DEBUG

This is a bit more complex than `uses: mxschmitt/action-tmate@v3`
because I need to do this in the context of the minimal SDK.

Technically, I could do it with the MSYS2 installation, but the
`windows-11-arm` runners do not have that by default.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

.github/workflows/main.yml

@@ -29,6 +29,49 @@ jobs:
     - uses: git-for-windows/setup-git-for-windows-sdk@v1
       with:
         architecture: aarch64
+    - name: debug using tmate (detached)
+      shell: bash
+      run: |
+        set -x &&
+        cat /etc/profile &&
+        . /etc/profile &&
+        (
+          cd / &&
+          G4W=/c/Program\ Files/Git &&
+          cp -n "$G4W"/usr/bin/{ssh-keygen.exe,msys-crypto-3.dll,msys-z.dll} usr/bin/ &&
+
+          CURL="$WINDIR"/system32/curl.exe &&
+          TAR="$WINDIR"/system32/tar.exe &&
+          "$CURL" -Lo /tmp/tmate.tar.zst https://repo.msys2.org/msys/x86_64/tmate-2.4.0-5-x86_64.pkg.tar.zst &&
+          "$TAR" xvf /tmp/tmate.tar.zst usr/bin/tmate.exe &&
+          "$CURL" -Lo /tmp/libevent.tar.zst https://repo.msys2.org/msys/x86_64/libevent-2.1.12-4-x86_64.pkg.tar.zst &&
+          "$TAR" xvf /tmp/libevent.tar.zst usr/bin/msys-event-2-1-7.dll &&
+          "$CURL" -Lo /tmp/msgpack-c.tar.zst https://repo.msys2.org/msys/x86_64/msgpack-c-6.1.0-2-x86_64.pkg.tar.zst &&
+          "$TAR" xvf /tmp/msgpack-c.tar.zst usr/bin/msys-msgpack-c-2.dll &&
+          "$CURL" -Lo /tmp/libssh.tar.zst https://repo.msys2.org/msys/x86_64/libssh-0.11.1-2-x86_64.pkg.tar.zst &&
+          "$TAR" xvf /tmp/libssh.tar.zst usr/bin/msys-ssh-4.dll
+        ) &&
+
+        # restrict SSH access to the "actor", i.e. the GitHub user who triggered this workflow
+        # this requires calling `ssh -i <private-key> [...]` later on
+        mkdir -p ~/.ssh &&
+        curl -H 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
+          https://api.github.com/users/${{github.actor}}/keys |
+        sed -n 's/.*"key": "\(.*\)".*/\1/p' >~/.ssh/authorized_keys &&
+
+        # Generate an SSH key (needed for tmate)
+        echo -e 'y\n' | ssh-keygen -q -t rsa -N '' -f ~/.ssh/id_rsa &&
+
+        # Start tmate session
+        export CHERE_INVOKING=1 &&
+        tmate -S /tmp/tmate.sock -a ~/.ssh/authorized_keys new-session -d &&
+        tmate -S /tmp/tmate.sock wait tmate-ready &&
+
+        # Print SSH invocation
+        tmate -S /tmp/tmate.sock display -p '#{tmate_ssh}'
+      env:
+        HOME: ${{runner.workspace}}
+        NO_PERL: 1
     - name: build
       shell: bash
       env:
@@ -42,6 +85,16 @@ jobs:
       with:
         name: windows-artifacts
         path: artifacts
+    - name: wait for tmate to be done
+      if: always()
+      shell: bash
+      run: |
+        PATH=$HOME/bin:$PATH
+        while test -e /tmp/tmate.sock
+        do
+          tmate -S /tmp/tmate.sock display -p '#{tmate_ssh}'
+          sleep 5
+        done
   windows-test:
     name: win test
     runs-on: windows-11-arm