ls -l on Android device

[Tom Spear]

Hi, sorry, I've been really busy the last week and have not had a
chance to test anything yet, but I will get an answer to you tomorrow
evening at the latest.

Thanks

Tom



On Sat, Jan 30, 2010 at 8:32 AM, Denys Vlasenko
<vda.linux at googlemail.com> wrote:
> Hi Tom,
>
> Any news on this?
>
> On Thu, Jan 28, 2010 at 12:30 AM, Denys Vlasenko
> <vda.linux at googlemail.com> wrote:
>> On Sunday 24 January 2010 11:46, Tom Spear wrote:
>>> On Wed, Jan 13, 2010 at 12:15 AM, Tom Spear <speeddymon at gmail.com> wrote:
>>> > Ok. I'll try it this weekend. I don't think I'll have time before then
>>> > unfortunately. :-(
>>>
>>> I was finally able to get this done. I had to comment the pw_gecos
>>> call to get it to compile:
>>>
>>> [tom at Speeddy testapp]$ agcc -o test test.c
>>> test.c: In function 'dump':
>>> test.c:15: error: 'struct passwd' has no member named 'pw_gecos'
>>>
>>> But once I did that, it compiled fine, output is below:
>>>
>>> [tom at Speeddy testapp]$ adb shell
>>> # /system/bin/test 2000 shell
>>> pw_name:shell
>>> pw_passwd:(null)
>>> pw_uid:2000
>>> pw_gid:2000
>>> pw_dir:/
>>> pw_shell:/system/bin/sh
>>>
>>> pw_name:shell
>>> pw_passwd:(null)
>>> pw_uid:2000
>>> pw_gid:2000
>>> pw_dir:/
>>> pw_shell:/system/bin/sh
>>>
>>> # /system/bin/test 0 root
>>> pw_name:root
>>> pw_passwd:(null)
>>> pw_uid:0
>>> pw_gid:0
>>> pw_dir:/
>>> pw_shell:/system/bin/sh
>>>
>>> pw_name:root
>>> pw_passwd:(null)
>>> pw_uid:0
>>> pw_gid:0
>>> pw_dir:/
>>> pw_shell:/system/bin/sh
>>>
>>>
>>> It looks like it all works fine, so I am unsure why the calls don't
>>> return the name associated with the uid/gid.
>>
>> Ok. Let's dig deeper. Earlier you said that busybox id gives this:
>>
>> $ ./busybox id
>> uid=2000 gid=2000 groups=1003,1004,1007,1011,1015,3001,3002,3003
>>
>> Looking at the source, "id" with no parameters ends up here
>> in id.c:
>>
>> static int print_group(gid_t id, const char *prefix)
>> {
>>        return print_common(id, gid2group(id), prefix);
>> }
>>
>> static int print_user(uid_t id, const char *prefix)
>> {
>>        return print_common(id, uid2uname(id), prefix);
>> }
>>
>> Let's follow uid2uname: it's in libbb/bb_pwd.c:
>>
>> char* FAST_FUNC uid2uname(uid_t uid)
>> {
>>        struct passwd *pw = getpwuid(uid);
>>        return (pw) ? pw->pw_name : NULL;
>> }
>>
>> As you see, it uses the very same getpwuid() call.
>> Please instrument it by adding this line:
>>
>>        struct passwd *pw = getpwuid(uid);
>> bb_error_msg("getpwuid(%d):%p", (int)uid, pw);
>>        return (pw) ? pw->pw_name : NULL;
>>
>> recompile busybox, making sure CONFIG_USE_BB_PWD_GRP
>> and CONFIG_USE_BB_SHADOW are off, then re-run
>> "./busybox id". What does it print? Give the same uid to
>> "/system/bin/test <UID> root" - does it resolve it?
>> --
>> vda>
>