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ccollect/ccollect.sh
Nico Schottelius 7e155f4219 prepare the next release 
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
2009-11-01 14:00:54 +01:00

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#!/bin/sh
#
# 2005-2009 Nico Schottelius (nico-ccollect at schottelius.org)
#
# This file is part of ccollect.
#
# ccollect is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ccollect is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with ccollect. If not, see <http://www.gnu.org/licenses/>.
#
# Initially written for SyGroup (www.sygroup.ch)
# Date: Mon Nov 14 11:45:11 CET 2005
# Error upon expanding unset variables:
set -u
#
# Standard variables (stolen from cconf)
#
__pwd="$(pwd -P)"
__mydir="${0%/*}"; __abs_mydir="$(cd "$__mydir" && pwd -P)"
__myname=${0##*/}; __abs_myname="$__abs_mydir/$__myname"
#
# where to find our configuration and temporary file
#
CCOLLECT_CONF="${CCOLLECT_CONF:-/etc/ccollect}"
CSOURCES="${CCOLLECT_CONF}/sources"
CDEFAULTS="${CCOLLECT_CONF}/defaults"
CPREEXEC="${CDEFAULTS}/pre_exec"
CPOSTEXEC="${CDEFAULTS}/post_exec"
CMARKER=".ccollect-marker"
export TMP="$(mktemp "/tmp/${__myname}.XXXXXX")"
VERSION="0.8.1"
RELEASE="2009-11-XX"
HALF_VERSION="ccollect ${VERSION}"
FULL_VERSION="ccollect ${VERSION} (${RELEASE})"
#
# CDATE: how we use it for naming of the archives
# DDATE: how the user should see it in our output (DISPLAY)
#
CDATE="date +%Y%m%d-%H%M"
DDATE="date +%Y-%m-%d-%H:%M:%S"
SDATE="date +%s"
#
# unset values
#
PARALLEL=""
USE_ALL=""
#
# catch signals
#
trap "rm -f \"${TMP}\"" 1 2 15
#
# Functions
#
# time displaying echo
_techo()
{
echo "$(${DDATE}): $@"
}
# exit on error
_exit_err()
{
_techo "$@"
rm -f "${TMP}"
exit 1
}
add_name()
{
awk "{ print \"[${name}] \" \$0 }"
}
#
# Execute on remote host, if backing up to a remote host
#
pcmd()
{
if [ "${remote_host}" ]; then
ssh "${remote_host}" "$@"
else
"$@"
fi
}
#
# ssh-"feature": we cannot do '... read ...; ssh ...; < file',
# because ssh reads stdin! -n does not work -> does not ask for password
# Alsa allow deletion for files without the given suffix
#
delete_from_file()
{
file="$1"; shift
suffix="" # It will be set, if deleting incomplete backups.
[ $# -eq 1 ] && suffix="$1" && shift
while read to_remove; do
set -- "$@" "${to_remove}"
if [ "$suffix" ]; then
to_remove_no_suffix="$(echo ${to_remove} | sed "s/$suffix\$//")"
set -- "$@" "${to_remove_no_suffix}"
fi
done < "${file}"
_techo "Removing $@ ..."
[ "${VVERBOSE}" ] && echo rm "$@"
pcmd rm -rf "$@" || _exit_err "Removing $@ failed."
}
display_version()
{
echo "${FULL_VERSION}"
exit 0
}
usage()
{
cat << eof
${__myname}: [args] <interval name> <sources to backup>
ccollect creates (pseudo) incremental backups
-h, --help: Show this help screen
-a, --all: Backup all sources specified in ${CSOURCES}
-p, --parallel: Parallelise backup processes
-v, --verbose: Be very verbose (uses set -x)
-V, --version: Print version information
This is version ${VERSION}, released on ${RELEASE}
(the first version was written on 2005-12-05 by Nico Schottelius).
Retrieve latest ccollect at http://www.nico.schottelius.org/software/ccollect/
eof
exit 0
}
#
# Parse options
#
while [ "$#" -ge 1 ]; do
case "$1" in
-a|--all)
USE_ALL=1
;;
-p|--parallel)
PARALLEL=1
;;
-v|--verbose)
set -x
;;
-V|--version)
display_version
;;
--)
# ignore the -- itself
shift
break
;;
-h|--help|-*)
usage
;;
*)
break
;;
esac
shift
done
#
# Setup interval
#
if [ $# -ge 1 ]; then
export INTERVAL="$1"
shift
else
usage
fi
#
# Check for configuraton directory
#
[ -d "${CCOLLECT_CONF}" ] || _exit_err "No configuration found in " \
"\"${CCOLLECT_CONF}\" (is \$CCOLLECT_CONF properly set?)"
#
# Create (portable!) source "array"
#
export no_sources=0
if [ "${USE_ALL}" = 1 ]; then
#
# Get sources from source configuration
#
( cd "${CSOURCES}" && ls -1 > "${TMP}" ) || \
_exit_err "Listing of sources failed. Aborting."
while read tmp; do
eval export source_${no_sources}=\"${tmp}\"
no_sources=$((${no_sources}+1))
done < "${TMP}"
else
#
# Get sources from command line
#
while [ "$#" -ge 1 ]; do
eval arg=\"\$1\"; shift
eval export source_${no_sources}=\"${arg}\"
no_sources="$((${no_sources}+1))"
done
fi
#
# Need at least ONE source to backup
#
if [ "${no_sources}" -lt 1 ]; then
usage
else
_techo "${HALF_VERSION}: Beginning backup using interval ${INTERVAL}"
fi
#
# Look for pre-exec command (general)
#
if [ -x "${CPREEXEC}" ]; then
_techo "Executing ${CPREEXEC} ..."
"${CPREEXEC}"; ret=$?
_techo "Finished ${CPREEXEC} (return code: ${ret})."
[ "${ret}" -eq 0 ] || _exit_err "${CPREEXEC} failed. Aborting"
fi
################################################################################
#
# Let's do the backup - here begins the real stuff
#
i=0
while [ "${i}" -lt "${no_sources}" ]; do
#
# Get current source
#
eval name=\"\$source_${i}\"
i=$((${i}+1))
export name
#
# Start ourself, if we want parallel execution
#
if [ "${PARALLEL}" ]; then
"$0" "${INTERVAL}" "${name}" &
continue
fi
#
# Start subshell for easy log editing
#
(
backup="${CSOURCES}/${name}"
#
# Stderr to stdout, so we can produce nice logs
#
exec 2>&1
#
# Record start of backup: internal and for the user
#
begin_s="$(${SDATE})"
_techo "Beginning to backup"
#
# Standard configuration checks
#
if [ ! -e "${backup}" ]; then
_exit_err "Source does not exist."
fi
#
# Configuration _must_ be a directory (cconfig style)
#
if [ ! -d "${backup}" ]; then
_exit_err "\"${backup}\" is not a cconfig-directory. Skipping."
fi
#
# Read / create configuration
#
c_source="${backup}/source"
c_dest="${backup}/destination"
c_pre_exec="${backup}/pre_exec"
c_post_exec="${backup}/post_exec"
for opt in verbose very_verbose summary exclude rsync_options \
delete_incomplete remote_host rsync_failure_codes \
mtime quiet_if_down ; do
if [ -f "${backup}/${opt}" -o -f "${backup}/no_${opt}" ]; then
eval c_$opt=\"${backup}/$opt\"
else
eval c_$opt=\"${CDEFAULTS}/$opt\"
fi
done
#
# Sort by ctime (default) or mtime (configuration option)
#
if [ -f "${c_mtime}" ] ; then
TSORT="t"
else
TSORT="tc"
fi
#
# First execute pre_exec, which may generate destination or other parameters
#
if [ -x "${c_pre_exec}" ]; then
_techo "Executing ${c_pre_exec} ..."
"${c_pre_exec}"; ret="$?"
_techo "Finished ${c_pre_exec} (return code ${ret})."
[ "${ret}" -eq 0 ] || _exit_err "${c_pre_exec} failed. Skipping."
fi
#
# Source configuration checks
#
if [ ! -f "${c_source}" ]; then
_exit_err "Source description \"${c_source}\" is not a file. Skipping."
else
source=$(cat "${c_source}"); ret="$?"
if [ "${ret}" -ne 0 ]; then
_exit_err "Source ${c_source} is not readable. Skipping."
fi
fi
#
# Destination is a path
#
if [ ! -f "${c_dest}" ]; then
_exit_err "Destination ${c_dest} is not a file. Skipping."
else
ddir="$(cat "${c_dest}")"; ret="$?"
if [ "${ret}" -ne 0 ]; then
_exit_err "Destination ${c_dest} is not readable. Skipping."
fi
fi
#
# Set pre-cmd, if we backup to a remote host.
#
if [ -f "${c_remote_host}" ]; then
remote_host="$(cat "${c_remote_host}")"; ret="$?"
if [ "${ret}" -ne 0 ]; then
_exit_err "Remote host file ${c_remote_host} is unreadable. Skipping."
fi
destination="${remote_host}:${ddir}"
else
remote_host=""
destination="${ddir}"
fi
export remote_host
#
# Parameters: ccollect defaults, configuration options, user options
#
#
# Rsync standard options
#
set -- "$@" "--archive" "--delete" "--numeric-ids" "--relative" \
"--delete-excluded" "--sparse"
#
# Exclude list
#
if [ -f "${c_exclude}" ]; then
set -- "$@" "--exclude-from=${c_exclude}"
fi
#
# Output a summary
#
if [ -f "${c_summary}" ]; then
set -- "$@" "--stats"
fi
#
# Verbosity for rsync, rm, and mkdir
#
VVERBOSE=""
if [ -f "${c_very_verbose}" ]; then
set -- "$@" "-vv"
VVERBOSE="-v"
elif [ -f "${c_verbose}" ]; then
set -- "$@" "-v"
fi
#
# Extra options for rsync provided by the user
#
if [ -f "${c_rsync_options}" ]; then
while read line; do
set -- "$@" "${line}"
done < "${c_rsync_options}"
fi
#
# 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 ${source} is not readable. Skipping."
fi
#
# Check: destination exists?
#
( pcmd cd "${ddir}" ) || _exit_err "Cannot change to ${ddir}. Skipping."
#
# Check: incomplete backups? (needs echo to remove newlines)
#
# *.marker: not possible, creates an error, if no *.marker exists
# -> catch return value
pcmd ls -d1 "${ddir}/"*"${CMARKER}" > "${TMP}" 2>/dev/null; ret=$?
if [ "${ret}" -eq 0 ]; then
_techo "Incomplete backups: $(echo $(cat "${TMP}"))"
if [ -f "${c_delete_incomplete}" ]; then
delete_from_file "${TMP}" "${CMARKER}"
fi
fi
#
# Interval definition: First try source specific, fallback to default
#
c_interval="$(cat "${backup}/intervals/${INTERVAL}" 2>/dev/null)"
if [ -z "${c_interval}" ]; then
c_interval="$(cat "${CDEFAULTS}/intervals/${INTERVAL}" 2>/dev/null)"
if [ -z "${c_interval}" ]; then
_exit_err "No definition for interval \"${INTERVAL}\" found. Skipping."
fi
fi
#
# Check: maximum number of backups is reached?
#
count="$(pcmd ls -d1 "${ddir}/${INTERVAL}."*"/" | wc -l \
| sed 's/^ *//g')" || _exit_err "Counting backups failed"
_techo "Existing backups: ${count} Total keeping backups: ${c_interval}"
if [ "${count}" -ge "${c_interval}" ]; then
substract="$((${c_interval} - 1))"
remove="$((${count} - ${substract}))"
_techo "Removing ${remove} backup(s)..."
pcmd ls -${TSORT}d1r "${ddir}/${INTERVAL}."*"/" |
head -n "${remove}" > "${TMP}" || \
_exit_err "Listing old backups failed"
delete_from_file "${TMP}"
fi
#
# Check for backup directory to clone from: Always clone from the latest one!
#
last_dir="$(pcmd ls -${TSORT}p1 "${ddir}" | 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 ${last_dir}"
fi
# set time when we really begin to backup, not when we began to remove above
export destination_name="${INTERVAL}.$(${CDATE}).$$"
export destination_dir="${ddir}/${destination_name}"
export destination_full="${destination}/${destination_name}"
# give some info
_techo "Beginning to backup, this may take some time..."
_techo "Creating ${destination_dir} ..."
[ "${VVERBOSE}" ] && echo "mkdir ${destination_dir}"
pcmd mkdir "${destination_dir}" || \
_exit_err "Creating ${destination_dir} failed. Skipping."
#
# added marking in 0.6 (and remove it, if successful later)
#
pcmd touch "${destination_dir}${CMARKER}"
#
# the rsync part
#
_techo "Transferring files..."
rsync "$@" "${source}" "${destination_full}"; ret=$?
_techo "Finished backup (rsync return code: $ret)."
#
# Set modification time (mtime) to current time, if sorting by mtime is enabled
#
[ -f "$c_mtime" ] && pcmd 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
pcmd 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 "${c_post_exec} failed."
fi
fi
# Calculation
end_s="$(${SDATE})"
full_seconds="$((${end_s} - ${begin_s}))"
hours="$((${full_seconds} / 3600))"
seconds="$((${full_seconds} - (${hours} * 3600)))"
minutes="$((${seconds} / 60))"
seconds="$((${seconds} - (${minutes} * 60)))"
_techo "Backup lasted: ${hours}:${minutes}:${seconds} (h:m:s)"
) | add_name
done
#
# Be a good parent and wait for our children, if they are running wild parallel
#
if [ "${PARALLEL}" ]; then
_techo "Waiting for children to complete..."
wait
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"
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