748 lines
18 KiB
Bash
Executable file
748 lines
18 KiB
Bash
Executable file
#!/bin/sh
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#
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# 2005-2013 Nico Schottelius (nico-ccollect at schottelius.org)
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#
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# This file is part of ccollect.
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#
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# ccollect is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# ccollect is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with ccollect. If not, see <http://www.gnu.org/licenses/>.
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#
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# Initially written for SyGroup (www.sygroup.ch)
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# Date: Mon Nov 14 11:45:11 CET 2005
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# Simulate ccollect without actually performing any backup;
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# conf directory need to be specifed.
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# Usually used for debugging/testing locking and parallel execution.
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SIMULATE="1"
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# Error upon expanding unset variables:
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set -u
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#
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# Standard variables (stolen from cconf)
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#
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__pwd="$(pwd -P)"
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__mydir="${0%/*}"; __abs_mydir="$(cd "$__mydir" && pwd -P)"
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__myname=${0##*/}; __abs_myname="$__abs_mydir/$__myname"
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#
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# where to find our configuration and temporary file
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#
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CCOLLECT_CONF="${CCOLLECT_CONF:-/etc/ccollect}"
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CSOURCES="${CCOLLECT_CONF}/sources"
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CDEFAULTS="${CCOLLECT_CONF}/defaults"
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CPREEXEC="${CDEFAULTS}/pre_exec"
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CPOSTEXEC="${CDEFAULTS}/post_exec"
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CMARKER=".ccollect-marker"
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export TMP="$(mktemp "/tmp/${__myname}.XXXXXX")"
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CONTROL_PIPE="/tmp/${__myname}-control-pipe"
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VERSION="1.0"
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RELEASE="2015-10-10"
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HALF_VERSION="ccollect ${VERSION}"
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FULL_VERSION="ccollect ${VERSION} (${RELEASE})"
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#
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# CDATE: how we use it for naming of the archives
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# DDATE: how the user should see it in our output (DISPLAY)
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#
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CDATE="date +%Y%m%d-%H%M"
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DDATE="date +%Y-%m-%d-%H:%M:%S"
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SDATE="date +%s"
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#
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# LOCKING: use flock if available, otherwise mkdir
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# Locking is done for each source so that only one instance per source
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# can run.
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#
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# Use CCOLLECT_CONF directory for lock files.
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# This directory can be set arbitrary so it is writable for user
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# executing ccollect.
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LOCKDIR="${CCOLLECT_CONF}"
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# printf pattern: ccollect_<source>.lock
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LOCKFILE_PATTERN="ccollect_%s.lock"
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LOCKFD=4
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#
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# locking functions using flock
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#
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lock_flock()
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{
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# $1 = source to backup
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lockfile="${LOCKDIR}/$(printf "${LOCKFILE_PATTERN}" "$1")"
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eval "exec ${LOCKFD}> ${lockfile}"
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flock -n ${LOCKFD} && return 0 || return 1
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}
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unlock_flock()
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{
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# $1 = source to backup
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lockfile="${LOCKDIR}/$(printf "${LOCKFILE_PATTERN}" "$1")"
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eval "exec ${LOCKFD}>&-"
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rm -f "${lockfile}"
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}
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#
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# locking functions using mkdir (mkdir is atomic)
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#
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lock_mkdir()
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{
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# $1 = source to backup
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lockfile="${LOCKDIR}/$(printf "${LOCKFILE_PATTERN}" "$1")"
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mkdir "${lockfile}" && return 0 || return 1
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}
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unlock_mkdir()
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{
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# $1 = source to backup
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lockfile="${LOCKDIR}/$(printf "${LOCKFILE_PATTERN}" "$1")"
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rmdir "${lockfile}"
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}
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#
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# determine locking tool: flock or mkdir
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#
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if $(which flock > /dev/null 2>&1)
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then
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lockf="lock_flock"
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unlockf="unlock_flock"
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else
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lockf="lock_mkdir"
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unlockf="unlock_mkdir"
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fi
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#
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# unset values
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#
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PARALLEL=""
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MAX_JOBS=""
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USE_ALL=""
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#
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# catch signals
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#
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TRAPFUNC="rm -f \"${TMP}\""
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trap "${TRAPFUNC}" 1 2 15
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#
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# Functions
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#
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# time displaying echo
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_techo()
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{
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echo "$(${DDATE}): $@"
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}
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# exit on error
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_exit_err()
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{
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_techo "Error: $@"
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rm -f "${TMP}"
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exit 1
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}
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add_name()
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{
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awk "{ print \"[${name}] \" \$0 }"
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}
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#
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# ssh-"feature": we cannot do '... read ...; ssh ...; < file',
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# because ssh reads stdin! -n does not work -> does not ask for password
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# Also allow deletion for files without the given suffix
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#
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delete_from_file()
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{
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file="$1"; shift
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suffix="" # It will be set, if deleting incomplete backups.
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[ $# -eq 1 ] && suffix="$1" && shift
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while read to_remove; do
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set -- "$@" "${to_remove}"
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if [ "${suffix}" ]; then
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to_remove_no_suffix="$(echo ${to_remove} | sed "s/$suffix\$//")"
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set -- "$@" "${to_remove_no_suffix}"
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fi
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done < "${file}"
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_techo "Removing $@ ..."
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[ "${VVERBOSE}" ] && echo rm "$@"
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rm -rf "$@" || _exit_err "Removing $@ failed."
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}
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display_version()
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{
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echo "${FULL_VERSION}"
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exit 0
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}
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usage()
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{
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cat << eof
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${__myname}: [args] <interval name> <sources to backup>
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ccollect creates (pseudo) incremental backups
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-h, --help: Show this help screen
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-a, --all: Backup all sources specified in ${CSOURCES}
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-j [max], --jobs [max] Specifies the number of jobs to run simultaneously.
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If max is not specified then parallelise all jobs.
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-p, --parallel: Parallelise backup processes (deprecated from 2.0)
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-v, --verbose: Be very verbose (uses set -x)
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-V, --version: Print version information
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This is version ${VERSION} released on ${RELEASE}.
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Retrieve latest ccollect at http://www.nico.schottelius.org/software/ccollect/
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eof
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exit 0
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}
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# locking functions
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lock()
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{
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"${lockf}" "$@" || _exit_err \
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"Only one instance of ${__myname} for source \"$1\" can run at one time."
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}
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unlock()
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{
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"${unlockf}" "$@"
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}
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#
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# Parse options
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#
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while [ "$#" -ge 1 ]; do
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case "$1" in
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-a|--all)
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USE_ALL=1
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;;
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-p|--parallel)
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_techo "Warning: -p, --parallel option is deprecated," \
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"use -j, --jobs instead."
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PARALLEL=1
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MAX_JOBS=""
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;;
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-j|--jobs)
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PARALLEL=1
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if [ "$#" -ge 2 ]
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then
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case "$2" in
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-*)
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;;
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*)
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MAX_JOBS=$2
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shift
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;;
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esac
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fi
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;;
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-v|--verbose)
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set -x
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;;
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-V|--version)
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display_version
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;;
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--)
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# ignore the -- itself
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shift
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break
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;;
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-h|--help|-*)
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usage
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;;
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*)
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break
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;;
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esac
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shift
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done
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# check that MAX_JOBS is natural number > 0
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# empty string means run all in parallel
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echo "${MAX_JOBS}" | awk '/^$/ { exit 0 } /^[1-9][0-9]*$/ { exit 0 } { exit 1 }'
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if [ "$?" -ne 0 ]
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then
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_exit_err "Invalid max jobs value \"${MAX_JOBS}\""
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fi
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#
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# Setup interval
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#
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if [ $# -ge 1 ]; then
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export INTERVAL="$1"
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shift
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else
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usage
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fi
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#
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# Check for configuraton directory
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#
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[ -d "${CCOLLECT_CONF}" ] || _exit_err "No configuration found in " \
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"\"${CCOLLECT_CONF}\" (is \$CCOLLECT_CONF properly set?)"
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#
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# Create (portable!) source "array"
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#
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export no_sources=0
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if [ "${USE_ALL}" = 1 ]; then
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#
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# Get sources from source configuration
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#
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( cd "${CSOURCES}" && ls -1 > "${TMP}" ) || \
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_exit_err "Listing of sources failed. Aborting."
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while read tmp; do
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eval export source_${no_sources}=\"${tmp}\"
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no_sources=$((${no_sources}+1))
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done < "${TMP}"
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else
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#
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# Get sources from command line
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#
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while [ "$#" -ge 1 ]; do
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eval arg=\"\$1\"; shift
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eval export source_${no_sources}=\"${arg}\"
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no_sources="$((${no_sources}+1))"
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done
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fi
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#
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# Need at least ONE source to backup
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#
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if [ "${no_sources}" -lt 1 ]; then
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usage
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else
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_techo "${HALF_VERSION}: Beginning backup using interval ${INTERVAL}"
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fi
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#
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# Look for pre-exec command (general)
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#
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if [ -x "${CPREEXEC}" ]; then
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_techo "Executing ${CPREEXEC} ..."
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"${CPREEXEC}"; ret=$?
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_techo "Finished ${CPREEXEC} (return code: ${ret})."
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[ "${ret}" -eq 0 ] || _exit_err "${CPREEXEC} failed. Aborting"
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fi
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################################################################################
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#
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# Let's do the backup - here begins the real stuff
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#
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# in PARALLEL mode:
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# * create control pipe
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# * determine number of jobs to start at once
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if [ "${PARALLEL}" ]; then
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mkfifo "${CONTROL_PIPE}"
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# fd 5 is tied to control pipe
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eval "exec 5<>${CONTROL_PIPE}"
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TRAPFUNC="${TRAPFUNC}; rm -f \"${CONTROL_PIPE}\""
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trap "${TRAPFUNC}" 0 1 2 15
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# determine how much parallel jobs to prestart
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if [ "${MAX_JOBS}" ] && [ "${MAX_JOBS}" -le "${no_sources}" ]
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then
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prestart="${MAX_JOBS}"
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else
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prestart=0
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fi
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fi
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source_no=0
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while [ "${source_no}" -lt "${no_sources}" ]; do
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#
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# Get current source
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#
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eval export name=\"\$source_${source_no}\"
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source_no=$((${source_no}+1))
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#
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# Start ourself, if we want parallel execution
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#
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if [ "${PARALLEL}" ]; then
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if [ "${SIMULATE}" ]
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then
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# give some time to awk's srand initialized by curr time
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sleep 1
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fi
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if [ ! "${MAX_JOBS}" ]
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then
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# run all in parallel
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"$0" "${INTERVAL}" "${name}" &
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continue
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elif [ "${prestart}" -gt 0 ]
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then
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# run prestart child if pending
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{ "$0" "${INTERVAL}" "${name}"; printf '\n' >&5; } &
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prestart=$((${prestart} - 1))
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continue
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else
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# each time a child finishes we get a line from the pipe
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# and then launch another child
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while read line
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do
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{ "$0" "${INTERVAL}" "${name}"; printf '\n' >&5; } &
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# get out of loop so we can contnue with main loop
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# for next source
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break
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done <&5
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continue
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fi
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fi
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#
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# Start subshell for easy log editing
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#
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(
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backup="${CSOURCES}/${name}"
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c_source="${backup}/source"
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c_dest="${backup}/destination"
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c_pre_exec="${backup}/pre_exec"
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c_post_exec="${backup}/post_exec"
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#
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# Stderr to stdout, so we can produce nice logs
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#
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exec 2>&1
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#
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# Record start of backup: internal and for the user
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#
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begin_s="$(${SDATE})"
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_techo "Beginning to backup"
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#
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# Standard configuration checks
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#
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if [ ! -e "${backup}" ]; then
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_exit_err "Source does not exist."
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fi
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#
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# Configuration _must_ be a directory (cconfig style)
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#
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if [ ! -d "${backup}" ]; then
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_exit_err "\"${backup}\" is not a cconfig-directory. Skipping."
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fi
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#
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# Acquire lock for source. If lock cannot be acquired, lock will exit
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# with error message.
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#
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lock "${name}"
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if [ "${SIMULATE}" ]
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then
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rand_low=3
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rand_high=10
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sleep_time=$(echo '' | awk "{srand(); print int(rand()*($rand_high - $rand_low)) + $rand_low;}")
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_techo "simulating backup for ${name}: ${sleep_time} secs ..."
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sleep $sleep_time
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unlock "${name}"
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_techo "Finished backup."
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break
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fi
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# redefine trap to also unlock (rm lockfile)
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TRAPFUNC="${TRAPFUNC}; unlock \"${name}\""
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trap "${TRAPFUNC}" 1 2 15
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#
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# First execute pre_exec, which may generate destination or other parameters
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#
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if [ -x "${c_pre_exec}" ]; then
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_techo "Executing ${c_pre_exec} ..."
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"${c_pre_exec}"; ret="$?"
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_techo "Finished ${c_pre_exec} (return code ${ret})."
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[ "${ret}" -eq 0 ] || _exit_err "${c_pre_exec} failed. Skipping."
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fi
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#
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# Read source configuration
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#
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for opt in verbose very_verbose summary exclude rsync_options \
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delete_incomplete rsync_failure_codes \
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mtime quiet_if_down ; do
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if [ -f "${backup}/${opt}" -o -f "${backup}/no_${opt}" ]; then
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eval c_$opt=\"${backup}/$opt\"
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else
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eval c_$opt=\"${CDEFAULTS}/$opt\"
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fi
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done
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#
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# Interval definition: First try source specific, fallback to default
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#
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c_interval="$(cat "${backup}/intervals/${INTERVAL}" 2>/dev/null)"
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if [ -z "${c_interval}" ]; then
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c_interval="$(cat "${CDEFAULTS}/intervals/${INTERVAL}" 2>/dev/null)"
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if [ -z "${c_interval}" ]; then
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_exit_err "No definition for interval \"${INTERVAL}\" found. Skipping."
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fi
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fi
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#
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# Sort by ctime (default) or mtime (configuration option)
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#
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if [ -f "${c_mtime}" ] ; then
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TSORT="t"
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else
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TSORT="tc"
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fi
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#
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# Source configuration checks
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#
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if [ ! -f "${c_source}" ]; then
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_exit_err "Source description \"${c_source}\" is not a file. Skipping."
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else
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source=$(cat "${c_source}"); ret="$?"
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if [ "${ret}" -ne 0 ]; then
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_exit_err "Source ${c_source} is not readable. Skipping."
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fi
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fi
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#
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# Destination is a path
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#
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if [ ! -f "${c_dest}" ]; then
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_exit_err "Destination ${c_dest} is not a file. Skipping."
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else
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ddir="$(cat "${c_dest}")"; ret="$?"
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if [ "${ret}" -ne 0 ]; then
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_exit_err "Destination ${c_dest} is not readable. Skipping."
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fi
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fi
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#
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# Parameters: ccollect defaults, configuration options, user options
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#
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#
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# Rsync standard options (archive will be added after is-up-check)
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#
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set -- "$@" "--delete" "--numeric-ids" "--relative" \
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"--delete-excluded" "--sparse"
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#
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# Exclude list
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#
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if [ -f "${c_exclude}" ]; then
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set -- "$@" "--exclude-from=${c_exclude}"
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fi
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#
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# Output a summary
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#
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if [ -f "${c_summary}" ]; then
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set -- "$@" "--stats"
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fi
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#
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# Verbosity for rsync, rm, and mkdir
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#
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VVERBOSE=""
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if [ -f "${c_very_verbose}" ]; then
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set -- "$@" "-vv"
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VVERBOSE="-v"
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elif [ -f "${c_verbose}" ]; then
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set -- "$@" "-v"
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fi
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#
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# Extra options for rsync provided by the user
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#
|
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if [ -f "${c_rsync_options}" ]; then
|
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while read line; do
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set -- "$@" "${line}"
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done < "${c_rsync_options}"
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fi
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#
|
|
# Check: source is up and accepting connections (before deleting old backups!)
|
|
#
|
|
if ! rsync "$@" "${source}" >/dev/null 2>"${TMP}" ; then
|
|
if [ ! -f "${c_quiet_if_down}" ]; then
|
|
cat "${TMP}"
|
|
fi
|
|
_exit_err "Source ${source} is not readable. Skipping."
|
|
fi
|
|
|
|
#
|
|
# Add --archive for real backup (looks nice in front)
|
|
#
|
|
set -- "--archive" "$@"
|
|
|
|
#
|
|
# Check: destination exists?
|
|
#
|
|
cd "${ddir}" || _exit_err "Cannot change to ${ddir}. Skipping."
|
|
|
|
#
|
|
# Check incomplete backups (needs echo to remove newlines)
|
|
#
|
|
ls -1 | grep "${CMARKER}\$" > "${TMP}"; ret=$?
|
|
|
|
if [ "$ret" -eq 0 ]; then
|
|
_techo "Incomplete backups: $(echo $(cat "${TMP}"))"
|
|
if [ -f "${c_delete_incomplete}" ]; then
|
|
delete_from_file "${TMP}" "${CMARKER}"
|
|
fi
|
|
fi
|
|
|
|
#
|
|
# Check: maximum number of backups is reached?
|
|
#
|
|
count="$(ls -1 | grep -c "^${INTERVAL}\\.")"
|
|
|
|
_techo "Existing backups: ${count} Total keeping backups: ${c_interval}"
|
|
|
|
if [ "${count}" -ge "${c_interval}" ]; then
|
|
remove="$((${count} - ${c_interval} + 1))"
|
|
_techo "Removing ${remove} backup(s)..."
|
|
|
|
ls -${TSORT}1r | grep "^${INTERVAL}\\." | head -n "${remove}" > "${TMP}" || \
|
|
_exit_err "Listing old backups failed"
|
|
|
|
delete_from_file "${TMP}"
|
|
fi
|
|
|
|
#
|
|
# Check for backup directory to clone from: Always clone from the latest one!
|
|
#
|
|
last_dir="$(ls -${TSORT}p1 | grep '/$' | head -n 1)" || \
|
|
_exit_err "Failed to list contents of ${ddir}."
|
|
|
|
#
|
|
# Clone from old backup, if existing
|
|
#
|
|
if [ "${last_dir}" ]; then
|
|
set -- "$@" "--link-dest=${ddir}/${last_dir}"
|
|
_techo "Hard linking from ${last_dir}"
|
|
fi
|
|
|
|
#
|
|
# Include current time in name, not the time when we began to remove above
|
|
#
|
|
export destination_name="${INTERVAL}.$(${CDATE}).$$-${source_no}"
|
|
export destination_dir="${ddir}/${destination_name}"
|
|
|
|
#
|
|
# Mark backup running and go back to original directory
|
|
#
|
|
touch "${destination_dir}${CMARKER}"
|
|
cd "${__abs_mydir}" || _exit_err "Cannot go back to ${__abs_mydir}."
|
|
|
|
#
|
|
# the rsync part
|
|
#
|
|
_techo "Transferring files..."
|
|
rsync "$@" "${source}" "${destination_dir}"; ret=$?
|
|
_techo "Finished backup (rsync return code: $ret)."
|
|
|
|
#
|
|
# Set modification time (mtime) to current time, if sorting by mtime is enabled
|
|
#
|
|
[ -f "$c_mtime" ] && touch "${destination_dir}"
|
|
|
|
#
|
|
# Check if rsync exit code indicates failure.
|
|
#
|
|
fail=""
|
|
if [ -f "$c_rsync_failure_codes" ]; then
|
|
while read code ; do
|
|
if [ "$ret" = "$code" ]; then
|
|
fail=1
|
|
fi
|
|
done <"${c_rsync_failure_codes}"
|
|
fi
|
|
|
|
#
|
|
# Remove marking here unless rsync failed.
|
|
#
|
|
if [ -z "$fail" ]; then
|
|
rm "${destination_dir}${CMARKER}" || \
|
|
_exit_err "Removing ${destination_dir}${CMARKER} failed."
|
|
if [ "${ret}" -ne 0 ]; then
|
|
_techo "Warning: rsync exited non-zero, the backup may be broken (see rsync errors)."
|
|
fi
|
|
else
|
|
_techo "Warning: rsync failed with return code $ret."
|
|
fi
|
|
|
|
#
|
|
# post_exec
|
|
#
|
|
if [ -x "${c_post_exec}" ]; then
|
|
_techo "Executing ${c_post_exec} ..."
|
|
"${c_post_exec}"; ret=$?
|
|
_techo "Finished ${c_post_exec}."
|
|
|
|
if [ "${ret}" -ne 0 ]; then
|
|
_exit_err "${c_post_exec} failed."
|
|
fi
|
|
fi
|
|
|
|
#
|
|
# Time calculation
|
|
#
|
|
end_s="$(${SDATE})"
|
|
full_seconds="$((${end_s} - ${begin_s}))"
|
|
hours="$((${full_seconds} / 3600))"
|
|
minutes="$(((${full_seconds} % 3600) / 60))"
|
|
seconds="$((${full_seconds} % 60))"
|
|
|
|
_techo "Backup lasted: ${hours}:${minutes}:${seconds} (h:m:s)"
|
|
|
|
unlock "${name}"
|
|
) | add_name
|
|
done
|
|
|
|
#
|
|
# Be a good parent and wait for our children, if they are running wild parallel
|
|
# After all children are finished then remove control pipe.
|
|
#
|
|
if [ "${PARALLEL}" ]; then
|
|
_techo "Waiting for children to complete..."
|
|
wait
|
|
rm -f "${CONTROL_PIPE}"
|
|
fi
|
|
|
|
#
|
|
# Look for post-exec command (general)
|
|
#
|
|
if [ -x "${CPOSTEXEC}" ]; then
|
|
_techo "Executing ${CPOSTEXEC} ..."
|
|
"${CPOSTEXEC}"; ret=$?
|
|
_techo "Finished ${CPOSTEXEC} (return code: ${ret})."
|
|
|
|
if [ "${ret}" -ne 0 ]; then
|
|
_techo "${CPOSTEXEC} failed."
|
|
fi
|
|
fi
|
|
|
|
rm -f "${TMP}"
|
|
_techo "Finished"
|