53 lines
1.6 KiB
Bash
Executable File
53 lines
1.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Archive all files in source directory into destination directory.
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set -euo pipefail
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# Parse command-line arguments.
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unset SRCDIR DESTDIR BASENAME
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while getopts 's:d:n:' arg; do
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case "${arg}" in
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s) SRCDIR="${OPTARG}" ;;
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d) DESTDIR="${OPTARG}" ;;
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n) BASENAME="${OPTARG}-" ;;
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*) echo "Unknown argument '${arg}' given. Exiting." >&2 && exit 1 ;;
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esac
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done
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# Check and return true if source files are newer than any archive already created.
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function archive-should-update() {
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local latest="${DESTDIR}/${BASENAME}latest.tar.gz"
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if ! test -e "${latest}"; then
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return 0
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elif test "$(find "${SRCDIR}" -type f -newer "${latest}" -print -quit | wc -l)" -gt 0; then
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return 0
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fi
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return 1
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}
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# Create compressed archive for source path into destination path for pre-defined, date-based name.
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function archive-create() {
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local name="${BASENAME}$(date +%w%H)"
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# Create uncompressed archive for source path and compress separately to ensure minimal blocking.
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tar --verbose --create --file "${DESTDIR}/${name}.tar" --directory "${SRCDIR}" .
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gzip --force "${DESTDIR}/${name}.tar"
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# Point the latest archive to a "special" name for future use.
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(cd /backup && ln --symbolic --force "${name}.tar.gz" "${BASENAME}latest.tar.gz")
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}
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# Entry-point for script. Create tar archive for source directory into destination directory, checking
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# for any changes since last run, and ensuring files are archived correctly for subsequent restore.
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function main() {
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if archive-should-update "${SRCDIR}" "${DESTDIR}"; then
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archive-create "${SRCDIR}" "${DESTDIR}"
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fi
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}
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main "$@"
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