This lacks at least documentation. Note that it changes the default dump
output format, but doesn't break existing notmuch-restore. It might
break user scripts though.
---
 notmuch-client.h       |  6 ++++++
 notmuch-dump.c         | 41 ++++++++++++++++++++++++++++++++++++++---
 notmuch-new.c          |  2 +-
 test/T590-libconfig.sh | 10 ++++++++++
 4 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/notmuch-client.h b/notmuch-client.h
index 7c9a1ea..2dca83c 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -443,11 +443,17 @@ typedef enum dump_formats {
     DUMP_FORMAT_SUP
 } dump_format_t;
 
+typedef enum dump_includes {
+    DUMP_INCLUDE_TAGS=1,
+    DUMP_INCLUDE_CONFIG=2,
+} dump_include_t;
+
 int
 notmuch_database_dump (notmuch_database_t *notmuch,
                       const char *output_file_name,
                       const char *query_str,
                       dump_format_t output_format,
+                      dump_include_t include,
                       notmuch_bool_t gzip_output);
 
 /* If status is non-zero (i.e. error) print appropriate
diff --git a/notmuch-dump.c b/notmuch-dump.c
index 829781f..4909493 100644
--- a/notmuch-dump.c
+++ b/notmuch-dump.c
@@ -23,16 +23,43 @@
 #include "string-util.h"
 #include <zlib.h>
 
+static notmuch_status_t
+database_dump_config(notmuch_database_t *notmuch, gzFile output)
+{
+    notmuch_config_list_t *list;
+    notmuch_status_t status;
+    status = notmuch_database_get_config_list (notmuch, NULL, &list);
+    if (status)
+       return status;
+
+    for (; notmuch_config_list_valid (list); notmuch_config_list_move_to_next 
(list)) {
+       /* FIXME hexencode key and values */
+       gzprintf(output, "#@ %s %s\n",
+                notmuch_config_list_key (list), notmuch_config_list_value 
(list));
+    }
+    notmuch_config_list_destroy (list);
+
+    return NOTMUCH_STATUS_SUCCESS;
+}
 
 static int
 database_dump_file (notmuch_database_t *notmuch, gzFile output,
-                   const char *query_str, int output_format)
+                   const char *query_str, int output_format, int include)
 {
     notmuch_query_t *query;
     notmuch_messages_t *messages;
     notmuch_message_t *message;
     notmuch_tags_t *tags;
 
+    if (include | DUMP_INCLUDE_CONFIG) {
+       if (print_status_database ("notmuch dump", notmuch,
+                                  database_dump_config(notmuch,output)))
+           return EXIT_FAILURE;
+    }
+
+    if (! (include & DUMP_INCLUDE_TAGS))
+       return EXIT_SUCCESS;
+
     if (! query_str)
        query_str = "";
 
@@ -130,6 +157,7 @@ notmuch_database_dump (notmuch_database_t *notmuch,
                       const char *output_file_name,
                       const char *query_str,
                       dump_format_t output_format,
+                      dump_include_t include,
                       notmuch_bool_t gzip_output)
 {
     gzFile output = NULL;
@@ -164,7 +192,7 @@ notmuch_database_dump (notmuch_database_t *notmuch,
        goto DONE;
     }
 
-    ret = database_dump_file (notmuch, output, query_str, output_format);
+    ret = database_dump_file (notmuch, output, query_str, output_format, 
include);
     if (ret) goto DONE;
 
     ret = gzflush (output, Z_FINISH);
@@ -226,6 +254,7 @@ notmuch_dump_command (notmuch_config_t *config, int argc, 
char *argv[])
     int opt_index;
 
     int output_format = DUMP_FORMAT_BATCH_TAG;
+    int include = 0;
     notmuch_bool_t gzip_output = 0;
 
     notmuch_opt_desc_t options[] = {
@@ -233,6 +262,9 @@ notmuch_dump_command (notmuch_config_t *config, int argc, 
char *argv[])
          (notmuch_keyword_t []){ { "sup", DUMP_FORMAT_SUP },
                                  { "batch-tag", DUMP_FORMAT_BATCH_TAG },
                                  { 0, 0 } } },
+       { NOTMUCH_OPT_KEYWORD_FLAGS, &include, "include", 'i',
+         (notmuch_keyword_t []){ { "metadata", DUMP_INCLUDE_CONFIG },
+                                 { "tags", DUMP_INCLUDE_TAGS} } },
        { NOTMUCH_OPT_STRING, &output_file_name, "output", 'o', 0  },
        { NOTMUCH_OPT_BOOLEAN, &gzip_output, "gzip", 'z', 0 },
        { NOTMUCH_OPT_INHERIT, (void *) &notmuch_shared_options, NULL, 0, 0 },
@@ -245,6 +277,9 @@ notmuch_dump_command (notmuch_config_t *config, int argc, 
char *argv[])
 
     notmuch_process_shared_options (argv[0]);
 
+    if (include == 0)
+       include = DUMP_INCLUDE_CONFIG | DUMP_INCLUDE_TAGS;
+
     if (opt_index < argc) {
        query_str = query_string_from_args (notmuch, argc - opt_index, argv + 
opt_index);
        if (query_str == NULL) {
@@ -254,7 +289,7 @@ notmuch_dump_command (notmuch_config_t *config, int argc, 
char *argv[])
     }
 
     ret = notmuch_database_dump (notmuch, output_file_name, query_str,
-                                output_format, gzip_output);
+                                output_format, include, gzip_output);
 
     notmuch_database_destroy (notmuch);
 
diff --git a/notmuch-new.c b/notmuch-new.c
index e503776..fd2ff82 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -1041,7 +1041,7 @@ notmuch_new_command (notmuch_config_t *config, int argc, 
char *argv[])
            }
 
            if (notmuch_database_dump (notmuch, backup_name, "",
-                                      DUMP_FORMAT_BATCH_TAG, TRUE)) {
+                                      DUMP_FORMAT_BATCH_TAG, 
DUMP_INCLUDE_CONFIG | DUMP_INCLUDE_TAGS, TRUE)) {
                fprintf (stderr, "Backup failed. Aborting upgrade.");
                return EXIT_FAILURE;
            }
diff --git a/test/T590-libconfig.sh b/test/T590-libconfig.sh
index 8ca6883..4fe6bd1 100755
--- a/test/T590-libconfig.sh
+++ b/test/T590-libconfig.sh
@@ -115,4 +115,14 @@ testkey2 testvalue2
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "dump config"
+notmuch dump --include=metadata >OUTPUT
+cat <<'EOF' >EXPECTED
+#@ aaabefore beforeval
+#@ testkey1 testvalue1
+#@ testkey2 testvalue2
+#@ zzzafter afterval
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done
-- 
2.6.4

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