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implement file-read api call via guest-agent
this api call reads a file via the guest agent, (in 1MB chunks) but is limited to 16MiB (for now) if the file is bigger, the output gets truncated and a 'truncated' flag is set in the return object Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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@ -12,6 +12,9 @@ use JSON;
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use base qw(PVE::RESTHandler);
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# max size for file-read over the api
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my $MAX_READ_SIZE = 16 * 1024 * 1024; # 16 MiB
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# list of commands
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# will generate one api endpoint per command
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# needs a 'method' property and optionally a 'perms' property (default VM.Monitor)
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@ -114,6 +117,7 @@ __PACKAGE__->register_method({
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push @$cmds, qw(
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exec
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exec-status
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file-read
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set-user-password
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);
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@ -362,4 +366,76 @@ __PACKAGE__->register_method({
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return $res;
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}});
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__PACKAGE__->register_method({
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name => 'file-read',
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path => 'file-read',
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method => 'GET',
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protected => 1,
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proxyto => 'node',
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description => "Reads the given file via guest agent. Is limited to $MAX_READ_SIZE bytes.",
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permissions => { check => [ 'perm', '/vms/{vmid}', [ 'VM.Monitor' ]]},
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parameters => {
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additionalProperties => 0,
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properties => {
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node => get_standard_option('pve-node'),
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vmid => get_standard_option('pve-vmid', {
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completion => \&PVE::QemuServer::complete_vmid_running }),
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file => {
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type => 'string',
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description => 'The path to the file'
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},
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},
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},
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returns => {
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type => 'object',
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description => "Returns an object with a `content` property.",
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properties => {
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content => {
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type => 'string',
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description => "The content of the file, maximum $MAX_READ_SIZE",
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},
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truncated => {
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type => 'boolean',
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optional => 1,
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description => "If set to 1, the output is truncated and not complete"
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}
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},
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},
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code => sub {
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my ($param) = @_;
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my $vmid = $param->{vmid};
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my $qgafh = agent_cmd($vmid, "file-open", { path => $param->{file} }, "can't open file");
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my $bytes_left = $MAX_READ_SIZE;
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my $eof = 0;
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my $read_size = 1024*1024;
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my $content = "";
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while ($bytes_left > 0 && !$eof) {
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my $read = PVE::QemuServer::vm_mon_cmd($vmid, "guest-file-read", handle => $qgafh, count => int($read_size));
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check_agent_error($read, "can't read from file");
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$content .= decode_base64($read->{'buf-b64'});
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$bytes_left -= $read->{count};
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$eof = $read->{eof} // 0;
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}
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my $res = PVE::QemuServer::vm_mon_cmd($vmid, "guest-file-close", handle => $qgafh);
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check_agent_error($res, "can't close file", 1);
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my $result = {
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content => $content,
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'bytes-read' => ($MAX_READ_SIZE-$bytes_left),
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};
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if (!$eof) {
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warn "agent file-read: reached maximum read size: $MAX_READ_SIZE bytes. output might be truncated.\n";
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$result->{truncated} = 1;
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}
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return $result;
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}});
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1;
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