[PATCH v2 2/3] block: deprecate iSCSI 'password' in favour of 'password-secret'

["Daniel P. Berrangé" <berrange@redhat.com>]

Support for referencing secret objects was added in

  commit b189346eb1784df95ed6fed610411dbf23d19e1f
  Author: Daniel P. Berrangé <berrange@redhat.com>
  Date:   Thu Jan 21 14:19:21 2016 +0000

    iscsi: add support for getting CHAP password via QCryptoSecret API

The existing 'password' option is overdue for deprecation and
subsequent removal.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 block/iscsi.c             | 3 +++
 docs/about/deprecated.rst | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/block/iscsi.c b/block/iscsi.c
index a316d46d96..58c0623052 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1352,6 +1352,9 @@ static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
     } else if (!password) {
         error_setg(errp, "CHAP username specified but no password was given");
         return;
+    } else {
+        warn_report("iSCSI block driver 'password' option is deprecated, "
+                    "use 'password-secret' instead");
     }
 
     if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 93affe3669..daf2334040 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -333,6 +333,14 @@ The above, converted to the current supported format::
 
   json:{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"}
 
+``iscsi,password=xxx`` (since 8.0)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Specifying the iSCSI password in plain text on the command line using the
+``password`` option is insecure. The ``password-secret`` option should be
+used instead, to refer to a ``--object secret...`` instance that provides
+a password via a file, or encrypted.
+
 Backwards compatibility
 -----------------------
 
-- 
2.38.1