[agent] set dry-run option in Thread config if printRadioVersion is true (#1028)

`otbr-agent` will exit directly if `--radio-version` is passed in
parameters. This PR sets the DryRun option in PosixConfig when
`radio-version` is set. In this way, the posix instance will only
initialize very few things to avoid permission issues.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/agent/main.cpp b/src/agent/main.cpp
index 61a59319..5ec22df9 100644
--- a/src/agent/main.cpp
+++ b/src/agent/main.cpp
@@ -285,7 +285,8 @@ static int realmain(int argc, char *argv[])
     }
 
     {
-        otbr::Ncp::ControllerOpenThread ncpOpenThread{interfaceName, radioUrls, backboneInterfaceName};
+        otbr::Ncp::ControllerOpenThread ncpOpenThread{interfaceName, radioUrls, backboneInterfaceName,
+                                                      /* aDryRun */ printRadioVersion};
 
         otbr::InstanceParams::Get().SetThreadIfName(interfaceName);
         otbr::InstanceParams::Get().SetBackboneIfName(backboneInterfaceName);