flasher: Partition blacklisting (!1759)

It is dangerous to flash the boot partition on the Ouya. Doing so can
result in a bricked device. Allow deviceinfo to blacklist partitions from
ever being flashed.

pmb/config/__init__.py

@@ -267,6 +267,7 @@ deviceinfo_attributes = [
     "rootfs_image_sector_size",
     "sd_embed_firmware",
     "sd_embed_firmware_step_size",
+    "partition_blacklist",
 
     # weston
     "weston_pixman_type",

pmb/flasher/__init__.py

@@ -18,5 +18,6 @@ along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
 """
 from pmb.flasher.init import init
 from pmb.flasher.run import run
+from pmb.flasher.run import check_partition_blacklist
 from pmb.flasher.variables import variables
 from pmb.flasher.frontend import frontend

pmb/flasher/run.py

@@ -20,6 +20,17 @@ import pmb.flasher
 import pmb.chroot.initfs
 
 
+def check_partition_blacklist(args, key, value):
+    if not key.startswith("$PARTITION_"):
+        return
+
+    name = args.deviceinfo["name"]
+    if value in args.deviceinfo["partition_blacklist"].split(","):
+        raise RuntimeError("'" + value + "'" + " partition is blacklisted " +
+                           "from being flashed! See the " + name + " device " +
+                           "wiki page for more information.")
+
+
 def run(args, action, flavor=None):
     pmb.flasher.init(args)
 
@@ -48,6 +59,7 @@ def run(args, action, flavor=None):
                                            " action " + action + " for method " + method + ","
                                            " but the value for this variable is None! Is that"
                                            " missing in your deviceinfo?")
+                    check_partition_blacklist(args, key, value)
                     command[i] = command[i].replace(key, value)
 
         # Run the action

pmb/install/recovery.py

@@ -40,6 +40,9 @@ def create_zip(args, suffix):
 
     logging.info("(" + suffix + ") create recovery zip")
 
+    for key in vars:
+        pmb.flasher.check_partition_blacklist(args, key, vars[key])
+
     # Create config file for the recovery installer
     options = {
         "DEVICE": args.device,