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|
#! /bin/sh
# @(#)util/savelog.sh 1.4 26 Oct 1991 22:49:39
#
# savelog - save a log file
#
# Copyright (C) 1987, 1988 Ronald S. Karr and Landon Curt Noll
#
# See the file COPYING, distributed with smail, for restriction
# and warranty information.
#
# usage: savelog [-m mode] [-u user] [-g group] [-t] [-c cycle] [-l] file...
#
# -m mode - chmod log files to mode
# -u user - chown log files to user
# -g group - chgrp log files to group
# -c cycle - save cycle versions of the logfile (default: 7)
# -t - touch file
# -l - don't compress any log files (default: compress)
# file - log file names
#
# The savelog command saves and optionally compresses old copies of files
# into an 'dir'/OLD sub-directory. The 'dir' directory is determined from
# the directory of each 'file'.
#
# Older version of 'file' are named:
#
# OLD/'file'.<number><compress_suffix>
#
# where <number> is the version number, 0 being the newest. By default,
# version numbers > 0 are compressed (unless -l prevents it). The
# version number 0 is never compressed on the off chance that a process
# still has 'file' opened for I/O.
#
# If the 'file' does not exist or if it is zero length, no further processing
# is performed. However if -t was also given, it will be created.
#
# For files that do exist and have lengths greater than zero, the following
# actions are performed.
#
# 1) Version numered files are cycled. That is version 6 is moved to
# version 7, version is moved to becomes version 6, ... and finally
# version 0 is moved to version 1. Both compressed names and
# uncompressed names are cycled, regardless of -t. Missing version
# files are ignored.
#
# 2) The new OLD/file.1 is compressed and is changed subject to
# the -m, -u and -g flags. This step is skipped if the -t flag
# was given.
#
# 3) The main file is moved to OLD/file.0.
#
# 4) If the -m, -u, -g or -t flags are given, then file is created
# (as an empty file) subject to the given flags.
#
# 5) The new OLD/file.0 is chanegd subject to the -m, -u and -g flags.
#
# Note: If the OLD sub-directory does not exist, it will be created
# with mode 0755.
#
# Note: If no -m, -u or -g flag is given, then the primary log file is
# not created.
#
# Note: Since the version numbers start with 0, version number <cycle>
# is never formed. The <cycle> count must be at least 2.
#
# Bugs: If a process is still writing to the file.0 and savelog
# moved it to file.1 and compresses it, data could be lost.
# Smail does not have this problem in general because it
# restats files often.
# common location
PATH="X_UTIL_PATH_X:X_SECURE_PATH_X"; export PATH
COMPRESS="X_COMPRESS_X"
COMP_FLAG="X_COMP_FLAG_X"
DOT_Z="X_DOT_Z_X"
CHOWN="X_CHOWN_X"
GETOPT="X_UTIL_BIN_DIR_X/getopt"
# parse args
exitcode=0 # no problems to far
prog=$0
mode=
user=
group=
touch=
count=7
set -- `$GETOPT m:u:g:c:lt $*`
if [ $# -eq 0 -o $? -ne 0 ]; then
echo "usage: $prog [-m mode][-u user][-g group][-t][-c cycle][-l] file ..." 1>&2
exit 1
fi
for i in $*; do
case $i in
-m) mode=$2; shift 2;;
-u) user=$2; shift 2;;
-g) group=$2; shift 2;;
-c) count=$2; shift 2;;
-t) touch=1; shift;;
-l) COMPRESS=""; shift;;
--) shift; break;;
esac
done
if [ "$count" -lt 2 ]; then
echo "$prog: count must be at least 2" 1>&2
exit 2
fi
# cycle thru filenames
while [ $# -gt 0 ]; do
# get the filename
filename=$1
shift
# catch bogus files
if [ -b "$filename" -o -c "$filename" -o -d "$filename" ]; then
echo "$prog: $filename is not a regular file" 1>&2
exitcode=3
continue
fi
# if not a file or empty, do nothing major
if [ ! -s $filename ]; then
# if -t was given and it does not exist, create it
if [ ! -z "$touch" -a ! -f $filename ]; then
touch $filename
if [ "$?" -ne 0 ]; then
echo "$prog: could not touch $filename" 1>&2
exitcode=4
continue
fi
if [ ! -z "$user" ]; then
$CHOWN $user $filename
fi
if [ ! -z "$group" ]; then
chgrp $group $filename
fi
if [ ! -z "$mode" ]; then
chmod $mode $filename
fi
fi
continue
fi
# be sure that the savedir exists and is writable
savedir=`expr "$filename" : '\(.*\)/'`
if [ -z "$savedir" ]; then
savedir=./OLD
else
savedir=$savedir/OLD
fi
if [ ! -s $savedir ]; then
mkdir $savedir
if [ "$?" -ne 0 ]; then
echo "$prog: could not mkdir $savedir" 1>&2
exitcode=5
continue
fi
chmod 0755 $savedir
fi
if [ ! -d $savedir ]; then
echo "$prog: $savedir is not a directory" 1>&2
exitcode=6
continue
fi
if [ ! -w $savedir ]; then
echo "$prog: directory $savedir is not writable" 1>&2
exitcode=7
continue
fi
# deterine our uncompressed file names
newname=`expr "$filename" : '.*/\(.*\)'`
if [ -z "$newname" ]; then
newname=$savedir/$filename
else
newname=$savedir/$newname
fi
# cycle the old compressed log files
cycle=`expr $count - 1`
rm -f $newname.$cycle $newname.$cycle$DOT_Z
while [ "$cycle" -gt 1 ]; do
# --cycle
oldcycle=$cycle
cycle=`expr $cycle - 1`
# cycle log
if [ -f $newname.$cycle$DOT_Z ]; then
mv -f $newname.$cycle$DOT_Z $newname.$oldcycle$DOT_Z
fi
if [ -f $newname.$cycle ]; then
# file was not compressed for some reason move it anyway
mv -f $newname.$cycle $newname.$oldcycle
fi
done
# compress the old uncompressed log if needed
if [ -f $newname.0 ]; then
if [ -z "$COMPRESS" ]; then
newfile=$newname.1
mv $newname.0 $newfile
else
newfile=$newname.1$DOT_Z
$COMPRESS $COMP_FLAG < $newname.0 > $newfile
rm -f $newname.0
fi
if [ ! -z "$user" ]; then
$CHOWN $user $newfile
fi
if [ ! -z "$group" ]; then
chgrp $group $newfile
fi
if [ ! -z "$mode" ]; then
chmod $mode $newfile
fi
fi
# move the file into the file.0 holding place
mv -f $filename $newname.0
# replace file if needed
if [ ! -z "$touch" -o ! -z "$user" -o \
! -z "$group" -o ! -z "$mode" ]; then
touch $filename
fi
if [ ! -z "$user" ]; then
$CHOWN $user $filename
fi
if [ ! -z "$group" ]; then
chgrp $group $filename
fi
if [ ! -z "$mode" ]; then
chmod $mode $filename
fi
# fix the permissions on the holding place file.0 file
if [ ! -z "$user" ]; then
$CHOWN $user $newname.0
fi
if [ ! -z "$group" ]; then
chgrp $group $newname.0
fi
if [ ! -z "$mode" ]; then
chmod $mode $newname.0
fi
done
exit $exitcode
|
