Retry memcached tests 3 times on error

.github/workflows/hostap.yml

@@ -250,7 +250,7 @@ jobs:
             TESTS=$(printf '%s\n' "${ary[@]}" | tr '\n' ' ')
             # Retry up to three times
             for i in {1..3}; do
-              HWSIM_RES=0
+              HWSIM_RES=0 # Not set when command succeeds
               # Logs can grow quickly especially in debug mode
               sudo rm -rf logs
               sudo ./start.sh

.github/workflows/memcached.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ -z "$GITHUB_WORKSPACE" ]; then
+	echo '$GITHUB_WORKSPACE is not set'
+	exit 1
+fi
+
+if [ -z "$HOST_ROOT" ]; then
+	echo '$HOST_ROOT is not set'
+	exit 1
+fi
+
+chroot $HOST_ROOT make -C $GITHUB_WORKSPACE/memcached \
+	-j$(nproc) PARALLEL=$(nproc) test_tls

.github/workflows/memcached.yml

@@ -16,6 +16,9 @@ jobs:
           configure: --enable-memcached
           install: true
 
+      - name: Bundle Docker entry point
+        run: cp wolfssl/.github/workflows/memcached.sh build-dir/bin
+
       - name: Upload built lib
         uses: actions/upload-artifact@v3
         with:
@@ -77,5 +80,28 @@ jobs:
       - name: Run memcached tests
         working-directory: ./memcached
         run: |
-          export LD_LIBRARY_PATH=$GITHUB_WORKSPACE/build-dir/lib:$LD_LIBRARY_PATH
-          make -j$(nproc) PARALLEL=$(nproc) test_tls
+          # Retry up to three times
+          # Using docker because interrupting the tests doesn't close running
+          # background servers. They can become daemonized and then all re-runs
+          # will always fail.
+          chmod +x $GITHUB_WORKSPACE/build-dir/bin/memcached.sh
+          for i in {1..3}; do
+            echo "-------- RUNNING TESTS --------"
+            MEMCACHED_RES=0 # Not set when command succeeds
+            # Tests should usually take less than 4 minutes. If already taking
+            # 5 minutes then they are probably stuck. Interrupt and re-run.
+            timeout 5m docker run -v /:/host \
+              -v $GITHUB_WORKSPACE/build-dir/bin/memcached.sh:/memcached.sh \
+              -e GITHUB_WORKSPACE=$GITHUB_WORKSPACE \
+              -e HOST_ROOT=/host \
+              -e LD_LIBRARY_PATH=$GITHUB_WORKSPACE/build-dir/lib:$LD_LIBRARY_PATH \
+              alpine:latest /memcached.sh || MEMCACHED_RES=$?
+
+            if [ "$MEMCACHED_RES" -eq "0" ]; then
+              break
+            fi
+          done
+          echo "test ran $i times"
+          if [ "$MEMCACHED_RES" -ne "0" ]; then
+            exit $MEMCACHED_RES
+          fi