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metaphox/sleep_until_modified.sh

Created February 21, 2017 17:03
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  1. metaphox created this gist Feb 21, 2017.
    59 changes: 59 additions & 0 deletions sleep_until_modified.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/bin/bash

    SCRIPTNAME=`basename "$0"`

    print_help() {
    cat << EOF
    Usage: $SCRIPTNAME filename
    Uses 'inotifywait' to sleep until 'filename' has been modified.
    Inspired by http://superuser.com/questions/181517/how-to-execute-a-command-whenever-a-file-changes/181543#181543
    TODO: rewrite this as a simple Python script, using pyinotify
    EOF
    }

    # check dependencies
    if ! type inotifywait &>/dev/null ; then
    echo "You are missing the inotifywait dependency. Install the package inotify-tools (apt-get install inotify-tools)"
    exit 1
    fi

    # parse_parameters:
    while [[ "$1" == -* ]] ; do
    case "$1" in
    -h|-help|--help)
    print_help
    exit
    ;;
    --)
    #echo "-- found"
    shift
    break
    ;;
    *)
    echo "Invalid parameter: '$1'"
    exit 1
    ;;
    esac
    done

    if [ "$#" != 1 ] ; then
    echo "Incorrect parameters. Use --help for usage instructions."
    exit 1
    fi

    FULLNAME="$1"
    BASENAME=`basename "$FULLNAME"`
    DIRNAME=`dirname "$FULLNAME"`

    coproc INOTIFY {
    inotifywait -q -m -e close_write,moved_to,create ${DIRNAME} &
    trap "kill $!" 1 2 3 6 15
    wait
    }

    trap "kill $INOTIFY_PID" 0 1 2 3 6 15

    # BUG! Não vai funcionar com arquivos contendo caracteres estranhos
    sed --regexp-extended -n "/ (CLOSE_WRITE|MOVED_TO|CREATE)(,CLOSE)? ${BASENAME}\$/q" 0<&${INOTIFY[0]}