wehub-resource-sync
88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
// Copyright 2019-2022 Dolthub, Inc.
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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 dolt_builder
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"os/exec"
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"strings"
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)
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var Debug bool
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const envDebug = "DEBUG"
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const maxCapturedOutputBytes = 64 * 1024
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func init() {
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if os.Getenv(envDebug) != "" {
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Debug = true
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}
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}
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func ExecCommand(ctx context.Context, name string, arg ...string) *exec.Cmd {
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e := exec.CommandContext(ctx, name, arg...)
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if Debug {
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e.Stdout = os.Stdout
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e.Stderr = os.Stderr
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}
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return e
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}
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// RunCommand runs cmd.
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//
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// When DEBUG is not set, stdout+stderr are captured and attached to any error so
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// failures have actionable output. When DEBUG is set, output streams directly to
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// the console.
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func RunCommand(cmd *exec.Cmd) error {
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_, err := RunCommandOutput(cmd)
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return err
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}
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// RunCommandOutput runs cmd and returns combined stdout+stderr output when DEBUG
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// is not set. When DEBUG is set, output streams directly and returned output is
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// nil.
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func RunCommandOutput(cmd *exec.Cmd) ([]byte, error) {
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if Debug {
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return nil, cmd.Run()
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}
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var buf bytes.Buffer
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cmd.Stdout = &buf
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cmd.Stderr = &buf
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err := cmd.Run()
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out := buf.Bytes()
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if err != nil {
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return out, fmt.Errorf("%w\ncommand: %s\ndir: %s\noutput:\n%s", err, cmd.String(), cmd.Dir, formatOutput(out))
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}
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return out, nil
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}
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func formatOutput(out []byte) string {
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if len(out) == 0 {
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return "(no output)"
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}
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if len(out) <= maxCapturedOutputBytes {
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return strings.TrimRight(string(out), "\n")
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}
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trimmed := out[len(out)-maxCapturedOutputBytes:]
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return fmt.Sprintf("... (truncated; showing last %d bytes)\n%s", maxCapturedOutputBytes, strings.TrimRight(string(trimmed), "\n"))
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}
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