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rebar_utils:otp_release/0: handle vsn like x.y.z**

Browse source 
As mentioned in the OTP documentation, licensed customers may use
patched OTP installations where the otp_patch_apply tool adds a '**'
suffix as a flag saying the system consists of application versions from
multiple OTP versions. When we get such a version string, we drop the
suffix, as we cannot obtain relevant information from it as far as
tooling is concerned.
This commit is contained in:
Tuncer Ayaz 2014-07-17 20:03:56 +02:00
parent 873d236ce9
commit 9b060f2de9
2 changed files with 30 additions and 8 deletions
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22
src/rebar_utils.erl
View file

@ -384,14 +384,32 @@ otp_release1([$R,N|_]=Rel) when is_integer(N) ->
%% If OTP >= 17.x, erlang:system_info(otp_release) returns just the
%% major version number, we have to read the full version from
%% a file. See http://www.erlang.org/doc/system_principles/versions.html
%% Read vsn strinf from the 'OTP_VERSION' file and return as list without
%% the "\n".
otp_release1(Rel) ->
File = filename:join([code:root_dir(), "releases", Rel, "OTP_VERSION"]),
{ok, Vsn} = file:read_file(File),
%% NOTE: It's fine to rely on the binary module here because we
%% can be sure that it's available when the otp_release string
%% does not begin with $R.
%% Return as list without the "\n".
binary:bin_to_list(Vsn, {0, byte_size(Vsn) - 1}).
Size = byte_size(Vsn),
%% The shortest vsn string consists of at least two digits
%% followed by "\n". Therefore, it's safe to assume Size >= 3.
case binary:part(Vsn, {Size, -3}) of
<<"**\n">> ->
%% The OTP documentation mentions that a system patched
%% using the otp_patch_apply tool available to licensed
%% customers will leave a '**' suffix in the version as a
%% flag saying the system consists of application versions
%% from multiple OTP versions. We ignore this flag and
%% drop the suffix, given for all intents and purposes, we
%% cannot obtain relevant information from it as far as
%% tooling is concerned.
binary:bin_to_list(Vsn, {0, Size - 3});
_ ->
binary:bin_to_list(Vsn, {0, Size - 1})
end.
get_deprecated_3(Get, Config, OldOpt, NewOpt, Default, When) ->
case Get(Config, NewOpt, Default) of

16
test/rebar_otp_release_tests.erl
View file

@ -28,16 +28,20 @@
-include_lib("eunit/include/eunit.hrl").
otp_release_test() ->
?_assert(check_otp_release()).
check_otp_release() ->
check_otp_release_test() ->
case rebar_utils:otp_release() of
%% <= R16
[$R,N|_] when is_integer(N) ->
true;
?assert(true);
%% >= 17.x
[N|_]=Rel when is_integer(N) ->
%% Check that it has at least Major.Minor
length(string:tokens(Rel, ".")) > 1
?assert(length(string:tokens(Rel, ".")) > 1),
%% If otp_patch_apply was used and the release version has
%% a "**" suffix, we drop that part in otp_release/0.
?assertEqual(0, string:str(Rel, "*")),
%% Check that "\n" is dropped in otp_release/0.
?assertEqual(0, string:str(Rel, "\n"))
end.