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57aa7d101b
Fix crash when df produces unexpected output that results in empty
AVAILABLE_SPACE variable, causing 'integer expression expected' error.
Problem:
- df may produce unexpected output format (different locale, unusual
filesystem name spanning lines, or non-standard df implementation)
- While '|| echo "0"' handles pipeline failures, it doesn't trigger if
awk succeeds but produces no output (empty string)
- When AVAILABLE_SPACE is empty, comparison [ "$AVAILABLE_SPACE" -lt 500 ]
fails with 'integer expression expected' error
- With set -e, this causes script to exit unexpectedly
Solution:
- Add AVAILABLE_SPACE=${AVAILABLE_SPACE:-0} before comparison to ensure
variable always has a numeric value (defaults to 0 if empty)
- This gracefully handles edge cases where df/awk produces unexpected output