Remove read-only in cabal clean on Windows

cabal-install/src/Distribution/Client/CmdClean.hs

@@ -52,6 +52,10 @@ import Distribution.Simple.Utils
   , info
   , wrapText
   )
+import Distribution.System
+  ( OS (Windows)
+  , buildOS
+  )
 import Distribution.Utils.Path hiding
   ( (<.>)
   , (</>)
@@ -60,6 +64,9 @@ import Distribution.Verbosity
   ( normal
   )
 
+import Control.Exception
+  ( throw
+  )
 import Control.Monad
   ( forM
   , forM_
@@ -78,6 +85,10 @@ import System.Directory
 import System.FilePath
   ( (</>)
   )
+import System.IO.Error
+  ( isPermissionError
+  )
+import qualified System.Process as Process
 
 data CleanFlags = CleanFlags
   { cleanSaveConfig :: Flag Bool
@@ -168,7 +179,15 @@ cleanAction (ProjectFlags{..}, CleanFlags{..}) extraArgs _ = do
         let distRoot = distDirectory distLayout
 
         info verbosity ("Deleting dist-newstyle (" ++ distRoot ++ ")")
-        handleDoesNotExist () $ removeDirectoryRecursive distRoot
+        handleDoesNotExist () $ do
+          if buildOS == Windows
+            then do
+              -- Windows can't delete some git files #10182
+              void $ Process.createProcess_ "attrib" $ Process.shell $ "attrib -s -h -r " <> distRoot <> "\\*.* /s /d"
+              catch
+                (removeDirectoryRecursive distRoot)
+                (\e -> if isPermissionError e then removeDirectoryRecursive distRoot else throw e)
+            else removeDirectoryRecursive distRoot
 
     removeEnvFiles $ distProjectRootDirectory distLayout
 

cabal-testsuite/PackageTests/NewBuild/CmdClean/CleanSourceRepositoryPackage/a.cabal

@@ -0,0 +1,6 @@
+cabal-version: 3.0
+name: aa
+version: 0.1.0.0
+build-type: Simple
+
+library

cabal-testsuite/PackageTests/NewBuild/CmdClean/CleanSourceRepositoryPackage/cabal.out

@@ -0,0 +1,6 @@
+# cabal build
+Resolving dependencies...
+Build profile: -w ghc-<GHCVER> -O1
+In order, the following would be built:
+ - aa-0.1.0.0 (lib) (first run)
+# cabal clean

cabal-testsuite/PackageTests/NewBuild/CmdClean/CleanSourceRepositoryPackage/cabal.project

@@ -0,0 +1,5 @@
+packages: .
+
+source-repository-package
+  type: git
+  location: https://github.com/haskell-hvr/Only

cabal-testsuite/PackageTests/NewBuild/CmdClean/CleanSourceRepositoryPackage/cabal.test.hs

@@ -0,0 +1,6 @@
+import Test.Cabal.Prelude
+
+main = cabalTest $ flaky 10182 $ withProjectFile "cabal.project" $ do
+    cabal' "build" ["--dry-run"]
+    cabal' "clean" []
+    return ()

changelog.d/pr-10190

@@ -0,0 +1,11 @@
+synopsis: Fix `cabal clean` permissions on Windows
+packages: cabal-install
+prs: #10190
+issues: #10182
+significance:
+
+description: {
+
+- `cabal clean` now removes the read-only mark recursively in the `dist-newstyle` folder on Windows before attempting to delete it.
+
+}