switch-to-version.sh
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	#!/bin/bash
	#
	# Usage:
	# switch_to_version ContribName Version
	#
	# switch the given contrib to the given version.
	#
	# In both cases, if the version is "trunk", we give it a svn_write
	# access; otherwise, we use a read-only (http) access.

	# load some common utilities
	. `dirname $0`/common.sh

	# make sure a contrib is specified
	contrib=${1%/}
	if [[ -z "$contrib" ]]; then
	echo "A contrib name has to be specified"
	exit 1
	fi

	# decide wich version number to use
	version=$2
	if [[ -z "$version" ]]; then
	# get the version from the svn list
	get_contrib_version $contrib contribs.svn version_svn
	if [[ "$version_svn" == "[None]" ]]; then
	echo "$contrib is not listed in the svn-supported list of contribs (contribs.svn)."
	echo "You have to specify the version yourself."
	if [ ! -z "`svn ls $svn_read/contribs \| grep '^'$contrib'/$'`" ]; then
	echo "Possible tagged (released) versions are:"
	svn ls $svn_read/contribs/$contrib/tags \| sed 's/\/$//g;s/^/ tags\//g'
	fi
	exit 1
	fi
	echo " Using version $version_svn"
	version=$version_svn
	fi

	# decide which access mode we want
	mode="ro"
	if [[ "$version" == "trunk" ]]; then
	mode="rw"
	fi
	if [[ "${version}" =~ ^branches ]]; then
	mode="rw"
	fi

	# if the version starts with a number, prefix it by "tags/"
	if [[ "$version" =~ ^[0-9] ]]; then
	version="tags/$version"
	fi

	# get the current situation
	get_svn_info $contrib current_mode current_version
	if [[ "$version" == "$current_version" ]]; then
	if [[ "$mode" == "$current_mode" ]]; then
	if [[ "$version" != "["*"]" ]]; then
	echo " Already at the requested version. Simply running svn up"
	cd $contrib
	svn up
	cd ..
	else
	echo " Already at the requested version."
	fi
	exit 0
	fi
	fi

	# make sure that the version exists
	if [ -z "`svn ls $svn_read/contribs \| grep '^'$contrib'/$'`" ]; then
	echo "${contrib} does not appear to be a valid contrib in the svn repository"
	exit 1
	fi
	if [[ "${version}" != "trunk" ]]; then
	# check if we're requesting a tag or a branch
	if [[ "$version" =~ ^branches ]]; then
	# we deal with a branch
	branch_version=${version#*/}
	if [ -z "`svn ls $svn_read/contribs/$contrib/branches \| grep '^'$branch_version'/$'`" ]; then
	echo "Version $version of $contrib does not exist. Exiting."
	exit 1
	fi
	else
	# we deal with a tag
	tagged_version=${version#*/}
	if [ -z "`svn ls $svn_read/contribs/$contrib/tags \| grep '^'$tagged_version'/$'`" ]; then
	echo "Version $version of $contrib does not exist. Exiting."
	exit 1
	fi
	fi
	fi


	# if the directory does not yet exist, check it out
	if [[ "$current_version" == "[None]" ]]; then
	echo " Checking out version ${version} of ${contrib}"
	if [[ "${mode}" == "rw" ]]; then
	svn co ${svn_write}/contribs/${contrib}/${version} $contrib
	else
	svn co ${svn_read}/contribs/${contrib}/${version} $contrib
	fi
	exit 0
	fi

	# if the directory exists but is not on svn, print an error
	# TODO: allow to overwrite your local copy
	if [[ "$current_version" == "[NoSVN]" ]]; then
	echo "You appear to have an unversionned copy of ${contrib}."
	echo "Please move it out of the way before updating ${contrib} to a versioned version."
	exit 1
	fi

	# check that there is no pending
	check_pending_modifications $contrib \|\| {
	get_yesno_answer "Your local copy has modifications. Do you want to proceed with the update?" && {
	echo "Aborting."
	exit 1
	}
	}

	# move to the contrib's directory
	cd $contrib

	# in principle, we should use an "svn switch" here (change
	# a directory in a given repos). But that does not allow
	# to change the access type. So if the access type
	# changes, we combine that with a svn relocate
	#
	# Options include:
	# - a version upgrade: svn switch
	# - trunk->stable: svn relocate + svn switch
	# - stable->trunk: svn switch + svn relocate
	# Se we need to check if we are currently using a svn+ssh
	# or http access

	# if we're coming from the trunk, first switch to a read-only access
	if [[ "$current_mode" == "rw" ]]; then
	echo " (first changing the access-mode to read-only)"
	svn switch --relocate ${svn_write}/contribs/$contrib/${current_version} ${svn_read}/contribs/$contrib/${current_version}
	svn up
	fi

	# now switch to the correct location
	svn switch ${svn_read}/contribs/$contrib/$version
	# grant write access when needed
	if [[ "${mode}" == "rw" ]]; then
	svn switch --relocate ${svn_read}/contribs/$contrib/${version} ${svn_write}/contribs/$contrib/${version}
	svn up
	fi

	cd ..

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