99f2d95aa1
Removed some output that previously appeared when dirdedupe was
run without the --execute flag. This output was intended to help
debug and verify atime/mtime preservation, and is no longer needed.
110 lines
4.1 KiB
Bash
Executable File
110 lines
4.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright (c) 2023 Joshua Lee Ockert <torstenvl@gmail.com>
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#
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# THIS WORK IS PROVIDED "AS IS" WITH NO WARRANTY OF ANY KIND. THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY, FITNESS, NON-INFRINGEMENT, AND TITLE ARE
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# EXPRESSLY DISCLAIMED. NO AUTHOR SHALL BE LIABLE UNDER ANY THEORY OF LAW
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# FOR ANY DAMAGES OF ANY KIND RESULTING FROM THE USE OF THIS WORK.
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#
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# Permission to use, copy, modify, and/or distribute this work for any
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# purpose is hereby granted, provided this notice appears in all copies.
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#
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# SPDX-License-Identifier: ISC
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############################################################################
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## FUNCTION TO PRINT USAGE INSTRUCTIONS ##
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############################################################################
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printusage() {
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echo "
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DIRECTORY DE-DUPLICATOR
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USAGE
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dirdedupe.sh [--execute] masterdir subjectdir
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DESCRIPTION
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For each file in subjectdir, replace it with a hard link to the matching
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file (if any) in masterdir. A file will be considered a match if, and
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only if, it shares the same file name, relative path, and contents.
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OPTIONS
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--execute Actually remove and link duplicate files. By default, this
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program runs in test mode.
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"
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}
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############################################################################
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## PARSE & MAKE SENSE OF COMMAND LINE ##
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############################################################################
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# CHECK FOR THE EXECUTE FLAG (DEFAULT IS TESTING-ONLY MODE)
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REALLYRUN=0
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if [ "${1}" == "--execute" ]; then
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REALLYRUN=1
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shift
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fi
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# MAKE SURE WE HAVE THE RIGHT NUMBER OF ARGUMENTS AND THEY'RE VALID
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if [ ! $# -eq 2 ]; then
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echo && echo "Wrong number of arguments!" && printusage && exit
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else
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masterdir=$1
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subjectdir=$2
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if [ ! -d "${masterdir}" ]; then
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echo && echo "${masterdir} is not a directory!" && printusage && exit
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elif [ ! -d "${subjectdir}" ]; then
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echo && echo "${subjectdir} is not a directory!" && printusage && exit
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fi
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fi
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############################################################################
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## MAKE A TEMPORARY FILE FOR PRESERVING TIMESTAMPS ##
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############################################################################
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TEMPFILE=$(mktemp)
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trap "rm -f ${TEMPFILE}" EXIT
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############################################################################
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## HARDLINK THE DUPLICATES (OR NOT) ##
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############################################################################
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find "${subjectdir}" -print0 | while read -d $'\0' subjectfile
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do
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if [ -f "${subjectfile}" ]; then
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masterfile="${subjectfile/#${subjectdir}/${masterdir}}"
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if [ -f "${masterfile}" ]; then
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if [ ! "${subjectfile}" -ef "${masterfile}" ]; then
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cmp -s "${masterfile}" "${subjectfile}"
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if [ $? -eq 0 ]; then
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if [ $REALLYRUN -gt 0 ]; then
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echo "LINK \"${masterfile}\" <-- \"${subjectfile}\""
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# Store the mtime/atime of subject file's directory
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TEMPSUBJDIR=`dirname "${subjectfile}"`
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touch -r "${TEMPSUBJDIR}" "${TEMPFILE}"
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# Link the subject file to the corresponding file in
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# the master directory
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ln -Pf "${masterfile}" "${subjectfile}"
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# Restore the mtime/atime of subject file's directory
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touch -r "${TEMPFILE}" "${TEMPSUBJDIR}"
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else
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echo "HYPO \"${masterfile}\" <~~ \"${subjectfile}\""
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fi
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#else
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#echo "MOD \"${masterfile}\" <X> \"${subjectfile}\""
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fi #END check for files being the same
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#else
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#echo "ID \"${masterfile}\" <-> \"${subjectfile}\""
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fi # END check for inode equality
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#else
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#echo "NEW \"${subjectfile}\" "
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fi # END check if master file exists
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fi
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done
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exit
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