Cleanup: worker, move FFmpeg-finding at startup into its own file

Just a move of code from `main.go` to a dedicated file in the same package.

No functional changes

cmd/flamenco-worker/find_exes.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"errors"
+	"io/fs"
+
+	"github.com/rs/zerolog/log"
+
+	"git.blender.org/flamenco/internal/find_ffmpeg"
+)
+
+// findFFmpeg tries to find FFmpeg, in order to show its version (if found) or a warning (if not).
+func findFFmpeg() {
+	result, err := find_ffmpeg.Find()
+	switch {
+	case errors.Is(err, fs.ErrNotExist):
+		log.Warn().Msg("FFmpeg could not be found on this system, render jobs may not run correctly")
+	case err != nil:
+		log.Warn().Err(err).Msg("there was an unexpected error finding FFmepg on this system, render jobs may not run correctly")
+	default:
+		log.Info().Str("path", result.Path).Str("version", result.Version).Msg("FFmpeg found on this system")
+	}
+}

cmd/flamenco-worker/main.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"io/fs"
 	"net/url"
 	"os"
 	"os/signal"
@@ -21,7 +20,6 @@ import (
 	"github.com/rs/zerolog/log"
 
 	"git.blender.org/flamenco/internal/appinfo"
-	"git.blender.org/flamenco/internal/find_ffmpeg"
 	"git.blender.org/flamenco/internal/worker"
 	"git.blender.org/flamenco/internal/worker/cli_runner"
 )
@@ -259,16 +257,3 @@ func logFatalManagerDiscoveryError(err error, discoverTimeout time.Duration) {
 		log.Fatal().Err(err).Msg("auto-discovery error")
 	}
 }
-
-// findFFmpeg tries to find FFmpeg, in order to show its version (if found) or a warning (if not).
-func findFFmpeg() {
-	result, err := find_ffmpeg.Find()
-	switch {
-	case errors.Is(err, fs.ErrNotExist):
-		log.Warn().Msg("FFmpeg could not be found on this system, render jobs may not run correctly")
-	case err != nil:
-		log.Warn().Err(err).Msg("there was an unexpected error finding FFmepg on this system, render jobs may not run correctly")
-	default:
-		log.Info().Str("path", result.Path).Str("version", result.Version).Msg("FFmpeg found on this system")
-	}
-}

internal/find_blender/find_blender.go

@@ -35,6 +35,13 @@ type CheckBlenderResult struct {
 	Source         api.BlenderPathSource
 }
 
+// Find returns the path of a `blender` executable,
+// If there is one associated with .blend files, and the current platform is
+// supported to query those, that one is used. Otherwise $PATH is searched.
+func Find(ctx context.Context) (CheckBlenderResult, error) {
+	return CheckBlender(ctx, "")
+}
+
 // FileAssociation returns the full path of a Blender executable, by inspecting file association with .blend files.
 // `ErrNotAvailable` is returned if no "blender finder" is available for the current platform.
 func FileAssociation() (string, error) {