Allow setting debugger path via context

Author: Ninja3047

pwnlib/context/__init__.py

@@ -359,6 +359,7 @@ class ContextType(object):
         'encoding': 'auto',
         'endian': 'little',
         'gdbinit': "",
+        'gdb_binary': "",
         'kernel': None,
         'local_libcdb': "/var/lib/libc-database",
         'log_level': logging.INFO,
@@ -1539,6 +1540,20 @@ def gdbinit(self, value):
         """
         return str(value)
 
+    @_validator
+    def gdb_binary(self, value):
+        """Path to the binary that is used when running GDB locally.
+
+        This is useful when you have multiple versions of gdb installed or the gdb binary is
+        called something different.
+
+        If set to an empty string, pwntools will try to search for a reasonable gdb binary from 
+        the path.
+
+        Default value is ``""``.
+        """
+        return str(value)
+
     @_validator
     def cyclic_alphabet(self, alphabet):
         """Cyclic alphabet.

pwnlib/gdb.py

@@ -750,7 +750,10 @@ def binary():
         >>> gdb.binary() # doctest: +SKIP
         '/usr/bin/gdb'
     """
-    gdb = misc.which('pwntools-gdb') or misc.which('gdb')
+    if context.gdb_binary:
+        gdb = misc.which(context.gdb_binary)
+    else:
+        gdb = misc.which('pwntools-gdb') or misc.which('gdb')
 
     if not context.native:
         multiarch = misc.which('gdb-multiarch')