chainlint: match arbitrary here-docs tags rather than hard-coded names
chainlint.sed swallows top-level here-docs to avoid being fooled by
content which might look like start-of-subshell. It likewise swallows
here-docs in subshells to avoid marking content lines as breaking the
&&-chain, and to avoid being fooled by content which might look like
end-of-subshell, start-of-nested-subshell, or other specially-recognized
constructs.
At the time of implementation, it was believed that it was not possible
to support arbitrary here-doc tag names since 'sed' provides no way to
stash the opening tag name in a variable for later comparison against a
line signaling end-of-here-doc. Consequently, tag names are hard-coded,
with "EOF" being the only tag recognized at the top-level, and only
"EOF", "EOT", and "INPUT_END" being recognized within subshells. Also,
special care was taken to avoid being confused by here-docs nested
within other here-docs.
In practice, this limited number of hard-coded tag names has been "good
enough" for the 13000+ existing Git test, despite many of those tests
using tags other than the recognized ones, since the bodies of those
here-docs do not contain content which would fool the linter.
Nevertheless, the situation is not ideal since someone writing new
tests, and choosing a name not in the "blessed" set could potentially
trigger a false-positive.
To address this shortcoming, upgrade chainlint.sed to handle arbitrary
here-doc tag names, both at the top-level and within subshells.
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-13 10:47:34 +02:00
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# LINT: inner "EOF" not misintrepreted as closing ARBITRARY here-doc
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cat <<ARBITRARY >foop &&
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naddle
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fub <<EOF
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nozzle
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noodle
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EOF
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formp
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ARBITRARY
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2018-07-11 08:46:38 +02:00
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(
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# LINT: inner "EOF" not misintrepreted as closing INPUT_END here-doc
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cat <<-\INPUT_END &&
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fish are mice
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but geese go slow
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data <<EOF
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perl is lerp
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and nothing else
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EOF
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toink
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INPUT_END
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# LINT: same but missing "&&"
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cat <<-\EOT
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text goes here
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data <<EOF
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data goes here
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EOF
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more test here
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EOT
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foobar
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)
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