pull: Add support for resuming downloads via range requests

Use a consistent temporary filename to download uri's.
Check for downloaded files before fetching from uri.
Download to hash.part file, then copy/move to hash.done when complete.
Add argument support to setup_fake_remote_repo1 function.
Add test for pull resume.
To implement this, pass --force-range-requests into the trivial-httpd,
which will only serve half of the objects to clients at a time.

https://bugzilla.gnome.org/show_bug.cgi?id=706344

tests/libtest.sh

@@ -120,6 +120,7 @@ setup_test_repository () {
 
 setup_fake_remote_repo1() {
     mode=$1
+    args=$2
     shift
     oldpwd=`pwd`
     mkdir ostree-srv
@@ -146,7 +147,7 @@ setup_fake_remote_repo1() {
     mkdir ${test_tmpdir}/httpd
     cd httpd
     ln -s ${test_tmpdir}/ostree-srv ostree
-    ostree trivial-httpd --daemonize -p ${test_tmpdir}/httpd-port
+    ostree trivial-httpd --daemonize -p ${test_tmpdir}/httpd-port $args
     port=$(cat ${test_tmpdir}/httpd-port)
     echo "http://127.0.0.1:${port}" > ${test_tmpdir}/httpd-address
     cd ${oldpwd} 

tests/test-pull-resume.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+#
+# Copyright (C) 2013 Jeremy Whiting <jeremy.whiting@collabora.com>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+set -e
+
+. $(dirname $0)/libtest.sh
+
+setup_fake_remote_repo1 "archive-z2" "--force-range-requests"
+
+echo '1..1'
+
+repopath=${test_tmpdir}/ostree-srv/gnomerepo
+cp -a ${repopath} ${repopath}.orig
+
+cd ${test_tmpdir}
+rm repo -rf
+mkdir repo
+${CMD_PREFIX} ostree --repo=repo init
+${CMD_PREFIX} ostree --repo=repo remote add origin $(cat httpd-address)/ostree/gnomerepo
+
+maxtries=`find ${repopath}/objects | wc -l`
+maxtries=`expr $maxtries \* 2`
+
+for ((i = 0; i < $maxtries; i=i+1))
+do
+if ${CMD_PREFIX} ostree --repo=repo pull origin main; then
+    break;
+fi
+done
+if ${CMD_PREFIX} ostree --repo=repo fsck; then
+    echo "ok, pull succeeded!"
+else
+    assert_not_reached "pull failed!"
+fi
+rm -rf ${repopath}
+cp -a ${repopath}.orig ${repopath}