CLI: add talloc leak report, controlled by an environment variable.

The argument handling in notmuch.c seems due for an overhaul, but
until then use an environment variable to specify a location to write
the talloc leak report to.  This is only enabled for the (interesting)
case where some notmuch subcommand is invoked.

diff --git a/notmuch.c b/notmuch.c
index 9516dfb7b59850a9cdfdb3708c90df7ff3830d5e..4fc0973d3715ddd6a967d0c16f8f188b7f951c51 100644 (file)
--- a/notmuch.c
+++ b/notmuch.c
@@ -322,8 +322,28 @@ main (int argc, char *argv[])
     for (i = 0; i < ARRAY_SIZE (commands); i++) {
        command = &commands[i];
 
-       if (strcmp (argv[1], command->name) == 0)
-           return (command->function) (local, argc - 1, &argv[1]);
+       if (strcmp (argv[1], command->name) == 0) {
+           int ret;
+           char *talloc_report;
+
+           ret = (command->function)(local, argc - 1, &argv[1]);
+
+           /* in the future support for this environment variable may
+            * be supplemented or replaced by command line arguments
+            * --leak-report and/or --leak-report-full */
+
+           talloc_report = getenv ("NOTMUCH_TALLOC_REPORT");
+
+           /* this relies on the previous call to
+            * talloc_enable_null_tracking */
+
+           if (talloc_report && strcmp (talloc_report, "") != 0) {
+               FILE *report = fopen (talloc_report, "w");
+               talloc_report_full (NULL, report);
+           }
+
+           return ret;
+       }
     }
 
     fprintf (stderr, "Error: Unknown command '%s' (see \"notmuch help\")\n",