Allow setting debugger path via context.gdb_binary (#2527)

* Allow setting debugger path via context

* Update changelog

CHANGELOG.md

@@ -73,18 +73,19 @@ The table below shows which release corresponds to each branch, and what date th
 | [2.2.0](#220)    |          | Jan 5, 2015
 
 ## 5.0.0 (`dev`)
-
 - [#2507][2507] Add `+LINUX` and `+WINDOWS` doctest options and start proper testing on Windows
 - [#2522][2522] Support starting a kitty debugging window with the 'kitten' command
 - [#2524][2524] Raise EOFError during `process.recv` when stdout closes on Windows
 - [#2526][2526] Properly make use of extra arguments in `packing` utilities. `sign` parameter requires keyword syntax to specify it.
 - [#2517][2517] Allow to passthru kwargs on `ssh.__getattr__` convenience function to fix SSH motd problems
+- [#2527][2527] Allow setting debugger path via `context.gdb_binary`
 
 [2507]: https://github.com/Gallopsled/pwntools/pull/2507
 [2522]: https://github.com/Gallopsled/pwntools/pull/2522
 [2524]: https://github.com/Gallopsled/pwntools/pull/2524
 [2526]: https://github.com/Gallopsled/pwntools/pull/2526
 [2517]: https://github.com/Gallopsled/pwntools/pull/2517
+[2527]: https://github.com/Gallopsled/pwntools/pull/2527
 
 ## 4.15.0 (`beta`)
 - [#2508][2508] Ignore a warning when compiling with asm on nix

pwnlib/context/__init__.py

@@ -363,6 +363,7 @@ class ContextType(object):
         'encoding': 'auto',
         'endian': 'little',
         'gdbinit': "",
+        'gdb_binary': "",
         'kernel': None,
         'local_libcdb': "/var/lib/libc-database",
         'log_level': logging.INFO,
@@ -1546,6 +1547,20 @@ 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

@@ -750,6 +750,12 @@ def binary():
         >>> gdb.binary() # doctest: +SKIP
         '/usr/bin/gdb'
     """
+    if context.gdb_binary:
+        gdb = misc.which(context.gdb_binary)
+        if not gdb:
+            log.warn_once('Path to gdb binary `{}` not found'.format(context.gdb_binary))
+        return gdb
+
     gdb = misc.which('pwntools-gdb') or misc.which('gdb')
 
     if not context.native: