James Zern 2ebe0aee11 tools_common.sh: add directory name to error output
+ add a helper function to reduce the duplication

this is a bit clearer when the environment variable is set, but the
directory is missing

Change-Id: I08f9b56122b5741bb40a5f795f7f82f5b49f1047
2015-02-26 12:57:30 -08:00
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