Maksim Totmin
4c34f0bedc
Streams H.264 to the Galahad II LCD via USB (gousb) with: - ffmpeg CLI transcoding (no fragile FFmpeg C-ABI bindings) - pure-Go Annex-B access-unit splitting - framerate pacing with graceful shutdown and USB reconnect - TOML config, cobra CLI, structured slog logging, unit tests
35 lines
932 B
Go
35 lines
932 B
Go
// Package service manages the galahad2lcd systemd unit.
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package service
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import (
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"context"
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"fmt"
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"os/exec"
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)
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// Service represents the installed systemd unit.
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type Service struct {
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name string
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// runCmd is the command constructor; overridable for tests.
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runCmd func(ctx context.Context, name string, arg ...string) *exec.Cmd
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}
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// New returns a Service wrapper for the given unit name.
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func New(name string) *Service {
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return &Service{name: name, runCmd: exec.CommandContext}
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}
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// Restart tells systemd to restart the service. It fails early when the
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// caller lacks privileges.
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func (s *Service) Restart(ctx context.Context) error {
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cmd := s.runCmd(ctx, "systemctl", "restart", s.name)
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out, err := cmd.CombinedOutput()
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if err != nil {
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if len(out) > 0 {
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return fmt.Errorf("systemctl restart %s: %w (%s)", s.name, err, string(out))
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}
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return fmt.Errorf("systemctl restart %s: %w", s.name, err)
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}
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return nil
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}
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