Installation using Cygwin's Python is broken

[rolisoft]

Installation using Cygwin's Python is broken

[RoliSoft]

Hi,

It seems I forgot that Python under Cygwin uses /cygdrive/ for paths, not the Windows version.

I will need to check for this and handle the paths accordingly.

In the meantime, you won't be able to do anything with the scripts under Cygwin. If you're eager, you could try the official Windows version of Python 3.

[RoliSoft]

Seems like this has more challenges than just the correct path handling. A few crucial Windows-specific calls are missing from Cygwin's Python that are otherwise present in the Windows distribution. For example, ctypes.windll for __stdcall-ing the ntfsea library functions is missing, only ctypes.cdll is present with the __cdecl calling convention. Other than that, simple things such as sys.getwindowsversion() or os.getenv('LocalAppData') are missing, or don't return the expected value.

[Efreak]

There is no winreg package in cygwin's* python. There is a cygwinreg available for installing via pip, however installing it doesn't help, even if I swap utils.py:8 to import cygwinreg.

It should be fairly simple to get around some of the mentioned issues;

• sys.getwindowsversion()
  • cmd.exe /c ver
  • systeminfo.exe | grep OS
  • python: platform.system()
• os.getenv('LocalAppData')
  • cmd.exe /c echo %LocalAppData%
  • python: os.getenv('LOCALAPPDATA')
• import winreg
  • /proc/registry (read-only)
  • regedit.exe file.reg (requires a .reg file)
  • reg.exe query /?, reg.exe add /?, reg flags /?

* I'm actually using babun, but it uses uses the same setup.ini to download the same binaries as setup.exe.

[RoliSoft]

Thank you for taking the time and contributing solutions. I've made some progress over the weekend, but didn't have time to finish it yet.

For future reference, there are a few better solutions, such as fallback to cygwinreg:

try:
    import _winreg
except:
    import cygwinreg

And as for handling paths and expanding such variables, cygpath is a really useful command that comes preinstalled with Cygwin.

I'm not using babun, however, as far as I know it is based on Cygwin and should not deviate so hard that the script would not. Should babun not work when the Cygwin support comes out, please open a separate ticket, so I can take a look at it.

I'm trying to support most scenarios Windows users could be running a Python script under.

[RoliSoft]

Well, cygwinreg does not support Python 3, so that solution is completely out.

Otherwise all other issues are fixed, and the script would be ready to go.

[RoliSoft]

1036f15 adds support for Cygwin, however, it does not work yet.

Cygwin has a weird permission mapping scheme[1][2], which requires permissions to be completely reset before Windows can access any files or directories created.

Although running icacls rootfs-temp /t /reset fixes this after the fact, while the extraction is happening, the NTFS Extended Attributes writer library has no access to the files, and as such the extracted files have no extended attributes.

This is a pretty annoying issue, it would be really nice if I could temporarily turn off this Windows-breaking permission mapping scheme. Alternatively, I'll most likely delay the attribute restoration part, however, this requires significant design changes on my part.

[RoliSoft]

1036f15 fixes the permission issue.

One more issue left: on WSL versions before Windows interoperability, the hook scripts won't run as the output cannot be piped into Mintty. The user will just get " r r o r : 0 x 8 0 0 7 0 0 5 7".

Otherwise, the WSL installation is working. On Insider previews, the hook scripts will work as well.