spec: Install symlink /usr/bin/git-obs to /usr/libexec/git/obs to make git-obs available as a git sub-command

contrib/osc.spec

@@ -81,7 +81,7 @@ BuildRequires:  diffstat
 %if %{with fdupes}
 BuildRequires:  fdupes
 %endif
-# needed for git scm tests
+# needed for git scm tests and directory ownership of /usr/libexec/git for git-obs symlink
 BuildRequires:  git-core
 
 Requires:       %{use_python_pkg}-cryptography
@@ -147,6 +147,10 @@ for a general introduction.
 %build
 %{use_python} setup.py build
 
+# symlink /usr/bin/git-obs to /usr/libexec/git/obs
+mkdir -p %{buildroot}%{_libexecdir}/git
+ln -s %{_bindir}/git-obs %{buildroot}%{_libexecdir}/git/obs
+
 # write rpm macros
 cat << EOF > macros.osc
 %%osc_plugin_dir %{osc_plugin_dir}
@@ -171,6 +175,9 @@ sphinx-build -b man doc .
 %install
 %{use_python} setup.py install -O1 --skip-build --force --root %{buildroot} --prefix %{_prefix}
 
+# copy git obs sub-command symlink
+install -d %{buildroot}%{_libexecdir}/git/obs
+
 # create plugin dirs
 install -d %{buildroot}%{osc_plugin_dir}
 install -d %{buildroot}%{_sharedstatedir}/osc-plugins
@@ -212,6 +219,7 @@ install -Dm0644 oscrc.5 %{buildroot}%{_mandir}/man5/oscrc.5
 
 # executables
 %{_bindir}/*
+%{_libexecdir}/git/obs
 
 # python modules
 %{python_sitelib}/osc