spf-download [$SP_ROOT]/package/host/example.org/foreign/foo[+spf+tag][-2.0[+spf+tag]] [...]
spf-download downloads one or more package source archives
(typically tarballs, but some other formats are also supported). It is
typically invoked by way of
spf-unpack. For each package
directory name given on the command line, it loads the package's info snippet
package/foreign_info within the package directory (or the
file named in
$SPF_INFO if that variable is set), and then
downloads the source archives from the URLs listed in the snippet.
The archives are stored in "
$SP_TARDIR_FLAT", if that
variable is set, or
$SP_TARDIR/host/example.org/foreign", if that
variable is set, or else
If the tarball already exists locally in any of the above directories,
spf-download will not download the tarball again. If
$SP_OFFLINE_SRC is set to "
spf-download will fail instead of downloading if the tarball does
not already exist locally.