Re: [pve-devel] [PATCH/RFC v2 qemu-server 2/3] restore_vma_archive: get rid of oldtimeout handling

[Thomas Lamprecht <t.lamprecht@proxmox.com>]

On 12.08.20 12:01, Fabian Ebner wrote:
> Assume that the function is called within a worker not restricted by
> any timeout. This is true currently, because the only path leading to
> restore_vma_archive is via restore_file_archive being called within a
> worker by the create_vm API call.

you could branch on, or maybe even assert, the RESTEnvrionment is_worker()
helpers result, to tighten this assumption

> 
> Avoid generic timeout error message.
> 
> Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
> ---
> 
> New in v2
> 
>  PVE/QemuServer.pm | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
> index 7169006..794819b 100644
> --- a/PVE/QemuServer.pm
> +++ b/PVE/QemuServer.pm
> @@ -6162,7 +6162,6 @@ sub restore_vma_archive {
>  
>      $add_pipe->(['vma', 'extract', '-v', '-r', $mapfifo, $readfrom, $tmpdir]);
>  
> -    my $oldtimeout;
>      my $timeout = 5;
>  
>      my $devinfo = {};
> @@ -6261,9 +6260,9 @@ sub restore_vma_archive {
>  	    local $SIG{QUIT} =
>  	    local $SIG{HUP} =
>  	    local $SIG{PIPE} = sub { die "interrupted by signal\n"; };
> -	local $SIG{ALRM} = sub { die "got timeout\n"; };
> +	local $SIG{ALRM} = sub { die "got timeout reading device map\n"; };
>  
> -	$oldtimeout = alarm($timeout);
> +	alarm($timeout);
>  
>  	my $parser = sub {
>  	    my $line = shift;
> @@ -6274,11 +6273,7 @@ sub restore_vma_archive {
>  		my ($dev_id, $size, $devname) = ($1, $2, $3);
>  		$devinfo->{$devname} = { size => $size, dev_id => $dev_id };
>  	    } elsif ($line =~ m/^CTIME: /) {
> -		# we correctly received the vma config, so restore old timeout
> -		my $tmp = $oldtimeout || 0;
> -		$oldtimeout = undef;
> -		alarm($tmp);
> -
> +		alarm(0);
>  		&$print_devmap();
>  		print $fifofh "done\n";
>  		close($fifofh);
> @@ -6290,7 +6285,7 @@ sub restore_vma_archive {
>      };
>      my $err = $@;
>  
> -    alarm($oldtimeout) if $oldtimeout;
> +    alarm(0);
>  
>      $restore_deactivate_volumes->($cfg, $devinfo);
>  
>