[OpenWrt-Devel] python ctypes.util.find_library cannot find libc
Andrew McConachie
andrew at depht.com
Thu Jan 19 09:07:58 EST 2017
Hi Alexandru,
You're missing some kernel hardware driver. I'm not sure if the default
compile options include kernel drivers for all HDDs, or for SATA/AHCI.
You probably just need to include some extra kernel drivers in make
menuconfig.
--Andrew
On 1/19/17 04:31, Alexandru Ardelean wrote:
> Hey,
>
> So, I've tried to run an OpenWrt system, x86_64,
> https://github.com/openwrt/openwrt/commit/4e53a6e9c560b54361f9ed3639e8d12f9ab8939d
>
> It was hanging on boot.
> I've ran in Virtual Machine Manager with QEMU/KVM.
> HDD emulation is SATA/AHCI [ I checked it's SATA/AHCI ]
>
> It looks to me that it's hanging at trying to mount root device /dev/mtdblock0
> Any thoughts ?
>
> [ 1.213897] ata4: SATA link down (SStatus 0 SControl 300)
> [ 1.214781] ata2: SATA link down (SStatus 0 SControl 300)
> [ 1.215572] ata6: SATA link down (SStatus 0 SControl 300)
> [ 1.216359] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> [ 1.217229] ata1.00: ATA-7: QEMU HARDDISK, 2.3.1, max UDMA/100
> [ 1.217976] ata1.00: 31233 sectors, multi 16: LBA48 NCQ (depth 31/32)
> [ 1.218787] ata1.00: applying bridge limits
> [ 1.233284] ata1.00: configured for UDMA/100
> [ 1.234233] ata5: SATA link down (SStatus 0 SControl 300)
> [ 1.235915] ata3: SATA link down (SStatus 0 SControl 300)
> [ 1.237371] scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK
> 1 PQ: 0 ANSI: 5
> [ 1.239155] sd 0:0:0:0: [sda] 31233 512-byte logical blocks: (16.0
> MB/15.3 MiB)
> [ 1.241487] sd 0:0:0:0: [sda] Write Protect is off
> [ 1.242882] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [ 1.245329] sda: sda1 sda2
> [ 1.245887] sda: p2 size 262144 extends beyond EOD, enabling native capacity
> [ 1.247232] sda: sda1 sda2
> [ 1.247784] sda: p2 size 262144 extends beyond EOD, truncated
> [ 1.248864] sd 0:0:0:0: [sda] Attached SCSI disk
> [ 1.256721] block2mtd: erasesize must be a divisor of device size
> [ 1.259958] rtc_cmos 00:00: setting system clock to 2017-01-19
> 09:27:33 UTC (1484818053)
> [ 1.261388] Waiting for root device /dev/mtdblock0...
>
> On Wed, Jan 18, 2017 at 6:05 PM, Alexandru Ardelean
> <ardeleanalex at gmail.com> wrote:
>> Hey,
>>
>> So, if you try on the system.
>>
>> echo /usr/sbin/modprobe > /proc/sys/kernel/modprobe
>>
>> Does it work ? I mean to just import iptc ?
>> It worked for me, but I tried on a LEDE system (x86_64), which I'm
>> hoping may be similar to OpenWrt.
>>
>> For me, the part that interests me the most, is if this is a bug
>> within Python [ since I maintain it ], and it runs on both LEDE &
>> OpenWrt.
>>
>> Will try to spin up a OpenWrt [just cloned trunk from Github ].
>>
>> And I'll try to reproduce.
>> For reference ; Python is version 2.7.13
>> It's from here: https://github.com/openwrt/packages
>>
>> I could not find hash 5ba298c in OpenWrt [
>> https://github.com/openwrt/openwrt ] nor in packages [ link above ].
>>
>> Will come back with findings for OpenWrt.
>>
>> In the meantime, I will see about proposing a solution for updating
>> /proc/sys/kernel/modprobe correctly for both LEDE & OpenWrt.
>>
>> Thanks
>> Alex
>>
>>
>>
>> On Wed, Jan 18, 2017 at 4:38 PM, Andrew McConachie <andrew at depht.com> wrote:
>>> Hi 郭涛 and Alexandru,
>>>
>>> ldconfig depends on using eglibc to fulfill libc requirement.
>>>
>>> Symbol: PACKAGE_ldconfig [=n]
>>> Type : tristate
>>> Prompt: ldconfig............................... Shared library path
>>> configuration
>>> Location:
>>> (3) -> Utilities
>>> Defined at tmp/.config-package.in:82365
>>> Depends on: !USE_MUSL [=y]
>>>
>>> If we make python depend on ldconfig, then are we saying python cannot be
>>> used with MUSL libc? I don't know what the default libc is for OpenWRT or
>>> whether one is considered experimental more than the other. But this is
>>> something to consider.
>>>
>>> Thanks,
>>> Andrew
>>>
>>>
>>> On 1/18/17 03:32, 郭涛 wrote:
>>>> Hi Andrew & Alexandru
>>>>
>>>> Forget the patch in prev mail, use attached patch instead.
>>>>
>>>> To use ctypes.util.find_library, you need one of gcc, ldconfig or
>>>> objdump. I suggest you use ldconfig
>>>>
>>>> After install ldconfig, run ldconfig first to update cache
>>>> then run ldconfig -p to show all of your libraries
>>>> in my case, it shows:
>>>>
>>>> 195 libs found in cache `/etc/ld.so.cache' (version 1.7.0)
>>>> uhttpd_tls.so (libc0) => /usr/lib/uhttpd_tls.so
>>>> rclibrary.so (libc0) => /usr/lib/rclibrary.so
>>>> libz.so.1 (libc0) => /usr/lib/libz.so.1
>>>> libz.so (libc0) => /usr/lib/libz.so
>>>> libyaml-0.so.2 (libc0) => /usr/lib/libyaml-0.so.2
>>>> ......
>>>>
>>>> All libraries are libc0, that's why ctypes.util.find_library does not
>>>> work on my platform
>>>>
>>>> You need to run 'uname -m' to get your matchine name and run 'ldconfig
>>>> -p' to get library type.
>>>> Atter all, append '$machine' : '$type' to mach_map list in
>>>> ctypes/util.py and try find_library('pthread')
>>>>
>>>>
>>>>>>> from ctypes.util import find_library
>>>>>>>
>>>>>>> find_library('pthread')
>>>> 'libpthread.so.0'
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> 2017-01-17 22:22 GMT+08:00 Alexandru Ardelean <ardeleanalex at gmail.com>:
>>>>> Will give it a try.
>>>>>
>>>>> On Mon, Jan 16, 2017 at 9:41 PM, Andrew McConachie <andrew at depht.com>
>>>>> wrote:
>>>>>> Hi Alexandru and 郭涛,
>>>>>>
>>>>>> Attached is the Makefile I made for python-iptables. I can work around
>>>>>> this
>>>>>> by hardwiring library locations in the source of python-iptables, but
>>>>>> I'd
>>>>>> rather do it the correct way. To reproduce this build an OpenWrt system
>>>>>> with
>>>>>> this Makefile and then just create a simple Python script with 'import
>>>>>> iptc'.
>>>>>>
>>>>>> I am cloning OpenWrt from Github and running make menuconfig;make to
>>>>>> build
>>>>>> everything. My Github version is about 6 days old with the last commit
>>>>>> at
>>>>>> 5ba298c.
>>>>>>
>>>>>> I also found that /proc/sys/kernel/modprobe contains /sbin/modprobe,
>>>>>> while
>>>>>> the modprobe binary is at /usr/sbin/modprobe. According to the Debian
>>>>>> man
>>>>>> page on proc(5), /proc/sys/kernel/modprobe should point to the modprobe
>>>>>> binary. Googling about seems also to suggest that this file should
>>>>>> contain
>>>>>> the location of the modprobe binary. So I would say this is also a bug.
>>>>>>
>>>>>> Thanks!
>>>>>> --Andrew
>>>>>>
>>>>>>
>>>>>> On 1/16/17 07:23, Alexandru Ardelean wrote:
>>>>>>> Hey Andrew & 郭涛
>>>>>>>
>>>>>>> Sorry I did not answer sooner.
>>>>>>>
>>>>>>> @Andrew: do you have a Makefile for the python-iptables packages ?
>>>>>>> I'd like to try to build it and see the issue. Or, are you just using
>>>>>>> that .py file ?
>>>>>>> Can you give a bit more input on which Python version you're using,
>>>>>>> and which OpenWrt version?
>>>>>>>
>>>>>>> If the issue is still present in the current packages trunk, I'd like
>>>>>>> to
>>>>>>> fix it.
>>>>>>> And if 郭涛's fix works, we can apply it to trunk.
>>>>>>>
>>>>>>> Thanks
>>>>>>> Alex
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Jan 16, 2017 at 6:23 AM, 郭涛 <guotao945 at gmail.com> wrote:
>>>>>>>> I also meet this issue.
>>>>>>>> I fixed it using below change
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> https://github.com/gt945/Netgear-D7800-Openwrt-Packages/commit/fab71ca0ebf36d5f7b495b96f14d459e794b7224
>>>>>>>>
>>>>>>>>
>>>>>>>> 2017-01-13 0:43 GMT+08:00 Andrew McConachie <andrew at depht.com>:
>>>>>>>>> Hi OpenWRT Devs,
>>>>>>>>>
>>>>>>>>> I'm building an OpenWRT package for python-iptables for a project I'm
>>>>>>>>> working on and getting this error message when attempting to use it.
>>>>>>>>>
>>>>>>>>> import iptc
>>>>>>>>> File "/usr/lib/python2.7/site-packages/iptc/__init__.py", line
>>>>>>>>> 10, in
>>>>>>>>> <module>
>>>>>>>>> from ip4tc import (is_table_available, Table, Chain, Rule,
>>>>>>>>> Match,
>>>>>>>>> Target,
>>>>>>>>> File "/usr/lib/python2.7/site-packages/iptc/ip4tc.py", line 13,
>>>>>>>>> in
>>>>>>>>> <module>
>>>>>>>>> from xtables import (XT_INV_PROTO, NFPROTO_IPV4, XTablesError,
>>>>>>>>> xtables,
>>>>>>>>> File "/usr/lib/python2.7/site-packages/iptc/xtables.py", line
>>>>>>>>> 677, in
>>>>>>>>> <module>
>>>>>>>>> _optind = ct.c_long.in_dll(_libc, "optind")
>>>>>>>>> AttributeError: 'NoneType' object has no attribute '_handle'
>>>>>>>>>
>>>>>>>>> You can view xtables.py here if you're curious.
>>>>>>>>> https://github.com/ldx/python-iptables/blob/master/iptc/xtables.py
>>>>>>>>>
>>>>>>>>> The problem is that my python-iptables package cannot find libc
>>>>>>>>> functions
>>>>>>>>> using ctypes.util.find_library(). I've tried building OpenWRT using
>>>>>>>>> both
>>>>>>>>> musl and eglibc but neither work. I've also tried building OpenWRT
>>>>>>>>> with
>>>>>>>>> objdump and ldconfig. When I include ldconfig via 'make menuconfig'
>>>>>>>>> it
>>>>>>>>> doesn't actually populate my OpenWRT image with an ldconfig binary.
>>>>>>>>> Maybe
>>>>>>>>> this is the problem?
>>>>>>>>>
>>>>>>>>> This bug report looks similar to my problem, but it's about MIPS and
>>>>>>>>> marked
>>>>>>>>> as closed.
>>>>>>>>> https://dev.openwrt.org/ticket/20123
>>>>>>>>>
>>>>>>>>> Any help or pointers would be much appreciated.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Andrew
>>>>>>>>> _______________________________________________
>>>>>>>>> openwrt-devel mailing list
>>>>>>>>> openwrt-devel at lists.openwrt.org
>>>>>>>>> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>>>>>>>> _______________________________________________
>>>>>>>> openwrt-devel mailing list
>>>>>>>> openwrt-devel at lists.openwrt.org
>>>>>>>> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>>>>>>
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