Upgrading cabal-install fails on Windows

[bgamari]

Describe the bug
As far as I can tell, the recommended way to update cabal-install is:

$ cabal update
$ cabal install cabal-install

However, this fails on Windows due to that platform's restrictions on deleting running executables:

To Reproduce
Steps to reproduce the behavior:

$ cabal v2-install cabal-install --overwrite-policy=always
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.7.0.0 supports
'ghc' version < 9.4):
C:\msys64\home\ben\ghc-9.4.4-x86_64-unknown-mingw32\bin\ghc.exe is version
9.4.4
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.7.0.0 supports
'ghc' version < 9.4):
C:\msys64\home\ben\ghc-9.4.4-x86_64-unknown-mingw32\bin\ghc.exe is version
9.4.4
Resolving dependencies...
Up to date
Copying 'cabal.exe' to 'C:\Users\ben\AppData\Roaming\cabal\bin\cabal.exe'
C:\Users\ben\AppData\Roaming\cabal\bin\cabal.exe: DeleteFile "\\\\?\\C:\\Users\\ben\\AppData\\Roaming\\cabal\\bin\\cabal.exe": permission denied (Access is denied.)

Expected behavior
A new cabal-install is installed.

System information

• Any Windows
• Any cabal-install and ghc release

Additional context
It's a bit unclear how best to handle this. Perhaps cabal-install should gain a cabal upgrade command, which works around this limitation by first moving the old executable out of the way?

[jneira]

thanks for reporting it, I have hit it for years
my workaround (the trivial one) is set install-dir to an alternative location and replace the executable by hand
but yeah it should work out if the box and a very least add a note to install instructions