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Explain the final error checking
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -289,10 +289,15 @@ fi
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# If the coverage summary doesn't end with the expected last two lines
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# ("Branches Tested" and a blank line), either there was an error while
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# creating the coverage summary or the coverage summary reported failures.
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# The script runs under `set -e`, so most failures cause it to abort,
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# but failures on the left-hand side of a pipe are not detected (this is
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# a limitation of sh), so we check that the left-hand side of the pipe
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# succeeded by checking that it took the last action that it was expected
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# to take.
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newline='
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'
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case "$(tail -n2 coverage-summary.txt)" in
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*"$newline"*) exit 1;;
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"Branches Tested"*) :;;
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*) exit 1;;
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*"$newline"*) exit 1;; # last line was not blank
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"Branches Tested"*) :;; # looks good
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*) exit 1;; # next-to-last line had unexpected content
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esac
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