Generate new map files when starting a recovery

This is done to define the domain size and let us use --complete-only.

This also enables us to open ddrescueview immediately since that tool
requires a valid map file from the start.  If you open an empty map
file ddrescueview doesn't auto-reload the file correctly.

Addresses #184

scripts/wk/cfg/ddrescue.py

@@ -20,6 +20,10 @@ AUTO_PASS_THRESHOLDS = {
   'trim': 98,
   'scrape': float('inf'),
   }
+DDRESCUE_MAP_TEMPLATE = '''# Mapfile. Created by {name}
+0x0 ? 1
+0x0 {size:#x} ?
+'''
 DDRESCUE_SETTINGS = {
   'Default': {
     '--binary-prefixes':  {'Selected': True,                'Hidden': True, },

scripts/wk/hw/ddrescue.py

@@ -22,7 +22,7 @@ import psutil
 import pytz
 
 from wk import cfg, debug, exe, io, log, net, std, tmux
-from wk.cfg.ddrescue import DDRESCUE_SETTINGS
+from wk.cfg.ddrescue import DDRESCUE_MAP_TEMPLATE, DDRESCUE_SETTINGS
 from wk.hw import obj as hw_obj
 
 
@@ -139,7 +139,7 @@ class BlockPair():
       self.view_proc = None
 
 
-    # Set map file
+    # Set map path
     # e.g. '(Clone|Image)_Model[_p#]_Size[_Label].map'
     map_name = model if model else 'None'
     if source.details['bus'] == 'Image':
@@ -148,7 +148,7 @@ class BlockPair():
       part_num = re.sub(r"^.*?(\d+)$", r"\1", source.path.name)
       map_name += f'_p{part_num}'
     size_str = std.bytes_to_string(
-      size=source.details["size"],
+      size=self.size,
       use_binary=False,
       )
     map_name += f'_{size_str.replace(" ", "")}'
@@ -164,7 +164,17 @@ class BlockPair():
     else:
       # Cloning
       self.map_path = pathlib.Path(f'{working_dir}/Clone_{map_name}.map')
-    self.map_path.touch()
+
+    # Create map file if needed
+    # NOTE: We need to set the domain size for --complete-only to work
+    if not self.map_path.exists():
+      self.map_path.write_text(
+        data=DDRESCUE_MAP_TEMPLATE.format(
+          name=cfg.main.KIT_NAME_FULL,
+          size=self.size,
+          ),
+        encoding='utf-8',
+      )
 
     # Set initial status
     self.set_initial_status()
@@ -2044,8 +2054,12 @@ def run_ddrescue(state, block_pair, pass_name, settings, dry_run=True):
     LOG.info('ddrescue cmd: %s', cmd)
     return
 
-  # Start ddrescue
+  # Start ddrescue and ddrescueview
   proc = exe.popen_program(cmd)
+  exe.popen_program(
+    ['ddrescueview', '-r', '5s', block_pair.map_path],
+    pipe=True,
+    )
 
   # ddrescue loop
   _i = 0
@@ -2062,15 +2076,6 @@ def run_ddrescue(state, block_pair, pass_name, settings, dry_run=True):
         std.print_error(warning_message)
         break
 
-      # Open ddrescueview
-      ## NOTE: This needs to be started a bit into the recovery since it needs
-      ##       a non-zero map file to read
-      if not block_pair.view_proc and _i > 1:
-        block_pair.view_proc = exe.popen_program(
-          ['ddrescueview', '-r', '5s', block_pair.map_path],
-          pipe=True,
-          )
-
     if _i % 60 == 0:
       # Clear ddrescue pane
       tmux.clear_pane()