beesh: Add optional mee_check() target when --check is set

If the bee-file (beesh) is called with --check the special step "check" will
be called after calling "build" and before calling "install".

so if mee_check(), mee_check_pre() or mee_check_post() are defined they will be called
if --check is activated. As long as --check is not activated checks are disabled.

to globally enable checks you may set OPT_CHECK to any value but "no", e.g.
OPT_CHECK="yes".

we may rename those environment variables at a later time so please don't depend on them.
(it's just a quick fix - will be stable for bee-2.0)

src/beesh.sh.in

@@ -94,6 +94,7 @@ function show_help() {
 	    -f, --force-install    same as -i; bee_install is invoked with --force
 	    -h, --help             display this help
 	    --no-archive-build     do not archive the build directory
+	    --check                run mee_check, mee_check_pre and mee_check_post
 
 	EOF
 }
@@ -611,6 +612,7 @@ OPTIONS=$(${BEE_BINDIR}/beegetopt --name beesh \
                  --option debug= \
                  --option archive-build \
                  --option no-archive-build \
+                 --option check \
                  -- "$@")
 
 if [ $? != 0 ] ; then
@@ -622,6 +624,7 @@ eval set -- "${OPTIONS}"
 
 : ${OPT_INSTALL:="no"}
 : ${OPT_CLEANUP:="no"}
+: ${OPT_CHECK:="no"}
 : ${OPT_ARCHIVE_BUILD:="yes"}
 
 while true ; do
@@ -656,6 +659,10 @@ while true ; do
             OPT_ARCHIVE_BUILD="yes"
             shift
             ;;
+        --check)
+            OPT_CHECK="yes"
+            shift
+            ;;
         --debug)
             DEBUG=$2
             shift 2
@@ -790,6 +797,11 @@ cd ${B}
 
 bee_run configure
 bee_run build
+
+if [ "${OPT_CHECK}" != "no" ] ; then
+    bee_run check
+fi
+
 bee_run install
 
 print_info "changing to image directory: ${D}"