fix: normalize native Windows paths in CI fixtures

Author: julixian

README.zh-CN.md

@@ -8,11 +8,11 @@
 [![C++23](https://img.shields.io/badge/C%2B%2B-23-blue.svg)](https://en.cppreference.com/w/cpp/23)
 [![Module](https://img.shields.io/badge/module-ok-green.svg)](https://en.cppreference.com/w/cpp/language/modules)
 [![License](https://img.shields.io/badge/license-Apache_2.0-blue.svg)](LICENSE)
+[![ci](https://github.com/mcpp-community/mcpp/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/mcpp-community/mcpp/actions/workflows/ci.yml)
 
 | [文档](docs/zh/) · [快速开始](docs/zh/01-getting-started.md) · [mcpp.toml 指南](docs/zh/04-mcpp-toml.md) · [示例项目](docs/zh/03-examples.md) · [工具链管理](docs/zh/20-toolchains.md) |
 |:---:|
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-| [![ci](https://github.com/mcpp-community/mcpp/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/mcpp-community/mcpp/actions/workflows/ci.yml) |
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 <p align="center">

tests/e2e/00_fixture_path_hygiene.sh

@@ -25,6 +25,20 @@
 set -euo pipefail
 
 HERE="$(cd "$(dirname "$0")" && pwd)"
+source "$HERE/_host_path.sh"
+
+# CI passes MCPP_HOME in native Windows spelling, not just Git Bash spelling.
+# Both must produce paths safe to interpolate into TOML basic strings.
+case "$(uname -s)" in
+    MINGW* | MSYS* | CYGWIN*)
+        [[ "$(host_path 'C:\Users\runner admin\.mcpp/registry')" == 'C:/Users/runner admin/.mcpp/registry' ]] || {
+            echo "FAIL: host_path did not normalize a native Windows absolute path"
+            exit 1
+        }
+        [[ "$(host_path 'C:/Users/runner admin/.mcpp/registry')" == 'C:/Users/runner admin/.mcpp/registry' ]] || exit 1
+        ;;
+esac
+[[ "$(host_path '../relative directory')" == '../relative directory' ]] || exit 1
 
 # A TOML `path` key: either at the start of a line, or inside an inline table
 # (`{ path = "..." }`). Anchoring this way is what keeps shell assignments such

tests/e2e/_host_path.sh

@@ -36,8 +36,9 @@ host_path() {
     # agree and Windows accepts `/` as a separator. Passing one to `cygpath -m`
     # would silently ANCHOR it at the current directory — which is not where the
     # manifest being written lives — so relative input is returned untouched.
+    # MCPP_HOME can arrive from CI as C:\Users\...; it is absolute too.
     case "$1" in
-        /*) ;;
+        /* | [A-Za-z]:[\\/]*) ;;
         *) printf '%s' "$1"; return 0 ;;
     esac
     case "$(uname -s)" in