revert: 撤回 xlings 回退 —— 我的归因是错的,与 xlings 无关

真因是 **mcpp-index 的描述符**:pkgs/x/xpkg.lua 里一个格式错误的 0.0.49 条目把
0.0.47 / 0.0.48 一起吞掉了,那两个版本根本不可解析。已由 mcpplibs/mcpp-index#160
修复。

时间线是决定性的:我最后一次失败在 **17:41:31**,#160 合并在 **17:51:19** ——
失败早于修复 10 分钟。

我的归因链有两处错误,记下来:

1. 先怪 xlings 2026.8.5.2,依据是「#360(.5.1)绿、#361(.5.2)红,且两版之间
   只有一个代码提交」。**相关性是真的,因果是假的** —— 那段时间 mcpp-index 的
   xpkg.lua 也刚好坏了。
2. 回退 xlings 后**仍然失败**,这本该立刻推翻结论,我却先去怀疑自己新加的命令
   长度校验(本地复现证明它没误报)。

内带 xlings 恢复到 2026.8.5.2;已在 openxlings/xlings#486 更正并说明。

另记一条待办:mcpp 调 xlings 用 `install_packages ... 2>/dev/null`,把对方的
报错吞了,失败只剩一行「install_packages failed (exit 1)」,分不清是「版本不存在」
还是「构建失败」。这是我误判的助力之一,应当改掉。

Author: speak-agent

.github/actions/bootstrap-mcpp/action.yml

@@ -25,7 +25,7 @@ inputs:
     # `package.name`, so one of the two was simply unreachable — and which one
     # depended on the machine, which is why CI failed on `compat:lua` on
     # Windows and `mcpplibs.capi:lua` on Linux. Never pin below that.
-    default: '2026.8.5.1'
+    default: '2026.8.5.2'
   cache-target:
     description: also restore/save target/ (build artifacts + BMIs)
     required: false

.github/actions/setup-macos-llvm/action.yml

@@ -15,7 +15,7 @@ inputs:
     # Floor imposed by the index, not a routine bump — see
     # .github/actions/bootstrap-mcpp/action.yml for why 0.4.69 is required
     # (two packages named `lua` in one repo need openxlings/xlings#381).
-    default: '2026.8.5.1'
+    default: '2026.8.5.2'
 
 runs:
   using: composite

.github/workflows/bootstrap-macos.yml

@@ -17,7 +17,7 @@ jobs:
       # Dormant (workflow_dispatch only), but kept in step with the rest —
       # check_version_pins.sh holds it there. Floor: 0.4.69, below which the
       # index cannot resolve two packages that share a short name.
-      XLINGS_VERSION: '2026.8.5.1'
+      XLINGS_VERSION: '2026.8.5.2'
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/ci-fresh-install.yml

@@ -152,7 +152,7 @@ jobs:
         env:
           XLINGS_NON_INTERACTIVE: '1'
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.2
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror
@@ -292,7 +292,7 @@ jobs:
 
       - name: Install xlings + mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.2
           # Deliberately NOT writing to $GITHUB_PATH here. On container
           # images that declare no PATH in their config (opensuse/
           # tumbleweed), appending a single dir to GITHUB_PATH makes the
@@ -363,7 +363,7 @@ jobs:
           #             (older ones carry minos=15 and refuse to start).
           #   v0.4.51+: in-process sha256 — this image has no sha256sum
           #             binary, so pinned fetches failed before it.
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.2
           echo "$HOME/.xlings/subos/current/bin" >> "$GITHUB_PATH"
 
       - name: Install mcpp and config mirror

.github/workflows/ci-linux-e2e.yml

@@ -123,7 +123,7 @@ jobs:
 
       - name: Bootstrap xlings + released mcpp
         run: |
-          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.1
+          curl -fsSL https://raw.githubusercontent.com/openxlings/xlings/main/tools/other/quick_install.sh | bash -s v2026.8.5.2
           export PATH="$HOME/.xlings/subos/current/bin:$PATH"
           xlings update
           xlings install mcpp -y -g

.github/workflows/cross-build-test.yml

@@ -118,7 +118,7 @@ jobs:
           # release assets were uploaded in a broken state (records present,
           # blobs missing → 404 on GET); re-uploaded clean. The stale-INDEX
           # half is handled by the marker-clear below.
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \
@@ -255,7 +255,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \

.github/workflows/release.yml

@@ -96,7 +96,7 @@ jobs:
           # Pin xlings to a known-good version. The upstream install
           # script always grabs `latest` (no version override), so we
           # download + self-install manually to avoid broken releases.
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
@@ -288,7 +288,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           tarball="xlings-${XLINGS_VERSION}-linux-x86_64.tar.gz"
           curl -fsSL -o "/tmp/${tarball}" \
@@ -358,11 +358,11 @@ jobs:
           # below are pinned to the same version as XLINGS_VERSION; they are
           # NOT interpolated from it, so check_version_pins.sh scans for them
           # explicitly (they were absent from the old lock-step comment).
-          XLA="xlings-2026.8.5.1-linux-aarch64.tar.gz"
+          XLA="xlings-2026.8.5.2-linux-aarch64.tar.gz"
           if curl -fsSL -o "/tmp/$XLA" \
-               "https://github.com/openxlings/xlings/releases/download/v2026.8.5.1/$XLA"; then
+               "https://github.com/openxlings/xlings/releases/download/v2026.8.5.2/$XLA"; then
             tar -xzf "/tmp/$XLA" -C /tmp
-            XLBIN=$(find /tmp/xlings-2026.8.5.1-linux-aarch64 -path '*/bin/xlings' -type f | head -1)
+            XLBIN=$(find /tmp/xlings-2026.8.5.2-linux-aarch64 -path '*/bin/xlings' -type f | head -1)
             if [ -n "$XLBIN" ]; then
               mkdir -p "$STAGING/$WRAPPER/registry/bin"
               cp "$XLBIN" "$STAGING/$WRAPPER/registry/bin/xlings"
@@ -440,7 +440,7 @@ jobs:
       - name: Bootstrap mcpp via xlings
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           if [ ! -x "$HOME/.xlings/subos/default/bin/xlings" ]; then
             WORK=$(mktemp -d)
@@ -622,7 +622,7 @@ jobs:
         shell: bash
         env:
           XLINGS_NON_INTERACTIVE: '1'
-          XLINGS_VERSION: '2026.8.5.1'
+          XLINGS_VERSION: '2026.8.5.2'
         run: |
           # Captured before the `cd` below, in POSIX form: this step never
           # returns to the workspace, and GITHUB_WORKSPACE is a backslash

CHANGELOG.md

@@ -27,7 +27,7 @@
 
 ### 其他
 
-- **内带 xlings 保持 2026.8.5.1**。原计划升到 2026.8.5.2,实测它有回归:`install_packages` 装不上 `mcpplibs.xpkg@0.0.48`,`mcpp builds & runs xlings` 这条集成 CI 挂掉且**重跑可复现**(2026.8.5.1 上同一条 job 是绿的)。两版之间只有一个代码提交 —— xlings#481 把 `runtime_deps` 的版本匹配从字符串相等换成 semver 范围满足 —— 而失败正好在依赖安装阶段。已报 openxlings/xlings#486,等对方发新版本再升。
+- 内带 xlings 升到 **2026.8.5.2**(`.github/` 下 16 处 pin 由 `check_version_pins.sh` 机器校验同步)。
 
 ## [2026.8.5.3] — 2026-08-05
 

src/xlings.cppm

@@ -44,7 +44,7 @@ namespace pinned {
     // in lock-step by hand; that list was already missing both composite
     // actions, which is how CI's sandbox sat on 0.4.30 unnoticed while
     // everything else had moved on. Don't reintroduce a hand-maintained list.
-    inline constexpr std::string_view kXlingsVersion   = "2026.8.5.1";
+    inline constexpr std::string_view kXlingsVersion   = "2026.8.5.2";
     inline constexpr std::string_view kNasmVersion     = "3.02";
 }