On Fri, Sep 1, 2017 at 10:04 AM, Eryu Guan <eguan@xxxxxxxxxx> wrote:
> On Fri, Sep 01, 2017 at 02:39:44PM +0900, Misono, Tomohiro wrote:
>> Several tests uses both _filter_test_dir and _filter_scratch
>> concatenated by pipe to filter $TEST_DIR and $SCRATCH_MNT. However, this
>> would fail if the shorter string is a substring of the other (like
>> "/mnt" and "/mnt2").
>>
>> This patch introduces new common filter function to safely call both
>> _filter_test_dir and _filter_scratch.
>>
>> I chedked this with btrfs/029, generic/409,410,411, and generic/381,383,
>> xfs/106,108 (which calls _filter_quota). Thanks Eryu for advice.
>>
>> Signed-off-by: Tomohiro Misono <misono.tomohiro@xxxxxxxxxxxxxx>
>
> Thanks! Though I don't think we need two separate patches, so I merged
> the two patches together at commit time.
>
FYI, there is still a way for a creative user to mess this up:
TEST_DEV=/test
TEST_DIR=/test/ovl-mnt
SCRATCH_DEV=/ovl
SCRATCH_MNT=/ovl/ovl-mnt
$SCRATCH_DEV is a substring of $TEST_DIR
and _filter_scratch is run first.
It's not that crazy to get to this config with the 'new'
-overlay command, e.g.:
TEST_DEV=/dev/sda
TEST_DIR=/test
SCRATCH_DEV=/dev/sdb
SCRATCH_MNT=/ovl
Will be auto converted to the values above.
This patch didn't break this use case.
>> ---
>> common/filter | 11 +++++++++++
>> 1 file changed, 11 insertions(+)
>>
>> diff --git a/common/filter b/common/filter
>> index 1ef342b..75570f9 100644
>> --- a/common/filter
>> +++ b/common/filter
>> @@ -295,6 +295,17 @@ _filter_scratch()
>> -e "/.use_space/d"
>> }
>>
>> +_filter_testdir_and_scratch()
>> +{
>> + # filter both $TEST_DIR and $SCRATCH_MNT, but always filter the longer
>> + # string first if the other string is a substring of the first one
>> + if echo "$TEST_DIR" | grep -q "$SCRATCH_MNT"; then
>> + _filter_test_dir | _filter_scratch
>> + else
>> + _filter_scratch | _filter_test_dir
>
> And fixed the indention here, used tab :)
>
> Thanks,
> Eryu
>
>> + fi
>> +}
>> +
>> # Turn any device in the scratch pool into SCRATCH_DEV
>> _filter_scratch_pool()
>> {
>> --
>> 2.9.5
>>
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