Proposal: contrib/bpf_inspect.py: disas bpf prog with capstone

[Asphaltt]

I've read Add disassembler.

So, I try to disas bpf prog with capstone.

Here's an example.

$ sudo drgn ./contrib/bpf_inspect.py i
For help, type help(drgn).
>>> import drgn
>>> from drgn import NULL, Object, cast, container_of, execscript, offsetof, reinterpret, sizeof, stack_trace
>>> from drgn.helpers.common import *
>>> from drgn.helpers.linux import *
>>> list_bpf_progs()
     2: BPF_PROG_TYPE_TRACING            hid_tail_call
  2295: BPF_PROG_TYPE_EXT                entry                            tail_call_reachable
  2400: BPF_PROG_TYPE_EXT                entry                            tail_call_reachable
  3810: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_egress
  3811: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_ingress
  3812: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  3813: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  3814: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  3815: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  3816: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_egress
  3817: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_ingress
  3818: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  3819: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_egress
  3820: BPF_PROG_TYPE_CGROUP_SKB         sd_fw_ingress
  3821: BPF_PROG_TYPE_CGROUP_DEVICE      sd_devices
  4235: BPF_PROG_TYPE_SCHED_CLS          entry1
>>> p = get_bpf_prog_by_id(4235)
>>> subprog = p.get_subprog(2)
>>> print("\n".join(subprog.disas()))
/usr/local/lib/python3.12/dist-packages/capstone/__init__.py:380: UserWarning: Module _drgn was already imported from /usr/lib/python3/dist-packages/_drgn.cpython-312-x86_64-linux-gnu.so, but /root/shares/Projects/leonhwang/drgn-bpf is being added to sys.path
  import pkg_resources
/usr/local/lib/python3.12/dist-packages/capstone/__init__.py:380: UserWarning: Module drgn was already imported from /usr/lib/python3/dist-packages/drgn/__init__.py, but /root/shares/Projects/leonhwang/drgn-bpf is being added to sys.path
  import pkg_resources
0xffffffffc009ed48:	0f 1f 44 00 00     	nop	dword ptr [rax + rax]
0xffffffffc009ed4d:	66 90              	nop
0xffffffffc009ed4f:	55                 	push	rbp
0xffffffffc009ed50:	48 89 e5           	mov	rbp, rsp
0xffffffffc009ed53:	48 bf 22 79 bc 81 01 99 ff ff	movabs	rdi, 0xffff990181bc7922
0xffffffffc009ed5d:	be 12 00 00 00     	mov	esi, 0x12
0xffffffffc009ed62:	e8 89 90 44 c4     	call	0xffffffff844e7df0
0xffffffffc009ed67:	31 c0              	xor	eax, eax
0xffffffffc009ed69:	c9                 	leave
0xffffffffc009ed6a:	c3                 	ret
0xffffffffc009ed6b:	cc                 	int3

But, if import capstone directly, it warns cyclic import.