[gvfs/wip/oholy/test-pipe-capacity: 7/7] tests: Increase size for pipes to avoid hangs

[Ondrej Holy <oholy src gnome org>]

commit 47fd82a50b157a2ac3919bbc9655dd65ff7d8436
Author: Ondrej Holy <oholy redhat com>
Date:   Thu Feb 6 15:59:49 2020 +0100

    tests: Increase size for pipes to avoid hangs
    
    glib-networking started printing big amount of debug info which cause
    test suite hangs. It is because the stdout/stderr is redirected to pipes,
    which have limited capacity. Let's increase the pipe capacity to its
    maximum to fix this issue.
    
    Fixes: https://gitlab.gnome.org/GNOME/gvfs/issues/451

 test/gvfs-test | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/test/gvfs-test b/test/gvfs-test
index 2c37deeb..4361f798 100755
--- a/test/gvfs-test
+++ b/test/gvfs-test
@@ -1838,6 +1838,12 @@ def start_dbus():
     flags = fcntl.fcntl(dbus_daemon.stderr, fcntl.F_GETFL)
     fcntl.fcntl(dbus_daemon.stderr, fcntl.F_SETFL, flags | os.O_NONBLOCK)
 
+    # set maximal size for pipes to avoid hangs when too many debug info is printed
+    F_SETPIPE_SZ = 1031
+    pipe_max_size = int(open('/proc/sys/fs/pipe-max-size', 'r').read())
+    fcntl.fcntl(dbus_daemon.stdout, F_SETPIPE_SZ, pipe_max_size)
+    fcntl.fcntl(dbus_daemon.stderr, F_SETPIPE_SZ, pipe_max_size)
+
     return temp_home