130 lines
3.0 KiB
Bash
130 lines
3.0 KiB
Bash
#!/bin/sh
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PROGNAME="update-evobackup-canary"
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REPOSITORY="https://gitea.evolix.org/evolix/evobackup"
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VERSION="22.06"
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readonly VERSION
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# base functions
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show_version() {
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cat <<END
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${PROGNAME} version ${VERSION}
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Copyright 2022 Evolix <info@evolix.fr>,
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Jérémy Lecour <jlecour@evolix.fr>,
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and others.
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${REPOSITORY}
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${PROGNAME} comes with ABSOLUTELY NO WARRANTY. This is free software,
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and you are welcome to redistribute it under certain conditions.
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See the GNU General Public License v3.0 for details.
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END
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}
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show_help() {
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cat <<END
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${PROGNAME} is updating a canary file for evobackup.
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Usage: ${PROGNAME} [OPTIONS]
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Main options
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-w, --who who has updated the file (default: logname())
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-f, --file path of the canary file (default: /zzz_evobackup_canary)
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-V, --version print version and exit
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-h, --help print this message and exit
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END
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}
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main() {
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if [ -z "${who:-}" ]; then
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who=$(logname)
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fi
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if [ -z "${canary_file:-}" ]; then
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canary_file="/zzz_evobackup_canary"
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fi
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# This option is supported both on OpenBSD which does not use GNU date and on Debian
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date=$(date "+%FT%T%z")
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printf "%s %s\n" "${date}" "${who}" >> "${canary_file}"
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}
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# parse options
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# based on https://gist.github.com/deshion/10d3cb5f88a21671e17a
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while :; do
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case $1 in
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-h|-\?|--help)
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show_help
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exit 0
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;;
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-V|--version)
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show_version
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exit 0
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;;
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-w|--who)
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# with value separated by space
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if [ -n "$2" ]; then
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who=$2
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shift
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else
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printf 'ERROR: "-w|--who" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--who=?*)
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# with value speparated by =
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who=${1#*=}
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;;
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--who=)
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# without value
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printf 'ERROR: "--who" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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-f|--file)
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# with value separated by space
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if [ -n "$2" ]; then
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canary_file=$2
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shift
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else
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printf 'ERROR: "-f|--file" requires a non-empty option argument.\n' >&2
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exit 1
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fi
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;;
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--file=?*)
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# with value speparated by =
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canary_file=${1#*=}
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;;
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--file=)
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# without value
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printf 'ERROR: "--file" requires a non-empty option argument.\n' >&2
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exit 1
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;;
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--)
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# End of all options.
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shift
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break
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;;
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-?*)
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# ignore unknown options
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printf 'WARN: Unknown option : %s\n' "$1" >&2
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exit 1
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;;
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*)
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# Default case: If no more options then break out of the loop.
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break
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;;
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esac
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shift
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done
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export LC_ALL=C
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set -u
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main
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