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List: unison-users
Subject: Re: [unison-users] Weird permissions on created files/directories with perms=0/dontchmod
From: "worley () alum ! mit ! edu [unison-users]" <unison-users () yahoogroups ! com>
Date: 2014-05-19 19:49:24
Message-ID: 201405191949.s4JJnOL1005451 () hobgoblin ! ariadne ! com
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> From: "worley@alum.mit.edu [unison-users]" <unison-users@yahoogroups.com>
> On May 8, 2014, at 6:08 AM, mbuck472082@yahoo.com wrote:
>
> > On a side note, it would be useful to be able to influence the
> > umask of the unison server started remotely via ssh. Currently I'm
> > using a wrapper which first sets the umask and then runs "unison
> > -server", but it would be better if one could configure this in
> > the Unison profile.
>
> It might be possible to use "-servercmd 'umask 066 ; unison'". But
> you're right, it makes sense to have a "umask xxx" preference.
I was wondering about exactly how permissions were handled, especially
if a new file is replicated from a Unix to a Windows system or
vice-versa. It turns out that it is in the manual:
http://www.cis.upenn.edu/~bcpierce/unison/download/releases/stable/unison-manual.html#perms
Permissions
Synchronizing the permission bits of files is slightly tricky when two
different filesytems are involved (e.g., when synchronizing a Windows
client and a Unix server). In detail, here's how it works:
* When the permission bits of an existing file or directory are
changed, the values of those bits that make sense on both
operating systems will be propagated to the other replica. The
other bits will not be changed.
* When a newly created file is propagated to a remote replica, the
permission bits that make sense in both operating systems are
also propagated. The values of the other bits are set to default
values (they are taken from the current umask, if the receiving
host is a Unix system).
* For security reasons, the Unix setuid and setgid bits are not
propagated.
* The Unix owner and group ids are not propagated. (What would
this mean, in general?) All files are created with the owner and
group of the server process.
Which suggests that a direct way to set the umask of a remote Unison
server would be useful.
Getting back to the OP's problem:
> I'm trying to sync between Windows and Linux (with ssh from Windows
> to Linux) using Unison 2.40.65. Everything works fine except for the
> permissions of files/directories created on the Linux
> side. Directories always seem to get 0777 (masked by umask), which
> is fine, but files are created with permissions 0600 (again masked
> by umask).
It appears from the documentation that the file should be created on
Linux with "default" permissions (0777) masked by umask, since there
are no permission bits that make sense in both operating systems.
Dale
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<p>> From: "worley@alum.mit.edu [unison-users]" \
<unison-users@yahoogroups.com><br> <br>
> On May 8, 2014, at 6:08 AM, mbuck472082@yahoo.com wrote:<br>
> <br>
> > On a side note, it would be useful to be able to influence the<br>
> > umask of the unison server started remotely via ssh. Currently I'm<br>
> > using a wrapper which first sets the umask and then runs "unison<br>
> > -server", but it would be better if one could configure this in<br>
> > the Unison profile.<br>
> <br>
> It might be possible to use "-servercmd 'umask 066 ; unison'". \
But<br> > you're right, it makes sense to have a "umask xxx" \
preference.<br> <br>
I was wondering about exactly how permissions were handled, especially<br>
if a new file is replicated from a Unix to a Windows system or<br>
vice-versa. It turns out that it is in the manual:<br>
<br>
http://www.cis.upenn.edu/~bcpierce/unison/download/releases/stable/unison-manual.html#perms<br>
<br>
Permissions<br>
<br>
Synchronizing the permission bits of files is slightly tricky when two<br>
different filesytems are involved (e.g., when synchronizing a Windows<br>
client and a Unix server). In detail, here's how it works:<br>
<br>
* When the permission bits of an existing file or directory are<br>
changed, the values of those bits that make sense on both<br>
operating systems will be propagated to the other replica. The<br>
other bits will not be changed.<br>
<br>
* When a newly created file is propagated to a remote replica, the<br>
permission bits that make sense in both operating systems are<br>
also propagated. The values of the other bits are set to default<br>
values (they are taken from the current umask, if the receiving<br>
host is a Unix system).<br>
<br>
* For security reasons, the Unix setuid and setgid bits are not<br>
propagated.<br>
<br>
* The Unix owner and group ids are not propagated. (What would<br>
this mean, in general?) All files are created with the owner and<br>
group of the server process. <br>
<br>
Which suggests that a direct way to set the umask of a remote Unison<br>
server would be useful.<br>
<br>
Getting back to the OP's problem:<br>
<br>
> I'm trying to sync between Windows and Linux (with ssh from Windows<br>
> to Linux) using Unison 2.40.65. Everything works fine except for the<br>
> permissions of files/directories created on the Linux<br>
> side. Directories always seem to get 0777 (masked by umask), which<br>
> is fine, but files are created with permissions 0600 (again masked<br>
> by umask).<br>
<br>
It appears from the documentation that the file should be created on<br>
Linux with "default" permissions (0777) masked by umask, since there<br>
are no permission bits that make sense in both operating systems.<br>
<br>
Dale<br>
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