobstg/dev.vbs
multitool chmaster –default brtype:v3_bugfix 
Changed mastership of branch type "v3_bugfix" to "default"
```