Backport install z to 3.0

cabal-install/Distribution/Client/CmdInstall.hs

@@ -73,7 +73,7 @@ import Distribution.Client.IndexUtils
          ( getSourcePackages, getInstalledPackages )
 import Distribution.Client.ProjectConfig
          ( readGlobalConfig, projectConfigWithBuilderRepoContext
-         , resolveBuildTimeSettings, withProjectOrGlobalConfig )
+         , resolveBuildTimeSettings, withProjectOrGlobalConfigIgn )
 import Distribution.Client.ProjectPlanning
          ( storePackageInstallDirs' )
 import qualified Distribution.Simple.InstallDirs as InstallDirs
@@ -249,6 +249,7 @@ installAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags
     targetFilter = if installLibs then Just LibKind else Just ExeKind
     targetStrings' = if null targetStrings then ["."] else targetStrings
 
+    withProject :: IO ([PackageSpecifier UnresolvedSourcePackage], [TargetSelector], ProjectConfig)
     withProject = do
       let verbosity' = lessVerbose verbosity
 
@@ -369,6 +370,7 @@ installAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags
 
           return (specs ++ packageSpecifiers, selectors ++ packageTargets, projectConfig localBaseCtx)
 
+    withoutProject :: ProjectConfig -> IO ([PackageSpecifier pkg], [TargetSelector], ProjectConfig)
     withoutProject globalConfig = do
       let
         parsePkg pkgName
@@ -420,8 +422,11 @@ installAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags
         packageTargets = flip TargetPackageNamed Nothing . pkgName <$> packageIds
       return (packageSpecifiers, packageTargets, projectConfig)
 
-  (specs, selectors, config) <- withProjectOrGlobalConfig verbosity globalConfigFlag
-                                  withProject withoutProject
+  let
+    ignoreProject = fromFlagOrDefault False (cinstIgnoreProject clientInstallFlags)
+
+  (specs, selectors, config) <-
+     withProjectOrGlobalConfigIgn ignoreProject verbosity globalConfigFlag withProject withoutProject
 
   home <- getHomeDirectory
   let
@@ -513,6 +518,13 @@ installAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags
   -- installables correctly. For that, we need a place to put a
   -- temporary dist directory.
   globalTmp <- getTemporaryDirectory
+
+  -- if we are installing executables, we shouldn't take into account
+  -- environment specifiers.
+  let envSpecs' :: [PackageSpecifier a]
+      envSpecs' | installLibs = envSpecs
+                | otherwise   = []
+
   withTempDirectory
     verbosity
     globalTmp
@@ -522,7 +534,7 @@ installAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags
                  verbosity
                  config
                  tmpDir
-                 (envSpecs ++ specs)
+                 (envSpecs' ++ specs)
                  InstallCommand
 
     buildCtx <-

cabal-install/Distribution/Client/CmdInstall/ClientInstallFlags.hs

@@ -27,7 +27,8 @@ data InstallMethod = InstallMethodCopy
 instance Binary InstallMethod
 
 data ClientInstallFlags = ClientInstallFlags
-  { cinstInstallLibs :: Flag Bool
+  { cinstInstallLibs     :: Flag Bool
+  , cinstIgnoreProject   :: Flag Bool
   , cinstEnvironmentPath :: Flag FilePath
   , cinstOverwritePolicy :: Flag OverwritePolicy
   , cinstInstallMethod :: Flag InstallMethod
@@ -46,6 +47,7 @@ instance Binary ClientInstallFlags
 defaultClientInstallFlags :: ClientInstallFlags
 defaultClientInstallFlags = ClientInstallFlags
   { cinstInstallLibs = toFlag False
+  , cinstIgnoreProject   = toFlag False
   , cinstEnvironmentPath = mempty
   , cinstOverwritePolicy = mempty
   , cinstInstallMethod = mempty
@@ -58,6 +60,10 @@ clientInstallOptions _ =
     "Install libraries rather than executables from the target package."
     cinstInstallLibs (\v flags -> flags { cinstInstallLibs = v })
     trueArg
+  , option "z" ["ignore-project"]
+    "Ignore local project configuration"
+    cinstIgnoreProject (\v flags -> flags { cinstIgnoreProject = v })
+    trueArg
   , option [] ["package-env", "env"]
     "Set the environment file that may be modified."
     cinstEnvironmentPath (\pf flags -> flags { cinstEnvironmentPath = pf })

cabal-install/Distribution/Client/CmdRepl.hs

@@ -30,15 +30,13 @@ import qualified Distribution.Client.InstallPlan as InstallPlan
 import Distribution.Client.ProjectBuilding
          ( rebuildTargetsDryRun, improveInstallPlanWithUpToDatePackages )
 import Distribution.Client.ProjectConfig
-         ( ProjectConfig(..), withProjectOrGlobalConfig
-         , projectConfigConfigFile, readGlobalConfig )
+         ( ProjectConfig(..), withProjectOrGlobalConfigIgn
+         , projectConfigConfigFile )
 import Distribution.Client.ProjectOrchestration
 import Distribution.Client.ProjectPlanning 
        ( ElaboratedSharedConfig(..), ElaboratedInstallPlan )
 import Distribution.Client.ProjectPlanning.Types
        ( elabOrderExeDependencies )
-import Distribution.Client.RebuildMonad
-         ( runRebuild )
 import Distribution.Client.Setup
          ( GlobalFlags, ConfigFlags(..), ConfigExFlags, InstallFlags )
 import qualified Distribution.Client.Setup as Client
@@ -223,11 +221,8 @@ replAction (configFlags, configExFlags, installFlags, haddockFlags, testFlags, r
       with           = withProject    cliConfig             verbosity targetStrings
       without config = withoutProject (config <> cliConfig) verbosity targetStrings
 
-    (baseCtx, targetSelectors, finalizer, replType) <- if ignoreProject
-      then do
-        globalConfig <- runRebuild "" $ readGlobalConfig verbosity globalConfigFlag
-        without globalConfig
-      else withProjectOrGlobalConfig verbosity globalConfigFlag with without
+    (baseCtx, targetSelectors, finalizer, replType) <-
+      withProjectOrGlobalConfigIgn ignoreProject verbosity globalConfigFlag with without
 
     when (buildSettingOnlyDeps (buildSettings baseCtx)) $
       die' verbosity $ "The repl command does not support '--only-dependencies'. "

cabal-install/Distribution/Client/Config.hs

@@ -337,12 +337,13 @@ instance Semigroup SavedConfig where
           combine        = combine'        savedInstallFlags
           lastNonEmptyNL = lastNonEmptyNL' savedInstallFlags
 
-      combinedSavedClientInstallFlags = ClientInstallFlags {
-        cinstInstallLibs = combine cinstInstallLibs,
-        cinstEnvironmentPath = combine cinstEnvironmentPath,
-        cinstOverwritePolicy = combine cinstOverwritePolicy,
-        cinstInstallMethod = combine cinstInstallMethod,
-        cinstInstalldir = combine cinstInstalldir
+      combinedSavedClientInstallFlags = ClientInstallFlags
+        { cinstInstallLibs     = combine cinstInstallLibs
+        , cinstIgnoreProject   = combine cinstIgnoreProject
+        , cinstEnvironmentPath = combine cinstEnvironmentPath
+        , cinstOverwritePolicy = combine cinstOverwritePolicy
+        , cinstInstallMethod   = combine cinstInstallMethod
+        , cinstInstalldir      = combine cinstInstalldir
         }
         where
           combine        = combine'        savedClientInstallFlags

cabal-install/Distribution/Client/ProjectConfig.hs

@@ -28,6 +28,7 @@ module Distribution.Client.ProjectConfig (
     readGlobalConfig,
     readProjectLocalFreezeConfig,
     withProjectOrGlobalConfig,
+    withProjectOrGlobalConfigIgn,
     writeProjectLocalExtraConfig,
     writeProjectLocalFreezeConfig,
     writeProjectConfigFile,
@@ -451,6 +452,24 @@ renderBadProjectRoot :: BadProjectRoot -> String
 renderBadProjectRoot (BadProjectRootExplicitFile projectFile) =
     "The given project file '" ++ projectFile ++ "' does not exist."
 
+-- | Like 'withProjectOrGlobalConfig', with an additional boolean
+-- which tells to ignore local project.
+--
+-- Used to implement -z / --ignore-project behaviour
+--
+withProjectOrGlobalConfigIgn
+    :: Bool -- ^ whether to ignore local project
+    -> Verbosity
+    -> Flag FilePath
+    -> IO a
+    -> (ProjectConfig -> IO a)
+    -> IO a
+withProjectOrGlobalConfigIgn True  verbosity gcf _with without = do
+    globalConfig <- runRebuild "" $ readGlobalConfig verbosity gcf
+    without globalConfig
+withProjectOrGlobalConfigIgn False verbosity gcf with without =
+    withProjectOrGlobalConfig verbosity gcf with without
+
 withProjectOrGlobalConfig :: Verbosity
                           -> Flag FilePath
                           -> IO a

cabal-install/changelog

@@ -7,6 +7,11 @@
 	  ([#6385](https://github.com/haskell/cabal/pull/6385))
 	* Update `setupMinCabalVersionConstraint` for GHC-8.8
 	  ([#6217](https://github.com/haskell/cabal/pull/6217))
+	* Implement `cabal install --ignore-project`
+	  ([#5919](https://github.com/haskell/cabal/issues/5919))
+	* `cabal install executable` solver isn't affected by default
+	  environment contents
+	  ([#6410](https://github.com/haskell/cabal/issues/6410))
 	* Use `lukko` for file locking
 	  ([#6345](https://github.com/haskell/cabal/pull/6345))
 	* Use `hackage-security-0.6`

cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs

@@ -364,6 +364,7 @@ instance Arbitrary ClientInstallFlags where
     arbitrary =
       ClientInstallFlags
         <$> arbitrary
+        <*> arbitrary
         <*> arbitraryFlag arbitraryShortToken
         <*> arbitrary
         <*> arbitrary