From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from forward106j.mail.yandex.net (forward106j.mail.yandex.net [IPv6:2a02:6b8:0:801:2::109]) by sourceware.org (Postfix) with ESMTPS id B9DB1395441A for ; Tue, 6 Oct 2020 15:50:03 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org B9DB1395441A Received: from mxback27j.mail.yandex.net (mxback27j.mail.yandex.net [IPv6:2a02:6b8:0:1619::227]) by forward106j.mail.yandex.net (Yandex) with ESMTP id 8140411A00EE; Tue, 6 Oct 2020 18:50:01 +0300 (MSK) Received: from iva7-f62245f79210.qloud-c.yandex.net (iva7-f62245f79210.qloud-c.yandex.net [2a02:6b8:c0c:2e83:0:640:f622:45f7]) by mxback27j.mail.yandex.net (mxback/Yandex) with ESMTP id axLIjrimpz-o15Sevtm; Tue, 06 Oct 2020 18:50:01 +0300 Received: by iva7-f62245f79210.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id qjh3UyBvCY-o0mKNDWY; Tue, 06 Oct 2020 18:50:00 +0300 (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (Client certificate not present) Received: from [192.168.1.10] (HELO daemon2.darkdragon.lan) by daemon2 (Office Mail Server 0.8.12 build 08053101) with SMTP; Tue, 06 Oct 2020 15:46:06 -0000 Date: Tue, 6 Oct 2020 18:46:06 +0300 From: Andrey Repin X-Mailer: The Bat! (v6.8.8) Home Reply-To: cygwin@cygwin.com X-Priority: 3 (Normal) Message-ID: <1279009444.20201006184606@yandex.ru> To: Mario Emmenlauer , cygwin@cygwin.com Subject: Re: test -r or -x always return false on an NFS mount? In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_THEBAT, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Oct 2020 15:50:06 -0000 Greetings, Mario Emmenlauer! > thanks for the awesome Cygwin, its really great! > But since today I met a problem: I mounted a Linux NFSv3 share using > the Windows 10 shipped NFS client. The user and group ID are mapped > via registry settings AnonymousUid and AnonymousGid in the entry > HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ClientForNFS\CurrentVersion\Default > Everything seems to work quite well, and in `ls -la` I can see the > file permissions and user and group entries. But when using `test` > to check for read (`test -r`) or execute permissions (`test -x`), it > always returns false, even for readable files. `ls` on the other hand > shows the permissions correctly, and `cat`ing the files works without > problems. > I've read https://cygwin.com/cygwin-ug-net/using-filemodes.html > about the Cygwin file permissions for NFS, and also the NFS account > mapping at https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping-nfs, > but as far as I can see, they are both unrelated. Google turned up no > useful hits for keywords "cygwin" "test" and "nfs", so I'm a bit at the > end of my wit. > Is this a known issue, and/or are there any workarounds? I'm currently > using `test -e` in place of read or execute checks, but it basically > breaks all my build scrips. This is a known issue. For years known. test only guess -r/-w/-x results based on permissions as it sees them. But it do not actually try to read/write/execute the subject, which, as you can imagine, may lead to all sorts of false positives/negatives on filesystems with less than trivial access control setups. In other words, don't test for rwx if you can avoid it. The results MAY be wrong. -- With best regards, Andrey Repin Tuesday, October 6, 2020 18:42:12 Sorry for my terrible english...