62 lines
1.9 KiB
Go
62 lines
1.9 KiB
Go
package infra
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// ResolveRegistryRoot returns the absolute path of the fn_registry root
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// (the directory that contains registry.db), or an error if not found.
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//
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// Resolution order:
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// 1. FN_REGISTRY_ROOT env var — if set and <dir>/registry.db exists, return it.
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// 2. Walk up from the executable's directory — up to 6 levels; first dir
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// that contains registry.db wins. Covers binaries at <root>/fn and at
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// <root>/apps/<x>/<bin>.
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// 3. $HOME/fn_registry — if <$HOME>/fn_registry/registry.db exists.
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// 4. Error — no method found a valid registry root.
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func ResolveRegistryRoot() (string, error) {
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// 1. Env var
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if envDir := os.Getenv("FN_REGISTRY_ROOT"); envDir != "" {
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if nonEmptyFile(filepath.Join(envDir, "registry.db")) {
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return filepath.Clean(envDir), nil
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}
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}
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// 2. Walk up from executable
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if exe, err := os.Executable(); err == nil {
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dir := filepath.Dir(exe)
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for i := 0; i < 6; i++ {
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if nonEmptyFile(filepath.Join(dir, "registry.db")) {
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return dir, nil
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}
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parent := filepath.Dir(dir)
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if parent == dir {
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// Reached filesystem root
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break
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}
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dir = parent
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}
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}
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// 3. $HOME/fn_registry
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if home, err := os.UserHomeDir(); err == nil {
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candidate := filepath.Join(home, "fn_registry")
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if nonEmptyFile(filepath.Join(candidate, "registry.db")) {
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return candidate, nil
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}
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}
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return "", fmt.Errorf("resolve_registry_root: no se encontro registry.db (set FN_REGISTRY_ROOT)")
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}
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// nonEmptyFile reports whether path is an existing, non-empty regular file.
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// A zero-byte registry.db — which sql.Open silently creates when handed a
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// mis-resolved path — must NOT count as a valid registry root, otherwise such
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// a shadow file would hijack the walk-up and mask the real database.
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func nonEmptyFile(path string) bool {
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fi, err := os.Stat(path)
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return err == nil && fi.Mode().IsRegular() && fi.Size() > 0
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}
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