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https://github.com/samuelncui/yatm.git
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40 lines
1.0 KiB
Bash
Executable File
40 lines
1.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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mt -f "${DEVICE}" load
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deadline=$(($(date +%s) + 60))
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while true; do
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now=$(date +%s)
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if ((now >= deadline)); then
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break
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fi
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remaining=$((deadline - now))
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if info=$(timeout "${remaining}s" ./yatm-lto-info -f "${DEVICE}"); then
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# A present, empty field is readable MAM without an assigned barcode.
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# The prefix distinguishes it from a missing field or failed probe.
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barcode=$(awk '$1 == "Barcode" && $2 == ":" {
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value = $3
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if (length(value) == 8) {
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value = substr(value, 1, 6)
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}
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print ":" value
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exit
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}' <<< "${info}")
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if [[ -n ${barcode} ]]; then
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printf '{"barcode":"%s"}\n' "${barcode#:}" > "${OUT}"
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exit 0
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fi
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fi
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now=$(date +%s)
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if ((now >= deadline)); then
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break
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fi
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delay=$((deadline - now))
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if ((delay > 2)); then
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delay=2
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fi
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sleep "${delay}"
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done
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echo "Tape barcode is unavailable: ${DEVICE}" >&2
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exit 1
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