entrypoint: support executing only implements tool

The implements tool just does static code (ast) analysis. Support
running it in the container, but on its own in the case you only
want the implements tool output.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

entrypoint.sh

@@ -85,7 +85,8 @@ while true ; do
         ;;
         -h|--help)
             echo "Options:"
-            echo "  --test-run=VALUE    Run selected test or ALL, NONE"
+            echo "  --test-run=VALUE    Run selected test or ALL, NONE,"
+            echo "                      IMPLEMENTS"
             echo "                      ALL is the default"
             echo "  --test-bench=VALUE  Run selected benchmarks"
             echo "  --test-pkg=PKG      Run only tests from PKG"
@@ -239,13 +240,9 @@ pre_all_tests() {
     echo "mode: count" > "cover.out"
 }
 
-post_all_tests() {
-    if [[ ${COVERAGE} = yes ]]; then
-        mkdir -p "${RESULTS_DIR}/coverage"
-        show go tool cover -html=cover.out -o "${RESULTS_DIR}/coverage/go-ceph.html"
-    fi
-    if [[ ${COVERAGE} = yes ]] && command -v castxml >/dev/null ; then
-        mkdir -p "${RESULTS_DIR}/coverage"
+implements_tool() {
+    if command -v castxml >/dev/null ; then
+        mkdir -p "${RESULTS_DIR}"
         show ./implements --list \
             --report-json "${RESULTS_DIR}/implements.json" \
             --report-text "${RESULTS_DIR}/implements.txt" \
@@ -255,6 +252,16 @@ post_all_tests() {
     fi
 }
 
+post_all_tests() {
+    if [[ ${COVERAGE} = yes ]]; then
+        mkdir -p "${RESULTS_DIR}/coverage"
+        show go tool cover -html=cover.out -o "${RESULTS_DIR}/coverage/go-ceph.html"
+    fi
+    if [[ ${COVERAGE} = yes ]]; then
+        implements_tool
+    fi
+}
+
 test_go_ceph() {
     mkdir -p /tmp/ceph
     if ! [[ ${WAIT_FILES} ]]; then
@@ -266,6 +273,12 @@ test_go_ceph() {
         echo "skipping test execution"
         return 0
     fi
+    if [[ ${TEST_RUN} == IMPLEMENTS ]]; then
+        echo "skipping tests, executing implements tool"
+        pre_all_tests
+        implements_tool
+        return $?
+    fi
 
     PKG_PREFIX=github.com/ceph/go-ceph
     pkgs=$(go list ./... | sed -e "s,^${PKG_PREFIX}/\?,," | grep -v ^contrib)