add user-agent to http request headers

src/rebar_pkg_resource.erl

@@ -104,7 +104,7 @@ make_vsn(_) ->
     {error, "Replacing version of type pkg not supported."}.
 
 request(Url, ETag) ->
-    case httpc:request(get, {Url, [{"if-none-match", ETag} || ETag =/= false]},
+    case httpc:request(get, {Url, [{"if-none-match", ETag} || ETag =/= false]++[{"User-Agent", rebar_utils:user_agent()}]},
                        [{ssl, ssl_opts(Url)}, {relaxed, true}],
                        [{body_format, binary}],
                        rebar) of

src/rebar_prv_update.erl

@@ -48,7 +48,7 @@ do(State) ->
                 case rebar_utils:url_append_path(CDN, ?REMOTE_REGISTRY_FILE) of
                     {ok, Url} ->
                         ?DEBUG("Fetching registry from ~p", [Url]),
-                        case httpc:request(get, {Url, []},
+                        case httpc:request(get, {Url, [{"User-Agent", rebar_utils:user_agent()}]},
                                            [], [{stream, TmpFile}, {sync, true}],
                                            rebar) of
                             {ok, saved_to_file} ->

src/rebar_utils.erl

@@ -68,7 +68,8 @@
          check_min_otp_version/1,
          check_blacklisted_otp_versions/1,
          info_useless/2,
-         list_dir/1]).
+         list_dir/1,
+         user_agent/0]).
 
 %% for internal use only
 -export([otp_release/0]).
@@ -407,6 +408,10 @@ abort_if_blacklisted(BlacklistedRegex, OtpRelease) ->
                    [OtpRelease, BlacklistedRegex])
     end.
 
+user_agent() ->
+    {ok, Vsn} = application:get_key(rebar, vsn),
+    ?FMT("Rebar/~s (OTP/~s)", [Vsn, otp_release()]).
+
 %% ====================================================================
 %% Internal functions
 %% ====================================================================