[libvirt] [libvirt-tck 2/3] Add module for hooks testing

[Daniel P. Berrange]

On Mon, Oct 18, 2010 at 07:18:08AM +0800, Osier Yang wrote:
> To test daemon, qemu, lxc hook.
> 
> * lib/Sys/Virt/TCK/Hooks.pm
> ---
>  lib/Sys/Virt/TCK/Hooks.pm |  262 +++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 262 insertions(+), 0 deletions(-)
>  create mode 100644 lib/Sys/Virt/TCK/Hooks.pm
> 
> diff --git a/lib/Sys/Virt/TCK/Hooks.pm b/lib/Sys/Virt/TCK/Hooks.pm

> +sub libvirtd_status {
> +    my $self = shift;
> +    my $status = `service libvirtd status`;
> +    my $_ = $status;
> +
> +    if (/running/) {
> +        $self->{libvirtd_status} = 'running';
> +    } elsif (/stopped/) {
> +        $self->{libvirtd_status} = 'stopped';
> +    }
> +
> +    return $self;
> +}

> +sub service_libvirtd {
> +    my $self = shift;
> +    my $action = $self->{action};
> +
> +    truncate $self->{log_name}, 0 if -f $self->{log_name};
> +
> +    die "failed on $action daemon" if system "service libvirtd $action"; 
> +
> +    $self->libvirtd_status;
> +}

Is there any way we can avoid having to start/stop libvirtd
for this testing ?  The general goal of the TCK is that it
is testing an existing deployment, so it should be expecting
that libvirtd is already up & running in a desired configuration.

If we have to stop/start libvirtd, then the test script using
these APIs will need to be protected to make sure it only
runs when used with 'qemu:///system' or 'lxc://'.  ie is skipped
with qemu:///session or vmware, or virtualbox, etc

> +
> +sub compare_log {
> +    my $self = shift;
> +    
> +    my $expect_log = $self->{expect_log};
> +    my $log_name = $self->{log_name};
> +
> +    open LOG, "< $log_name" or die "failed on opening $log_name: $!";
> +    
> +    my @lines = <LOG>;
> +
> +    return 0 unless @lines;
> +
> +    chomp foreach @lines;
> +    my $actual_log = join "\n", @lines;
> +
> +    close LOG;

Little perl black magic tip for you.... 

If you want to read the entire file contents into a single
string, then you can do

  open LOG, "<$log_name";
  local $/ = undef;
  my $actual_log = <LOG>;
  close LOG;

'$/' is the line separator. By setting it to 'undef' we tell
Perl that there is no line separator, so it will immediately
read until end of file :-)  BTW see 'man perlvar' for this 
particular example


Daniel
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