Stop vault safety checks from reading unreadable state as empty (closes #51)

Adding a PGP unlocker checked unlockers.d for a duplicate and, when the
directory or an unlocker's metadata file could not be read, reported no
duplicate and went on. The check now reads unlockers.d itself and stops
with an error naming the path and cause; `unlocker list` keeps skipping
unlockers it cannot read.

The same flaw guarded removing the last unlocker and removing a vault
(an unreadable secrets directory counted as no secrets) and vault
import (an unreadable pub.age counted as no long-term key). Those now
stop with an error too.

`vault rm` and `unlocker rm` now take the state directory lock and call
an unexported function that does the work, as `vault import` does.

Model: opus-5-5

internal/cli/vault.go

@@ -401,8 +401,12 @@ func (cli *Instance) vaultImportPreflight(
 	// Check if vault already has a public key
 	pubKeyPath := vaultDir + "/pub.age"
 
-	_, err = cli.fs.Stat(pubKeyPath)
-	if err == nil {
+	exists, err = afero.Exists(cli.fs, pubKeyPath)
+	if err != nil {
+		return "", "", "", fmt.Errorf("failed to check %s: %w", pubKeyPath, err)
+	}
+
+	if exists {
 		return "", "", "", fmt.Errorf("vault '%s' %w",
 			vaultName, errVaultHasLongTermKey)
 	}
@@ -562,17 +566,26 @@ func (cli *Instance) importMnemonic(cmd *cobra.Command, vaultName string) error
 }
 
 // vaultHasSecrets reports whether the vault directory contains any secrets
-func (cli *Instance) vaultHasSecrets(vaultDir string) bool {
+func (cli *Instance) vaultHasSecrets(vaultDir string) (bool, error) {
 	secretsDir := filepath.Join(vaultDir, "secrets.d")
 
-	exists, _ := afero.DirExists(cli.fs, secretsDir)
+	exists, err := afero.DirExists(cli.fs, secretsDir)
+	if err != nil {
+		return false, fmt.Errorf("failed to check secrets directory %s: %w",
+			secretsDir, err)
+	}
+
 	if !exists {
-		return false
+		return false, nil
 	}
 
 	entries, err := afero.ReadDir(cli.fs, secretsDir)
+	if err != nil {
+		return false, fmt.Errorf("failed to read secrets directory %s: %w",
+			secretsDir, err)
+	}
 
-	return err == nil && len(entries) > 0
+	return len(entries) > 0, nil
 }
 
 // switchAwayFromVault selects another vault as current before removal
@@ -601,7 +614,8 @@ func (cli *Instance) switchAwayFromVault(
 	return nil
 }
 
-// RemoveVault removes a vault with safety checks
+// RemoveVault removes a vault, holding the state directory lock while
+// removeVault runs
 func (cli *Instance) RemoveVault(cmd *cobra.Command, name string, force bool) error {
 	release, err := vault.LockStateDir(cli.fs, cli.stateDir)
 	if err != nil {
@@ -609,6 +623,11 @@ func (cli *Instance) RemoveVault(cmd *cobra.Command, name string, force bool) er
 	}
 	defer release()
 
+	return cli.removeVault(cmd, name, force)
+}
+
+// removeVault removes a vault with safety checks
+func (cli *Instance) removeVault(cmd *cobra.Command, name string, force bool) error {
 	// Get list of all vaults
 	vaults, err := vault.ListVaults(cli.fs, cli.stateDir)
 	if err != nil {
@@ -642,7 +661,10 @@ func (cli *Instance) RemoveVault(cmd *cobra.Command, name string, force bool) er
 	}
 
 	// Check if vault has secrets
-	hasSecrets := cli.vaultHasSecrets(vaultDir)
+	hasSecrets, err := cli.vaultHasSecrets(vaultDir)
+	if err != nil {
+		return err
+	}
 
 	// Require --force if vault has secrets
 	if hasSecrets && !force {