diff --git a/swh/dataset/cli.py b/swh/dataset/cli.py
new file mode 100644
--- /dev/null
+++ b/swh/dataset/cli.py
@@ -0,0 +1,55 @@
+# Copyright (C) 2019  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+import uuid
+import click
+import functools
+
+from swh.core import config
+from swh.core.cli import CONTEXT_SETTINGS
+from swh.dataset import graph
+from swh.journal.cli import get_journal_client
+
+
+@click.group(name='dataset', context_settings=CONTEXT_SETTINGS)
+@click.option('--config-file', '-C', default=None,
+              type=click.Path(exists=True, dir_okay=False,),
+              help="Configuration file.")
+@click.pass_context
+def cli(ctx, config_file):
+    '''Software Heritage Dataset Tools'''
+    ctx.ensure_object(dict)
+
+    conf = config.read(config_file)
+    ctx.obj['config'] = conf
+
+
+@cli.command('export-graph')
+@click.argument('export-path', type=click.File('w'))
+@click.option('--export-id', '-e', help="Unique ID of the export run.")
+@click.pass_context
+def export_graph(ctx, export_path, export_id):
+    if not export_id:
+        export_id = str(uuid.uuid4())
+    client = get_journal_client(
+        ctx,
+        object_types=[
+            'origin_visit',
+            'snapshot',
+            'release',
+            'revision',
+            'directory',
+        ],
+        group_id=('swh-dataset-export-' + export_id)
+    )
+    process_messages = functools.partial(graph.process_messages,
+                                         output=export_path)
+    nb_messages = 0
+    try:
+        while True:
+            nb_messages += client.process(process_messages)
+            print('Processed {} messages.'.format(nb_messages))
+    except KeyboardInterrupt:
+        ctx.exit(0)
diff --git a/swh/dataset/graph.py b/swh/dataset/graph.py
new file mode 100644
--- /dev/null
+++ b/swh/dataset/graph.py
@@ -0,0 +1,39 @@
+# Copyright (C) 2019  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from swh.model.identifiers import origin_identifier
+from swh.model.hashutil import hash_to_hex
+
+
+def process_messages(messages, output):
+    def write(src, dst):
+        if src is None or dst is None:
+            return
+        print(hash_to_hex(src), hash_to_hex(dst), file=output)
+
+    """
+    for origin in messages['origin']:
+        for src in origin:
+            print(src, dst, file=output)
+    """
+    for visit in messages.get('origin_visit', []):
+        write(origin_identifier({'url': visit['origin']}), visit['snapshot'])
+
+    for snapshot in messages.get('snapshot', []):
+        for branch in snapshot['branches'].values():
+            while branch['target_type'] == 'alias':
+                branch = snapshot['branches'][branch['target']]
+            write(snapshot['id'], branch['target'])
+
+    for release in messages.get('release', []):
+        write(release['id'], release['target'])
+
+    for revision in messages.get('revision', []):
+        for parent in revision['parents']:
+            write(revision['id'], parent)
+
+    for directory in messages.get('directory', []):
+        for entry in directory['entries']:
+            write(directory['id'], entry['target'])