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package propagation
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
)
// findExecutable finds the given executable name and returns an absolute path.
// The lookup order is:
// 1. If 'name' is an absolute path, it is used directly.
// 2. If 'name' contains a path separator, it's treated as a relative path to the current working directory.
// 3. If 'name' does not contain a separator, it is looked up in PATH (using exec.LookPath).
func findExecutable(name string) (string, error) {
name = os.ExpandEnv(name)
// 1. If 'name' is an absolute path, check if it exists and return it.
if filepath.IsAbs(name) {
if _, err := os.Stat(name); err != nil {
return "", err
}
return name, nil
}
// 2. If 'name' contains a path separator, treat as a relative path.
if strings.ContainsRune(name, os.PathSeparator) {
absPath, err := filepath.Abs(name)
if err != nil {
return "", fmt.Errorf("failed to get absolute path for '%s': %w", name, err)
}
if _, err := os.Stat(absPath); err != nil {
return "", err
}
return absPath, nil
}
// 3. Try to find the command in PATH.
return exec.LookPath(name) // LookPath returns an absolute path or an error
}
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