Changes

#-*-cperl-*-
#
# $Id: Changes,v 11.1 2004/11/18 17:24:53 wpm Exp $
#
# (c) 2003-2004 Morgan Stanley and Co.
# See ..../src/LICENSE for terms of distribution.
#

=head1 CHanges in 1.9

=head1 Enhancements

A new argument is supported by AFS::Command::Base->new():

    my $vos = AFS::Command::VOS->new( timestamps => 1 );

This will result in ISO timestamps being prepended to each line of
output when it is collected into the $vos->errors().  This is useful
for profiling the performance of operations such as vos release:

    my $result = $vos->release
      (
       id		=> 'somevol',
       cell		=> 'somecell',
      ) || die $vos->errors();

When this works, the $vos->errors() will have the verbose output,
which can be logged even in the successful case, for diagnostics.
Here's an example for a failure:

    [2004-11-18 17:20:36] Could not lock the VLDB entry for the volume 536998569.
    [2004-11-18 17:20:36] VLDB: no permission access for call
    [2004-11-18 17:20:36] Error in vos release command.
    [2004-11-18 17:20:36] VLDB: no permission access for call

=head1 Changes in 1.8

=head1 Bug Fixes

=head2 vos examine did not pick up the LOCKED flag

The code to parse the VLDB header was missing the LOCKED flag, if it
was present, so this attribute was not being set properly.  It is now.

=head2 pts membership error checking was bogus

Well, it still is bogus, actually, since the code has to deal with the
fact that pts has never produced meaningful return codes, so a failed
pts membership command can still exit 0, and we have to figure out if
it failed by other means.  This is done by looking for the known error
messages that pts prints out, which is a good example of why parsing
the ASCII test output of commands like this is a weak architecture.

=head1 Changes in 1.7

=head1 Enhancements

=head2 Boolean flags can be turned off, as well as on

If an argument to a method (and its corresponding command line
argument) doesn't take a value, it is treated like a Boolean flag.
However, the code used to assume that the existence of a Boolean key
in the argument list implied the Boolean argument was always true.

Now, the truth of the arguments I<value> is tested to determine if the
flag should be set on or off.  This makes it easy to have subroutines
that just blindly pass certain arguments along, without haing to test
them, and allows for much cleaner code.

For example:

    my $result = $vos->release
      (
       name		=> $name,
       force		=> $force,
      );

Will work as you probably expected it to, namely if $force is zero, it
will NOT be passed to the "vos release" command.  In previous
releases, regardless of the value of $force, the mere existence of the
force key in the argument hash would have caused the -force option to
be used.

=head1 Bugs

=head2 vos examine by numeric ID did not parse Volume Headers

The code to parse the volume headers in the output from "vos examine"
was looking for a pattern match based on the "id" argument.  However,
the headers always print the name first, and we were assuming that the
id argument was the volume name, when it can also be the volume ID.

The parsing is less strict now, and works for both a volume name od a
numeric ID.

=head1 Changes in 1.6

=head1 Enhancements

=head1 AFS::Object::VolumeHeader: new attribute 'attached'

When a volume's status is "offline", there is really more than one
status the volume can be in.  A volume might be unattached, and
offline, or it might be attached, but adminitratively offline.  For
example, "vos offline" put a vlume in the latter state, and if for
some reason there are two volumes with the same ID on the same
fileserver, they will both be attached (if possible), but only the
first one encountered will be brought online.

Changing the value of status would been a non-backwards compatible
change, and caused some subtle problems for some applications.  Rather
than introduce such a change, I have chosen to represent this state
with an additional attribute "attached", which is just a Boolean,
indicating whether or not the volume is attached.

=head1 Bugs

=head1 Changes in 1.5

=head1 Enhancements

=head2 Principal names, as user supplied arguments, are lowercased

As a convenience, when PTS names are passed to methods like
getUserByName(), they will be lower-cased before looking up the user,
or group.  Since PTS is a case-insensitive database, this will avoid
the need for applications to lc() some strings, although not in all
cases.

For example, you can pass a mixed case string to pts->creategroup(),
and then use the same string to query the resulting AFS::Object::Group
object using getGroupByName().

The object's "group" attribute, however, will be in lower case, since
that will be the value returned by the pts command itself.

=head2 AFS::Command::VOS->restore arguments added

Documentation for two important new vos restore arguments was added to
the documentation (-creation and -lastupdate).  These options are only
available in a patch to vos, which should be in one the next two major
OpenAFS 1.2.X releases.

=head1 Bugs

=head2 AFS::Object::VolumeHeader 'accesses' attribute was incorrect

The actual attribute on the objects was named "access".  Oops.  The
attribute was changed to "accesses" to match the documentation, and
the string that is parsed in vos output.

=head1 Changes in 1.4

=head1 Enhancements

=head2 Test suite is disabled by default.

There is a well intentioned effort to automatically test all new
submissions to CPAN (see http://testers.cpan.org).  Unfortunately, the
AFS-Command package can't be tested automatically, since it requires a
fair amount of configuration.  You have to specify a cell name, some
fileserver names and partitions, etc.

By default, the tests will all be skipped if the configured cell name
in the CONFIG file has not been modified, thus allowing the automated
CPAN testing to continue, automatically, without the author getting a
bunch of bogus emails.

=head1 Bugs

=head2 Volume status value inconsistency

!!!!!!!! WARNING !!!!!!!!

This change is NOT backwards compatible with previous releases, so
verify that your code handles the new, consistent values correctly.

The "status" field returned from either vos->examine() or
vos->listvol(), in previous releases, had inconsistent values. When a
volume is online, the status would be one of:

    online
    On-line

Likewise, when offline, one of:

    offline
    Off-line

These values have all been normalized to: online, offline

=head2 AFS::Command::VOS->examine parses busy and offline messages

When a volume is busy or can not be attached, "vos examine" will be
unable to display the volume headers.  Instead, a one line message is
printed, such as one of the following:

    **** Volume 123456789 is busy ****
    **** Could not attach volume 123456789 ****

The examine method now parses these, and the AFS::Object::VolumeHeader
object will have only the 'id' and 'status' attributes.  Previously,
those lines were incorrectly parsed and the 'name' attribute set to
'****', which is pretty obviously wrong.




=head1 Changes in 1.3

=head1 Enhancements

=head2 AFS::Command::VOS->release support both -f and -force

Someone at some point changed vos release's force argument from -f to
-force.  API calls written with one of those will not work with a vos
binary that doesn't agree on the choice of force option.  This would
have require developers to write code like this:

   $vos->release
     (
      id		=> $id,
      cell		=> $cell,
      ( $vos->supportsArgument('release','force') ?
        ( force		=> 1 ) :
        ( f		=> 1 )
      ),
     );

OK, that's the authors twisted way of doing it, and it seems like
needless complexity.  Both f and force are now supported as options,
using a simply alias mechanism to translate from one to the other,
based on what is supported by the vos binary.

The documentation hasn't been changed, since you can use 'force' in
all cases, and since that is the newer of the two, the docs will stay
as they are.  The fact that your vos binary really wants 'f' is hidden
from you, and will stay that way.

=head1 Bugs

=head2 AFS::Command::BOS->listhosts

The returned object has a cell attribute, as well as the hosts
attribute, but the docs forgot to mention this.




=head1 Changes in 1.2

=head1 Enhancements

=head2 AFS::Command::VOS->offline() and ->online()

Both of these "hidden" vos commands are now supported by the API.
These commands are part of the vos command suite, but they do not show
up in the output of "vos help".

=head1 Bugs



=head1 Changes in 1.1

=head1 Enhancements

=head2 AFS::Command::VOS->status()

This method now parses the individual transaction stanzas, and the API
provides access to objects that encapsulate each of them.  So, instead
of just finding out how many transactions are active, you can analyze
each of them in detail.

=head2 AFS::Object::VLDB data is now keyed on volume ID, as well as name

This changes the way the AFS::Object::VLDB data can be extracted.  In
1.0, the API allowed AFS::Object::VLDBEntry object to be queried only
by name, but 3 new methods calls allow this data to be queried by
numeric ID as well as name:

    getVLDBEntryById($id)
    getVLDBEntryByName($name)
    getVolumeIds()

The API for getVLDBEntry has changed, and the single argument usage:

    getVLDBEntry($name)		# DEPRECATED!!!!

has been deprecated.  If warnings are enabled (perl -w), then the API
will carp at you.  In the next release (1.2), that usage will no
longer be supported.  Upgrade your code, or pay the price.

The new usage of getVLDBEntry is one of:

    getVLDBEntry( name => $name )
    getVLDBEntry( id => $id )

The internal method _addEntry() now manages the data by id as well as
name, but you're not supposed to know that anyway...

=head1 Bugs

=head2 AFS::Command::BOS->status

When querying a specific instance, if it wasn't there, the API would
try to add an undefined instance object to the result, and croak.
Now, you just get a result object with no instances.

=head2 AFS::Command::FS->(several methods)

If you pass a list of paths to methods such as whichcell(), then the
error handling was a bit intrusive.  The way it used to work, in 1.0,
was to return an error if we didn't see output for one or more of the
paths.  Now, the code is more forgiving, and if have no idea what
happened for one of the given paths, we'll return a Path object for
that path which has a generic error.

=head2 AFS::Command::FS->lsmount

The "File 'foo' doesn't exist" error message wasn't trapped as a
recognized error.  It is now.

=head2 AFS::Command::FS->sysname

The pattern matching was a bit greedy and the trailing single quote
was showing up in the returned sysname value.

=cut