564 lines
13 KiB
Bash
Executable file
564 lines
13 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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# 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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VERSION="0.9"
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RELEASE="2013-09-XX"
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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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# unset values
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#
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PARALLEL=""
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USE_ALL=""
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#
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# catch signals
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#
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trap "rm -f \"${TMP}\"" 1 2 15
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#
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# Functions
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#
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# time displaying echo
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_techo()
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{
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echo "$(${DDATE}): $@"
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}
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# exit on error
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_exit_err()
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{
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_techo "$@"
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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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-p, --parallel: Parallelise backup processes
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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 ${RELEASE}.
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Retrieve latest ccollect at http://www.nico.schottelius.org/software/ccollect/
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eof
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exit 0
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}
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#
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# Parse options
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#
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while [ "$#" -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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PARALLEL=1
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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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#
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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 "${CPREEXEC} failed. Aborting"
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fi
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################################################################################
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#
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# Let's do the backup - here begins the real stuff
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#
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source_no=0
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while [ "${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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"$0" "${INTERVAL}" "${name}" &
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continue
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fi
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#
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# Start subshell for easy log editing
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#
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(
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backup="${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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# 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 < "${c_rsync_options}"
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fi
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#
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# Check: source is up and accepting connections (before deleting old backups!)
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#
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if ! rsync "$@" "${source}" >/dev/null 2>"${TMP}" ; then
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if [ ! -f "${c_quiet_if_down}" ]; then
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cat "${TMP}"
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fi
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_exit_err "Source ${source} is not readable. Skipping."
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fi
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#
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# Add --archive for real backup (looks nice in front)
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#
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set -- "--archive" "$@"
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#
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# Check: destination exists?
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#
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cd "${ddir}" || _exit_err "Cannot change to ${ddir}. Skipping."
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#
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# Check incomplete backups (needs echo to remove newlines)
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#
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ls -1 | grep "${CMARKER}\$" > "${TMP}"; ret=$?
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if [ "$ret" -eq 0 ]; then
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_techo "Incomplete backups: $(echo $(cat "${TMP}"))"
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if [ -f "${c_delete_incomplete}" ]; then
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delete_from_file "${TMP}" "${CMARKER}"
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fi
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fi
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#
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# Check: maximum number of backups is reached?
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#
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count="$(ls -1 | grep -c "^${INTERVAL}\\.")"
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_techo "Existing backups: ${count} Total keeping backups: ${c_interval}"
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if [ "${count}" -ge "${c_interval}" ]; then
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remove="$((${count} - ${c_interval} + 1))"
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_techo "Removing ${remove} backup(s)..."
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ls -${TSORT}1r | grep "^${INTERVAL}\\." | head -n "${remove}" > "${TMP}" || \
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_exit_err "Listing old backups failed"
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delete_from_file "${TMP}"
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fi
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#
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# Check for backup directory to clone from: Always clone from the latest one!
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#
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last_dir="$(ls -${TSORT}p1 | grep '/$' | head -n 1)" || \
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_exit_err "Failed to list contents of ${ddir}."
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#
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# Clone from old backup, if existing
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#
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if [ "${last_dir}" ]; then
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set -- "$@" "--link-dest=${ddir}/${last_dir}"
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_techo "Hard linking from ${last_dir}"
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fi
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#
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# Include current time in name, not the time when we began to remove above
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#
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export destination_name="${INTERVAL}.$(${CDATE}).$$-${source_no}"
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export destination_dir="${ddir}/${destination_name}"
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#
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# Mark backup running and go back to original directory
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#
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touch "${destination_dir}${CMARKER}"
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cd "${__abs_mydir}" || _exit_err "Cannot go back to ${__abs_mydir}."
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#
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# the rsync part
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#
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_techo "Transferring files..."
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rsync "$@" "${source}" "${destination_dir}"; ret=$?
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_techo "Finished backup (rsync return code: $ret)."
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#
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# Set modification time (mtime) to current time, if sorting by mtime is enabled
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#
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[ -f "$c_mtime" ] && touch "${destination_dir}"
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#
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# Check if rsync exit code indicates failure.
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#
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fail=""
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if [ -f "$c_rsync_failure_codes" ]; then
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while read code ; do
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if [ "$ret" = "$code" ]; then
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fail=1
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fi
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done <"${c_rsync_failure_codes}"
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fi
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#
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# Remove marking here unless rsync failed.
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#
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if [ -z "$fail" ]; then
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rm "${destination_dir}${CMARKER}" || \
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_exit_err "Removing ${destination_dir}${CMARKER} failed."
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if [ "${ret}" -ne 0 ]; then
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_techo "Warning: rsync exited non-zero, the backup may be broken (see rsync errors)."
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fi
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else
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_techo "Warning: rsync failed with return code $ret."
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fi
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#
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# post_exec
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#
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if [ -x "${c_post_exec}" ]; then
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_techo "Executing ${c_post_exec} ..."
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"${c_post_exec}"; ret=$?
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_techo "Finished ${c_post_exec}."
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if [ "${ret}" -ne 0 ]; then
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_exit_err "${c_post_exec} failed."
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fi
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fi
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#
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# Time calculation
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#
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end_s="$(${SDATE})"
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full_seconds="$((${end_s} - ${begin_s}))"
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hours="$((${full_seconds} / 3600))"
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minutes="$(((${full_seconds} % 3600) / 60))"
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seconds="$((${full_seconds} % 60))"
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_techo "Backup lasted: ${hours}:${minutes}:${seconds} (h:m:s)"
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) | add_name
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done
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#
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# Be a good parent and wait for our children, if they are running wild parallel
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#
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if [ "${PARALLEL}" ]; then
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_techo "Waiting for children to complete..."
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wait
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fi
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#
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# Look for post-exec command (general)
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#
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if [ -x "${CPOSTEXEC}" ]; then
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_techo "Executing ${CPOSTEXEC} ..."
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"${CPOSTEXEC}"; ret=$?
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_techo "Finished ${CPOSTEXEC} (return code: ${ret})."
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if [ "${ret}" -ne 0 ]; then
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_techo "${CPOSTEXEC} failed."
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fi
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fi
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rm -f "${TMP}"
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_techo "Finished"
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