Eric Blake wrote:
> I was getting failures of domain/103-blockdev-save-restore.t when
> connecting as qemu:///session, since my uid could stat /dev/sdb but
> not open it. That test now skips for unprivileged users, as well as
> adds a layer of sanity checking against expected size to avoid
> trashing the wrong device.
>
> * conf/default.cfg (host_block_devices): Document optional size.
> * lib/Sys/Virt/TCK.pm (get_host_block_device): If optional size is
> supplied, skip a device that does not match. Also, avoid devices
> that can't be opened.
> ---
>
> Changes from v2:
> + guarantee that the device can be opened by the current user, even if
> the .cfg file used the older path-only configuration
ACK.
> +# Each block device is either a raw path
> # /dev/vdb
> +# or a path plus size in 1k blocks, as in /proc/partitions, to avoid
> +# trashing the wrong device
> +# {
> +# path = /dev/disk/by-id/usb-Generic_Flash_Disk_9B46E3C5-0:0
Much improved example.
With by-id/ and the verbose name, there should be no problem.
> +# size = 989184
> +# }
...
> - return $self->config("host_block_devices/[$devindex]", undef);
> + my $device = $self->config("host_block_devices/[$devindex]/path", undef);
> + my $kb_blocks = $self->config("host_block_devices/[$devindex]/size", 0);
> + my $match = 1;
> +
> + $device ||= $self->config("host_block_devices/[$devindex]", undef);
> +
> + # Filter out devices that the current user can't open.
> + sysopen(BLK, $device, O_RDONLY) or return undef;
> +
> + if ($kb_blocks) {
> + $match = sysseek(BLK, 0, SEEK_END) == $kb_blocks * 1024;
> + }
> + close BLK;
> +
> + return $match ? $device : undef;
> }
That looks fine and correct.
You could move the $kb_blocks definition "down" to where used.
though there's a good argument for keeping it near the
other config-getting statement. Either way is fine.
However, I find it more readable to group the two $device-setting
statements together:
my $device = $self->config("host_block_devices/[$devindex]/path", undef);
$device ||= $self->config("host_block_devices/[$devindex]", undef);
my $kb_blocks = $self->config("host_block_devices/[$devindex]/size", 0);
> + my $match = 1;
There is no reason to declare/set $match so early.
Move that down to where it's used.
Rather than an "if (...)" and a one-line {...} block,
I would write it this way: "syntax: less is always (more ;-) better"
my $match = 1;
$kb_blocks
and $match = sysseek(BLK, 0, SEEK_END) == $kb_blocks * 1024;
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