Enable symlink support explicitly (#3406)

motivation: enable git symlink support for Windows

changes: pass core.symlinks=true to git clone operations

Author: stevapple

Sources/SourceControl/GitRepository.swift

@@ -83,7 +83,9 @@ public struct GitRepositoryProvider: RepositoryProvider {
         precondition(!localFileSystem.exists(path))
 
         // FIXME: Ideally we should pass `--progress` here and report status regularly.  We currently don't have callbacks for that.
-        try self.callGit("clone", "--mirror", repository.url, path.pathString,
+        //
+        // NOTE: Explicitly set `core.symlinks=true` on `git clone` to ensure that symbolic links are correctly resolved.
+        try self.callGit("clone", "-c", "core.symlinks=true", "--mirror", repository.url, path.pathString,
                          repository: repository,
                          failureMessage: "Failed to clone repository \(repository.url)")
     }
@@ -118,7 +120,9 @@ public struct GitRepositoryProvider: RepositoryProvider {
             // For editable clones, i.e. the user is expected to directly work on them, first we create
             // a clone from our cache of repositories and then we replace the remote to the one originally
             // present in the bare repository.
-            try self.callGit("clone", "--no-checkout", sourcePath.pathString, destinationPath.pathString,
+            //
+            // NOTE: Explicitly set `core.symlinks=true` on `git clone` to ensure that symbolic links are correctly resolved.
+            try self.callGit("clone", "-c", "core.symlinks=true", "--no-checkout", sourcePath.pathString, destinationPath.pathString,
                              repository: repository,
                              failureMessage: "Failed to clone repository \(repository.url)")
             // The default name of the remote.
@@ -138,7 +142,9 @@ public struct GitRepositoryProvider: RepositoryProvider {
             // re-resolve such that the objects in this repository changed, we would
             // only ever expect to get back a revision that remains present in the
             // object storage.
-            try self.callGit("clone", "--shared", "--no-checkout", sourcePath.pathString, destinationPath.pathString,
+            //
+            // NOTE: Explicitly set `core.symlinks=true` on `git clone` to ensure that symbolic links are correctly resolved.
+            try self.callGit("clone", "-c", "core.symlinks=true", "--shared", "--no-checkout", sourcePath.pathString, destinationPath.pathString,
                              repository: repository,
                              failureMessage: "Failed to clone repository \(repository.url)")
         }