[release-branch.go1.26] all: merge master (2baa1d1) into release-branch.go1.26

For #76474.

Change-Id: Ic50e288f99b731b62af9aa73ce6721f0f2f3596d

1 files changed, 30 insertions, 0 deletions

diff --git a/src/os/exec/lookpath.go b/src/os/exec/lookpath.go
new file mode 100644
index 0000000000..71f86b994f
--- /dev/null
+++ b/src/os/exec/lookpath.go
@@ -0,0 +1,30 @@
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package exec
+
+// LookPath searches for an executable named file in the current path,
+// following the conventions of the host operating system.
+// If file contains a slash, it is tried directly and the default path is not consulted.
+// Otherwise, on success the result is an absolute path.
+//
+// LookPath returns an error satisfying [errors.Is](err, [ErrDot])
+// if the resolved path is relative to the current directory.
+// See the package documentation for more details.
+//
+// LookPath looks for an executable named file in the
+// directories named by the PATH environment variable,
+// except as described below.
+//
+//   - On Windows, the file must have an extension named by
+//     the PATHEXT environment variable.
+//     When PATHEXT is unset, the file must have
+//     a ".com", ".exe", ".bat", or ".cmd" extension.
+//   - On Plan 9, LookPath consults the path environment variable.
+//     If file begins with "/", "#", "./", or "../", it is tried
+//     directly and the path is not consulted.
+//   - On Wasm, LookPath always returns an error.
+func LookPath(file string) (string, error) {
+	return lookPath(file)
+}