Add checks for cmdtest and bc as the errors are otherwise confusing.

2 files changed, 19 insertions, 0 deletions

diff --git a/yarns/900-implements.yarn b/yarns/900-implements.yarn
index bf49b35..657101e 100644
--- a/yarns/900-implements.yarn
+++ b/yarns/900-implements.yarn
@@ -19,11 +19,14 @@ Scenarios can use the ASSUMING statements defined here to let the user
 to allow them to run or not to run.
 
     IMPLEMENTS ASSUMING (fast|build) tests are requested
+    support_required
     test_requested "$MATCH_1"
 
 if `MIRROR` is set, use the default http mirror
 
     IMPLEMENTS ASSUMING (local|http) tests are requested
+    support_required
+    build_support_required
     mirror_requested "$MATCH_1"
 
 ## Building an image, or attempting to
diff --git a/yarns/shell.lib b/yarns/shell.lib
index 08835ab..69b7b06 100644
--- a/yarns/shell.lib
+++ b/yarns/shell.lib
@@ -34,6 +34,22 @@ test_requested()
     fi
 }
 
+support_required()
+{
+    if [ ! -x /usr/bin/cmdtest ]; then
+        echo "All tests need the cmdtest package."
+        return 1
+    fi
+}
+
+
+build_support_required()
+{
+    if [ ! -x /usr/bin/bc ]; then
+        echo "Build tests need the bc package."
+        return 1
+    fi
+}
 
 # Convert a size with a unit, such a kB, to plain bytes.