By default, notmuch won't try to decrypt on indexing.  With this
patch, we make it possible to indicate a per-database preference using
the config variable "index.try_decrypt", which by default will be
false.

At indexing time, the database needs some way to know its internal
defaults for how to index encrypted parts.  It shouldn't be contingent
on an external config file (since that can't be retrieved from the
database object itself), so we store it in the database.

This behaves similarly to the query.* configurations, which are also
stored in the database itself, so we're not introducing any new
dependencies by requiring that it be stored in the database.
---
 doc/man1/notmuch-config.rst     | 13 +++++++++++++
 doc/man7/notmuch-properties.rst |  6 ++++--
 lib/indexopts.c                 | 18 +++++++++++++++++-
 notmuch-config.c                |  6 ++++++
 4 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/doc/man1/notmuch-config.rst b/doc/man1/notmuch-config.rst
index 539199c2..6961737f 100644
--- a/doc/man1/notmuch-config.rst
+++ b/doc/man1/notmuch-config.rst
@@ -138,6 +138,19 @@ The available configuration items are described below.
 
         Default: ``gpg``.
 
+    **index.try_decrypt**
+
+        **[STORED IN DATABASE]**
+        When indexing an encrypted e-mail message, if this variable is
+        set to true, notmuch will try to decrypt the message and index
+        the cleartext.  Be aware that the index is likely sufficient
+        to reconstruct the cleartext of the message itself, so please
+        ensure that the notmuch message index is adequately protected.
+        DO NOT USE ``index.try_decrypt=true`` without considering the
+        security of your index.
+
+        Default: ``false``.
+
     **built_with.<name>**
 
         Compile time feature <name>. Current possibilities include
diff --git a/doc/man7/notmuch-properties.rst b/doc/man7/notmuch-properties.rst
index 4b47e8d7..68121359 100644
--- a/doc/man7/notmuch-properties.rst
+++ b/doc/man7/notmuch-properties.rst
@@ -70,13 +70,15 @@ of its normal activity.
     properties will be set on the message as a whole.
 
     If notmuch never tried to decrypt an encrypted message during
-    indexing (which is the default), then this property will not be
-    set on that message.
+    indexing (which is the default, see ``index.try_decrypt`` in
+    **notmuch-config(1)**), then this property will not be set on that
+    message.
 
 SEE ALSO
 ========
 
 **notmuch(1)**,
+**notmuch-config(1)**,
 **notmuch-dump(1)**,
 **notmuch-insert(1)**,
 **notmuch-new(1)**,
diff --git a/lib/indexopts.c b/lib/indexopts.c
index 51b56dd7..15c31d24 100644
--- a/lib/indexopts.c
+++ b/lib/indexopts.c
@@ -23,7 +23,23 @@
 notmuch_indexopts_t *
 notmuch_database_get_default_indexopts (notmuch_database_t *db)
 {
-    return talloc_zero (db, notmuch_indexopts_t);
+    notmuch_indexopts_t *ret = talloc_zero (db, notmuch_indexopts_t);
+    if (!ret)
+	return ret;
+
+    char * try_decrypt;
+    notmuch_status_t err = notmuch_database_get_config (db, "index.try_decrypt", &try_decrypt);
+    if (err)
+	return ret;
+
+    if (try_decrypt &&
+	((!(strcasecmp(try_decrypt, "true"))) ||
+	 (!(strcasecmp(try_decrypt, "yes"))) ||
+	 (!(strcasecmp(try_decrypt, "1")))))
+	notmuch_indexopts_set_try_decrypt (ret, true);
+
+    free (try_decrypt);
+    return ret;
 }
 
 notmuch_status_t
diff --git a/notmuch-config.c b/notmuch-config.c
index 74668718..1cba2661 100644
--- a/notmuch-config.c
+++ b/notmuch-config.c
@@ -812,8 +812,14 @@ _item_split (char *item, char **group, char **key)
 static bool
 _stored_in_db (const char *item)
 {
+    const char * db_configs[] = {
+	"index.try_decrypt",
+    };
     if (STRNCMP_LITERAL (item, "query.") == 0)
 	return true;
+    for (size_t i = 0; i < ARRAY_SIZE (db_configs); i++)
+	if (strcmp (item, db_configs[i]) == 0)
+	    return true;
     return false;
 }
 
-- 
2.14.2

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