modhack is collection of utilities to manipulate wit Erlang modules.
- alias(Target, Alias) --- make an alias for module Target (indeed it is proxy)
- copy(Source, Destination) --- copy module at binary-level
- overlay([Mod1, Mod2|...], ResultName) --- combine modules into one supermodule
- patch(Module, Patch) or patch(Module, [Patch1|...]) --- modify Module so that functions existing in Patches take precedence.
Eshell V5.9 (abort with ^G)
1> victim:module_info(exports).
[{fun4,0},{module_info,0},{module_info,1}]
2> modhack:overlay([mod1, mod2, mod3], victim).
{module,victim}
3> victim:module_info(exports).
[{fun2,0},
{fun3,0},
{fun2,1},
{fun1,0},
{module_info,0},
{module_info,1}]
4> victim:fun1().
mod1
5> victim:fun2(x).
{mod2,x}
6> victim:fun2().
mod3
7> l(victim), victim:module_info(exports).
[{fun4,0},{module_info,0},{module_info,1}]
8> modhack:patch(victim, mod1), victim:fun1().
mod1
-module(mod1).
-compile(export_all).
fun1() -> ?MODULE.
-module(mod2).
-compile(export_all).
fun1() -> ?MODULE.
fun2(Arg) -> {?MODULE, Arg}.
-module(mod3).
-compile(export_all).
fun2() -> ?MODULE.
fun3() -> ?MODULE.
-module(victim).
-compile(export_all).
fun4() -> ?MODULE.
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