== Getting source RPMs with _yumdownloader_ (part 2)

To follow up the [[first installment YumdownloaderSource]], it turns out
that enabling the source repositories has a side effect that I didn't
think about at the time: it no longer looks in the default repositories.

(This is a general thing in _yumdownloader_: any time you specify a
repository explicitly, it disables all the default ones. This makes
me grumpy. While you can argue that this makes a sort of sense, it
is not how _yum_ itself behaves when you enable repositories, *and*
_yumdownloader_ uses the exact same command line switch that _yum_
does, so people are going to expect it to behave the same.)

This matters because there are binary RPMs that are built from source
RPMs with different names; the obvious case is most of the _-devel_
RPMs, but there are a number of others that are less obvious (this
is why the extra mapping step mentioned in the [[first installment]]
exists). Unfortunately _yumdownloader_ consults the normal binary
RPM repositories to find this information, and without them gets
nowhere.

(At least you get an error message.)

Since this means that you now really want to give _yumdownloader_
at least *seven* switches (six of them with arguments) to download
source RPMs, I now have a shell script I call _yumsource_:

 ; cat yumsource
 #!/bin/sh
 yumdownloader --source \
     -e core-source -e core \
     -e extras-source -e extras \
     -e updates-source -e updates \
     "$@"

(Add extra repositories to taste. I admit my real script has the
[[livna repository http://rpm.livna.org/]] too.)