Cygwin making files inaccessible?
Mon Feb 7 07:01:33 GMT 2022
Greetings, Jay K!
> I looked at this a while. I tried various recent cygwin1.dlls as there were two ACL changes recently.
> I tried building cygwin1.dll with those changes reverted, but failed to build it.
> For one thing it took me a while to find shilka..it is in cocom, but that wasn't the entire problem.
> Eventually.. I noticed the behavior was not the same for every
> file/directory/volume. Sometimes it worked ok.
> Though I think the ACLs still get changed quite a bit: "full" expands to "many".
> Of course it has worked plenty for me and everyone else.
> Eventually I tried chmod -R 777 * and this seems to have worked.
> I speculate that some "bad" Cygwin ACLs got created at some point.
> And maybe cacls wasn't deleting them?? That parts seems wierd. Maybe on directories?
> Possibly due to those two recent changes, or maybe user error, I don't know.
This may happen outside Cygwin tree, when initial ACL's are set in some
One possible solution is to tweak /cygdrive mount point to include "noacl"
flag, deferring all ACL modifications to Windows.
(Please bottom post in this list. Thank you.)
> From: Jay K
> Sent: Saturday, February 5, 2022 12:16 PM
> To: email@example.com <firstname.lastname@example.org>
> Subject: Cygwin making files inaccessible?
> Cygwin making files inaccessible?
> i.e. when Cygwin copies or writes to them, not random files.
> C:\t>dir /s/b/a
> C:\t>dir /q .
> 02/05/2022 04:11 AM <DIR> BUILTIN\Administrators .
> 02/05/2022 04:11 AM <DIR> NT SERVICE\TrustedInsta..
> C:\t>cacls .
> C:\t Everyone:(OI)(CI)F
> C:\t>echo > 1.txt
> C:\t>cacls 1.txt
> C:\t\1.txt Everyone:F
> C:\t>copy 1.txt 2.txt
> 1 file(s) copied.
> C:\t>cacls 2.txt
> C:\t\2.txt Everyone:F
> C:\t>del 2.txt
> C:\t>uname -a
> CYGWIN_NT-10.0-WOW DESKTOP-BCFUMJ4 3.3.4(0.341/5/3) 2022-01-31 19:31 i686 Cygwin
> C:\t>cp 1.txt 2.txt
> C:\t>which cp
> C:\t>cacls 2.txt
> C:\t\2.txt NULL SID:(DENY)(special access:)
> DESKTOP-BCFUMJ4\jay:(DENY)(special access:)
> DESKTOP-BCFUMJ4\jay:(special access:)
> C:\t>more 1.txt
> ECHO is on.
> C:\t>more 2.txt
> Cannot access file C:\t\2.txt
> Same behavior from cygwin64.
> C:\t>\cygwin64\bin\uname -a
> CYGWIN_NT-10.0 DESKTOP-BCFUMJ4 3.3.3(0.341/5/3) 2021-12-03 16:35 x86_64 Cygwin
> I would hope Cygwin could/would just copy the ACLs asis.
> I am guessing there is some failed attempt to translate them
> to an internal form and then back to NT form.
> My real scenario was open/write/read, not cp.exe.
> - Jay
With best regards,
Monday, February 7, 2022 9:59:12
Sorry for my terrible english...
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