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ClearCase-Wrapper-MGi-0.21
River stage zero No dependents
/ ClearCase::Wrapper::MGi

NAME

ClearCase::Wrapper::MGi Configuration

SYNOPSIS

Four methods, to configure different aspects:

##:BranchOff: root in the config spec
.clearcase_profile.pl
environment variables
variables in the configuration modules

DESCRIPTION

The extra directory contains files which can be used to configure the wrapper for specific needs, either on a site on a user basis.

VobPathConv.pm

VobPathConv.pm (and its pod file) does however not require any configuration and may be used as such. I may even consider to extract it and publish it as a separate package in its own, albeit modest, right.

It offers functions to convert paths from Windows to Unix, using the registry to map the tags in associated regions.

It must be installed in the @INC path as ClearCase::VobPathConv.

ForceLock

The remaining files are mostly concerned with locking and unlocking label types owned by other people (colleagues, members of the same group, vob owner...).

The lack of such an ability is considered a bug in ClearCase, and is the object of an RFE (currently rejected...). It defeats the use of locking in general.

ForceLockSudo.pm implements the simplest, safest and most efficient solution, from unix. As its alternatives, dealing with cases in which this superior solution could not be used, it is meant to be installed in the @INC path, under a ClearCase directory, and accessed via an environment variable

  FORCELOCK=ClearCase::ForceLockSudo

This is so its use would not penalize functions which do not require locking. Two other versions are provided for now, one for unix, and one for Windows (and cygwin):

  FORCELOCK=ClearCase::ForceLockUnix #Unix
  FORCELOCK=ClearCase::ForceLock     #Windows

These can be used as examples or a templates. They require some customization. The two latter build upon locklbtype, a standalone script, to be installed suid enabled, owned by an account, which is itself authorized in the ssh configurations of the respective vob owners of all vobs in the local region, to run locking commands. It acts as a switch, allowing to simplify the maintainance of the ~/.ssh/authorized_keys files.

The customization it requires is mostly the name of the host running an sshd daemon which it will use. One needs to avoid using localhost here, so that different host keys do not overwrite each other in the ~/.ssh/known_hosts files.

One may also set the name of the log used to save the identity of the unlocking users (for lock events, this is saved in a comment of the locks). The paths to ssh and cleartool are likely to be satisfying.

In order to use this script, you need to define a pair of functions, for locking and unlocking.

The unix version of the ClearCase::ForceLock module, is meant to invoke locklbtype via a system call, therefore using the suid bit mechanism offered by unix shells. The only customization is the path to the locklbtype utility.

In a Windows environment, the related module fills the same role, but invokes the suid script on a unix host, via ssh.

It depends on a long list of modules, which I could successfully install on: cygwin 1.7 / perl 5.10 / libgmp-devel 4.3.1-1, libssh2 and which I don't desperate yet (failing for now on Math::GMP) to install on: Windows Vista / Active perl 5.10 / GMP-4.1.2

  Digest-HMAC-1.01
  Class-ErrorHandler-0.01
  Convert-ASN1-0.22
  Crypt-CBC-2.30
  Crypt-DES-2.05
  Crypt-Blowfish-2.10
  Crypt-DES_EDE3-0.01
  Convert-PEM-0.07
  Digest-SHA1-2.1
  Data-Buffer-0.04
  Class-Loader-2.03
  Convert-ASCII-Armour-1.4
  Digest-MD2-2.03
  Sort-Versions-1.5
  Tie-EncryptedHash-1.24
  Digest-BubbleBabble-0.01
  String-CRC32-1.4
  Math::GMP-2.05
  Math::BigInt::GMP-1.24
  Math::BigInt-1.89
  Net::SSH::Perl-1.34

Note that these are just the versions I use, and which work for me. I cannot claim that this list is a minimal requirement.

.clearcase_profile.pl

An example of .clearcase_profile.pl sets the ipc mode for all commands apart for setview (unavailable then, assuming the wrapper itself is used from a vob).

An other setting for this file is:

  $ClearCase::Wrapper::MGi::global = 1;

This setting drives mklbtype and mkbrtype to create global types (including the metadata types) in vobs having an admin vob.

This used to be the default with ClearCase::Wrapper::DSB.

environment variables

Currently, only one such variable (see earlier):

  FORCELOCK