“Permission Denied” using cygwin in Windows

Question

Background: I am trying to write a [.bat] file so I can double click it and a bash script will get invoked. The bash script will start up a few window

Answer 1

• Check the mount table with cat /proc/mounts or mount and make sure that every mount point out of /, /usr/bin, /usr/lib has a noacl flag. If it's missing, correct /etc/fstab and reboot. (Rebooting synced up the noacl flag of the root mount point for me, and I do not know if the same can be achieved without rebooting).

• Check for a NULL SID record and other strange records in the output of icacls against the file. They appear added on writing by the POSIX ACL translation layer in Cygwin (using "noacl" in /etc/fstab allows disabling that, but the damage will have already been done).

  Resetting the Windows ACL just on the file may not be enough if the containing parents had the NULL SID record. One has to run

  icacls c:\cygwin64 /reset /t /l /c
  

  from Command Prompt to remove the extraneous records from the Windows ACL in each file and directory.

Update Other commands reset the ownership, remove default ACLs and show ACLs of a known binary before and after the changes:

set croot=c:\cygwin64
icacls %croot%\bin\ls.exe
%croot%\bin\getfacl /bin/ls
takeown /F %croot% /R /D Y > nul
icacls %croot% /reset /T /C /L /Q
icacls %croot%\bin\ls.exe

%croot%\bin\getfacl /bin/setfacl
%croot%\bin\getfacl /bin/find
%croot%\bin\setfacl -bk /bin/find
%croot%\bin\find -P / -xdev -exec /bin/setfacl -bk "{}" +

icacls %croot%\bin\ls.exe
%croot%\bin\getfacl /bin/ls