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https://github.com/token2/snapd.git
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79c5ac14b2
* many: remove usages of deprecated io/ioutil package Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * .golangci.yml: remove errcheck ignore rule for io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * run-checks: prevent new usages of io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> --------- Signed-off-by: Miguel Pires <miguel.pires@canonical.com>
99 lines
2.8 KiB
Go
99 lines
2.8 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2016 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package client
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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)
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// InternalSnapctlCmdNeedsStdin returns true if the given snapctl command
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// needs data from stdin
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func InternalSnapctlCmdNeedsStdin(name string) bool {
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switch name {
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case "fde-setup-result":
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return true
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default:
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return false
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}
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}
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// SnapCtlOptions holds the various options with which snapctl is invoked.
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type SnapCtlOptions struct {
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// ContextID is a string used to determine the context of this call (e.g.
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// which context and handler should be used, etc.)
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ContextID string `json:"context-id"`
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// Args contains a list of parameters to use for this invocation.
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Args []string `json:"args"`
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}
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// SnapCtlPostData is the data posted to the daemon /v2/snapctl endpoint
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// TODO: this can be removed again once we no longer need to pass stdin data
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// but instead use a real stdin stream
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type SnapCtlPostData struct {
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SnapCtlOptions
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Stdin []byte `json:"stdin,omitempty"`
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}
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type snapctlOutput struct {
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Stdout string `json:"stdout"`
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Stderr string `json:"stderr"`
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}
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// protect against too much data via stdin
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var stdinReadLimit = int64(4 * 1000 * 1000)
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// RunSnapctl requests a snapctl run for the given options.
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func (client *Client) RunSnapctl(options *SnapCtlOptions, stdin io.Reader) (stdout, stderr []byte, err error) {
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// TODO: instead of reading all of stdin here we need to forward it to
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// the daemon eventually
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var stdinData []byte
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if stdin != nil {
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limitedStdin := &io.LimitedReader{R: stdin, N: stdinReadLimit + 1}
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stdinData, err = io.ReadAll(limitedStdin)
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if err != nil {
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return nil, nil, fmt.Errorf("cannot read stdin: %v", err)
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}
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if limitedStdin.N <= 0 {
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return nil, nil, fmt.Errorf("cannot read more than %v bytes of data from stdin", stdinReadLimit)
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}
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}
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b, err := json.Marshal(SnapCtlPostData{
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SnapCtlOptions: *options,
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Stdin: stdinData,
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})
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if err != nil {
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return nil, nil, fmt.Errorf("cannot marshal options: %s", err)
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}
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var output snapctlOutput
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_, err = client.doSync("POST", "/v2/snapctl", nil, nil, bytes.NewReader(b), &output)
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if err != nil {
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return nil, nil, err
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}
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return []byte(output.Stdout), []byte(output.Stderr), nil
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}
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