Close #334: Check if pkgname is the aport folder name (#347)

...and remove an redundant sentence with broken grammar in another
error message.

pmb/parse/apkbuild.py

@@ -16,6 +16,8 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
 """
+import os
+import logging
 import pmb.config
 
 
@@ -134,6 +136,15 @@ def apkbuild(args, path):
             else:
                 ret[attribute] = ""
 
+    # Sanity check: pkgname
+    suffix = "/" + ret["pkgname"] + "/APKBUILD"
+    if not os.path.realpath(path).endswith(suffix):
+        logging.info("Folder: '" + os.path.dirname(path) + "'")
+        logging.info("Pkgname: '" + ret["pkgname"] + "'")
+        raise RuntimeError("The pkgname must be equal to the name of"
+                           " the folder, that contains the APKBUILD!")
+
+    # Fill cache
     ret = replace_variables(ret)
     ret = cut_off_function_names(ret)
     args.cache["apkbuild"][path] = ret

pmb/parse/arguments.py

@@ -259,7 +259,6 @@ def arguments():
                              " forward. Simply enable it in pmb/config/__init__.py"
                              " in build_device_architectures, zap your package cache"
                              " (otherwise you will have issues with noarch packages)"
-                             " and try again. Some other things might break, but"
-                             " they should be easy to fix them.")
+                             " and try again.")
 
     return args