On 10/1/2020 6:22 AM, Mario Emmenlauer wrote:
On 22.09.20 22:14, Mario Emmenlauer wrote:
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 scripts.
Is there something I should do about this issue? I could look into the
source code of `test` on Cygwin if someone can point me to the correct
repository? Or should I just file an issue?
There is no special source code of 'test' on Cygwin. Assuming you're working in
a bash shell, 'test' is a shell builtin, so the source code is part of the
source code of bash. (I don't know if other shells have a 'test' builtin.)
Alternatively, if you're running /usr/bin/test.exe, then it's part of the
coreutils package.
Either way, looking at that source code is not likely to help, except to see
what system call it uses to test the access.
The issue is not a super high priority for me personally, but I guess
its quite a limitation of Cygwin if essential scripting functionality
is misbehaving on NFS.
I don't know anything about NFS, but I doubt if this is a general problem with
NFS on Cygwin. There's quite a bit of Cygwin code devoted to NFS shares, and
the question is why this isn't working for yours.
Corinna is probably the only person who knows what questions to ask you to get
to the bottom of this, and she's currently unavailable. When she returns, maybe
she can help.
Ken
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