Allow to set the permissions of the Unix domain control socket

Several users in GitHub have asked for the ability to set the
permissions of the unitd UNIX Domain control socket.

This can of course be done externally, but can be done much cleaner by
Unit itself.

This commit adds three new options

  --control-mode	Set the mode of the socket, e.g 644

  --control-user	Set the user/owner of the socket, e.g unit

  --control-group	Set the group of the socket, e.g unit

Of course these only have an affect when using a UNIX Domain Socket for
the control socket.

Requested-by: michaelkosir <https://github.com/michaelkosir>
Requested-by: chopanovv <https://github.com/chopanovv>
Link: <https://github.com/nginx/unit/issues/254>
Link: <https://github.com/nginx/unit/issues/980>
Closes: https://github.com/nginx/unit/issues/840
Tested-by: Liam Crilly <liam.crilly@nginx.com>
Reviewed-by: Zhidao Hong <z.hong@f5.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/nxt_runtime.h b/src/nxt_runtime.h
index 66ec0106..7bd490d7 100644
--- a/src/nxt_runtime.h
+++ b/src/nxt_runtime.h
@@ -70,8 +70,12 @@ struct nxt_runtime_s {
     const char             *ver_tmp;
     const char             *conf;
     const char             *conf_tmp;
-    const char             *control;
     const char             *tmp;
+    const char             *control;
+
+    mode_t                 control_mode;
+    const char             *control_user;
+    const char             *control_group;
 
     nxt_str_t              certs;
     nxt_str_t              scripts;