[Fedora-packaging] How to make a Provides based on package contents?

[Orion Poplawski]

Ville Skyttä wrote:
> 
> One KISS way to handle this is to just hardcode the API version in a
> macro in the octave specfile, bump it between package versions as
> appropriate, and add a test in %check which will cause the octave
> package build to fail if you forgot to bring the hardcoded value up to
> date with the sources when updating the package.

How does this sound:

octave.spec:

@@ -1,3 +1,6 @@
+# From src/version.h:#define OCTAVE_API_VERSION
+%define octave_api api-v22
+
  Name:           octave
  Version:        2.9.9
  Release:        1%{?dist}
@@ -18,6 +21,7 @@
  BuildRequires:  readline-devel glibc-devel fftw-devel gperf ghostscript
  BuildRequires:  ufsparse-devel glpk-devel gnuplot desktop-file-utils
  BuildRoot: 
%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+Provides:       octave(%{octave_api})


  %description
@@ -49,6 +53,12 @@

  %prep
  %setup -q
+# Check that octave_api is set correctly
+if ! grep -q '^#define OCTAVE_API_VERSION "%{octave_api}"' src/version.h
+then
+  echo "octave_api variable in spec does not match src/version.h"
+  exit 1
+fi


  %build


Then in an octave module:

%{!?octave_api: %define octave_api %(octave-config -p API_VERSION)}

Requires:       octave(%{octave_api})



I went with octave(%{octave_api}) rather than octave(api) = 
%{octave_api} because I was getting errors when starting to build a 
package in mock that octave(api) was not being set to anything (during 
the buildroot setup phase - octave-config is unavailable there).  If 
someone can point me around that, that would be great.

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion at cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com