test: make entrypoint script behavior configurable

Adds cli parsing to the entrypoint script allowing for:
1. Custom path to micro-osd script
   This allows easier testing of the script itself or quick
   and dirty customization for special one-off tests
2. Selecting tests to run (or "ALL" or "NONE")
   This allows the user to run only a subset of the tests as needed.
3. Option to pause indefinitely after tests complete
   This keeps the containerized environment alive after tests
   have run for debugging or just for creating a quick and dirty
   ceph environment for playing around.

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

entrypoint.sh

@@ -2,18 +2,76 @@
 
 set -e
 
-rm -rf /tmp/ceph
-mkdir /tmp/ceph
-/micro-osd.sh /tmp/ceph
+TEST_RUN=ALL
+PAUSE=no
+MICRO_OSD_PATH="/micro-osd.sh"
+
+CLI="$(getopt -o h --long test-run:,pause,micro-osd:,help -n "$0" -- "$@")"
+eval set -- "${CLI}"
+while true ; do
+    case "$1" in
+        --test-run)
+            TEST_RUN="$2"
+            shift
+            shift
+        ;;
+        --pause)
+            PAUSE=yes
+            shift
+        ;;
+        --micro-osd)
+            MICRO_OSD_PATH="$2"
+            shift
+            shift
+        ;;
+        -h|--help)
+            echo "Options:"
+            echo "  --test-run=VALUE    Run selected test or ALL, NONE"
+            echo "                      ALL is the default"
+            echo "  --pause             Sleep forever after tests execute"
+            echo "  --micro-osd         Specify path to micro-osd script"
+            echo "  -h|--help           Display help text"
+            echo ""
+            exit 0
+        ;;
+        --)
+            shift
+            break
+        ;;
+        *)
+            echo "unknown option" >&2
+            exit 2
+        ;;
+    esac
+done
+
+mkdir -p /tmp/ceph
+"${MICRO_OSD_PATH}" /tmp/ceph
 export CEPH_CONF=/tmp/ceph/ceph.conf
 
 export PATH=/usr/lib/go-1.10/bin:$PATH
 
-go get -t -v ./...
-diff -u <(echo -n) <(gofmt -d -s .)
-#go vet ./...
-#go list ./...
-P=github.com/ceph/go-ceph
-GOCACHE=off go test -v -covermode=count -coverprofile=cover.out -coverpkg=$P/cephfs,$P/rados,$P/rbd ./...
-mkdir -p /results/coverage
-go tool cover -html=cover.out -o /results/coverage/go-ceph.html
+if [[ ${TEST_RUN} == NONE ]]; then
+    echo "skipping test execution"
+else
+    go get -t -v ./...
+    diff -u <(echo -n) <(gofmt -d -s .)
+    #go vet ./...
+    #go list ./...
+    P=github.com/ceph/go-ceph
+    testargs=(\
+        "-covermode=count" \
+        "-coverprofile=cover.out" \
+        "-coverpkg=$P/cephfs,$P/rados,$P/rbd")
+    if [[ ${TEST_RUN} != ALL ]]; then
+        testargs+=("-run" "${TEST_RUN}")
+    fi
+
+    GOCACHE=off go test -v "${testargs[@]}" ./...
+    mkdir -p /results/coverage
+    go tool cover -html=cover.out -o /results/coverage/go-ceph.html
+fi
+
+if [[ ${PAUSE} = yes ]]; then
+    sleep infinity
+fi