#!/bin/sh
#******************************************************************
#ident mirror Time-stamp: <97/09/29 13:28:44 bav>
#******************************************************************
#                           Gerd Bavendiek  bav@rw.sni.de  97-09-04
#
# Usage: mirror [-f|-verify|-floppy]
#
# This script tries to mirror the current working directory  on the
# node "mirror". It will copy all files via rdist(1). This way a true
# mirror of the current directory and its subdirectories is created.
#
# A remark for those, wo are not familiar with rdist(1):
# In subsequent calls to the script only files, that do not exist on
# node "mirror", will be copied.
#
# Files on "mirror", which are younger than on the actual node, will
# be mentioned but remain untouched (rdist option younger)
#
# Remarks:
# You will need an entry "mirror" in your /etc/hosts.
# The files "distfile" and "Distfile" have special meaning to
# rdist. If such a file is found, mirror exits immediatly.
# Emacs-Backup-Files (except-pattern *~$) will not be mirrored. Watch
# quoting in the here-document.
#
# Options:
#
# -f		will force removing of files on "mirror", which are 
# 		not on this side - this is somewhat dangerous.
# -verify	just watch what would be done.
#
# Finally:
# I sometimes want to do a quick backup of a directory using a floppy with
# an ext2-Filesystem. Here cp -urvp can be used. The disadvantage of
# this is handling of insufficient space on the floppy. Furthermore 
# the rdist's -f option cannot be used with cp. That's why I say:
#
# -floppy	Haven't finished this one. Ideas welcome. Use only, if
# 		you are knowing, what you do ...
#------------------------------------------------------------------
if [ -r Distfile -o -r distfile ]; then
   echo "[dD]istfile found - no action !"
   exit 0
fi

if [ -r .distfile ]; then
   rdist -f .distfile # Gerd's special - just for personal use
   exit $?
fi

# Force ! Remove files on "mirror", which can not be found on this
# side ! Remember: there is no "unremove" in Linux ;-)
if [ "$1" = "-f" ]; then
   rdist  -d PWD=`pwd` -f - << EOF
${PWD} -> mirror
	install -oyounger,remove ${PWD};
        except_pat ( ~\\$ );
EOF
# Do nothing, just watch what would be done.
elif [ "$1" = "-verify" ]; then
   rdist  -d PWD=`pwd` -f - << EOF
${PWD} -> mirror
	install -oyounger,verify ${PWD};
        except_pat ( ~\\$ );

EOF
elif [ "$1" = "-floppy" ]; then
# Mount floppy. Don't give up, if it's already mounted. Rely on
   # RetCode 3 in this case ! You will need something like the following
   # in your /etc/fstab:
   # /dev/fd0	        /floppy		ext2	user	    0	    0
   mount /floppy || if [ $? -ne 3 ]; then echo "$0: mount /floppy failed !"; exit 1; fi
   # If the mount hasn't succeded, don't panic: cp will totally break.
   # The options: r recursive (subdir's yes), u update (copy only if
   # file on /floppy is older), v verbose (tell me what you are
   # doing), p preserve (preserve timestamps)
   # Copying . really isn't cool.

   if [ "$2" != "-nodescend" ]; then	
      DIRSIZE=`du -s . | cut -f1`	
      CP_OPTIONS="-ruvp ."
   else
      # Shudder ! Really ugly ! Just a personal hack ! Will not handle dot-files !
      DIRSIZE=`du --total -s \`find . -type f -print -maxdepth 1\` | grep total | cut -f1`
      CP_OPTIONS="-uvp *"
   fi

   FLOPPYSIZE=`df -k /floppy | awk 'NR==2 {print $2}'`
   if [ `expr $FLOPPYSIZE \<\= $DIRSIZE` -eq 1 ]; then
      echo "Insufficient space: Files will not fit on /floppy ($DIRSIZE kB needed, $FLOPPYSIZE kB avail)" 
      echo "$0: exiting without copying anything !"
   else	
      cp $CP_OPTIONS /floppy
   fi
   umount /floppy || echo "$0: umount /floppy failed !"; exit 1
else
   rdist  -d PWD=`pwd` -f - << EOF
${PWD} -> mirror
	install -oyounger ${PWD};
        except_pat ( ~\\$ );
EOF
fi