#!/usr/bin/env bash
#
# $Id$
#
# mirror script for Isabelle distribution or website
## diagnostics
PRG=`basename "$0"`
usage()
{
echo
echo "Usage: $PRG [OPTIONS] DEST"
echo
echo " Options are:"
echo " -h print help message"
echo " -n dry run, don't do anything, just report what would happen"
echo " -w (ignored for backward compatibility)"
echo " -d delete files that are not on the server (BEWARE!)"
echo
exit 1
}
fail()
{
echo "$1" >&2
exit 2
}
## process command line
# options
HELP=""
ARGS=""
SRC="isabelle-website"
while getopts "hnwd" OPT
do
case "$OPT" in
h)
HELP=true
;;
n)
ARGS="$ARGS -n"
;;
w)
echo "option -w ignored"
;;
d)
ARGS="$ARGS --delete"
;;
\?)
usage
;;
esac
done
shift `expr $OPTIND - 1`
# help
if [ -n "$HELP" ]; then
cat <<EOF
Mirroring the Isabelle distribution or website
==============================================
The Munich site maintains an rsync server for the Isabelle
distribution or website.
The rsync tool is very smart and efficient in mirroring large
directory hierarchies. See http://rsync.samba.org/ for more
information. The $PRG script provides a simple front-end
for easy access to the Isabelle distribution.
The script can be either run in conservative or clean-sweep mode.
1) Basic mirroring works like this:
$PRG /foo/bar
where /foo/bar refers to your local copy of the Isabelle distribution
(the base directory has to exist already). This operation is
conservative in the sense that files are never deleted, thus garbage
may accumulate over time as our master copy is changed.
Avoiding garbage in your local copy requires some care. Rsync
provides a way to delete all additional local files that are absent in
the master copy. This provides an efficient way to purge large
directory hierarchies, even unwillingly in case that a wrong
destination is given!
2a) This will invoke a safe dry-run of clean-sweep mirroring:
$PRG -dn /foo/bar
where additions and deletions will be printed without any actual
changes performed so far.
2b) Exact mirroring with actual deletion of garbage may be performed
like this:
$PRG -d /foo/bar
After gaining some confidence in the workings of $PRG one
would usually set up some automatic mirror scheme, e.g. a daily cron
job run by the 'nobody' user.
Add -w to the option list in order to mirror the whole Isabelle website
EOF
exit 0
fi
# arguments
[ $# -ne 1 ] && { echo "Bad arguments: $*"; usage; }
DEST="$1"; shift;
## main
exec rsync -va $ARGS "rsync://isabelle.in.tum.de/$SRC" "$DEST/"