Honor build-tool-depends in CmdRun

Similarly to CmdExec and CmdTest, get paths to all dependency binaries
and add those to PATH. Unlike CmdExec, add just the explicitly required
paths.

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

@@ -263,6 +263,7 @@ withTempEnvFile verbosity baseCtx buildCtx buildStatus action = do
         action envOverrides
     )
 
+-- | Get paths to all dependency executables to be included in PATH and log them.
 pathAdditions :: Verbosity -> ProjectBaseContext -> ProjectBuildContext -> IO [FilePath]
 pathAdditions verbosity ProjectBaseContext{..} ProjectBuildContext{..} = do
   info verbosity . unlines $
@@ -274,6 +275,7 @@ pathAdditions verbosity ProjectBaseContext{..} ProjectBuildContext{..} = do
       S.toList $
         binDirectories distDirLayout elaboratedShared elaboratedPlanToExecute
 
+-- | Get paths to all dependency executables to be included in PATH.
 binDirectories
   :: DistDirLayout
   -> ElaboratedSharedConfig

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

@@ -56,6 +56,7 @@ import Distribution.Client.ProjectPlanning
   )
 import Distribution.Client.ProjectPlanning.Types
   ( dataDirsEnvironmentForPlan
+  , elabExeDependencyPaths
   )
 import Distribution.Client.ScriptUtils
   ( AcceptNoTargets (..)
@@ -275,6 +276,12 @@ runAction flags@NixStyleFlags{..} targetAndArgs globalFlags =
         dieWithException verbosity $
           MultipleMatchingExecutables exeName (fmap (\p -> " - in package " ++ prettyShow (elabUnitId p)) elabPkgs)
 
+    -- Some dependencies may have executables. Let's put those on the PATH.
+    let extraPaths = elabExeDependencyPaths pkg
+    info verbosity . unlines $
+      "Including the following directories in PATH:"
+        : extraPaths
+
     let defaultExePath =
           binDirectoryFor
             (distDirLayout baseCtx)
@@ -300,6 +307,7 @@ runAction flags@NixStyleFlags{..} targetAndArgs globalFlags =
                 dataDirsEnvironmentForPlan
                   (distDirLayout baseCtx)
                   elaboratedPlan
+            , progInvokePathEnv = extraPaths
             }
   where
     (targetStr, args) = splitAt 1 targetAndArgs

changelog.d/pr-9341

@@ -0,0 +1,11 @@
+synopsis: Fix run command environment
+packages: cabal-install
+prs: #9341
+issues: #8391
+
+description: {
+
+- The Run command will now add binary paths of dependencies
+  (build-tool-depends) to PATH, just like Exec and Test commands.
+
+}