macros: Use /bin/bash instead of /bin/sh by default

RPM spec files (and %build/%install sections) assume certain bashisms,
such as pushd, brace'd globs (i.e mkdir {bin,lib}), etc. Currently, rpm
macros as upstream enforce /bin/sh as the shebang for the rpmbuild generated .sh.
This works okay as long as /bin/sh points to bash, however this is not
necessarily the case, and plenty of distros have/are switching to other
shells such as dash by default for /bin/sh scripts.

Since we aren't going to fix all spec files any time soon, use /bin/bash
as the default %{_buildshell} value. This makes sure rpmbuild works
without a hitch on such systems.

Signed-off-by: Pedro Falcato <[email protected]>

macros.in

@@ -118,7 +118,7 @@
 %_builddir		%{_topdir}/BUILD
 
 #	The interpreter used for build scriptlets.
-%_buildshell		/bin/sh
+%_buildshell		/bin/bash
 
 #	The location of the rpm database file(s).
 %_dbpath		%{_var}/lib/rpm