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Perl wrapper around CA-SCM (Harvest) commands

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NAME

CASCM::Wrapper - Run CA-SCM (Harvest) commands

use CASCM::Wrapper;

# Initialize
my $cascm = CASCM::Wrapper->new();

# Set Context
$cascm->set_context(
    {
        # Set a global context.
        # This is applied to all commands where required
        global => {
            b  => 'harvest',
            eh => 'user.dfo',
        },

        # Set 'hco' specific context,
        #   applied only to hco commands
        hco => {
            up => 1,
            vp => '\repository\myapp\src',
            pn => 'Checkout Items',
        },

        # Similarly for 'hci'
        hci => {
            vp => '\repository\myapp\src',
            pn => 'Checkin Items',
            de => 'Shiny new feature',
        },

        # And 'hcp'
        hcp => {
            st => 'development',
            at => 'userid',
        },
    }
) or die $cascm->errstr;

# Create Package
my $pkg = 'new_package';
$cascm->hcp($pkg) or die $cascm->errstr;

# Checkout files
my @files = qw(foo.c bar.c);
$cascm->hco( { p => $pkg }, @files ) or die $cascm->errstr;

# Update Context
$cascm->update_context( { hci => { p => $pkg }, } ) or die $cascm->errstr;

# Checkin files
$cascm->hci(@files) or die $cascm->errstr;

DESCRIPTION

This module is a wrapper around CA Software Change Manager's (formerly known as Harvest) commands. It provides a perl-ish interface to setting the context in which each command is executed, along with optional loading of context from files as well as parsing output logs.

CONTEXT

The context is a hash of hashes which contain the following types of keys:

  • global

    This specifies the global context. Any context set here will be applied to every command that uses it.

    my $global_context = {
        global => {
            b  => 'harvest',
            eh => 'user.dfo',
        },
    };
    
  • command specific

    This provides a command specific context. Context set here will be applied only to those specific commands.

    my $hco_context = {
        hco => {
            up => 1,
            vp => '\repository\myapp\src',
            pn => 'Checkout Items',
        },
    };
    

The global and command context keys are synonymous with the command line options detailed in the CA-SCM Reference Manual. Options that do not require a value should be set to '1'. i.e. {hco => {up => 1} } is equivalent to hco -up. The methods are intelligent enough to apply only the context keys that are used by a command. For e.g. a global context of vp will not apply to hcp.

The common options i and di are not applicable and ignored for all commands. See "SECURITY"

The following methods are available to manage context

set_context($context)

Sets the context. Old context is forgotten. The argument provided must be a hash reference

update_context($context)

Updates the current context. The argument provided must be a hash reference

load_context($file)

This loads the context from an INI file. The root parameters defines the global context. Each sectional parameter defines the command specific context. Old context is forgotten.

# Load context file at initialization.
#   This will croak if it fails to read the context file
my $cascm = CASCM::Wrapper->new( { context_file => $file } );

# Alternatively
$cascm->load_context($file) or die $cascm->errstr;

This is a sample context file

# Sample context file

# Root parameters. These define the 'global' context
b  = harvest
eh = user.dfo

# Sectional parameters. These define the 'command' context

[hco]
    up = 1
    vp = /repository/myapp/src

[hcp]
    st = development

NOTE: This method requires Config::Tiny in order to read the context file.

get_context()

Returns a hash reference of current context

my $context = $cascm->get_context();
use Data::Dumper;
print Dumper($context);

You can also get a command specific context by passing the command as an argument

my $hco_context = $cascm->get_context('hco');
use Data::Dumper;
print Dumper($hco_context);

CA-SCM METHODS

Almost every 'h' command that uses a context is supported. The command names are synonymous with the methods used to invoke them.

Every method accepts two optional arguments. The first is an hash reference that overrides/appends to the context for that method. This allows setting a context only for that specific method call. The second is an array of arguments that is passed on to the 'h' command. Any arguments provided is passed using the '-arg' option.

# No parameters. Everything required is already set in the context
$cascm->hdlp() or die $cascm->errstr;

# Array of arguments
$cascm->hci( @files ) or die $cascm->errstr;

# Override/Append to context
$cascm->hci( { p => 'new_package' }, @files ) or die $cascm->errstr;

The following CA-SCM commands are available as methods

hap
har
hci
hco
hcp
hdp
hdv
hft
hlr
hlv
hpg
hpp
hri
hrt
hsv
hup
hcbl
hchu
hcpj
hdlp
hspp
hsql
hudp
hfatt
hsmtp
hsync
hccmrg
hdelss
hexecp
hmvitm
hmvpkg
hmvpth
hrnitm
hrnpth
haccess
hcrrlte
hexpenv
hgetusg
himpenv
hrmvpth
hsigget
hsigset
htakess
hucache
husrmgr
husrunlk
hchgtype
hcmpview
hcropmrg
hcrtpath
hdbgctrl
hpkgunlk
hppolget
hppolset
hrefresh
hrepedit
hrepmngr
hauthsync
hformsync

SECURITY

This module uses the di option for executing CA-SCM commands. This prevents any passwords from being exposed while the command is running. The temporary di file is deleted irrespective if the outcome of the command.

DRY RUN

The CASCM methods can be called in a dry run mode. Where the method returns the full command line, without executing anything. This can be useful for debugging.

$cascm = CASCM::Wrapper->new( { dry_run => 1 } );
$cascm->set_context($context);
$cmd = $cascm->hsync();
print "Calling hsync() would have executed -> $cmd";

dry_run can also be toggled using contexts. For e.g.,

$cascm->hsync({dry_run => 1,});

LOGGING

Since CA-SCM commands output only to log files, this module allows parsing and logging of a command's output. Log::Any is required to use this feature, which in turn allows you to use any (supported) Logging mechanism. When using this, any o or oa options specified in the context will be ignored. Your scripts will need to load the appropriate Log::Any::Adapter to capture the log statements. The CA-SCM log is parsed and the messages are logged either as INFO, WARN or ERROR.

# Using Log4perl

use CASCM::Wrapper;
use Log::Log4perl;
use Log::Any::Adapter;

Log::Log4perl->init('log4perl.conf');
Log::Any::Adapter->set('Log4perl');

# Get logger
my $log = Log::Log4perl->get_logger();

# Set parse_logs to true. This will croak if Log:Any is not found.
my $cascm = CASCM::Wrapper->new( { parse_logs => 1 } );

# You can also set the logging category
#    This is currently available with Log4perl only
$cascm->parse_logs('mylogger');

# Set Context
my $context = { ... };
$cascm->set_context($context);

# Calling the method automatically will parse the log output into the Log4perl object
# The output is also logged in the 'CASCM::Wrapper' category.

$cascm->hco(@files) or die $cascm->errstr;

ERROR HANDLING

All methods return true on success and undef on failure. The error that most likely caused the last failure can be obtained by calling the errstr method.

DEPENDENCIES

CA-SCM r12 (or higher) client. Harvest 7.1 might work, but has not been tested.

The CA-SCM methods depends on the corresponding commands to be available in the PATH

At least Perl 5.6.1 is required to run.

Optionally, Config::Tiny is required to read context files

Optionally, Log::Any and Log::Any::Adapter is required to parse CA-SCM log files

SEE ALSO

CA Software Change Manager

BUGS AND LIMITATIONS

Please report any bugs or feature requests to bug-cascm-wrapper@rt.cpan.org, or through the web interface at http://rt.cpan.org/Public/Dist/Display.html?Name=CASCM-Wrapper

AUTHOR

Mithun Ayachit mithun@cpan.org

LICENSE AND COPYRIGHT

Copyright (c) 2013, Mithun Ayachit. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

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