Worker: check BLENDER_CMD environment variable (for multi-GPU Eevee rendering) #104193

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MKRelax wants to merge 9 commits from MKRelax/flamenco:worker-use-blender-from-env into main

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@ -6,6 +6,7 @@ package worker
import (
"context"
"fmt"
"os/exec"
"regexp"
"sync"
@ -88,7 +89,8 @@ func (ce *CommandExecutor) cmdBlenderRenderCommand(
// No directory path given. Check that the executable is set in an
// environment variable or can be found on the path.
if path := find_blender.EnvironmentVariable(); path != "" {
logger.Info().Str("path", path).Msg("found Blender in environment")
msg := fmt.Sprintf("using blender from %s", find_blender.BlenderPathEnvVariable)
logger.Info().Str("path", path).Msg(msg)

I wouldn't say "found Blender" here, because the path wasn't checked. Blender may not even exist there.

Maybe find_blender.EnvironmentVariable() can return two strings, (name, path) where name is the name of the environment variable, and path is the actual value. That way you can log here "using Blender from {environment variable name}".

I wouldn't say "found Blender" here, because the path wasn't checked. Blender may not even exist there. Maybe `find_blender.EnvironmentVariable()` can return two strings, `(name, path)` where `name` is the name of the environment variable, and `path` is the actual value. That way you can log here "using Blender from {environment variable name}".

I did change the log message to "using Blender from FLAMENCO_BLENDER_PATH".

However, since the name of the variable is (now) a constant I think there is no need to return it from find_blender.EnvironmentVariable(). Most code would not be interested in it anyway and probably ignore it using a _ variable. So the log message simply uses the constant.

I did change the log message to "using Blender from FLAMENCO_BLENDER_PATH". However, since the name of the variable is (now) a constant I think there is no need to return it from `find_blender.EnvironmentVariable()`. Most code would not be interested in it anyway and probably ignore it using a `_` variable. So the log message simply uses the constant.

I think it's still good to return the variable name. That way you get less coupling between the different parts of the code, making things more maintainable.

I think it's still good to return the variable name. That way you get less coupling between the different parts of the code, making things more maintainable.
parameters.exe = path
} else if _, err := exec.LookPath(parameters.exe); err != nil {
// Attempt a platform-specific way to find which Blender executable to