99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
// Copyright 2022 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package local
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import (
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"bufio"
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"bytes"
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"context"
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"errors"
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"io"
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"os/exec"
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"time"
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)
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// Run the input command via pipe with given arguments, stdout of the pipe is passed to input parser
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// argument.
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func runPipe(ctx context.Context, timeout time.Duration, cmdName string, args []string, parser func(r io.Reader)) (err error, stdErr string) {
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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cmd := exec.CommandContext(ctx, cmdName, args[0:]...)
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errorBuf := bytes.Buffer{}
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cmd.Stderr = &errorBuf
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return err, errorBuf.String()
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}
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if err = cmd.Start(); err != nil {
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return err, errorBuf.String()
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}
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parser(stdout)
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if err = cmd.Wait(); err != nil {
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return err, errorBuf.String()
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}
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return nil, ""
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}
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// Run input command, stdout is passed via out parameter to user, if error the stderr is provided via
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// stdErr string to the user.
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func run(ctx context.Context, timeout time.Duration, cmdName string, args []string) (out *bytes.Buffer, err error, stdErr string) {
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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cmd := exec.CommandContext(ctx, cmdName, args[0:]...)
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errorBuf := bytes.Buffer{}
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outputBuf := bytes.Buffer{}
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cmd.Stderr = &errorBuf
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cmd.Stdout = &outputBuf
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if err = cmd.Run(); err != nil {
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return nil, err, errorBuf.String()
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}
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return &outputBuf, nil, ""
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}
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// lineScanner
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//
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// Map output lines to strings, with expected number of
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// lines
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type lineScanner struct {
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Lines []string
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}
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// Parse into lines
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func (l *lineScanner) Parse(s *bufio.Scanner) error {
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i := 0
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for s.Scan() {
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if i < len(l.Lines) {
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l.Lines[i] = s.Text()
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} else {
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i++
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break
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}
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i++
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}
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if i != len(l.Lines) {
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return errors.New("cmd: incorrect number of lines")
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}
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return nil
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}
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func newLineScanner(numLines int) *lineScanner {
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out := &lineScanner{Lines: make([]string, numLines)}
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return (out)
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}
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