Use preinstalled msys2

.github/workflows/ci.yml

@@ -102,9 +102,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB
@@ -212,9 +209,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB
@@ -564,9 +558,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB

src/ci/azure-pipelines/steps/run.yml

@@ -82,10 +82,6 @@ steps:
   displayName: Install msys2
   condition: and(succeeded(), not(variables.SKIP_JOB))
 
-- bash: src/ci/scripts/install-msys2-packages.sh
-  displayName: Install msys2 packages
-  condition: and(succeeded(), not(variables.SKIP_JOB))
-
 - bash: src/ci/scripts/install-mingw.sh
   displayName: Install MinGW
   condition: and(succeeded(), not(variables.SKIP_JOB))

src/ci/github-actions/ci.yml

@@ -147,10 +147,6 @@ x--expand-yaml-anchors--remove:
         run: src/ci/scripts/install-msys2.sh
         <<: *step
 
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        <<: *step
-
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         <<: *step

src/ci/scripts/install-msys2.sh

@@ -1,28 +1,33 @@
 #!/bin/bash
 # Download and install MSYS2, needed primarily for the test suite (run-make) but
 # also used by the MinGW toolchain for assembling things.
-#
-# FIXME: we should probe the default azure image and see if we can use the MSYS2
-# toolchain there. (if there's even one there). For now though this gets the job
-# done.
 
 set -euo pipefail
 IFS=$'\n\t'
 
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
 if isWindows; then
-    # Pre-followed the api/v2 URL to the CDN since the API can be a bit flakey
-    curl -sSL https://packages.chocolatey.org/msys2.20190524.0.0.20191030.nupkg > \
-        msys2.nupkg
-    curl -sSL https://packages.chocolatey.org/chocolatey-core.extension.1.3.5.1.nupkg > \
-        chocolatey-core.extension.nupkg
-    choco install -s . msys2 \
-        --params="/InstallDir:$(ciCheckoutPath)/msys2 /NoPath" -y --no-progress
-    rm msys2.nupkg chocolatey-core.extension.nupkg
-    mkdir -p "$(ciCheckoutPath)/msys2/home/${USERNAME}"
-    ciCommandAddPath "$(ciCheckoutPath)/msys2/usr/bin"
+    msys2Path="c:/msys64"
+    mkdir -p "${msys2Path}/home/${USERNAME}"
+    ciCommandAddPath "${msys2Path}/usr/bin"
 
     echo "switching shell to use our own bash"
-    ciCommandSetEnv CI_OVERRIDE_SHELL "$(ciCheckoutPath)/msys2/usr/bin/bash.exe"
+    ciCommandSetEnv CI_OVERRIDE_SHELL "${msys2Path}/usr/bin/bash.exe"
+
+    # Detect the native Python version installed on the agent. On GitHub
+    # Actions, the C:\hostedtoolcache\windows\Python directory contains a
+    # subdirectory for each installed Python version.
+    #
+    # The -V flag of the sort command sorts the input by version number.
+    native_python_version="$(ls /c/hostedtoolcache/windows/Python | sort -Vr | head -n 1)"
+
+    # Make sure we use the native python interpreter instead of some msys equivalent
+    # one way or another. The msys interpreters seem to have weird path conversions
+    # baked in which break LLVM's build system one way or another, so let's use the
+    # native version which keeps everything as native as possible.
+    python_home="/c/hostedtoolcache/windows/Python/${native_python_version}/x64"
+    cp "${python_home}/python.exe" "${python_home}/python3.exe"
+    ciCommandAddPath "C:\\hostedtoolcache\\windows\\Python\\${native_python_version}\\x64"
+    ciCommandAddPath "C:\\hostedtoolcache\\windows\\Python\\${native_python_version}\\x64\\Scripts"
 fi