src/src/exicyclog.src

   1 #! /bin/sh
   2 # $Cambridge: exim/src/src/exicyclog.src,v 1.11 2009/11/16 19:50:36 nm4 Exp $
   3
   4 # Copyright (c) University of Cambridge, 1995 - 2007
   5 # See the file NOTICE for conditions of use and distribution.
   6
   7 # This script takes the following command line arguments:
   8 # -l dir        Log file directory
   9 # -k days       Number of days to keep the log files
  10
  11 # Except when they appear in comments, the following placeholders in this
  12 # source are replaced when it is turned into a runnable script:
  13 #
  14 # CONFIGURE_FILE_USE_NODE
  15 # CONFIGURE_FILE_USE_EUID
  16 # CONFIGURE_FILE
  17 # BIN_DIRECTORY
  18 # EXICYCLOG_MAX
  19 # COMPRESS_COMMAND
  20 # COMPRESS_SUFFIX
  21 # CHOWN_COMMAND
  22 # CHGRP_COMMAND
  23 # CHMOD_COMMAND
  24 # TOUCH_COMMAND
  25 # MV_COMMAND
  26 # RM_COMMAND
  27
  28 # PROCESSED_FLAG
  29
  30 # This is a shell script for cycling exim main and reject log files. Each time
  31 # it is run, the files get "shuffled down" by one, the current one (e.g.
  32 # mainlog) becoming mainlog.01, the previous mainlog.01 becoming mainlog.02,
  33 # and so on, up to the limit configured here. When the number to keep is
  34 # greater than 99 (not common, but some people do it), three digits are used
  35 # (e.g. mainlog.001). The same shuffling happens to the reject logs. All
  36 # renamed files with numbers greater than 1 are compressed.
  37
  38 # This script should be called regularly (e.g. daily) by a root crontab
  39 # entry of the form
  40
  41 # 1 0 * * *   /opt/exim/bin/exicyclog
  42
  43 # The following lines are generated from Exim's configuration file when
  44 # this source is built into a script, but you can subsequently edit them
  45 # without rebuilding things, as long are you are careful not to overwrite
  46 # the script in the next Exim rebuild/install. "Keep" is the number of old log
  47 # files that are required to be kept. Its value can be overridden by the -k
  48 # command line option. "Compress" and "suffix" define your chosen compression
  49 # method. The others are provided because the location of certain commands
  50 # varies from OS to OS. Sigh.
  51
  52 keep=EXICYCLOG_MAX
  53 compress=COMPRESS_COMMAND
  54 suffix=COMPRESS_SUFFIX
  55
  56 chgrp=CHGRP_COMMAND
  57 chmod=CHMOD_COMMAND
  58 chown=CHOWN_COMMAND
  59 mv=MV_COMMAND
  60 rm=RM_COMMAND
  61 touch=TOUCH_COMMAND
  62
  63 # End of editable lines
  64 #########################################################################
  65
  66 # Sort out command line options.
  67
  68 while [ $# -gt 0 ] ; do
  69   case "$1" in
  70   -l) log_file_path=$2
  71       shift
  72       ;;
  73   -k) keep=$2
  74       shift
  75       ;;
  76    *) echo "** exicyclog: unknown option $1"
  77       exit 1
  78       ;;
  79    esac
  80    shift
  81 done
  82
  83 # Some operating systems have different versions in which the commands live
  84 # in different places. We have a fudge that will search the usual suspects if
  85 # requested.
  86
  87 for cmd in chgrp chmod chown mv rm touch; do
  88   eval "oldcmd=\$$cmd"
  89   if [ "$oldcmd" != "look_for_it" ] ; then continue ; fi
  90   newcmd=$cmd
  91   for dir in /bin /usr/bin /usr/sbin /usr/etc ; do
  92     if [ -f $dir/$cmd ] ; then
  93       newcmd=$dir/$cmd
  94       break
  95     fi
  96   done
  97   eval $cmd=$newcmd
  98 done
  99
 100 # See if this installation is using the esoteric "USE_EUID" feature of Exim,
 101 # in which it uses the effective user id as a suffix for the configuration file
 102 # name. In order for this to work, exicyclog must be run under the appropriate
 103 # euid.
 104
 105 if [ "CONFIGURE_FILE_USE_EUID" = "yes" ]; then
 106   euid=.`id -u`
 107 fi
 108
 109 # See if this installation is using the esoteric "USE_NODE" feature of Exim,
 110 # in which it uses the host's name as a suffix for the configuration file name.
 111
 112 if [ "CONFIGURE_FILE_USE_NODE" = "yes" ]; then
 113   hostsuffix=.`uname -n`
 114 fi
 115
 116 # Now find the configuration file name. This has got complicated because the
 117 # CONFIGURE_FILE value may now be a list of files. The one that is used is the
 118 # first one that exists. Mimic the code in readconf.c by testing first for the
 119 # suffixed file in each case.
 120
 121 set `awk -F: '{ for (i = 1; i <= NF; i++) print $i }' <<End
 122 CONFIGURE_FILE
 123 End
 124 `
 125 while [ "$config" = "" -a $# -gt 0 ] ; do
 126   if [ -f "$1$euid$hostsuffix" ] ; then
 127     config="$1$euid$hostsuffix"
 128   elif [ -f "$1$euid" ] ; then
 129     config="$1$euid"
 130   elif [ -f "$1$hostsuffix" ] ; then
 131     config="$1$hostsuffix"
 132   elif [ -f "$1" ] ; then
 133     config="$1"
 134   fi
 135   shift
 136 done
 137
 138 # Determine if the log file path is set, and where the spool directory is.
 139 # Search for an exim_path setting in the configure file; otherwise use the bin
 140 # directory. Call that version of Exim to find the spool directory and log file
 141 # path, unless log_file_path was set above by a command line option. BEWARE: a
 142 # tab character is needed in the command below. It has had a nasty tendency to
 143 # get lost in the past. Use a variable to hold a space and a tab to keep the
 144 # tab in one place.
 145
 146 st='     '
 147 exim_path=`grep "^[$st]*exim_path" $config | sed "s/.*=[$st]*//"`
 148 if test "$exim_path" = ""; then exim_path=BIN_DIRECTORY/exim; fi
 149
 150 spool_directory=`$exim_path -C $config -bP spool_directory | sed 's/.*=[  ]*//'`
 151
 152 if [ "$log_file_path" = "" ] ; then
 153   log_file_path=`$exim_path -C $config -bP log_file_path | sed 's/.*=[  ]*//'`
 154 fi
 155
 156 # If log_file_path contains only "syslog" then no Exim log files are in use.
 157 # We can't cycle anything. Complain and give up.
 158
 159 if [ "$log_file_path" = "syslog" ] ; then
 160   echo "*** Exim is logging to syslog - no log files to cycle ***"
 161   exit 1
 162 fi
 163
 164 # Otherwise, remove ":syslog" or "syslog:" (some spaces allowed) and inspect
 165 # what remains. The simplistic regex originally used failed when a filename
 166 # contained "syslog", so we have to use three less general ones, because sed
 167 # doesn't have much power in its regexs.
 168
 169 log_file_path=`echo "$log_file_path" | \
 170   sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 171
 172 # If log_file_path is empty, try and get the compiled in default by using
 173 # /dev/null as the configuration file.
 174
 175 if [ "$log_file_path" = "" ]; then
 176   log_file_path=`$exim_path -C /dev/null -bP log_file_path | sed 's/.*=[  ]*//'`
 177   log_file_path=`echo "$log_file_path" | \
 178     sed 's/^ *:\{0,1\} *syslog *:\{0,1\} *//;s/: *syslog *:/:/;s/: *syslog *$//'`
 179 fi
 180
 181 # If log_file_path is still empty, the logs we are interested in are probably
 182 # called "mainlog" and "rejectlog" in the directory called "log" in the spool
 183 # directory. Otherwise we fish out the directory from the given path, and also
 184 # the names of the logs.
 185
 186 if [ "$log_file_path" = "" ]; then
 187   logdir=$spool_directory/log
 188   mainlog=mainlog
 189   rejectlog=rejectlog
 190   paniclog=paniclog
 191 else
 192   logdir=`echo $log_file_path | sed 's?/[^/]*$??'`
 193   logbase=`echo $log_file_path | sed 's?^.*/??'`
 194   mainlog=`echo $logbase | sed 's/%s/main/'`
 195   rejectlog=`echo $logbase | sed 's/%s/reject/'`
 196   paniclog=`echo $logbase | sed 's/%s/panic/'`
 197 fi
 198
 199 # Get into the log directory to do the business.
 200
 201 cd $logdir || exit 1
 202
 203 # If there is no main log file, do nothing.
 204
 205 if [ ! -f $mainlog ]; then exit; fi
 206
 207 # Find out the owner and group of the main log file so that we can re-instate
 208 # this on moved and compressed files, since some operating systems may change
 209 # things. This is a tedious bit of code, but it should work both in operating
 210 # systems where the -l option of ls gives the user and group, and those in which
 211 # you need -lg. The condition is that, if the fifth field of the output from
 212 # ls consists entirely of digits, then the third and fourth fields are the user
 213 # and group.
 214
 215 a=`ls -lg $mainlog`
 216 b=`ls -l  $mainlog`
 217
 218 # These statements work fine in the Bourne or Korn shells, but not in Bash.
 219 # So for the benefit of systems whose /bin/sh is really Bash, they have been
 220 # changed to a messier form.
 221
 222 # user=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $3; }'`
 223 # group=`echo "$a\n$b\n" | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) print $4; }'`
 224
 225 user=`echo "$a
 226 $b
 227 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $3; exit; } }'`
 228
 229 group=`echo "$a
 230 $b
 231 " | awk 'BEGIN { OFS=""} { if ($5 ~ /^[0-9]+$/) { print $4; exit; } }'`
 232
 233 # Now do the job. First remove the files that have "fallen off the bottom".
 234 # Look for both the compressed and uncompressed forms.
 235
 236 if [ $keep -lt 10 ]; then keept=0$keep; else keept=$keep; fi;
 237
 238 if [ -f $mainlog.$keept ]; then $rm $mainlog.$keept; fi;
 239 if [ -f $mainlog.$keept.$suffix ]; then $rm $mainlog.$keept.$suffix; fi;
 240
 241 if [ -f $rejectlog.$keept ]; then $rm $rejectlog.$keept; fi;
 242 if [ -f $rejectlog.$keept.$suffix ]; then $rm $rejectlog.$keept.$suffix; fi;
 243
 244 if [ -f $paniclog.$keept ]; then $rm $paniclog.$keept; fi;
 245 if [ -f $paniclog.$keept.$suffix ]; then $rm $paniclog.$keept.$suffix; fi;
 246
 247 # Now rename all the previous old files by increasing their numbers by 1.
 248 # When the number is less than 10, insert a leading zero.
 249
 250 count=$keep
 251 if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 252
 253 while [ $count -gt 1 ]; do
 254   old=`expr -- $count - 1`
 255   if [ $keep -gt 99 ]; then
 256     if   [ $old -lt 10 ]; then oldt=00$old
 257     elif [ $old -lt 100 ]; then oldt=0$old
 258     else oldt=$old
 259     fi
 260   else
 261     if [ $old -lt 10 ]; then oldt=0$old; else oldt=$old; fi;
 262   fi
 263   if [ -f $mainlog.$oldt ]; then
 264     $mv $mainlog.$oldt $mainlog.$countt
 265   elif [ -f $mainlog.$oldt.$suffix ]; then
 266     $mv $mainlog.$oldt.$suffix $mainlog.$countt.$suffix
 267   fi
 268   if [ -f $rejectlog.$oldt ]; then
 269     $mv $rejectlog.$oldt $rejectlog.$countt
 270   elif [ -f $rejectlog.$oldt.$suffix ]; then
 271     $mv $rejectlog.$oldt.$suffix $rejectlog.$countt.$suffix
 272   fi
 273   if [ -f $paniclog.$oldt ]; then
 274     $mv $paniclog.$oldt $paniclog.$countt
 275   elif [ -f $paniclog.$oldt.$suffix ]; then
 276     $mv $paniclog.$oldt.$suffix $paniclog.$countt.$suffix
 277   fi
 278   count=$old
 279   countt=$oldt
 280 done
 281
 282 # Now rename the current files as 01 or 001 if keeping more than 99
 283
 284 if [ $keep -gt 99 ]; then first=001; else first=01; fi
 285
 286 if [ -f $mainlog ]; then
 287   $mv $mainlog $mainlog.$first
 288   $chown $user:$group $mainlog.$first
 289   $touch $mainlog
 290   $chown $user:$group $mainlog
 291   $chmod 640 $mainlog
 292 fi
 293
 294 if [ -f $rejectlog ]; then
 295   $mv $rejectlog $rejectlog.$first
 296   $chown $user:$group $rejectlog.$first
 297   $touch $rejectlog
 298   $chown $user:$group $rejectlog
 299   $chmod 640 $rejectlog
 300 fi
 301
 302 if [ -f $paniclog ]; then
 303   $mv $paniclog $paniclog.$first
 304   $chown $user:$group $paniclog.$first
 305   $touch $paniclog
 306   $chown $user:$group $paniclog
 307   $chmod 640 $paniclog
 308 fi
 309
 310 # Now scan the (0)02 and later files, compressing where necessary, and
 311 # ensuring that their owners and groups are correct.
 312
 313 count=2;
 314
 315 while [ $count -le $keep ]; do
 316   if [ $keep -gt 99 ]; then
 317     if   [ $count -lt 10 ]; then countt=00$count
 318     elif [ $count -lt 100 ]; then countt=0$count
 319     else countt=$count
 320     fi
 321   else
 322     if [ $count -lt 10 ]; then countt=0$count; else countt=$count; fi
 323   fi
 324   if [ -f $mainlog.$countt ]; then $compress $mainlog.$countt; fi
 325   if [ -f $mainlog.$countt.$suffix ]; then
 326     $chown $user:$group $mainlog.$countt.$suffix
 327   fi
 328   if [ -f $rejectlog.$countt ]; then $compress $rejectlog.$countt; fi
 329   if [ -f $rejectlog.$countt.$suffix ]; then
 330     $chown $user:$group $rejectlog.$countt.$suffix
 331   fi
 332   if [ -f $paniclog.$countt ]; then $compress $paniclog.$countt; fi
 333   if [ -f $paniclog.$countt.$suffix ]; then
 334     $chown $user:$group $paniclog.$countt.$suffix
 335   fi
 336
 337   count=`expr -- $count + 1`
 338 done
 339
 340 # End of exicyclog