[Bug 1297132] New: RFE: Use the %__erlang_provides macro in the spec file

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1297132

Bug ID: 1297132
           Summary: RFE: Use the %__erlang_provides macro in the spec file
           Product: Fedora
           Version: rawhide
         Component: erlang
          Severity: low
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail], [e-mail], [e-mail]

I noticed that there is a handy %__erlang_provides_requires macro in
/usr/lib/rpm/macros.d/macros.erlang and attempted to use it on one of my
packages. Unfortunately, this causes my package to depend on lots of Erlang
built-ins and the erlang package doesn't mark itself as providing these
built-ins. For example, when I use that macro in my erlang-oauth2 package, it
fails to install like this:

$ sudo dnf install erlang-oauth2/results/erlang-oauth2-0.6.0-3.fc24.x86_64.rpm
Last metadata expiration check performed 1:57:49 ago on Sat Jan  9 10:17:18
2016.
Error: nothing provides erlang(application:get_env/2) needed by
erlang-oauth2-0.6.0-3.fc24.x86_64
(try to add '--allowerasing' to command line to replace conflicting packages)

In the meantime, I can work around this issue by using the correct Requires on
my package but it would be a nice improvement if we could get that
automatically working, especially since somebody took the time to write that
fancy macro.

[Bug 1297132] RFE: Use the %__erlang_provides macro in the spec file

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1297132

Peter Lemenkov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Peter Lemenkov  ---
Initially erlang-rpm-macros was written for a very outdated RPM version (can't
remember what was used in 2009), and it contains a lot of ugly workarounds and
shortcomings. Fortunately RPM evolved significantly so a lot of these ugly
things should just be trashed (which I did already, actually).

I;ve added a lot of fun stuff (automatic dependency picker), so starting from
the next erlang-rpm-macros version we should really start using it.

[Bug 1297132] RFE: Use the %__erlang_provides macro in the spec file

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1297132

--- Comment #2 from Randy Barlow  ---
Hey Peter! I've enjoyed the new automatic dependency system you've developed.
I'm happy to close this bug if you are. Thanks!

[Bug 1297132] RFE: Use the %__erlang_provides macro in the spec file

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1297132

--- Comment #3 from Peter Lemenkov  ---
(In reply to Randy Barlow from comment #2)
> Hey Peter! I've enjoyed the new automatic dependency system you've
> developed. I'm happy to close this bug if you are. Thanks!

We'd better keep it for a while since there is one missing piece - Erlang/OTP
itself which doesn't use these macros (yet).