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From: Max Reitz <mreitz@redhat.com>
To: Eric Blake <eblake@redhat.com>, qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Thomas Huth <thuth@redhat.com>,
	qemu-devel@nongnu.org
Subject: Re: [PATCH 01/23] iotests: Introduce $SOCK_DIR
Date: Fri, 11 Oct 2019 09:51:50 +0200
Message-ID: <de01a842-4418-c3f4-7521-d11ae10d2866@redhat.com> (raw)
In-Reply-To: <28d6c3e1-7efa-7e31-0b95-c8b5c79f75dc@redhat.com>

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On 10.10.19 20:18, Eric Blake wrote:
> On 10/10/19 10:24 AM, Max Reitz wrote:
>> Unix sockets generally have a maximum path length.  Depending on your
>> $TEST_DIR, it may be exceeded and then all tests that create and use
>> Unix sockets there may fail.
>>
>> Circumvent this by adding a new scratch directory specifically for
>> Unix socket files.  It defaults to a temporary directory (mktemp -d)
>> that is completely removed after the iotests are done.
>>
>> (By default, mktemp -d creates a /tmp/tmp.XXXXXXXXXX directory, which
>> should be short enough for our use cases.)
>>
>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>> ---
>>   tests/qemu-iotests/check | 17 +++++++++++++++++
> 
>> +tmp_sock_dir=false
>> +if [ -z "$SOCK_DIR" ]; then
>> +    SOCK_DIR=$(mktemp -d)
>> +    tmp_sock_dir=true
>> +fi
>> +
>> +if [ ! -d "$SOCK_DIR" ]; then
>> +    mkdir "$SOCK_DIR"
>> +fi
> 
> Should this use mkdir -p, in case two parallel processes compete with
> the same SOCK_DIR?

I would have used mkdir -p, but I saw we used this construct for
TEST_DIR, so I thought I‘d just go for the same.

> What if SOCK_DIR is set to something that is not a directory (say a
> file), at which point mkdir fails, but you don't seem to be catching
> that failure.

Well, the same applies to TEST_DIR.  And technically, as long as we
don’t use mkdir -p for either, not catching the error at least helps
circumvent the potential race. O:-)

(I’ll convert both to mkdir -p with error handling.)

Max

> Otherwise looks good.



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  reply index

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 15:24 [PATCH 00/23] iotests: Add and use $SOCK_DIR Max Reitz
2019-10-10 15:24 ` [PATCH 01/23] iotests: Introduce $SOCK_DIR Max Reitz
2019-10-10 18:18   ` Eric Blake
2019-10-11  7:51     ` Max Reitz [this message]
2019-10-10 15:24 ` [PATCH 02/23] iotests.py: Store socket files in $SOCK_DIR Max Reitz
2019-10-10 18:36   ` Eric Blake
2019-10-11  7:21   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 03/23] iotests.py: Add @base_dir to FilePaths etc Max Reitz
2019-10-10 18:40   ` Eric Blake
2019-10-10 15:24 ` [PATCH 04/23] iotests: Filter $SOCK_DIR Max Reitz
2019-10-10 18:42   ` Eric Blake
2019-10-11  7:54     ` Max Reitz
2019-10-11  7:57       ` Thomas Huth
2019-10-10 19:50   ` Eric Blake
2019-10-11  7:57     ` Max Reitz
2019-10-10 15:24 ` [PATCH 05/23] iotests: Let common.nbd create socket in $SOCK_DIR Max Reitz
2019-10-10 18:59   ` Eric Blake
2019-10-10 15:24 ` [PATCH 06/23] iotests/083: Create " Max Reitz
2019-10-10 19:03   ` Eric Blake
2019-10-11  7:31   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 07/23] iotests/140: " Max Reitz
2019-10-10 19:05   ` Eric Blake
2019-10-11  7:34   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 08/23] iotests/143: " Max Reitz
2019-10-10 19:23   ` Eric Blake
2019-10-11  7:35   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 09/23] iotests/147: " Max Reitz
2019-10-10 19:23   ` Eric Blake
2019-10-11  7:36   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 10/23] iotests/181: " Max Reitz
2019-10-10 19:24   ` Eric Blake
2019-10-11  7:38   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 11/23] iotests/182: " Max Reitz
2019-10-10 19:24   ` Eric Blake
2019-10-11  7:38   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 12/23] iotests/183: " Max Reitz
2019-10-10 19:28   ` Eric Blake
2019-10-11  7:42   ` Thomas Huth
2019-10-10 15:24 ` [PATCH 13/23] iotests/192: " Max Reitz
2019-10-10 19:28   ` Eric Blake
2019-10-10 15:24 ` [PATCH 14/23] iotests/194: Create sockets " Max Reitz
2019-10-10 19:32   ` Eric Blake
2019-10-10 19:43   ` Eric Blake
2019-10-11  7:55     ` Max Reitz
2019-10-10 15:24 ` [PATCH 15/23] iotests/201: Create socket " Max Reitz
2019-10-10 19:39   ` Eric Blake
2019-10-10 15:24 ` [PATCH 16/23] iotests/205: " Max Reitz
2019-10-10 19:40   ` Eric Blake
2019-10-10 15:24 ` [PATCH 17/23] iotests/208: " Max Reitz
2019-10-10 19:41   ` Eric Blake
2019-10-10 15:24 ` [PATCH 18/23] iotests/209: " Max Reitz
2019-10-10 19:44   ` Eric Blake
2019-10-10 15:24 ` [PATCH 19/23] iotests/222: " Max Reitz
2019-10-10 19:45   ` Eric Blake
2019-10-10 15:24 ` [PATCH 20/23] iotests/223: " Max Reitz
2019-10-10 19:46   ` Eric Blake
2019-10-10 15:24 ` [PATCH 21/23] iotests/240: " Max Reitz
2019-10-10 19:46   ` Eric Blake
2019-10-10 15:24 ` [PATCH 22/23] iotests/267: " Max Reitz
2019-10-10 19:47   ` Eric Blake
2019-10-10 15:24 ` [PATCH 23/23] iotests: Drop TEST_DIR filter from _filter_nbd Max Reitz
2019-10-10 19:51   ` Eric Blake
2019-10-11  7:27 ` [PATCH 00/23] iotests: Add and use $SOCK_DIR Thomas Huth
2019-10-11  8:03   ` Max Reitz
2019-10-11  8:13     ` Thomas Huth
2019-10-11  8:54   ` Max Reitz

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