Oh, You are right, I understood it wrong. Thanks for reminding.
在 2019/9/25 11:15, Eryu Guan 写道:
> On Tue, Sep 24, 2019 at 10:19:38PM +0800, Zhihao Cheng wrote:
>> As far as I know, _require_scratch_shutdown() is called after _overay_config_override(), at this moment, FSTYP equals to base fs. According the implementation of _require_scratch_shutdown:
>> 3090 _require_scratch_shutdown()
>> 3091 {
>> 3092 [ -x src/godown ] || _notrun "src/godown executable not found"
>> 3093
>> 3094 _scratch_mkfs > /dev/null 2>&1 || _notrun "_scratch_mkfs failed on $SCRATCH_DEV"
>> 3095 _scratch_mount
>> 3096
>> 3097 if [ $FSTYP = "overlay" ]; then # FSTYP = base fs
>> 3098 if [ -z $OVL_BASE_SCRATCH_DEV ]; then
>> 3099 # In lagacy overlay usage, it may specify directory as
>> 3100 # SCRATCH_DEV, in this case OVL_BASE_SCRATCH_DEV
>> 3101 # will be null, so check OVL_BASE_SCRATCH_DEV before
>> 3102 # running shutdown to avoid shutting down base fs accidently.
>> 3103 _notrun "$SCRATCH_DEV is not a block device"
>> 3104 else
>> 3105 src/godown -f $OVL_BASE_SCRATCH_MNT 2>&1 \
>> 3106 || _notrun "Underlying filesystem does not support shutdown"
>> 3107 fi
>> 3108 else
>> 3109 src/godown -f $SCRATCH_MNT 2>&1 \
>> 3110 || _notrun "$FSTYP does not support shutdown" # Executes this path
>> 3111 fi
>> 3112
>> 3113 _scratch_unmount
>> 3114 }
>> So, we can't get output: _notrun "$SCRATCH_DEV is not a block device". Instead, the verbose should like:
>> after _overlay_config_override FSTYP=ubifs # Additional print message
>> FSTYP -- ubifs
>> PLATFORM -- Linux/x86_64
>> MKFS_OPTIONS -- /dev/ubi0_1
>> MOUNT_OPTIONS -- -t ubifs /dev/ubi0_1 /tmp/scratch
>>
>> generic/042 [not run] ubifs does not support shutdown
>>
>> But I'll consider describing error more concisely in v2.
>>
>> 在 2019/9/24 20:33, Amir Goldstein 写道:
>>> On Tue, Sep 24, 2019 at 12:34 PM Zhihao Cheng <chengzhihao1@xxxxxxxxxx> wrote:
>>>>
>>>> When running overlay tests using character devices as base fs partitions,
>>>> all overlay usecase results become 'notrun'. Function
>>>> '_overay_config_override' (common/config) detects that the current base
>>>> fs partition is not a block device and will set FSTYP to base fs. The
>>>> overlay usecase will check the current FSTYP, and if it is not 'overlay'
>>>> or 'generic', it will skip the execution.
>>>>
>>>> For example, using UBIFS as base fs skips all overlay usecases:
>>>>
>>>> FSTYP -- ubifs # FSTYP should be overridden as 'overlay'
>>>> MKFS_OPTIONS -- /dev/ubi0_1 # Character device
>>>> MOUNT_OPTIONS -- -t ubifs /dev/ubi0_1 /tmp/scratch
>>>>
>>>> overlay/001 [not run] not suitable for this filesystem type: ubifs
>>>> overlay/002 [not run] not suitable for this filesystem type: ubifs
>>>> overlay/003 [not run] not suitable for this filesystem type: ubifs
>>>> ...
>>>>
>>>> When checking that the base fs partition is a block/character device,
>>>> FSTYP is overwritten as 'overlay'. This patch allows the base fs
>>>> partition to be a character device that can also execute overlay
>>>> usecases (such as ubifs).
>>>>
>>>> Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
>>>> ---
>>>> common/config | 4 ++--
>>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/common/config b/common/config
>>>> index 4c86a49..a22acdb 100644
>>>> --- a/common/config
>>>> +++ b/common/config
>>>> @@ -550,7 +550,7 @@ _overlay_config_override()
>>>> # the new OVL_BASE_SCRATCH/TEST_DEV/MNT vars are set to the values
>>>> # of the configured base fs and SCRATCH/TEST_DEV vars are set to the
>>>> # overlayfs base and mount dirs inside base fs mount.
>>>> - [ -b "$TEST_DEV" ] || return 0
>>>> + [ -b "$TEST_DEV" ] || [ -c "$TEST_DEV" ] || return 0
>>>>
>>>> # Config file may specify base fs type, but we obay -overlay flag
>>>> [ "$FSTYP" == overlay ] || export OVL_BASE_FSTYP="$FSTYP"
>>>> @@ -570,7 +570,7 @@ _overlay_config_override()
>>>> export TEST_DIR="$OVL_BASE_TEST_DIR/$OVL_MNT"
>>>> export MOUNT_OPTIONS="$OVERLAY_MOUNT_OPTIONS"
>>>>
>>>> - [ -b "$SCRATCH_DEV" ] || return 0
>>>> + [ -b "$SCRATCH_DEV" ] || [ -c "$SCRATCH_DEV" ] || return 0
>>>>
>>>> # Store original base fs vars
>>>> export OVL_BASE_SCRATCH_DEV="$SCRATCH_DEV"
>>>> --
>>>> 2.7.4
>>>>
>>>
>>> Looks fine.
>>>
>>> One nit: there is a message in _require_scratch_shutdown():
>>> _notrun "$SCRATCH_DEV is not a block device"
>>> for when $OVL_BASE_SCRATCH_DEV is not defined.
>>>
>>> Could probably use a better describing error anyway.
>
> I think what Amir suggested is that, as you add char device support to
> overlay base device, the message in _require_scratch_shutdown() should
> be updated accordingly, not the commit log.
>
> Thanks,
> Eryu
>
> .
>
