55 lines
1.6 KiB
Bash
55 lines
1.6 KiB
Bash
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#!/bin/bash
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# watchdog-alert-check.sh - Check for new failed browser relaunches.
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#
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# Scans /home/super/Projects/NetVM/chromebox-watchdog.log for
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# "relaunch FAILED" lines newer than the watermark.
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#
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# Watermark: /home/super/Projects/NetVM/watchdog-alert-watermark.txt
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# Holds the last reported log line (or is empty/missing on first run).
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#
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# Output contract:
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# - No new failures: print nothing, exit 0.
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# - New failures: print each new "relaunch FAILED" line, update the
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# watermark to the newest line, exit 1.
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#
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# Self-contained: no arguments, no nested quoting. Safe to call from cron
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# or from the box CLI.
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set -u
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LOG="/home/super/Projects/NetVM/chromebox-watchdog.log"
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WATERMARK="/home/super/Projects/NetVM/watchdog-alert-watermark.txt"
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# No log file -> nothing to report.
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[ -f "$LOG" ] || exit 0
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# Gather all FAILED lines in chronological order.
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mapfile -t failed < <(grep "relaunch FAILED" "$LOG" 2>/dev/null || true)
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[ "${#failed[@]}" -gt 0 ] || exit 0
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# Read the watermark (last reported line). Missing/empty = report everything.
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watermark=""
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[ -f "$WATERMARK" ] && watermark="$(cat "$WATERMARK")"
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# Collect lines strictly newer than the watermark.
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new_lines=()
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if [ -z "$watermark" ]; then
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new_lines=("${failed[@]}")
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else
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seen_watermark=0
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for line in "${failed[@]}"; do
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if [ "$seen_watermark" -eq 1 ]; then
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new_lines+=("$line")
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elif [ "$line" = "$watermark" ]; then
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seen_watermark=1
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fi
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done
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fi
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[ "${#new_lines[@]}" -gt 0 ] || exit 0
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# Report new failures and advance the watermark to the newest line.
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printf '%s\n' "${new_lines[@]}"
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printf '%s\n' "${failed[-1]}" > "$WATERMARK"
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exit 1
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