[tools-build,make,project] Disallow parent of repo as --build args

Resolves #2081

tools/build.py

@@ -38,6 +38,7 @@ from tools.build_api import print_build_results
 from tools.settings import CPPCHECK_CMD, CPPCHECK_MSG_FORMAT
 from utils import argparse_filestring_type
 from tools.settings import CPPCHECK_CMD, CPPCHECK_MSG_FORMAT, CLI_COLOR_MAP
+from utils import argparse_filestring_type, argparse_dir_not_parent
 
 if __name__ == '__main__':
     start = time()
@@ -48,7 +49,7 @@ if __name__ == '__main__':
     parser.add_argument("--source", dest="source_dir", type=argparse_filestring_type,
                         default=None, help="The source (input) directory", action="append")
 
-    parser.add_argument("--build", dest="build_dir",
+    parser.add_argument("--build", dest="build_dir", type=argparse_dir_not_parent(ROOT),
                       default=None, help="The build (output) directory")
 
     parser.add_argument("--no-archive", dest="no_archive", action="store_true",

tools/make.py

@@ -45,6 +45,7 @@ from tools.build_api import build_project
 from tools.build_api import mcu_toolchain_matrix
 from utils import argparse_filestring_type
 from utils import argparse_many
+from utils import argparse_dir_not_parent
 from argparse import ArgumentTypeError
 from tools.toolchains import mbedToolchain
 from tools.settings import CLI_COLOR_MAP
@@ -112,7 +113,7 @@ if __name__ == '__main__':
                        default=None, help="The source (input) directory", action="append")
     parser.add_argument("--duration", type=int, dest="duration",
                       default=None, help="Duration of the test")
-    parser.add_argument("--build", dest="build_dir",
+    parser.add_argument("--build", dest="build_dir", type=argparse_dir_not_parent(ROOT),
                       default=None, help="The build (output) directory")
     parser.add_argument("-N", "--artifact-name", dest="artifact_name",
                       default=None, help="The built project's name")

tools/project.py

@@ -12,8 +12,9 @@ from tools.export import export, EXPORTERS, mcu_ide_matrix
 from tools.tests import TESTS, TEST_MAP
 from tools.tests import test_known, test_name_known
 from tools.targets import TARGET_NAMES
+from tools.libraries import LIBRARIES
 from utils import argparse_filestring_type, argparse_many
-from utils import argparse_force_lowercase_type, argparse_force_uppercase_type
+from utils import argparse_force_lowercase_type, argparse_force_uppercase_type, argparse_dir_not_parent
 from project_api import setup_project, perform_export, print_results, get_lib_symbols
 
 
@@ -59,6 +60,7 @@ if __name__ == '__main__':
                       dest="build",
                       action="store_true",
                       default=False,
+                        type=argparse_dir_not_parent(ROOT),
                       help="use the mbed library build, instead of the sources")
 
     group.add_argument("-L", "--list-tests",

tools/utils.py

@@ -21,7 +21,7 @@ import argparse
 import math
 from os import listdir, remove, makedirs
 from shutil import copyfile
-from os.path import isdir, join, exists, split, relpath, splitext
+from os.path import isdir, join, exists, split, relpath, splitext, abspath, commonprefix
 from subprocess import Popen, PIPE, STDOUT, call
 import json
 from collections import OrderedDict
@@ -307,3 +307,14 @@ def columnate(strings, seperator=", ", chars=80):
             append = append.ljust(total_width)
         output += append
     return output
+
+# fail if argument provided is a parent of the specified directory
+def argparse_dir_not_parent(other):
+    def parse_type(not_parent):
+        abs_other = abspath(other)
+        abs_not_parent = abspath(not_parent)
+        if abs_not_parent == commonprefix([abs_not_parent, abs_other]):
+            raise argparse.ArgumentTypeError("{0} may not be a parent directory of {1}".format(not_parent, other))
+        else:
+            return not_parent
+    return parse_type