48 lines
866 B
Go
48 lines
866 B
Go
package main
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import (
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"errors"
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"fmt"
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"io/fs"
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"os"
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"slices"
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"strings"
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)
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func envOr(name string, fallback func() string) string {
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if v := os.Getenv(name); v != "" {
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return v
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}
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return fallback()
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}
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func firstExistingDir(paths ...string) (string, error) {
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var errs []error
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for _, path := range paths {
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stat, err := os.Stat(path)
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switch {
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case errors.Is(err, fs.ErrExist):
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continue
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case err != nil:
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errs = append(
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errs, fmt.Errorf("checking if path %q exists: %w", path, err),
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)
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case !stat.IsDir():
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errs = append(
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errs, fmt.Errorf("path %q exists but is not a directory", path),
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)
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default:
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return path, nil
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}
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}
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err := fmt.Errorf(
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"no directory found at any of the following paths: %s",
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strings.Join(paths, ", "),
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)
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if len(errs) > 0 {
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err = errors.Join(slices.Insert(errs, 0, err)...)
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}
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return "", err
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}
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