shellcheck/SC1040

When using <<-, the heredoc terminator may only be indented with tabs.

Property	Value
Severity	Error
Category	Best Practices
Default	Enabled (via `shellcheck/*`)
Auto-fix	Yes (`--fix`, safe)

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.

Examples

Problematic code

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

Correct code

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

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

Reference

ShellCheck SC1040

​Description

​Examples

​Problematic code

​Correct code

​Auto-fix

​Reference