linux-kernel - Re: [PATCH xfstests] generic/192: Move 'cd /' to the place where the program exits

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Date:   Mon, 14 Oct 2019 10:26:04 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     Eryu Guan <guaneryu@...il.com>
CC:     <darrick.wong@...cle.com>, <ebiggers@...gle.com>,
        <yi.zhang@...wei.com>, <fstests@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH xfstests] generic/192: Move 'cd /' to the place where the
 program exits

I agree with your proposal. Indeed, '$here' is referenced in other places where executable files under src are used, including '$here/src/feature', '$here/src/seek_sanity_test', etc.
I have a question about why many test cases execute 'cd /' before the end. For example, generic/124, generic/122, generic/003. I wonder the intention of operation 'cd /'.

在 2019/10/13 20:46, Eryu Guan 写道:
> On Wed, Oct 09, 2019 at 04:27:57PM +0800, Zhihao Cheng wrote:
>> Running generic/192 with overlayfs(Let ubifs as base fs) yields the
>> following output:
>>
>>   generic/192 - output mismatch
>>      QA output created by 192
>>      sleep for 5 seconds
>>      test
>>     +./common/rc: line 316: src/t_dir_type: No such file or directory
>>      delta1 is in range
>>      delta2 is in range
>>     ...
>>
>> When the use case fails, the call stack in generic/192 is:
>>
>>   local unknowns=$(src/t_dir_type $dir u | wc -l)	common/rc:316
>>   _supports_filetype					common/rc:299
>>   _overlay_mount					common/overlay:52
>>   _overlay_test_mount					common/overlay:93
>>   _test_mount						common/rc:407
>>   _test_cycle_mount					generic/192:50
>>
>> Before _test_cycle_mount() being invoked, generic/192 executed 'cd /'
>> to change work dir from 'xfstests-dev' to '/', so src/t_dir_type was not
>> found.
>>
>> Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
> 
> Thanks for the debug! But I think the right fix is to call t_dir_type
> via "$here", i.e.
> 
> 	local unknowns=$($here/src/t_dir_type $dir u | wc -l)
> 
> 'here', which points to the top level dir of xfstests source code, is
> defined in every test in test setup, and is guaranteed not to be empty.
> 
> Thanks,
> Eryu
> 
>> ---
>>  tests/generic/192 | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/tests/generic/192 b/tests/generic/192
>> index 50b3d6fd..5550f39e 100755
>> --- a/tests/generic/192
>> +++ b/tests/generic/192
>> @@ -15,7 +15,12 @@ echo "QA output created by $seq"
>>  here=`pwd`
>>  tmp=/tmp/$$
>>  status=1	# failure is the default!
>> -trap "exit \$status" 0 1 2 3 15
>> +trap "_cleanup; exit \$status" 0 1 2 3 15
>> +
>> +_cleanup()
>> +{
>> +	cd /
>> +}
>>  
>>  _access_time()
>>  {
>> @@ -46,7 +51,6 @@ sleep $delay # sleep to allow time to move on for access
>>  cat $testfile
>>  time2=`_access_time $testfile | tee -a $seqres.full`
>>  
>> -cd /
>>  _test_cycle_mount
>>  time3=`_access_time $testfile | tee -a $seqres.full`
>>  
>> -- 
>> 2.13.6
>>
> 
> .
>