add a BlockDevice role

1 files changed, 197 insertions, 0 deletions

diff --git a/lib/ManaTools/Shared/disk_backend/BlockDevice.pm b/lib/ManaTools/Shared/disk_backend/BlockDevice.pm
new file mode 100644
index 00000000..3221e740
--- /dev/null
+++ b/lib/ManaTools/Shared/disk_backend/BlockDevice.pm
@@ -0,0 +1,197 @@
+# vim: set et ts=4 sw=4:
+package ManaTools::Shared::disk_backend::BlockDevice;
+
+#============================================================= -*-perl-*-
+
+=head1 NAME
+
+    ManaTools::Shared::disk_backend::BlockDevice - a BlockDevice Moose Role
+
+=head1 SYNOPSIS
+    package Foo;
+
+    with 'ManaTools::Shared::disk_backend::BlockDevice';
+
+    1;
+
+    ...
+
+    my $f = Foo->new();
+    $f->prop('dev', 'maj:min');
+    $f->sync_majorminor();
+    my $major = $f->major();
+    my $minor = $f->minor();
+
+
+=head1 DESCRIPTION
+
+    This Role is an collection of BlockDevice in the backend to manadisk
+
+=head1 SUPPORT
+
+    You can find documentation for this Role with the perldoc command:
+
+    perldoc ManaTools::Shared::disk_backend::BlockDevice
+
+
+=head1 AUTHOR
+
+    Maarten Vanraes <alien@rmail.be>
+
+=head1 COPYRIGHT and LICENSE
+
+Copyright (c) 2015 Maarten Vanraes <alien@rmail.be>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2, as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+=head1 METHODS
+
+=cut
+
+use Moose::Role;
+
+## object DATA
+has 'devicemm' => (
+    is => 'ro',
+    isa => 'ArrayRef',
+    default => sub {
+        return [];
+    }
+);
+
+has 'devicepath' => (
+    is => 'ro',
+    isa => 'Str',
+    lazy => 1,
+    default => sub {
+        my $self = shift;
+        return '/dev/'. $self->id();
+    }
+);
+
+#=============================================================
+
+=head2 major
+
+=head3 OUTPUT
+
+    Int or undef
+
+=head3 DESCRIPTION
+
+    this method returns the major
+
+=cut
+
+#=============================================================
+sub major {
+    my $self = shift;
+    my $mm = $self->devicemm();
+    if (scalar(@{$mm}) > 1) {
+        return $mm->[0];
+    }
+    return undef;
+}
+
+#=============================================================
+
+=head2 minor
+
+=head3 OUTPUT
+
+    Int or undef
+
+=head3 DESCRIPTION
+
+    this method returns the minor
+
+=cut
+
+#=============================================================
+sub minor {
+    my $self = shift;
+    my $mm = $self->devicemm();
+    if (scalar(@{$mm}) > 1) {
+        return $mm->[1];
+    }
+    return undef;
+}
+
+#=============================================================
+
+=head2 is_device
+
+=head3 OUTPUT
+
+    1 if equal, 0 if not
+
+=head3 DESCRIPTION
+
+    this method checks if it's a certain device
+
+=cut
+
+#=============================================================
+sub is_device {
+    my $self = shift;
+    my $major = shift;
+    my $minor = shift;
+
+    return $self->major() == $major && $self->minor() == $minor;
+}
+
+#=============================================================
+
+=head2 clear_device
+
+=head3 DESCRIPTION
+
+    this method clears the devicemm
+
+=cut
+
+#=============================================================
+sub clear_device {
+    my $self = shift;
+    my $mm = $self->devicemm();
+    # clear out the array, keep the ref
+    while (scalar(@{$mm}) > 0) {
+        pop @{$mm};
+    }
+}
+
+#=============================================================
+
+=head2 sync_majorminor
+
+=head3 DESCRIPTION
+
+    this method resets the major and minor from the dev Property
+
+=cut
+
+#=============================================================
+sub sync_majorminor {
+    my $self = shift;
+    # clear out the array, keep the ref
+    $self->clear_device();
+    if ($self->has_prop('dev')) {
+        my @mm = split(':', $self->prop('dev'));
+        if (scalar(@mm) > 1) {
+            push @{$self->devicemm()}, $mm[0], $mm[1];
+        }
+    }
+}
+
+1;