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From:	=?UTF-8?Q?Bj=C3=B6rn_Kautler?= <Bjoern AT kautler DOT net>
Date:	Mon, 22 Aug 2016 09:59:37 +0200
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Subject:	Re: Wrong file permissions
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Hi Eliot,

thanks for your answer.

It seems this was an issue with the NTFS permissions.
I also was not able to access the folders via Windows Explorer.
After also fixing the Windows permissions it works now as expected so far.

Do you really think I got a new SID on the new box when logging in
with the same user of the same domain?
Can I check this somehow?

Why should the setup be redone on a new box?
I'd need to do redo all installations, configuration, and so on.
Besides ths permsissions issue I had, why shouldn't I just copy over
the whole cygwin root directory?
Everything cygwin related should be in there, isn't it?

Regards
Björn


2016-08-19 16:17 GMT+02:00 Eliot Moss <moss AT cs DOT umass DOT edu>:
> On 8/19/2016 8:27 AM, Björn Kautler wrote:
>>
>> Hi,
>>
>> I have a problem I hope you can help me to solve.
>> I switched to a new box at work and copied over my whole cygwin folder via
>> rsync from the old box to the new one.
>> But now if I do "touch tmp", the file gets 060 permissions and not 644
>> like
>> before.
>> This is very disturbing, as not even "cat <<<foo" works but errors out
>> with
>> "bash: cannot create temp file for here-document: Permission denied".
>>
>> I hope you can help me with this one.
>
>
> First, I suspect that Corinna, et al., will be interested in the output
> of icacls applied to a file/folder in question, and possibly cygcheck
> output.  Second, rsync'ing your stuff over probably does not respect
> that you almost certainly have a new Windows SID on your new box.  You
> probably need to change over ownership.  And any group(s) you assigned
> probably did not carry over either.  Yeah, it's a pain moving to a new
> box.  I suspect others on the list will have suggestions as to best
> procedure to follow when moving over.
>
> In any case, this suggests using Windows commands (manipulation from
> a File Explorer opened with admin privileges) to insure that all your
> files have the right owner, and (if you follow my scheme mentioned
> below) to add a new group to the files (that can also be done using
> a recursive chgrp once things are in a state to allow it).
>
> For my part, I have found it helpful (or to my taste anyway) to create
> a new group, distinct from my user identity.  (Windows typically kind
> of conflates the two, i.e., each user *is* a group, and that group is
> typically the primary group of files for which you are the primary
> user / creator.)  I then chgrp all my Cygwin files to that group, and
> also set folders to propagate their group to newly created files
> (g+s, or 2000, permission on directories).  For my backup programs
> to work I also set for all files/folders to have read access by
> SYSTEM and for that to propagate from folders.  For files created by
> Windows programs I still sometimes need to adjust their group manually
> (sigh).
>
> I hope this hasn't been too terse for you to get some useful guidance.
>
> Cygwin community: Do we have guidance in the FAQ about moving a Cygwin
> installation to a new box?  (I mean the user's files, not the install
> done by setup -- which (IMO) should be redone on a new box, not copied.)
>
> Regards -- Eliot Moss
>
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