fix(core): capture native cwd from Git Bash on Windows

Author: qorzj

packages/core/src/tests/tool-handlers.test.ts

@@ -249,7 +249,9 @@ for (const replacement of ["deleted", "file"]) {
     const subdir = path.join(workspace, "child");
     fs.mkdirSync(subdir);
     const context = createContext(`bash-cwd-${replacement}`, workspace);
-    assert.equal((await handleBashTool({ command: "cd child" }, context)).ok, true);
+    const changed = await handleBashTool({ command: "cd child" }, context);
+    assert.equal(changed.ok, true);
+    assert.equal(fs.realpathSync(String(changed.metadata?.cwd)), fs.realpathSync(subdir));
     const retained = await handleBashTool({ command: "pwd" }, context);
     assert.equal(fs.realpathSync(String(retained.metadata?.startCwd)), fs.realpathSync(subdir));
     fs.rmdirSync(subdir);
@@ -260,6 +262,25 @@ for (const replacement of ["deleted", "file"]) {
   });
 }
 
+test(
+  "Bash preserves Git Bash virtual mount cwd as a native Windows directory",
+  { skip: process.platform !== "win32" },
+  async () => {
+    const context = createContext("bash-virtual-cwd", createTempWorkspace());
+    const changed = await handleBashTool({ command: "cd /tmp && pwd -W" }, context);
+    assert.equal(changed.ok, true);
+    const nativeCwd = String(changed.metadata?.cwd);
+    assert.equal(path.isAbsolute(nativeCwd), true);
+    assert.equal(fs.statSync(nativeCwd).isDirectory(), true);
+    assert.equal(fs.realpathSync(nativeCwd), fs.realpathSync((changed.output ?? "").trim()));
+
+    const retained = await handleBashTool({ command: "pwd -W" }, context);
+    assert.equal(retained.ok, true);
+    assert.equal(fs.realpathSync(String(retained.metadata?.startCwd)), fs.realpathSync(nativeCwd));
+    assert.equal(fs.realpathSync((retained.output ?? "").trim()), fs.realpathSync(nativeCwd));
+  }
+);
+
 test("Bash reports an invalid project root as a spawn failure", { timeout: 3_000 }, async () => {
   const root = path.join(createTempWorkspace(), "missing");
   const result = await handleBashTool({ command: "pwd" }, createContext("bash-invalid-root", root));

packages/core/src/tools/bash-handler.ts

@@ -147,6 +147,9 @@ function buildShellCommand(command: string): {
   const initCommand = buildShellInitCommand(shellPath);
   const disableExtglobCommand = buildDisableExtglobCommand(shellPath);
   const normalizedCommand = rewriteWindowsNullRedirect(command);
+  // Git Bash mounts such as /tmp and /usr cannot be mapped by replacing
+  // separators or drive prefixes. Ask Bash for the native path while it is alive.
+  const cwdExpression = process.platform === "win32" ? '"$(builtin pwd -W)"' : '"$PWD"';
   const wrappedParts = [];
   if (initCommand) {
     wrappedParts.push(initCommand);
@@ -157,7 +160,7 @@ function buildShellCommand(command: string): {
   wrappedParts.push(
     normalizedCommand,
     "__DEEPCODE_STATUS__=$?",
-    `printf '%s%s\\n' "${marker}" "$PWD"`,
+    `printf '%s%s\\n' "${marker}" ${cwdExpression}`,
     "exit $__DEEPCODE_STATUS__"
   );
   const wrappedCommand = `{ ${wrappedParts.join("; ")}; } < /dev/null`;