[jhbuild] jhbuild: Set default tarballdir to ~/.cache/jhbuild/downloads

[Philip Withnall <pwithnall src gnome org>]

commit 89bab4d4843ae792164ea0d6ecde405b01b0190d
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Sun Jan 25 10:19:22 2015 +0000

    jhbuild: Set default tarballdir to ~/.cache/jhbuild/downloads
    
    Rather than ~/jhbuild/downloads. Let’s be tidy.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=743469

 doc/C/index.docbook        |    2 +-
 jhbuild/defaults.jhbuildrc |    5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/doc/C/index.docbook b/doc/C/index.docbook
index c37f502..7414d06 100644
--- a/doc/C/index.docbook
+++ b/doc/C/index.docbook
@@ -2284,7 +2284,7 @@ Optional packages: (JHBuild will build the missing packages)
               This is useful if you have multiple JHBuild environments or
               regularly clear out <varname>checkoutroot</varname> and want to
               reduce bandwidth usage.  Defaults to
-              <literal>'~/jhbuild/downloads'</literal>.</simpara>
+              <literal>'~/.cache/jhbuild/downloads'</literal>.</simpara>
           </listitem>
         </varlistentry>
         <varlistentry id="cfg-tinderbox-outputdir">
diff --git a/jhbuild/defaults.jhbuildrc b/jhbuild/defaults.jhbuildrc
index 85d4a0a..4b9a390 100644
--- a/jhbuild/defaults.jhbuildrc
+++ b/jhbuild/defaults.jhbuildrc
@@ -49,7 +49,10 @@ if os.path.exists(os.path.expanduser('~/checkout/gnome')):
 else:
     checkoutroot = '~/jhbuild/checkout/'
 
-tarballdir = '~/jhbuild/downloads/'
+xdg_cache_home = os.environ.get('XDG_CACHE_HOME',
+                                os.path.join(os.path.expanduser('~'),
+                                             '.cache'))
+tarballdir = os.path.join(xdg_cache_home, 'jhbuild', 'downloads')
 
 buildroot = None     # if set, packages will be built with srcdir!=builddir