Fix isIgnored and add test for it

Author: ViktorSimko

Sources/SourceControl/GitRepository.swift

@@ -404,7 +404,7 @@ public class GitRepository: Repository, WorkingCheckout {
     /// Returns true if the file at `path` is ignored by `git`
     public func isIgnored(_ path: AbsolutePath) throws -> Bool {
         return try queue.sync {
-            let result = try Process.popen(args: Git.tool, "check-ignore", path.asString)
+            let result = try Process.popen(args: Git.tool, "-C", self.path.asString, "check-ignore", path.asString)
 
             switch result.exitStatus {
             case .terminated(code: 0):

Tests/SourceControlTests/GitRepositoryTests.swift

@@ -605,6 +605,22 @@ class GitRepositoryTests: XCTestCase {
         }
     }
 
+    func testIgnored() throws {
+        mktmpdir { path in
+            // Create a repo.
+            let testRepoPath = path.appending(component: "test-repo")
+            try makeDirectories(testRepoPath)
+            initGitRepo(testRepoPath)
+            let repo = GitRepository(path: testRepoPath)
+
+            // Add a .gitignore
+            try localFileSystem.writeFileContents(testRepoPath.appending(component: ".gitignore"), bytes: "ignored_file")
+
+            XCTAssertTrue(try repo.isIgnored(testRepoPath.appending(component: "ignored_file")))
+            XCTAssertFalse(try repo.isIgnored(testRepoPath.appending(component: "not_ignored_file")))
+        }
+    }
+
     static var allTests = [
         ("testBranchOperations", testBranchOperations),
         ("testCheckoutRevision", testCheckoutRevision),