47 lines
1.3 KiB
Bash
Executable File
47 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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# Reads stdin and periodically report the most recently seen output.
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#
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# Copyright (C) 2019 Peter Wu <peter@lekensteyn.nl>
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Like "travis_wait", it prevents a build timeout due to lack of progress.
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# Additionally:
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# - During execution it reports the most recent line instead of some fixed text.
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# - It does not write the full output at the end of execution.
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# - It does not impose a command timeout.
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set -eu
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# Default to a 60 seconds interval between printing messages.
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PERIOD=${1:-60}
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nexttime=$PERIOD
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msg=
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count=0
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# Reset timer (SECONDS is a special Bash variable).
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SECONDS=0
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while true; do
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# Periodically report the last read line.
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timeleft=$((nexttime-SECONDS))
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while [ $timeleft -le 0 ]; do
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((nexttime+=PERIOD))
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((timeleft+=PERIOD))
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printf "[progress] %3d %s\n" $SECONDS "${msg:-(no output)}"
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msg=
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done
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if read -r -t $timeleft line; then
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# Save line for later.
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((count+=1))
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msg="Line $count: $line"
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continue
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elif [ $? -le 128 ]; then
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# EOF (as opposed to a timeout)
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[ -z "$msg" ] || printf "[progress] %3d %s\n" $SECONDS "$msg"
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printf "[progress] %3d done (read %d lines).\n" $SECONDS $count
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break
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fi
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done
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