[LTP] [PATCH] commands/mkswap01: Update wait_for_file function

[Shuang Qiu <shuang.qiu@oracle.com>]

Hi Stanislav,

Thanks for review.
I agree your comments and will submit another patch.

Thanks
Shuang
On 02/26/2016 09:42 PM, Stanislav Kholmanskikh wrote:
> Hi!
>
> Sorry for my spam in [1], [2]. My brain barely functioned on 
> yesterday's evening. Now I understand that calling blkid is the right 
> choice to check whether a block device exists. :-[
>
> Both blkid, mkswap, swapon use libblkd (and take into account settings 
> in blkid.conf), so if blkid finds the device, then mkswap, swapon will 
> find it as well.
>
>
> On 01/29/2016 06:56 PM, shuang.qiu@oracle.com wrote:
>> From: Shuang Qiu <shuang.qiu@oracle.com>
>>
>> In commit a76b72ad31fa7bb22a09f323dadd5db7c00c7f56,it depends on the 
>> files
>> under /dev/disk/by-* in wait_for_file function.But sometimes udev 
>> does not
>> refresh automatically during runtime and the symbolic links will not 
>> appear.
>> Update the function to use blkid instead.
>
> checkpatch.pl warns about the style of the commit reference.
>
> Maybe add here that blkid (since it uses libblkid as mkswap, swapon 
> does) is sufficient to check the availability of block devices, 
> whereas explicit checking of /dev/disk/by-* should be avoided where 
> possible (man 8 blkid) ?
>
> Plus one more comment below.
>
>>
>> Signed-off-by: Shuang Qiu <shuang.qiu@oracle.com>
>> ---
>>   testcases/commands/mkswap/mkswap01.sh |   25 +++++++++++++------------
>>   1 file changed, 13 insertions(+), 12 deletions(-)
>>
>> diff --git a/testcases/commands/mkswap/mkswap01.sh 
>> b/testcases/commands/mkswap/mkswap01.sh
>> index ae4c98a..fdfc712 100755
>> --- a/testcases/commands/mkswap/mkswap01.sh
>> +++ b/testcases/commands/mkswap/mkswap01.sh
>> @@ -46,25 +46,26 @@ cleanup()
>>       tst_rmdir
>>   }
>>
>> -wait_for_file()
>> +wait_for_device()
>>   {
>> -    local path="$1"
>> +    local token="$1"
>>       local retries=10
>>
>> -    if [ -z "$path" ]; then
>> +    if [ -z "$token" ]; then
>>           return
>>       fi
>>
>>       while [ $retries -gt 0 ]; do
>> -        if [ -e "$path" ]; then
>> +        blkid -t "$token" $TST_DEVICE >/dev/null
>> +        if [ $? -eq 0 ]; then
>>               return
>>           fi
>> -        tst_resm TINFO "Waiting for $path to appear"
>> +        tst_resm TINFO "Waiting for device $token prepared"
>>           retries=$((retries - 1))
>>           tst_sleep 10ms
>>       done
>>
>> -    tst_resm TWARN "The file $path haven't appeared"
>> +    tst_resm TWARN "The device $token haven't prepared"
>
> Since we rely on blkid for device availability checking, maybe change 
> TWARN to TBROK here?
>
>
>>   }
>>
>>   mkswap_verify()
>> @@ -72,7 +73,7 @@ mkswap_verify()
>>       local mkswap_op="$1"
>>       local op_arg="$2"
>>       local swapfile="$3"
>> -    local dev_file="$5"
>> +    local token="$5"
>>
>>       local before=`awk '/SwapTotal/ {print $2}' /proc/meminfo`
>>
>> @@ -84,7 +85,7 @@ mkswap_verify()
>>           local pagesize=$PAGE_SIZE
>>       fi
>>
>> -    wait_for_file "$dev_file"
>> +    wait_for_device "$token"
>>
>>       swapon $swapfile 2>/dev/null
>>
>> @@ -138,7 +139,7 @@ mkswap_test()
>>       local op_arg="$2"
>>       local device="$3"
>>       local size="$4"
>> -    local dev_file="$5"
>> +    local token="$5"
>>
>>       local mkswap_cmd="mkswap $mkswap_op $op_arg $TST_DEVICE $size"
>>
>> @@ -156,7 +157,7 @@ mkswap_test()
>>       fi
>>
>>       if [ -n "$device" ]; then
>> -        mkswap_verify "$mkswap_op" "$op_arg" "$device" "$size" 
>> "$dev_file"
>> +        mkswap_verify "$mkswap_op" "$op_arg" "$device" "$size" "$token"
>>           if [ $? -ne 0 ]; then
>>               tst_resm TFAIL "'${mkswap_cmd}' failed, not expected."
>>               return
>> @@ -173,9 +174,9 @@ mkswap_test "" "" "$TST_DEVICE" 
>> "$((DEVICE_SIZE-10000))"
>>   mkswap_test "-f" "" "$TST_DEVICE" "$((DEVICE_SIZE+10000))"
>>   mkswap_test "-c" "" "$TST_DEVICE"
>>   mkswap_test "-p" "2048" "$TST_DEVICE"
>> -mkswap_test "-L" "ltp_testswap" "-L ltp_testswap" "" 
>> "/dev/disk/by-label/ltp_testswap"
>> +mkswap_test "-L" "ltp_testswap" "-L ltp_testswap" "" 
>> "LABEL=ltp_testswap"
>>   mkswap_test "-v1" "" "$TST_DEVICE"
>> -mkswap_test "-U" "$UUID" "-U $UUID" "" "/dev/disk/by-uuid/$UUID"
>> +mkswap_test "-U" "$UUID" "-U $UUID" "" "UUID=$UUID"
>>   mkswap_test "-V"
>>   mkswap_test "-h"
>>
>>