[PATCH 23/28] CLI+lib: detect missing database in split configurations.

[David Bremner <david@tethera.net>]

Eventually we want to do all opening of databases in the top
level (main function). This means that detection of missing databases
needs to move out of subcommands. It also requires updating the
library to use the new NO_DATABASE status code.
---
 lib/open.cc              | 24 +++++++++++++-------
 notmuch.c                | 47 +++++++++++++++++-----------------------
 test/T040-setup.sh       |  7 ++----
 test/T055-path-config.sh | 16 ++++++++++++++
 4 files changed, 54 insertions(+), 40 deletions(-)

diff --git a/lib/open.cc b/lib/open.cc
index d0493950..387e4ddb 100644
--- a/lib/open.cc
+++ b/lib/open.cc
@@ -209,8 +209,8 @@ _choose_database_path (void *ctx,
     }
 
     if (*database_path == NULL) {
-	*message = strdup ("Error: Cannot open a database for a NULL path.\n");
-	return NOTMUCH_STATUS_NULL_POINTER;
+	*message = strdup ("Error: could not locate database.\n");
+	return NOTMUCH_STATUS_NO_DATABASE;
     }
 
     if (*database_path[0] != '/') {
@@ -750,12 +750,12 @@ _maybe_load_config_from_database (notmuch_database_t *notmuch,
     char *message; /* ignored */
 
     if (_db_dir_exists (database_path, &message))
-	return NOTMUCH_STATUS_SUCCESS;
+	return NOTMUCH_STATUS_NO_DATABASE;
 
     _set_database_path (notmuch, database_path);
 
     if (_notmuch_choose_xapian_path (notmuch, database_path, &notmuch->xapian_path, &message))
-	return NOTMUCH_STATUS_SUCCESS;
+	return NOTMUCH_STATUS_NO_DATABASE;
 
     (void) _finish_open (notmuch, profile, NOTMUCH_DATABASE_MODE_READ_ONLY, key_file, &message);
 
@@ -798,19 +798,27 @@ notmuch_database_load_config (const char *database_path,
     status = _choose_database_path (local, profile, key_file,
 				    &database_path, &split, &message);
     switch (status) {
-    /* weirdly NULL_POINTER is what is returned if we fail to find
-     * a database */
-    case NOTMUCH_STATUS_NULL_POINTER:
+    case NOTMUCH_STATUS_NO_DATABASE:
     case NOTMUCH_STATUS_SUCCESS:
+	if (! warning)
+	    warning = status;
 	break;
     default:
 	goto DONE;
     }
 
+
     if (database_path) {
 	status = _maybe_load_config_from_database (notmuch, key_file, database_path, profile);
-	if (status)
+	switch (status) {
+	case NOTMUCH_STATUS_NO_DATABASE:
+	case NOTMUCH_STATUS_SUCCESS:
+	    if (! warning)
+		warning = status;
+	    break;
+	default:
 	    goto DONE;
+	}
     }
 
     if (key_file) {
diff --git a/notmuch.c b/notmuch.c
index ff9ad18b..bcb4b768 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -380,34 +380,12 @@ notmuch_command (notmuch_config_t *config,
 		 notmuch_database_t *notmuch,
 		 unused(int argc), unused(char **argv))
 {
-    char *db_path;
-    struct stat st;
-
     /* If the user has never configured notmuch, then run
      * notmuch_setup_command which will give a nice welcome message,
      * and interactively guide the user through the configuration. */
     if (notmuch_config_is_new (config))
 	return notmuch_setup_command (config, notmuch, 0, NULL);
 
-    /* Notmuch is already configured, but is there a database? */
-    db_path = talloc_asprintf (config, "%s/%s",
-			       notmuch_config_get (notmuch, NOTMUCH_CONFIG_DATABASE_PATH),
-			       ".notmuch");
-    if (stat (db_path, &st)) {
-	if (errno != ENOENT) {
-	    fprintf (stderr, "Error looking for notmuch database at %s: %s\n",
-		     db_path, strerror (errno));
-	    return EXIT_FAILURE;
-	}
-	printf ("Notmuch is configured, but there's not yet a database at\n\n\t%s\n\n",
-		db_path);
-	printf ("You probably want to run \"notmuch new\" now to create that database.\n\n"
-		"Note that the first run of \"notmuch new\" can take a very long time\n"
-		"and that the resulting database will use roughly the same amount of\n"
-		"storage space as the email being indexed.\n\n");
-	return EXIT_SUCCESS;
-    }
-
     printf ("Notmuch is configured and appears to have a database. Excellent!\n\n"
 	    "At this point you can start exploring the functionality of notmuch by\n"
 	    "using commands such as:\n\n"
@@ -576,12 +554,27 @@ main (int argc, char *argv[])
 	    fputs ("Try running 'notmuch setup' to create a configuration.", stderr);
 	    goto DONE;
 	}
-
-	if (status && (status != NOTMUCH_STATUS_NO_CONFIG)) {
-	    if (status_string) {
-		fputs (status_string, stderr);
-		free (status_string);
+	switch (status) {
+	case NOTMUCH_STATUS_NO_CONFIG:
+	    if (! (command->mode & NOTMUCH_COMMAND_CONFIG_CREATE)) {
+		fputs ("Try running 'notmuch setup' to create a configuration.", stderr);
+		goto DONE;
+	    }
+	    break;
+	case NOTMUCH_STATUS_NO_DATABASE:
+	    if (! command_name) {
+		printf ("Notmuch is configured, but no database was found.\n");
+		printf ("You probably want to run \"notmuch new\" now to create a database.\n\n"
+			"Note that the first run of \"notmuch new\" can take a very long time\n"
+			"and that the resulting database will use roughly the same amount of\n"
+			"storage space as the email being indexed.\n\n");
+		status = NOTMUCH_STATUS_SUCCESS;
+		goto DONE;
 	    }
+	    break;
+	case NOTMUCH_STATUS_SUCCESS:
+	    break;
+	default:
 	    goto DONE;
 	}
 
diff --git a/test/T040-setup.sh b/test/T040-setup.sh
index daeca3e4..42c621c8 100755
--- a/test/T040-setup.sh
+++ b/test/T040-setup.sh
@@ -26,11 +26,8 @@ test_expect_equal_file ${expected_dir}/config-with-comments new-notmuch-config
 test_begin_subtest "notmuch with a config but without a database suggests notmuch new"
 notmuch 2>&1 | notmuch_dir_sanitize > OUTPUT
 cat <<EOF > EXPECTED
-Notmuch is configured, but there's not yet a database at
-
-	MAIL_DIR/.notmuch
-
-You probably want to run "notmuch new" now to create that database.
+Notmuch is configured, but no database was found.
+You probably want to run "notmuch new" now to create a database.
 
 Note that the first run of "notmuch new" can take a very long time
 and that the resulting database will use roughly the same amount of
diff --git a/test/T055-path-config.sh b/test/T055-path-config.sh
index d8828342..0a34e67f 100755
--- a/test/T055-path-config.sh
+++ b/test/T055-path-config.sh
@@ -199,6 +199,22 @@ EOF
 	"$output" \
 	"Welcome to a new version of notmuch! Your database will now be upgraded."
 
+    test_begin_subtest "notmuch +config -database suggests notmuch new ($config)"
+    mv "$XAPIAN_PATH" "${XAPIAN_PATH}.bak"
+    notmuch > OUTPUT
+cat <<EOF > EXPECTED
+Notmuch is configured, but no database was found.
+You probably want to run "notmuch new" now to create a database.
+
+Note that the first run of "notmuch new" can take a very long time
+and that the resulting database will use roughly the same amount of
+storage space as the email being indexed.
+
+EOF
+    mv "${XAPIAN_PATH}.bak" "$XAPIAN_PATH"
+
+   test_expect_equal_file EXPECTED OUTPUT
+
     restore_config
 done
 
-- 
2.30.2