69 lines
1.4 KiB
Bash
Executable File
69 lines
1.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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usage() {
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cat <<'USAGE'
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Usage: scripts/remove_zero_readings.sh [--dry-run] [--yes]
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Removes readings where temperature, humidity, and battery are all zero.
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Options:
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--dry-run Count matching readings without deleting them.
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--yes Delete without prompting.
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--help Show this help.
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USAGE
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}
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dry_run=0
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assume_yes=0
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--dry-run)
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dry_run=1
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;;
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--yes|-y)
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assume_yes=1
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;;
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--help|-h)
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usage
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exit 0
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;;
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*)
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echo "Unknown option: $1" >&2
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usage >&2
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exit 2
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;;
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esac
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shift
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done
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where_clause="temperature = 0 AND humidity = 0 AND battery = 0"
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run_mysql() {
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docker compose exec -T db sh -c 'MYSQL_PWD="$MYSQL_PASSWORD" exec mysql -u"$MYSQL_USER" "$MYSQL_DATABASE" "$@"' sh "$@"
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}
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matching_count=$(
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printf 'SELECT COUNT(*) FROM readings WHERE %s;\n' "$where_clause" | run_mysql --batch --skip-column-names
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)
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echo "Found ${matching_count} all-zero reading(s)."
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if [[ "$dry_run" -eq 1 || "$matching_count" -eq 0 ]]; then
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exit 0
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fi
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if [[ "$assume_yes" -ne 1 ]]; then
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read -r -p "Delete these readings? Type 'yes' to continue: " answer
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if [[ "$answer" != "yes" ]]; then
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echo "No records deleted."
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exit 0
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fi
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fi
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printf 'DELETE FROM readings WHERE %s;\nSELECT ROW_COUNT();\n' "$where_clause" |
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run_mysql --batch --skip-column-names |
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tail -n 1 |
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xargs printf 'Deleted %s all-zero reading(s).\n'
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