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Add check for get_packages argument

Add a quick check so we don't reintroduce bad arguments as in
Ie1b8d09369281059d21da61b2725a457f708ae9e

Change-Id: Ibebc71791f2743eef64d6f7c2596d54a73ea92aa

Ian Wienand authored on 2015/11/09 13:04:32
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@@ -1075,6 +1075,10 @@ function get_packages {
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     local file_to_parse=""
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     local service=""
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+    if [ $# -ne 1 ]; then
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+        die $LINENO "get_packages takes a single, comma-separated argument"
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+    fi
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+
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     if [[ -z "$package_dir" ]]; then
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         echo "No package directory supplied"
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         return 1