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When using <<-, the heredoc terminator may only be indented with tabs.
PropertyValue
SeverityError
CategoryBest Practices
DefaultEnabled (via shellcheck/*)
Auto-fixYes (--fix, safe)

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Description

The <<- heredoc form strips leading tabs from heredoc lines. Leading spaces before the terminator are invalid and can prevent correct heredoc termination. tally reports this as shellcheck/SC1040 and provides an auto-fix that removes only the extra leading spaces from the terminator indentation.

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Examples

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Problematic code

RUN <<'SCRIPT'
cat <<-EOF
hello
  EOF
EOF
SCRIPT

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Correct code

RUN <<'SCRIPT'
cat <<-EOF
hello
	EOF
EOF
SCRIPT

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Auto-fix

The fix is minimal:
  • removes only leading space runs in the offending terminator line
  • preserves tab indentation
  • emits narrow edits so other fixes can still apply to the same script
tally lint --fix --select shellcheck/SC1040 Dockerfile

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Reference