cli: config: fix config file save when the file does not exist

The use of realpath(3) in
commit 58ed67992d0ec1fa505026105218fa449f7980b0
Author: Jani Nikula <jani@nikula.org>
Date:   Sun Apr 7 20:15:03 2013 +0300

    cli: config: do not overwrite symlinks when saving config file

broke config file save when the file does not exist, which results in
'notmuch setup' always failing to create a new config file.

Fix by checking ENOENT from realpath(3).

1 files changed, 13 insertions, 4 deletions

diff --git a/notmuch-config.c b/notmuch-config.c
index d9c2eb3f..befe9b5b 100644
--- a/notmuch-config.c
+++ b/notmuch-config.c
@@ -456,10 +456,19 @@ notmuch_config_save (notmuch_config_t *config)
     /* Try not to overwrite symlinks. */
     filename = realpath (config->filename, NULL);
     if (! filename) {
-	fprintf (stderr, "Error canonicalizing %s: %s\n", config->filename,
-		 strerror (errno));
-	g_free (data);
-	return 1;
+	if (errno == ENOENT) {
+	    filename = strdup (config->filename);
+	    if (! filename) {
+		fprintf (stderr, "Out of memory.\n");
+		g_free (data);
+		return 1;
+	    }
+	} else {
+	    fprintf (stderr, "Error canonicalizing %s: %s\n", config->filename,
+		     strerror (errno));
+	    g_free (data);
+	    return 1;
+	}
     }
 
     if (! g_file_set_contents (filename, data, length, &error)) {