bin/show: Add --print-sizes option to show sizes metadata

Use the new `ostree_commit_get_object_sizes()` API to read the
`ostree.sizes` commit metadata and print a summary.

tests/test-pull-sizes.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# Copyright (C) 2019 Endless Mobile, Inc.
+#
+# SPDX-License-Identifier: LGPL-2.0+
+#
+# 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 -euo pipefail
+
+. $(dirname $0)/libtest.sh
+
+setup_fake_remote_repo1 "archive" "--generate-sizes"
+
+echo '1..3'
+
+cd ${test_tmpdir}
+mkdir repo
+ostree_repo_init repo
+${CMD_PREFIX} ostree --repo=repo remote add --set=gpg-verify=false origin $(cat httpd-address)/ostree/gnomerepo
+
+# Pull commit metadata only. All size and objects will be needed.
+${CMD_PREFIX} ostree --repo=repo pull --commit-metadata-only origin main
+${CMD_PREFIX} ostree --repo=repo show --print-sizes origin:main > show.txt
+assert_file_has_content show.txt 'Compressed size (needed/total): 637[  ]bytes/637[  ]bytes'
+assert_file_has_content show.txt 'Unpacked size (needed/total): 457[  ]bytes/457[  ]bytes'
+assert_file_has_content show.txt 'Number of objects (needed/total): 10/10'
+echo "ok sizes commit metadata only"
+
+# Pull the parent commit so we get most of the objects
+parent=$(${CMD_PREFIX} ostree --repo=repo rev-parse origin:main^)
+${CMD_PREFIX} ostree --repo=repo pull origin ${parent}
+${CMD_PREFIX} ostree --repo=repo show --print-sizes origin:main > show.txt
+assert_file_has_content show.txt 'Compressed size (needed/total): 501[  ]bytes/637[  ]bytes'
+assert_file_has_content show.txt 'Unpacked size (needed/total): 429[  ]bytes/457[  ]bytes'
+assert_file_has_content show.txt 'Number of objects (needed/total): 6/10'
+echo "ok sizes commit partial"
+
+# Finish pulling the commit and check that no objects needed
+${CMD_PREFIX} ostree --repo=repo pull origin main
+${CMD_PREFIX} ostree --repo=repo show --print-sizes origin:main > show.txt
+assert_file_has_content show.txt 'Compressed size (needed/total): 0[  ]bytes/637[  ]bytes'
+assert_file_has_content show.txt 'Unpacked size (needed/total): 0[  ]bytes/457[  ]bytes'
+assert_file_has_content show.txt 'Number of objects (needed/total): 0/10'
+echo "ok sizes commit full"