Build: refactor fetch for contrib tarballs

Fetch is now python-based and runs on the same version as does
configure. The source script is make/fetch.py. New features:

MD5 hash tracking for tarballs. Data values for all contribs added.
Upon download, the file will be verified, and only then will it be moved
into place inside downloads/ . Files that exist before the build system
does a fetch will not be md5-checked.

Multiple URLs for tarballs. Each module may specify one or more URLs and
by convention the official HandBrake should be first when possible. Each
URL is tried in sequence, and if it fails for any reason, the next URL
is tried. If no URL succeeds, a hard-error is reported.

Network fetching may be disabled via configure options. --disable-fetch
will hard-error if a fetch is attempted. --accept-fetch-url=SPEC and
--deny-fetch-url=SPEC offer an ACL-style mechanism using regex to match
against URLs. For example, --accept-fecth-url='.*/download.handbrake.fr/.*'
would skip any non-matching URLs.

Build dependencies have been lightened. wget and curl are no longer
required. TODO: GTK packaging should also be able to remove those deps.

1 files changed, 25 insertions, 0 deletions

diff --git a/make/python_launcher b/make/python_launcher
new file mode 100755
index 000000000..c2d9d8da0
--- /dev/null
+++ b/make/python_launcher
@@ -0,0 +1,25 @@
+#! /bin/sh
+#
+
+inpath()
+{
+    IFS=:
+    for d in $PATH
+    do
+        if [ -x $d/$1 ]; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+for p in python2.7 python2.6 python2.5 python2.4 python2 python
+do
+    if ( inpath $p ); then
+        exec $p "$@"
+        exit 0
+    fi
+done
+
+echo "ERROR: no suitable version of python found."
+exit 1