ansible-vault encrypt_string: fix --output to write into file (#76856)

Fixes #75101
Fixes #59590

changelogs/fragments/75101-ansible-vault-encrypt_string-output-file.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "ansible-vault encrypt_string - fix ``--output`` option to correctly write encrypted string into given file (https://github.com/ansible/ansible/issues/75101)"

lib/ansible/cli/vault.py

@@ -376,12 +376,15 @@ class VaultCLI(CLI):
         # Format the encrypted strings and any corresponding stderr output
         outputs = self._format_output_vault_strings(b_plaintext_list, vault_id=self.encrypt_vault_id)
 
+        b_outs = []
         for output in outputs:
             err = output.get('err', None)
             out = output.get('out', '')
             if err:
                 sys.stderr.write(err)
-            print(out)
+            b_outs.append(to_bytes(out))
+
+        self.editor.write_data(b'\n'.join(b_outs), context.CLIARGS['output_file'] or '-')
 
         if sys.stdout.isatty():
             display.display("Encryption successful", stderr=True)

test/integration/targets/ansible-vault/runme.sh

@@ -344,6 +344,8 @@ ansible-vault encrypt_string "$@" --vault-password-file "${NEW_VAULT_PASSWORD}"
 # write to file
 ansible-vault encrypt_string "$@" --vault-password-file "${NEW_VAULT_PASSWORD}" --name "blippy" "a test string names blippy" --output "${MYTMPDIR}/enc_string_test_file"
 
+[ -f "${MYTMPDIR}/enc_string_test_file" ];
+
 # test ansible-vault edit with a faux editor
 ansible-vault encrypt "$@" --vault-password-file vault-password "${TEST_FILE_EDIT}"