57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Package compose executes Docker Compose through a fixed executable and argument arrays.
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package compose
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"os"
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"os/exec"
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)
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// Result is the captured output and process exit code for one Docker invocation.
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type Result struct {
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Stdout string
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Stderr string
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ExitCode int
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}
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// Runner executes the Docker CLI. It never invokes a shell.
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type Runner struct {
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binary string
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}
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// NewRunner returns a runner for binary. An empty binary selects docker from PATH.
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func NewRunner(binary string) Runner {
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if binary == "" {
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binary = "docker"
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}
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return Runner{binary: binary}
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}
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// Run invokes Docker with the supplied argument array and optional standard input.
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func (r Runner) Run(ctx context.Context, args []string, stdin io.Reader) (Result, error) {
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command := exec.CommandContext(ctx, r.binary, args...)
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command.Stdin = stdin
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var stdout, stderr bytes.Buffer
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command.Stdout = &stdout
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command.Stderr = &stderr
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err := command.Run()
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result := Result{Stdout: stdout.String(), Stderr: stderr.String()}
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if err == nil {
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return result, nil
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}
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var exitError *exec.ExitError
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if errors.As(err, &exitError) {
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result.ExitCode = exitError.ExitCode()
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return result, err
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}
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if errors.Is(err, exec.ErrNotFound) || errors.Is(err, os.ErrNotExist) {
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result.ExitCode = 127
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return result, fmt.Errorf("%w: %w", exec.ErrNotFound, err)
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}
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return result, err
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}
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