feat: Split and improve contract migration steps

apps/data-seeding/common/dirs.py

@@ -0,0 +1,42 @@
+# standard imports
+import os
+import shutil
+import sys
+
+
+def initialize_dirs(user_dir, force_reset=False):
+
+    dirs = {}
+
+    dirs['old'] = os.path.join(user_dir, 'old')
+    dirs['new'] = os.path.join(user_dir, 'new')
+    dirs['meta'] = os.path.join(user_dir, 'meta')
+    dirs['custom'] = os.path.join(user_dir, 'custom')
+    dirs['preferences'] = os.path.join(user_dir, 'preferences')
+    dirs['txs'] = os.path.join(user_dir, 'txs')
+    dirs['keyfile'] = os.path.join(user_dir, 'keystore')
+    dirs['custom_new'] = os.path.join(dirs['custom'], 'new')
+    dirs['custom_meta'] = os.path.join(dirs['custom'], 'meta')
+    dirs['preferences_meta'] = os.path.join(dirs['preferences'], 'meta')
+    dirs['preferences_new'] = os.path.join(dirs['preferences'], 'new')
+
+    try:
+        os.stat(dirs['old'])
+    except FileNotFoundError:
+        sys.stderr.write('no users to import. please run create_import_users.py first\n')
+        sys.exit(1)
+
+    if force_reset:
+        for d in dirs.keys():
+            if d == 'old':
+                continue
+            try:
+                shutil.rmtree(dirs[d])
+            except FileNotFoundError:
+                pass
+    for d in dirs.keys():
+        if d == 'old':
+            continue
+        os.makedirs(dirs[d])
+
+    return dirs