ghcup set fails on windows

[ryani]

From ghcup tui, trying to set the ghc version fails:

[ Info  ] This Version of GHC you are trying to set is not installed.
[ ...   ] Would you like to install it first? [Y/N]:
y
[ Info  ] Setting now...
[ Info  ] This Version of GHC you are trying to set is not installed.
[ ...   ] Would you like to install it first? [Y/N]:
y
[ Info  ] Setting now...
[ Info  ] This Version of GHC you are trying to set is not installed.
[ ...   ] Would you like to install it first? [Y/N]:
n
Error: [GHCup-00130] The version 'ghcup' of the tool ghc is not installed.
Press enter to continue

Same GHCup-00130 error from the command line.

History: I had a previous installation of ghcup from a few years back that I tried to upgrade and it had this problem. I ran ghcup nuke, deleted c:\ghc, and reinstalled from the powershell script, and the same problem is still happening.

[ryani]

• The version I am trying to set is installed.
• In fact it's the only version installed, and it is currently the default ghc, although it's not listed as set in the ui
• But in my old install I was trying to upgrade ghc versions and this prevented me from changing to the new version

[hasufell]

Is all antivirus disabled?

Are you out of disk space?

[dfordivam]

Error: [GHCup-00130] The version 'ghcup' of the tool ghc is not installed.

This error is weird, did this happen when doing set from tui ?

This command causes the error, and this is a wrong command.

$ ghcup set ghc ghcup
[ Error ] [GHCup-00130] The version 'ghcup' of the tool ghc is not installed.

Correct one is this

$ ghcup set ghc 9.8.4
[ Info  ] GHC 9.8.4 successfully set as default version

[ryani]

Yes, I get that either from tui or when doing set from the command line:

>ghcup set ghc 9.4.8
[ Info  ] downloading: https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-0.0.9.yaml as file C:\ghc\ghcup\cache\ghcup-0.0.9.yaml
[ Warn  ] New ghc version available. If you want to install this latest version, run 'ghcup install ghc 9.12.1'
[ Warn  ] New cabal version available. If you want to install this latest version, run 'ghcup install cabal 3.14.1.1'
[ Info  ] verifying digest of: gs.exe
[ Error ] [GHCup-00130] The version 'ghcup' of the tool ghc is not installed.

I agree that the error is strange.

[ryani]

Some more info:

ghcup list shows this (as part of its output):

X  ghc   9.4.7      base-4.17.2.0
I  ghc   9.4.8      recommended,base-4.17.2.1 hls-powered
X  ghc   9.6.1      base-4.18.0.0

(I expect this to say IS, that's correct, right?)

where ghc: C:\ghc\ghcup\bin\ghc.exe

ghc --version: The Glorious Glasgow Haskell Compilation System, version 9.4.8

I am pretty sure that if I install another version of ghc that I won't be able to switch to it -- that was the problem that had me reinstall.

[hasufell]

We test that the optparse behaves correctly:

ghcup-hs/test/optparse-test/SetTest.hs

Lines 76 to 80 in ecd41e0

	, ("set ghc 9.2", SetGHCVersion
	$ GHCTargetVersion
	Nothing
	$(versionQ "9.2")
	)

So I'm not sure how that would be possible. Did you add or change files? C:\ghc\ghcup is an unusual directory.

[ryani]

Did you add or change files?

I did not. Here is the timeline:

• Installed ghcup a few years back to c:\ghc. No idea what version.
• Updated ghcup to current and installed a new version of ghc a little over a week ago
• ghcup set failed with the same error as above, and my set ghc version did not change
• Ran ghcup nuke
• After that completed, deleted my c:\ghc directory to remove any remaining stray files and rebooted
• Created a new c:\ghc directory
• Installed ghcup using the powershell installscript from https://www.haskell.org/ghcup/
• Installed ghc (and other tools). It created the proper ghc.exe that points to the new version of ghc, but ghcup doesn't think that's set.
• ghcup set still fails

This isn't blocking for me at the moment since I do have the version I wanted -- but I suspect I still can't update to a new compiler version.

Setting the versions of the other tools (HLS/Cabal) does work.

[hasufell]

Make sure antivirus and windows defender are both disabled.

[dfordivam]

I could reproduce this issue using "c:\ghc" as installation dir. The issue seems to be in the parsing logic to fetch the version from the link / shim path.
I am testing with installation/set of a different ghc, but its still at merging tree for almost two hour now..

[hasufell]

I am testing with installation/set of a different ghc, but its still at merging tree for almost two hour now..

Disable antivirus and windows defender.