Raise a nicer error when we cannot execute the editor (#44423)

* Raise a nicer error when we cannot execute the editor. Fixes #44419

* Don't use to_bytes when constructing an exception

* Add changelog fragment

changelogs/fragments/vault-errors.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- vault - fix error message encoding, and ensure we present a friendlier error when the EDITOR is missing (https://github.com/ansible/ansible/pull/44423)

lib/ansible/parsing/vault/__init__.py

@@ -853,16 +853,17 @@ class VaultEditor:
         fd, tmp_path = tempfile.mkstemp(suffix=ext)
         os.close(fd)
 
+        cmd = self._editor_shell_command(tmp_path)
         try:
             if existing_data:
                 self.write_data(existing_data, tmp_path, shred=False)
 
             # drop the user into an editor on the tmp file
-            subprocess.call(self._editor_shell_command(tmp_path))
-        except:
+            subprocess.call(cmd)
+        except Exception as e:
             # whatever happens, destroy the decrypted file
             self._shred_file(tmp_path)
-            raise
+            raise AnsibleError('Unable to execute the command "%s": %s' % (' '.join(cmd), to_native(e)))
 
         b_tmpdata = self.read_data(tmp_path)
 
@@ -917,7 +918,7 @@ class VaultEditor:
         try:
             plaintext = self.vault.decrypt(ciphertext, filename=filename)
         except AnsibleError as e:
-            raise AnsibleError("%s for %s" % (to_bytes(e), to_bytes(filename)))
+            raise AnsibleError("%s for %s" % (to_native(e), to_native(filename)))
         self.write_data(plaintext, output_file or filename, shred=False)
 
     def create_file(self, filename, secret, vault_id=None):
@@ -951,7 +952,7 @@ class VaultEditor:
             # TODO: return the vault_id that worked?
             plaintext, vault_id_used, vault_secret_used = self.vault.decrypt_and_get_vault_id(vaulttext)
         except AnsibleError as e:
-            raise AnsibleError("%s for %s" % (to_bytes(e), to_bytes(filename)))
+            raise AnsibleError("%s for %s" % (to_native(e), to_native(filename)))
 
         # Figure out the vault id from the file, to select the right secret to re-encrypt it
         # (duplicates parts of decrypt, but alas...)
@@ -980,7 +981,7 @@ class VaultEditor:
             plaintext = self.vault.decrypt(vaulttext, filename=filename)
             return plaintext
         except AnsibleError as e:
-            raise AnsibleVaultError("%s for %s" % (to_bytes(e), to_bytes(filename)))
+            raise AnsibleVaultError("%s for %s" % (to_native(e), to_native(filename)))
 
     # FIXME/TODO: make this use VaultSecret
     def rekey_file(self, filename, new_vault_secret, new_vault_id=None):
@@ -997,7 +998,7 @@ class VaultEditor:
         try:
             plaintext, vault_id_used, _dummy = self.vault.decrypt_and_get_vault_id(vaulttext)
         except AnsibleError as e:
-            raise AnsibleError("%s for %s" % (to_bytes(e), to_bytes(filename)))
+            raise AnsibleError("%s for %s" % (to_native(e), to_native(filename)))
 
         # This is more or less an assert, see #18247
         if new_vault_secret is None: