Better error message when s6-sudoc gets punted by s6-ipcserver-access

1 files changed, 6 insertions, 2 deletions

diff --git a/src/conn-tools/s6-sudoc.c b/src/conn-tools/s6-sudoc.c
index eb8f138..18851e0 100644
--- a/src/conn-tools/s6-sudoc.c
+++ b/src/conn-tools/s6-sudoc.c
@@ -56,11 +56,15 @@ int main (int argc, char const *const *argv, char const *const *envp)
   tain_now_g() ;
   tain_add_g(&deadline, &deadline) ;
   {
+    size_t r ;
     char tmp[S6_SUDO_BANNERB_LEN] ;
-    if (buffer_timed_get_g(&b6, tmp, S6_SUDO_BANNERB_LEN, &deadline) < S6_SUDO_BANNERB_LEN)
+    r = buffer_timed_get_g(&b6, tmp, S6_SUDO_BANNERB_LEN, &deadline) ;
+    if (!r)
+      strerr_dief1x(111, "connect to the s6-sudod server - check that you have appropriate permissions") ;
+    if (r < S6_SUDO_BANNERB_LEN)
       strerr_diefu1sys(111, "read banner from s6-sudod") ;
     if (strncmp(tmp, S6_SUDO_BANNERB, S6_SUDO_BANNERB_LEN))
-      strerr_dief1x(100, "wrong server banner") ;
+      strerr_dief1x(100, "wrong banner - check that you are connecting to a s6-sudod server") ;
   }
   {
     int fds[3] = { 0, 1, 2 } ;